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Article ; Online: Facile synthesis of platinum/polypyrrole-carbon black/SnS2 nanocomposite for efficient photocatalytic removal of gemifloxacin under visible light

M. Faisal / Jahir Ahmed / Jari S. Algethami / Ali S. Alkorbi / Farid A. Harraz

Journal of Saudi Chemical Society, Vol 28, Iss 2, Pp 101806- (2024)

2024

Abstract: Development and designing of effective visible light photocatalysts to overcome the drastrous situation of water pollution requires material with excellent charge transferring skills. In this regard, an efficient ternary nanocomposite photocatalyst ... ...

Abstract	Development and designing of effective visible light photocatalysts to overcome the drastrous situation of water pollution requires material with excellent charge transferring skills. In this regard, an efficient ternary nanocomposite photocatalyst comprised of SnS2 nanostructure linked with polypyrrole-doped carbon black (PPC) and platinum nanoparticles (Pt NPs) was successfully fabricated. Effective ternary photocatalyst was synthesized by hydrothermal technique followed by ultra-sonication and photo-reduction methodologies. The XRD measurements confirmed the hexagonal phase of SnS2, and the proper formation of nanocomposite. TEM examination revealed Pt NPs of 5–15 nm in size, dense cocoon like layered structure of PPC along with irregular pellets of SnS2. Acquired diffuse reflectance data confirmed the visible light band gap of synthesized nanomaterials. The Pt@PPC/SnS2 photocatalyst showed excellent destructive potential under visible light with 92.40 % removal of antibiotic gemifloxacin (GFX) in 30 minutes, almost 347 % more efficient than bare SnS2, and was found to be ultrafast for the removal of methylene blue (MB) with total elimination of dye just in 10 minutes. The photoluminescence and photocurrent transient analysis revealed enhanced light absorption capability and increased photo-induced carrier transfer with effective separation behavior, together with increased effective surface area of the ternary photocatalyst as evidenced by the BET surface area measurement.
Keywords	SnS2 ; Photocatalyst ; PtNPs ; Hydrothermal ; Photoreduction ; Gemifloxacin ; Chemistry ; QD1-999
Language	English
Publishing date	2024-03-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Au nanoparticles dispersed polypyrrole-carbon black/SrTiO3 nanocomposite photocatalyst with rapid and stable photocatalytic performance

M. Faisal / Jari S. Algethami / Ali Q. Alorabi / Jahir Ahmed / Farid A. Harraz

Journal of Saudi Chemical Society, Vol 27, Iss 6, Pp 101741- (2023)

2023

Abstract: The current chaotic environmental situation especially water pollution prerequisites efficient novel photocatalysts for the proper treatment of these toxic structures through advanced oxidation process. However, the development of active photocatalytic ... ...

Abstract	The current chaotic environmental situation especially water pollution prerequisites efficient novel photocatalysts for the proper treatment of these toxic structures through advanced oxidation process. However, the development of active photocatalytic structures requires further committed effort to ensure proper designing and essential band gap. In this report, an attempt has been made to fabricate a rapid and efficient photocatalyst based on SrTiO3 nanostructures, polypyrrole doped carbon black (PPyC) and Au nanoparticles to tackle serious problems of water contamination. Au@PPyC/SrTiO3 ternary photocatalyst was smoothly fabricated by sol gel route followed by ultrasonication and photoreduction technique. X-ray powder diffraction (XRD) studies revealed that SrTiO3 have cubic perovskite structure, while X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) confirmed the formation of ternary framework among Au, PPyC and SrTiO3 nanostructures. Transmission electron microscopy (TEM) revealed that SrTiO3 possessed irregular porous nanoparticles ranging from 10 to 100 nm, whereas the PPyC appeared as well-ordered chain of beads or interconnected branches of nanoparticles. Modification of bare SrTiO3 to Au@PPyC/SrTiO3 significantly increases the surface area to 2.48 times than that of SrTiO3. The photocatalytic performance of the newly developed Au@PPyC/SrTiO3 photocatalyst has been tested on insecticide imidacloprid and on methylene blue (MB) dye. The current Au@PPyC/SrTiO3 photocatalytic framework exhibited ultrafast skills by removing 96.65% of imidacloprid just in 15 min and found to be ∼3.5 times more effective than bare SrTiO3. Besides this Au@PPyC/SrTiO3 photocatalyst was proven to be extremely destructive for resistant MB dye structure.
Keywords	SrTiO3 ; Polypyrrole-carbon ; Au NPs ; Photo-reduction ; Insecticide ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2023-11-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Comprehensive Analysis of Spinel-Type Mixed Metal Oxide-Functionalized Polysulfone Membranes toward Fouling Resistance and Dye and Natural Organic Matter Removal

