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Article: Fluorescence sensing and adsorption kinetics of Gd-doped AgInS

May, Bambesiwe M / Fakayode, Olayemi J / Bambo, Mokae F / Mishra, Ajay K / Nxumalo, Edward N

2023 Volume 9, Issue 8, Page(s) e19020

Abstract: The poor fluorescence properties of magneto-fluorescent paramagnetic-ion (Gd, Mn, or Co) doped I-III-VI quantum dots (QDs) at higher paramagnetic-ion doping concentrations have limited their use in magnetic-driven water-based applications. This work ... ...

Abstract	The poor fluorescence properties of magneto-fluorescent paramagnetic-ion (Gd, Mn, or Co) doped I-III-VI quantum dots (QDs) at higher paramagnetic-ion doping concentrations have limited their use in magnetic-driven water-based applications. This work presents, for the first time, the use of stable magneto-fluorescent Gd-doped AgInS
Language	English
Publishing date	2023-08-07
Publishing country	England
Document type	Journal Article
ZDB-ID	2835763-2
ISSN	2405-8440
ISSN	2405-8440
DOI	10.1016/j.heliyon.2023.e19020
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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: A Mini-Review of Nanocellulose-Based Nanofiber Membranes Incorporating Carbon Nanomaterials for Dye Wastewater Treatment

Moyo, Senelisile / Gumbi, Nozipho N. / De Kock, Lueta A. / Nxumalo, Edward N.

Environmental nanotechnology, monitoring & management. 2022 June 15,

2022

Abstract: Nanocellulose has over the past decades attracted considerable interest due to its favourable properties compared to the commonly used polymeric materials in the fabrication of wastewater treatment nanofiber membranes. This review presents an overview of ...

Abstract	Nanocellulose has over the past decades attracted considerable interest due to its favourable properties compared to the commonly used polymeric materials in the fabrication of wastewater treatment nanofiber membranes. This review presents an overview of the different types of nanocellulose used in the production of nanofiber membranes, their production routes, and properties, as well as their application in dye wastewater treatment. Traditionally, nanocellulose has been used as an additive in polymeric materials in membrane applications, with better understanding of the properties, characteristics and structure of nanocellulose. Recently, workers shifted towards using nanocellulose as a membrane material instead of an additive. This mini-review first investigates the use of nanocellulose as a sole membrane material to produce membranes normally referred to as nanopapers for use in dye wastewater remediation, its limitations as a membrane material, and the fabrication methods that have been used to produce nanocellulose-based membranes. It has been shown that these nanopapers can be used in both adsorption and filtration processes. Different methods that are used to improve the adsorption and filtration efficiency of pure nanocellulose membranes are also evaluated with a special focus on surface functionalisation and the use of carbon-based nanomaterials in improving the efficiency of nanocellulose-based membranes in wastewater treatment applications particularly in the removal of hazardous dye species. The use of carbon nanotubes and graphene oxide with nanocellulose has been shown to significantly improve the membrane flux, adsorption capacity as well as wet and dry strength of the nanocellulose membranes which consequently leads to enhanced membrane efficiency.
Keywords	administrative management ; adsorption ; carbon nanotubes ; cellulose ; dry strength ; dyes ; filtration ; graphene oxide ; nanofibers ; polymers ; remediation ; wastewater ; wastewater treatment
Language	English
Dates of publication	2022-0615
Publishing place	Elsevier B.V.
Document type	Article
Note	Pre-press version
ZDB-ID	2821777-9
ISSN	2215-1532
ISSN	2215-1532
DOI	10.1016/j.enmm.2022.100714
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Article: A review on I–III–VI ternary quantum dots for fluorescence detection of heavy metals ions in water: optical properties, synthesis and application

May, Bambesiwe M. / Bambo, Mokae F. / Hosseini, Seyed Saeid / Sidwaba, Unathi / Nxumalo, Edward N. / Mishra, Ajay K.

RSC advances. 2022 Apr. 11, v. 12, no. 18

2022

Abstract: Heavy metal contamination remains a major threat to the environment. Evaluating the concentrations of heavy metals in water environments is a crucial step towards a viable treatment strategy. Non-cadmium photo-luminescent I–III–VI ternary QDs have ... ...

