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Article: TiO

Madima, Ntakadzeni / Kefeni, Kebede K / Mishra, Shivani B / Mishra, Ajay K

2022 Volume 8, Issue 9, Page(s) e10683

Abstract: In the current study, a direct S-scheme titanium dioxide/graphitic carbon nitride ( ... ...

Abstract	In the current study, a direct S-scheme titanium dioxide/graphitic carbon nitride (TiO
Language	English
Publishing date	2022-09-18
Publishing country	England
Document type	Journal Article
ZDB-ID	2835763-2
ISSN	2405-8440
ISSN	2405-8440
DOI	10.1016/j.heliyon.2022.e10683
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Development of nitrogen-doped graphene/MOF nanocomposites towards adsorptive removal of Cr(VI) from the wastewater of the Herbert Bickley treatment works

Madumo, Tshireletso M. / Zikalala, Sithembela A. / Gumbi, Nozipho N. / Mishra, Shivani B. / Ntsendwana, Bulelwa / Nxumalo, Edward N.

Environmental Nanotechnology, Monitoring & Management. 2023, p.100794-

2023 , Page(s) 100794–

Abstract: Industrial effluents laden with Cr(VI) pose considerable health risks to humans and animals if left untreated. Hence, metal-organic framework-5/nitrogen-doped graphene (MOF-5/NGO) nanocomposites were fabricated with increasing NGO loading (0.05, 0.10 and ...

Abstract	Industrial effluents laden with Cr(VI) pose considerable health risks to humans and animals if left untreated. Hence, metal-organic framework-5/nitrogen-doped graphene (MOF-5/NGO) nanocomposites were fabricated with increasing NGO loading (0.05, 0.10 and 0.15 wt. %) to investigate the role of NGO content of the chemical and physical properties of the composites. The FTIR spectra show the nanocomposites be to be rich in surface -OH and -COOH functional groups. Raman spectroscopy confirmed bond formation between the MOF-5 and NGO through downshift of the G- and 2D-bands. XRD showed MOF-5/NGO nanocomposites both the MOF-5 and the NGO to be highly crystalline while thermogravimetric analysis indicated the thermal stabilities of the composites to be enhanced. The SEM micrographs revealed the NGO flakes to be dispersed on the MOF-5 microstructures prior to adsorption and the disappearance of microstructures post adsorption. The as-synthesized nanocomposite exhibited BET surface area in the range 384.55-395.56 m².g⁻¹ which is a significant increase from that of MOF-5 261.00 m².g⁻¹. The optimal conditions for maximum Cr(VI) adsorption were determined to be: pH 2, contact time of 60 min, adsorbent dosage of 6 mg.L⁻¹, initial Cr(VI) concentration of 0.5 mg L⁻¹ and temperature of 30°C. A maximum adsorption efficiency of 46.1% was achieved by the composite MOF-5/NGO (0.05 wt.%) and not significantly compromised by competing metal ions. The Cr(VI) removal on MOF-5/NGO nanocomposites is well described by the Langmuir isotherm, confirming a chemisorption process. In addition, the thermodynamic studies confirmed the adsorption process to be favorable, spontaneous and endothermic. The Cr(VI) removal % on MOF-5/NGO from real water was found to be 52.1%. Therefore, the novel MOF-5/NGO nanocomposite can be applied for efficient Cr(VI) removal from real wastewater due to synergistic surface morphologies between NGO and MOF-5 units characterized by better adsorption capacity not met by pristine materials.
Keywords	Raman spectroscopy ; administrative management ; adsorbents ; adsorption ; endothermy ; graphene ; nanocomposites ; nanotechnology ; pH ; sorption isotherms ; surface area ; temperature ; thermodynamics ; thermogravimetry ; wastewater ; Metal-organic framework-5 ; Nitrogen doped graphene ; Chromium (VI)
Language	English
Publishing place	Elsevier B.V.
Document type	Article ; Online
Note	Pre-press version
ZDB-ID	2821777-9
ISSN	2215-1532
ISSN	2215-1532
DOI	10.1016/j.enmm.2023.100794
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Article ; Online: TiO2-modified g-C3N4 nanocomposite for photocatalytic degradation of organic dyes in aqueous solution

Madima, Ntakadzeni / Kefeni, Kebede K. / Mishra, Shivani B. / Mishra, Ajay K.

Heliyon. 2022 Sept., v. 8, no. 9 p.e10683-

2022

Abstract: In the current study, a direct S-scheme titanium dioxide/graphitic carbon nitride (TiO₂/g-C₃N₄) heterojunction structure was fabricated via simultaneous calcination of TiO₂ precursors and g-C₃N₄. Guava leaf extract was utilized as a reductant for TiO₂ ... ...