Lavanya Chandra / Mohammed Jalalah / Mabkhoot Alsaiari / R. Geetha Balakrishna / Farid A. Harraz

ACS Omega, Vol 7, Iss 6, Pp 4859-

2022 Volume 4867

Keywords	Chemistry ; QD1-999
Language	English
Publishing date	2022-02-01T00:00:00Z
Publisher	American Chemical Society
Document type	Article ; Online
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Article ; Online: Immersion-plated palladium nanoparticles onto meso-porous silicon layer as novel SERS substrate for sensitive detection of imidacloprid pesticide

A. M. Al-Syadi / M. Faisal / Farid A. Harraz / Mohammed Jalalah / Mabkhoot Alsaiari

Scientific Reports, Vol 11, Iss 1, Pp 1-

2021 Volume 14

Abstract: Abstract Herein, we demonstrate the effectiveness of surface-enhanced Raman scattering (SERS) to detect trace concentration of potentially harmful imidacloprid pesticide. To achieve this ultimate objective, a rapid and highly effective methodology for ... ...

Abstract	Abstract Herein, we demonstrate the effectiveness of surface-enhanced Raman scattering (SERS) to detect trace concentration of potentially harmful imidacloprid pesticide. To achieve this ultimate objective, a rapid and highly effective methodology for the fabrication of active and stable porous silicon (PSi) plated palladium nanoparticles (PdNPs) SERS substrates by an electrochemical anodization and immersion plating routes was applied. The PSi layers were fabricated by the electrochemical anodization of a silicon wafer in ethanoic fluoride solution, followed by uniformly deposition of PdNPs via a simple immersion plating technique. The structural features and morphology of fabricated frameworks of PSi-Pd NPs have been investigated by field emission scanning electron microscopy (FE-SEM) with energy dispersive X-ray (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT-IR) spectra. The PSi substrate demonstrates a meso-porous morphology with good distribution, good pore density and average pore sizes around 20 nm. The SERS performance of Si–Pd NPs and PSi–Pd NPs substrates has been examined taking imidacloprid (an insecticide) as a target analyte. The SERS signal of imidacloprid using PSi–Pd NPs substrate exhibited immense enhancement compared to the Si-Pd NPs substrate. The active substrate revealed excellent detectable performance with a concentration as low as 10–9 M imidacloprid and an enhancement factor (EF) of 1.2 × 105. This large EF is fundamentally ascribed to the combined effect of the electromagnetic improvement and charge transfer mechanisms. Additionally, no aging effect was observed for the present substrates kept in air for two weeks. Striking enhancement in Raman spectral signals obtained with the current PSi–Pd NPs substrates can provide a simple and smooth platform towards the sensitive detection of various target analytes.
Keywords	Medicine ; R ; Science ; Q
Subject code	500
Language	English
Publishing date	2021-04-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Highly sensitive and selective amperometric hydrazine sensor based on Au nanoparticle-decorated conducting polythiophene prepared via oxidative polymerization and photo-reduction techniques

Md.A. Rashed / M. Faisal / Jahir Ahmed / S.A. Alsareii / Mohammed Jalalah / Farid A. Harraz

Journal of Saudi Chemical Society, Vol 26, Iss 3, Pp 101480- (2022)

2022

Abstract: In this study, gold nanoparticles (AuNPs) decorated polythiophene (Pth) nanocomposite modified glassy carbon electrode (GCE) has been used to fabricate an electrochemical sensor for the sensitive and selective detection of hydrazine. Transmission ... ...