Abstract	Heavy metal contamination remains a major threat to the environment. Evaluating the concentrations of heavy metals in water environments is a crucial step towards a viable treatment strategy. Non-cadmium photo-luminescent I–III–VI ternary QDs have attracted increasing attention due to their low toxicity and extraordinary optical properties, which have made them popular in biological applications. Recently, ternary I–III–VI-QDs have gained growing interest as fluorescent detectors of heavy metal ions in water. Here, we review the research progress of ternary I–III–VI QDs for the fluorescence detection of heavy metal ions in water. First, we summarize the optical properties and synthesis methodologies of ternary I–III–VI QDs. Then, we present various detection mechanisms involved in the fluorescence detection of heavy metal ions, which are mostly attributed to direct interaction between these unique QDs and the metal ions, seen in the form of fluorescence quenching and fluorescence enhancement. We also display the potential applications in environmental remediation such as water treatment and associated challenges of I–III–VI QDs in the fluorescence detection of Cu²⁺ and other metal ions.
Keywords	fluorescence ; heavy metals ; remediation ; toxicity ; water treatment
Language	English
Dates of publication	2022-0411
Size	p. 11216-11232.
Publishing place	The Royal Society of Chemistry
Document type	Article
ISSN	2046-2069
DOI	10.1039/d1ra08660j
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Article ; Online: Poly (ether) sulfone electrospun nanofibrous membranes embedded with graphene oxide quantum dots with antimicrobial activity.

Tshangana, Charmaine S / Muleja, Adolph A / Nxumalo, Edward N / Mhlanga, Sabelo D

Environmental science and pollution research international

2020 Volume 27, Issue 21, Page(s) 26845–26855

Abstract: This work describes the development of novel electrospun nanofibrous membranes (ENMs) prepared by embedding graphene oxide quantum dots (GOQDs) into poly (ether) sulfone (PES). FTIR and Raman spectroscopy confirmed the successful incorporation of the ... ...

Abstract	This work describes the development of novel electrospun nanofibrous membranes (ENMs) prepared by embedding graphene oxide quantum dots (GOQDs) into poly (ether) sulfone (PES). FTIR and Raman spectroscopy confirmed the successful incorporation of the GOQDs into the PES membranes. The optimal electrospinning polymer concentration that showed no defects or bead formation was at 26 wt% of the PES polymer. Spectroscopy, microscopy and contact angle were some of the techniques used to characterize the ENMs. SEM images showed smooth and unbranched ENMs. The average diameter upon incorporation of the GOQDs was determined to be 2.45 μm. XRD revealed that the GOQDs were structurally close to graphite with an interlaying space of 0.36 nm. The antimicrobial effect of the GOQDs-PES electrospun nanofibrous membranes was assessed against three bacterial strains (Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Bacillus cereus (B. cereus)) using the disc diffusion method. The electrospun nanofibres containing 10 wt% of GOQDs showed the most active antimicrobial activity against all three bacterial strains tested. The zones of inhibition ranged from 9 to 40 mm. The minimum inhibitory concentration (MIC) was determined to be 0.5 mg/mL, 0.3 mg/mL and 0.2 mg/mL for E. coli, B. cereus and S. aureus, respectively. The results demonstrated that incorporating GOQDs in the PES nanofibre gives rise to new antimicrobial properties, and as a result, the GOQDs-PES nanofibrous membrane can be used in antimicrobial applications such as water treatment.
MeSH term(s)	Anti-Infective Agents ; Escherichia coli ; Ether ; Ethers ; Graphite ; Nanofibers ; Quantum Dots ; Staphylococcus aureus ; Sulfones
Chemical Substances	Anti-Infective Agents ; Ethers ; Sulfones ; graphene oxide ; Ether (0F5N573A2Y) ; Graphite (7782-42-5)
Language	English
Publishing date	2020-05-07
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-020-09080-w
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Article: Photocatalytic Nanofiber Membranes for the Degradation of Micropollutants and Their Antimicrobial Activity: Recent Advances and Future Prospects.

Chabalala, Mandla B / Gumbi, Nozipho N / Mamba, Bhekie B / Al-Abri, Mohammed Z / Nxumalo, Edward N

Membranes

2021 Volume 11, Issue 9

Abstract: This review paper systematically evaluates current progress on the development and performance of photocatalytic nanofiber membranes often used in the removal of micropollutants from water systems. It is demonstrated that nanofiber membranes serve as ... ...

Abstract	This review paper systematically evaluates current progress on the development and performance of photocatalytic nanofiber membranes often used in the removal of micropollutants from water systems. It is demonstrated that nanofiber membranes serve as excellent support materials for photocatalytic nanoparticles, leading to nanofiber membranes with enhanced optical properties, as well as improved recovery, recyclability, and reusability. The tremendous performance of photocatalytic membranes is attributed to the photogenerated reactive oxygen species such as hydroxyl radicals, singlet oxygen, and superoxide anion radicals introduced by catalytic nanoparticles such as TiO
Language	English
Publishing date	2021-08-31
Publishing country	Switzerland
Document type	Journal Article ; Review
ISSN	2077-0375
ISSN	2077-0375
DOI	10.3390/membranes11090678
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Article ; Online: A review on I-III-VI ternary quantum dots for fluorescence detection of heavy metals ions in water: optical properties, synthesis and application.