Abstract	In the current study, a direct S-scheme titanium dioxide/graphitic carbon nitride (TiO₂/g-C₃N₄) heterojunction structure was fabricated via simultaneous calcination of TiO₂ precursors and g-C₃N₄. Guava leaf extract was utilized as a reductant for TiO₂ production through a green synthetic method, and g-C₃N₄ was prepared by thermal decomposition of melamine. The pristine and nanocomposite photocatalysts were characterized by XRD, FTIR, BET, TGA, HRTEM, UV-vis DRS, and PL to elucidate their physicochemical properties. The photocatalytic activity of synthesized photocatalysts was examined through the degradation of rhodamine B (RhB) and methylene blue (MB) dyes under simulated solar light irradiation. The nanocomposite exhibited commendable photocatalytic performances with 96% degradation efficiency of RhB attained in 120 min and 95% degradation efficiency of MB achieved in 150 min. The enhanced photocatalytic activities were attributable to visible light-harvesting characteristics and the formation of an S-scheme heterojunction system between two catalysts which promotes interfacial charge separation efficiency and longer charge carrier lifespan. After 4 consecutive cycles, the degradation efficiencies of both RhB and MB remained above 85%. According to the trapping experiments, OH• and O₂•⁻ radicals were critical in the degradation of RhB, while h⁺ and O₂•⁻ radicals were dominant in the degradation of MB. The nanocomposite was also tested for elution of actual water pollutants by combining two dyes, and above 90% degradation efficiencies were achieved for both dyes after 240 min.
Keywords	aqueous solutions ; carbon nitride ; graphene ; guavas ; irradiation ; leaf extracts ; lighting ; longevity ; melamine ; methylene blue ; nanocomposites ; photocatalysis ; photocatalysts ; reducing agents ; rhodamines ; thermal degradation ; titanium dioxide ; Green synthesis ; Photocatalytic degradation ; Nanocomposite ; Radical scavenger
Language	English
Dates of publication	2022-09
Publishing place	Elsevier Ltd
Document type	Article ; Online
Note	Use and reproduction
ZDB-ID	2835763-2
ISSN	2405-8440
ISSN	2405-8440
DOI	10.1016/j.heliyon.2022.e10683
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Nanocellulose-based composites for the removal of contaminants from wastewater.

Tshikovhi, A / Mishra, Shivani B / Mishra, Ajay K

International journal of biological macromolecules

2020 Volume 152, Page(s) 616–632

Abstract: Polymers derived from plant and animal sources are of great interest in wastewater remediation due to their cost-effectiveness and renewable adsorption capabilities, one such polymer is nanocellulose (NC). NC has gained a lot of attention in various ... ...

Abstract	Polymers derived from plant and animal sources are of great interest in wastewater remediation due to their cost-effectiveness and renewable adsorption capabilities, one such polymer is nanocellulose (NC). NC has gained a lot of attention in various research fields due to its abundance in nature, nano-dimension, high surface area, stability and bio-compatibility. As a result, NC has emerged as a great potential adsorbent for the removal of contaminants such as heavy metals, organic dyes, oils, pharmaceutical and etc. in the environmental remediation. This review focuses on the description of the building blocks, structure, properties, isolation and also discusses the potential of nanocellulose based composites materials with reinforcements such as activated carbon, carbon nanotube, graphene oxides, metals, non-metals and ceramics that were effectively used as an adsorbents for diverse organic and inorganic contaminants in water.
MeSH term(s)	Animals ; Biocompatible Materials/chemistry ; Cellulose/chemistry ; Environmental Restoration and Remediation/methods ; Humans ; Nanoparticles/chemistry ; Polymers/chemistry ; Waste Water/chemistry ; Water Pollutants, Chemical/chemistry ; Water Purification/methods
Chemical Substances	Biocompatible Materials ; Polymers ; Waste Water ; Water Pollutants, Chemical ; Cellulose (9004-34-6)
Language	English
Publishing date	2020-02-22
Publishing country	Netherlands
Document type	Journal Article ; Review
ZDB-ID	282732-3
ISSN	1879-0003 ; 0141-8130
ISSN (online)	1879-0003
ISSN	0141-8130
DOI	10.1016/j.ijbiomac.2020.02.221
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Article: Nanocellulose-based composites for the removal of contaminants from wastewater