Abstract	In this study, gold nanoparticles (AuNPs) decorated polythiophene (Pth) nanocomposite modified glassy carbon electrode (GCE) has been used to fabricate an electrochemical sensor for the sensitive and selective detection of hydrazine. Transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were used to adequately characterize the nanocomposite. The research findings revealed that AuNPs with cubic phase and diameter range 10–22 nm were monodispersed over the polymeric surface. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) investigation demonstrated that the AuNPs decorated Pth greatly improved the electrocatalytic performance compared with pure Pth modified GCE. This extraordinary electrochemical property is attributed to the synergistic coupling effect between AuNPs and Pth. The mechanistic analysis using CV voltammograms measured in varying scan rates revealed irreversible diffusion-controlled kinetics involving four-electron (4e−) transfer process of hydrazine oxidation. In amperometric (i-t) detection, the proposed sensor showed high sensitivity 0.1817 μAμMcm−2 and a low detection limit 0.77 μM (S/N = 3) over the concentration range 1–963 μM. Moreover, this proposed nanocomposite-based sensor was highly selective toward hydrazine in the presence of common interfering species, especially in high concentrations of sugars (e.g. glucose, sucrose, fructose, and galactose) and exhibited promising analytical results of recovery tests in water samples with acceptable recovery with a relative standard deviation less than 5%.
Keywords	AuNPs ; Polythiophene ; Hydrazine sensor ; Amperometry ; Selectivity ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Facile Synthesis of Low-Cost Copper-Silver and Cobalt-Silver Alloy Nanoparticles on Reduced Graphene Oxide as Efficient Electrocatalysts for Oxygen Reduction Reaction in Alkaline Media

Jadranka Milikić / Sara Knežević / Stevan Stojadinović / Mabkhoot Alsaiari / Farid A. Harraz / Diogo M. F. Santos / Biljana Šljukić

Nanomaterials, Vol 12, Iss 2657, p

2022 Volume 2657

Abstract: Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in ... ...

Abstract	Copper-silver and cobalt-silver alloy nanoparticles deposited on reduced graphene oxide (CuAg/rGO and CoAg/rGO) were synthesized and examined as electrocatalysts for oxygen reduction reaction (ORR) and hydrogen peroxide reduction reaction (HPRR) in alkaline media. Characterization of the prepared samples was done by transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy with integrated energy-dispersive X-ray spectroscopy (SEM-EDS). CuAg/rGO and CoAg/rGO nanoparticles diameter ranged from 0.4 to 9.2 nm. The Ag loading was ca. 40 wt.% for both electrocatalysts, with that for Cu and Co being 35 and 17 wt.%, respectively. CoAg/rGO electrocatalyst showed a Tafel slope of 109 mV dec −1 , significantly lower than that for CuAg/rGO (184 mV dec −1 ), suggesting faster ORR kinetics. Additionally, a higher diffusion current density was obtained for CoAg/rGO (−2.63 mA cm −2 ) than for CuAg/rGO (−1.74 mA cm −2 ). The average value of the number of electrons transferred during ORR was 2.8 for CuAg/rGO and 3.3 for CoAg/rGO electrocatalyst, further confirming the higher ORR activity of the latter. On the other hand, CuAg/rGO showed higher peak current densities (−3.96 mA cm −2 ) for HPRR compared to those recorded for CoAg/rGO electrocatalyst (−1.96 mA cm −2 ).
Keywords	oxygen reduction reaction ; hydrogen peroxide reduction reaction ; nanoparticles ; CuAg alloy ; CoAg alloy ; reduced graphene oxide ; Chemistry ; QD1-999
Subject code	333
Language	English
Publishing date	2022-08-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Structural, Optical, and Electrical Investigations of Nd 2 O 3 -Doped PVA/PVP Polymeric Composites for Electronic and Optoelectronic Applications

Samer H. Zyoud / Ali Almoadi / Thekrayat H. AlAbdulaal / Mohammed S. Alqahtani / Farid A. Harraz / Mohammad S. Al-Assiri / Ibrahim S. Yahia / Heba Y. Zahran / Mervat I. Mohammed / Mohamed Sh. Abdel-wahab

Polymers, Vol 15, Iss 1351, p

2023 Volume 1351

Abstract: In this present work, a PVA/PVP-blend polymer was doped with various concentrations of neodymium oxide (PB-Nd +3 ) composite films using the solution casting technique. X-ray diffraction (XRD) analysis was used to investigate the composite structure and ... ...