May, Bambesiwe M / Bambo, Mokae F / Hosseini, Seyed Saeid / Sidwaba, Unathi / Nxumalo, Edward N / Mishra, Ajay K

RSC advances

2022 Volume 12, Issue 18, Page(s) 11216–11232

Abstract	Heavy metal contamination remains a major threat to the environment. Evaluating the concentrations of heavy metals in water environments is a crucial step towards a viable treatment strategy. Non-cadmium photo-luminescent I-III-VI ternary QDs have attracted increasing attention due to their low toxicity and extraordinary optical properties, which have made them popular in biological applications. Recently, ternary I-III-VI-QDs have gained growing interest as fluorescent detectors of heavy metal ions in water. Here, we review the research progress of ternary I-III-VI QDs for the fluorescence detection of heavy metal ions in water. First, we summarize the optical properties and synthesis methodologies of ternary I-III-VI QDs. Then, we present various detection mechanisms involved in the fluorescence detection of heavy metal ions, which are mostly attributed to direct interaction between these unique QDs and the metal ions, seen in the form of fluorescence quenching and fluorescence enhancement. We also display the potential applications in environmental remediation such as water treatment and associated challenges of I-III-VI QDs in the fluorescence detection of Cu
Language	English
Publishing date	2022-04-11
Publishing country	England
Document type	Journal Article ; Review
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/d1ra08660j
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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: Poly (ether) sulfone electrospun nanofibrous membranes embedded with graphene oxide quantum dots with antimicrobial activity

Tshangana, Charmaine S / Muleja, Adolph A / Nxumalo, Edward N / Mhlanga, Sabelo D

Environmental science and pollution research. 2020 July, v. 27, no. 21

2020

Abstract	This work describes the development of novel electrospun nanofibrous membranes (ENMs) prepared by embedding graphene oxide quantum dots (GOQDs) into poly (ether) sulfone (PES). FTIR and Raman spectroscopy confirmed the successful incorporation of the GOQDs into the PES membranes. The optimal electrospinning polymer concentration that showed no defects or bead formation was at 26 wt% of the PES polymer. Spectroscopy, microscopy and contact angle were some of the techniques used to characterize the ENMs. SEM images showed smooth and unbranched ENMs. The average diameter upon incorporation of the GOQDs was determined to be 2.45 μm. XRD revealed that the GOQDs were structurally close to graphite with an interlaying space of 0.36 nm. The antimicrobial effect of the GOQDs-PES electrospun nanofibrous membranes was assessed against three bacterial strains (Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Bacillus cereus (B. cereus)) using the disc diffusion method. The electrospun nanofibres containing 10 wt% of GOQDs showed the most active antimicrobial activity against all three bacterial strains tested. The zones of inhibition ranged from 9 to 40 mm. The minimum inhibitory concentration (MIC) was determined to be 0.5 mg/mL, 0.3 mg/mL and 0.2 mg/mL for E. coli, B. cereus and S. aureus, respectively. The results demonstrated that incorporating GOQDs in the PES nanofibre gives rise to new antimicrobial properties, and as a result, the GOQDs-PES nanofibrous membrane can be used in antimicrobial applications such as water treatment.
Keywords	Bacillus cereus ; Escherichia coli ; Raman spectroscopy ; Staphylococcus aureus ; antimicrobial properties ; contact angle ; graphene ; graphene oxide ; minimum inhibitory concentration ; nanofibers ; pollution ; polymers ; research ; water treatment
Language	English
Dates of publication	2020-07
Size	p. 26845-26855.
Publishing place	Springer Berlin Heidelberg
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	1178791-0
ISSN	1614-7499 ; 0944-1344
ISSN (online)	1614-7499
ISSN	0944-1344
DOI	10.1007/s11356-020-09080-w
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Microwave-assisted synthesis of coal fly ash-based zeolites for removal of ammonium from urine.

Makgabutlane, Boitumelo / Nthunya, Lebea N / Musyoka, Nicholas / Dladla, Bongumusa S / Nxumalo, Edward N / Mhlanga, Sabelo D

RSC advances

2020 Volume 10, Issue 4, Page(s) 2416–2427

Abstract: Zeolites synthesized from biomass waste materials offer a great opportunity in the sustainable utilization of the waste. In this work, energy-efficient processes ( ...

Abstract	Zeolites synthesized from biomass waste materials offer a great opportunity in the sustainable utilization of the waste. In this work, energy-efficient processes (
Language	English
Publishing date	2020-01-14
Publishing country	England
Document type	Journal Article
ISSN	2046-2069
ISSN (online)	2046-2069
DOI	10.1039/c9ra10114d
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