Tshikovhi, A / Mishra, Shivani B / Mishra, Ajay K

International journal of biological macromolecules. 2020 June 01, v. 152

2020

Abstract	Polymers derived from plant and animal sources are of great interest in wastewater remediation due to their cost-effectiveness and renewable adsorption capabilities, one such polymer is nanocellulose (NC). NC has gained a lot of attention in various research fields due to its abundance in nature, nano-dimension, high surface area, stability and bio-compatibility. As a result, NC has emerged as a great potential adsorbent for the removal of contaminants such as heavy metals, organic dyes, oils, pharmaceutical and etc. in the environmental remediation. This review focuses on the description of the building blocks, structure, properties, isolation and also discusses the potential of nanocellulose based composites materials with reinforcements such as activated carbon, carbon nanotube, graphene oxides, metals, non-metals and ceramics that were effectively used as an adsorbents for diverse organic and inorganic contaminants in water.
Keywords	activated carbon ; adsorbents ; adsorption ; carbon nanotubes ; cellulose ; ceramics ; cost effectiveness ; dyes ; graphene oxide ; heavy metals ; oils ; polymers ; remediation ; surface area ; wastewater ; water pollution
Language	English
Dates of publication	2020-0601
Size	p. 616-632.
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	282732-3
ISSN	1879-0003 ; 0141-8130
ISSN (online)	1879-0003
ISSN	0141-8130
DOI	10.1016/j.ijbiomac.2020.02.221
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Impact of Fluorination on Microstructures and Surface Properties of SiC Nanocomposites with Si

Mojaki, Seadimo C / Mishra, Shivani B / Mishra, Ajay K

ACS omega

2019 Volume 4, Issue 25, Page(s) 20931–20936

Abstract: Silicon carbide (SiC) is an effective catalyst for generating fuel from organics through gasification. SiC has shown promising results as a catalyst due to its extraordinary thermal and oxidation resistance abilities. Researchers are yet to identify an ... ...

Abstract	Silicon carbide (SiC) is an effective catalyst for generating fuel from organics through gasification. SiC has shown promising results as a catalyst due to its extraordinary thermal and oxidation resistance abilities. Researchers are yet to identify an efficient silicon carbide composite material that enhances the desired quality of fuel/liquid production. The present study deals with in situ synthesis of fluorine-doped silicon carbide using agriculture waste. Biochar, a waste by-product from the gasification process, proved to be a potential carbon source for fabrication of silicon carbide nanowires (SiCNWs). Pristine SiCNWs exhibited nanospheres and freestanding nanowire (coiled, rods, bamboolike, or hexagonal prism) structures with transversal optical mode indexed to the β-phase (β-SiC). Fabrication of fluorine (F)-doped SiC from a silica-carbon-fluorine (SiO
Language	English
Publishing date	2019-12-03
Publishing country	United States
Document type	Journal Article
ISSN	2470-1343
ISSN (online)	2470-1343
DOI	10.1021/acsomega.9b01952
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Article: Mechanistic pathways for the degradation of SMX drug and floatation of degraded products using F–Pt co-doped TiO₂ photocatalysts

Jahdi, Majid / Mishra, Shivani B / Nxumalo, Edward N / Mhlanga, Sabelo D / Mishra, Ajay K

RSC advances. 2020 July 24, v. 10, no. 46

2020

Abstract: This work presents smart pathways to enhance the photocatalytic activity of TiO₂via co-doping with fluorine (F) and platinum (Pt) to form F–Pt co-doped TiO₂ photocatalysts and investigates the unique and unusual fluorination of the floated products. Our ... ...

Abstract	This work presents smart pathways to enhance the photocatalytic activity of TiO₂via co-doping with fluorine (F) and platinum (Pt) to form F–Pt co-doped TiO₂ photocatalysts and investigates the unique and unusual fluorination of the floated products. Our investigations indicate that the crystalline structure of the photocatalysts was a mixture of anatase and brookite phases and that the nanoparticles of the synthesized nanocomposites had nanometric sizes (4–25 nm). The F–Pt co-doped TiO₂ nano-photocatalysts demonstrated degradation of sulfamethoxazole (SMX) drug of >93% within 90 min under direct solar light and 58% degradation within 360 min under a solar simulator. Thus, co-doping TiO₂ with F and Pt atoms to form F–Pt co-doped TiO₂ nanocomposite is an efficient pathway to achieve high photocatalytic performance escorted with the formation of floating metal-fluoropolymer, unlike pristine TiO₂ which has less photocatalytic degradation and no generation of a floating polymer. Our photocatalytic protocol demonstrates that the degradation of SMX started with redox reactions of oxygen and water absorbed on the surface of the prepared nanocomposites to form superoxide anions (O₂˙⁻) and hydroxy radicals (˙OH) which have oxidation superpower. The resultant products were subsequently fluorinated by fluoride radical ions and floated as metal-fluoropolymer.
Keywords	crystal structure ; fluorides ; fluorine ; free radicals ; hydroxyl radicals ; ions ; nanocatalysts ; nanocomposites ; nanoparticles ; oxidation ; oxygen ; photocatalysis ; photocatalysts ; platinum ; polymers ; solar radiation ; sulfamethoxazole ; superoxide anion ; titanium dioxide
Language	English
Dates of publication	2020-0724
Size	p. 27662-27675.
Publishing place	The Royal Society of Chemistry
Document type	Article
ISSN	2046-2069
DOI	10.1039/d0ra05009a
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Article ; Online: Mechanistic pathways for the degradation of SMX drug and floatation of degraded products using F-Pt co-doped TiO