Abstract	In this present work, a PVA/PVP-blend polymer was doped with various concentrations of neodymium oxide (PB-Nd +3 ) composite films using the solution casting technique. X-ray diffraction (XRD) analysis was used to investigate the composite structure and proved the semi-crystallinity of the pure PVA/PVP polymeric sample. Furthermore, Fourier transform infrared (FT-IR) analysis, a chemical-structure tool, illustrated a significant interaction of PB-Nd +3 elements in the polymeric blends. The transmittance data reached 88% for the host PVA/PVP blend matrix, while the absorption increased with the high dopant quantities of PB-Nd +3 . The absorption spectrum fitting (ASF) and Tauc’s models optically estimated the direct and indirect energy bandgaps, where the addition of PB-Nd +3 concentrations resulted in a drop in the energy bandgap values. A remarkably higher quantity of Urbach energy for the investigated composite films was observed with the increase in the PB-Nd +3 contents. Moreover, seven theoretical equations were utilized, in this current research, to indicate the correlation between the refractive index and the energy bandgap. The indirect bandgaps for the proposed composites were evaluated to be in the range of 5.6 eV to 4.82 eV; in addition, the direct energy gaps decreased from 6.09 eV to 5.83 eV as the dopant ratios increased. The nonlinear optical parameters were influenced by adding PB-Nd +3 , which tended to increase the values. The PB-Nd +3 composite films enhanced the optical limiting effects and offered a cut-off laser in the visible region. The real and imaginary parts of the dielectric permittivity of the blend polymer embedded in PB-Nd +3 increased in the low-frequency region. The AC conductivity and nonlinear I-V characteristics were augmented with the doping level of PB-Nd +3 contents in the blended PVA/PVP polymer. The outstanding findings regarding the structural, electrical, optical, and dielectric performance of the proposed materials show that the new PB-Nd +3 -doped PVA/PVP composite ...
Keywords	PVA/PVP ; neodymium oxide-doped PVA/PVP composite films ; XRD/FT-IR ; nonlinear optical properties ; nonlinear I-V curve ; Organic chemistry ; QD241-441
Subject code	333
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Development and Characterization of Drug Loaded PVA/PCL Fibres for Wound Dressing Applications

Ali Afzal / Mohammed Jalalah / Abid Noor / Zubair Khaliq / Muhammad Bilal Qadir / Rashid Masood / Ahsan Nazir / Sheraz Ahmad / Faheem Ahmad / Muhammad Irfan / Munazza Afzal / Mohd Faisal / Saeed A. Alsareii / Farid A. Harraz

Polymers, Vol 15, Iss 1355, p

2023 Volume 1355

Abstract: Nowadays, synthetic polymers are used in medical applications due to their special biodegradable, biocompatible, hydrophilic, and non-toxic properties. The materials, which can be used for wound dressing fabrication with controlled drug release profile, ... ...

Abstract	Nowadays, synthetic polymers are used in medical applications due to their special biodegradable, biocompatible, hydrophilic, and non-toxic properties. The materials, which can be used for wound dressing fabrication with controlled drug release profile, are the need of the time. The main aim of this study was to develop and characterize polyvinyl alcohol/polycaprolactone (PVA/PCL) fibres containing a model drug. A dope solution comprising PVA/PCL with the drug was extruded into a coagulation bath and became solidified. The developed PVA/PCL fibres were then rinsed and dried. These fibres were tested for Fourier transform infrared spectroscopy, linear density, topographic analysis, tensile properties, liquid absorption, swelling behaviour, degradation, antimicrobial activity, and drug release profile for improved and better healing of the wound. From the results, it was concluded that PVA/PCL fibres containing a model drug can be produced by using the wet spinning technique and have respectable tensile properties; adequate liquid absorption, swelling %, and degradation %; and good antimicrobial activity with the controlled drug release profile of the model drug for wound dressing applications.
Keywords	antimicrobial ; drug release ; medical ; polycaprolactone ; wound dressing ; Organic chemistry ; QD241-441
Subject code	660
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Nano-Silica Bubbled Structure Based Durable and Flexible Superhydrophobic Electrospun Nanofibrous Membrane for Extensive Functional Applications

Misbah Batool / Hasan B. Albargi / Adnan Ahmad / Zahid Sarwar / Zubair Khaliq / Muhammad Bilal Qadir / Salman Noshear Arshad / Rizwan Tahir / Sultan Ali / Mohammed Jalalah / Muhammad Irfan / Farid A. Harraz

Nanomaterials, Vol 13, Iss 1146, p

2023 Volume 1146

Abstract: Nanoscale surface roughness has conventionally been induced by using complicated approaches; however, the homogeneity of superhydrophobic surface and hazardous pollutants continue to have existing challenges that require a solution. As a prospective ... ...