Jahdi, Majid / Mishra, Shivani B / Nxumalo, Edward N / Mhlanga, Sabelo D / Mishra, Ajay K

RSC advances

2020 Volume 10, Issue 46, Page(s) 27662–27675

Abstract: This work presents smart pathways to enhance the photocatalytic activity of ... ...

Abstract	This work presents smart pathways to enhance the photocatalytic activity of TiO
Language	English
Publishing date	2020-07-24
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d0ra05009a
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Article ; Online: Catalytic reduction of p-nitrophenol by using platinum nanoparticles stabilised by guar gum.

Pandey, Sadanand / Mishra, Shivani B

Carbohydrate polymers

2014 Volume 113, Page(s) 525–531

Abstract: We report a facile and green method to synthesise highly stable dispersions of platinum nanoparticles (PtNPs) with an average particle size of ∼ 6 nm. Natural, nontoxic, eco-friendly biopolymer guar gum was utilised as both the reducing and capping agent ...

Abstract	We report a facile and green method to synthesise highly stable dispersions of platinum nanoparticles (PtNPs) with an average particle size of ∼ 6 nm. Natural, nontoxic, eco-friendly biopolymer guar gum was utilised as both the reducing and capping agent precursor in aqueous medium. The PtNPs that had been stabilised by guar gum (GG-s-PtNPs) were characterised by UV-vis spectroscopy, XRD, TEM and XPS. GG-s-PtNPs performed better in terms of catalytic activity for the liquid phase reduction of p-nitrophenol (p-NP) compared to p-aminophenol (p-AP). The efficiency of the catalytic reduction of p-NP over GG-s-PtNPs was found to be 97% in a total time of 320 s at room temperature. The mechanisms of the synthesis and catalytic reduction of p-NP are also discussed. The synthesis approach presented here does not require stringent conditions or toxic agents and thus is a straightforward, rapid, efficient, and green approach to the fabrication of highly active catalysts.
Language	English
Publishing date	2014-11-26
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1501516-6
ISSN	1879-1344 ; 0144-8617
ISSN (online)	1879-1344
ISSN	0144-8617
DOI	10.1016/j.carbpol.2014.07.047
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Article ; Online: Gum ghatti and Fe₃O₄ magnetic nanoparticles based nanocomposites for the effective adsorption of rhodamine B.

Mittal, H / Mishra, Shivani B

Carbohydrate polymers

2014 Volume 101, Page(s) 1255–1264

Abstract: This article reports the development of a new nanocomposite using gum ghatti crosslinked with poly(acrylic acid-co-acrylamide) reinforced with iron oxide magnetic nanoparticles. The nanocomposite was characterized through BET, FT-IR, XRD, SEM-EDX, TGA ... ...

Abstract	This article reports the development of a new nanocomposite using gum ghatti crosslinked with poly(acrylic acid-co-acrylamide) reinforced with iron oxide magnetic nanoparticles. The nanocomposite was characterized through BET, FT-IR, XRD, SEM-EDX, TGA and TEM and applied for the removal of RhB. Different optimized adsorption parameters were adsorbent dose (0.8 g/L) and pH (7.0). The adsorption isotherm data was used to study Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich isotherm models. The value of correlation coefficient confirmed the applicability of Langmuir isotherm model with maximum adsorption efficiency of 654.87 mg/g. The adsorption kinetics data showed pseudo second order reaction. Thermodynamic studies showed that the adsorption process was endothermic and spontaneous. Moreover, the adsorbent was successfully utilized for successive three cycles for the adsorption-desorption of RhB.
MeSH term(s)	Adsorption ; Hydrogen-Ion Concentration ; Kinetics ; Magnetite Nanoparticles/chemistry ; Nanocomposites/chemistry ; Plant Gums/chemistry ; Rhodamines/chemistry ; Thermodynamics
Chemical Substances	Magnetite Nanoparticles ; Plant Gums ; Rhodamines ; rhodamine B (K7G5SCF8IL) ; gum ghatti (X1N78DL020)
Language	English
Publishing date	2014-01-30
Publishing country	England
Document type	Journal Article
ZDB-ID	1501516-6
ISSN	1879-1344 ; 0144-8617
ISSN (online)	1879-1344
ISSN	0144-8617
DOI	10.1016/j.carbpol.2013.09.045
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