Abstract	Nanoscale surface roughness has conventionally been induced by using complicated approaches; however, the homogeneity of superhydrophobic surface and hazardous pollutants continue to have existing challenges that require a solution. As a prospective solution, a novel bubbled-structured silica nanoparticle (SiO 2 ) decorated electrospun polyurethane (PU) nanofibrous membrane (SiO 2 @PU-NFs) was prepared through a synchronized electrospinning and electrospraying process. The SiO 2 @PU-NFs nanofibrous membrane exhibited a nanoscale hierarchical surface roughness, attributed to excellent superhydrophobicity. The SiO 2 @PU-NFs membrane had an optimized fiber diameter of 394 ± 105 nm and was fabricated with a 25 kV applied voltage, 18% PU concentration, 20 cm spinning distance, and 6% SiO 2 nanoparticles. The resulting membrane exhibited a water contact angle of 155.23°. Moreover, the developed membrane attributed excellent mechanical properties (14.22 MPa tensile modulus, 134.5% elongation, and 57.12 kPa hydrostatic pressure). The composite nanofibrous membrane also offered good breathability characteristics (with an air permeability of 70.63 mm/s and a water vapor permeability of 4167 g/m 2 /day). In addition, the proposed composite nanofibrous membrane showed a significant water/oil separation efficiency of 99.98, 99.97, and 99.98% against the water/xylene, water/n-hexane, and water/toluene mixers. When exposed to severe mechanical stresses and chemicals, the composite nanofibrous membrane sustained its superhydrophobic quality (WCA greater than 155.23°) up to 50 abrasion, bending, and stretching cycles. Consequently, this composite structure could be a good alternative for various functional applications.
Keywords	superhydrophobicity ; nano-silica ; nano-roughness ; composite electrospun fibers ; self-cleaning ; water–oil separation ; Chemistry ; QD1-999
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Organic analytes sensitivity in meso-porous silicon electrical sensor with front side and backside contacts

Farid A. Harraz / Adel A. Ismail / M. Faisal / S.A. Al-Sayari / A. Al-Hajry / M.S. Al-Assiri

Arabian Journal of Chemistry, Vol 13, Iss 1, Pp 444-

2020 Volume 452

Abstract: Chemical sensors fabricated from porous silicon (PSi) for liquid organic analytes (ethanol, acetonitrile, methanol and acetone) are demonstrated, with an emphasis on the impact of the Ag electrical contact placement on sensor performance. Sensors with ... ...

Abstract	Chemical sensors fabricated from porous silicon (PSi) for liquid organic analytes (ethanol, acetonitrile, methanol and acetone) are demonstrated, with an emphasis on the impact of the Ag electrical contact placement on sensor performance. Sensors with front side contact display larger shift in capacitance response (2–3 times more sensitive) compared to the backside sensor design as the solvents immediately interact with the pore openings before infiltration. Much slower response time (7–30 min range) for front side vs. (50–200 s scale range) for backside configuration is observed. Both sensor designs exhibit excellent solvent infiltration-evaporation reversible response, indicating no chemical reaction or surface modification occurred. The response time was in the order of ethanol > acetonitrile > methanol > acetone, which correlates well with the solvent vapor pressure. The capacitance shift in both sensor devices is likely related to the interface interaction, revealing a closer correlation with the dipole moments of solvents. This is supported by the photoluminescence quenching upon exposure to organic solvents, with a relative intensity decrease tracks with the dipole moment. The sensitivity remains sufficiently high during the repeated use, with excellent storage stability for backside contact. This comparative study suggests the viability of the current sensor structure and design particularly with backside contact for sensing of various chemical analytes with notably sensitivity and extremely rapid response. Keywords: Meso-porous silicon, Electrical sensor, Capacitance, Photoluminescence, Organic solvents
Keywords	Chemistry ; QD1-999
Subject code	600 ; 620
Language	English
Publishing date	2020-01-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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