Remediation of wastewater using various nano-materials

Anjum, Muzammil; Miandad, R.; Waqas, Muhammad; Gehany, F.; Barakat, M.A.

doi:10.1016/j.arabjc.2016.10.004

Cited by 549 publications

(172 citation statements)

References 247 publications

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“…The summary of photocatalytic degradation pollutant dyes, bacteria containing wastewater, and volatile organic compounds (VOC) in air degraded by various researchers using metal oxide nanofibers, including Last year, Anjum et al [11] published a comprehensive review article on environmental remediation using different nanomaterials. It is clear from their perspective that electrospun nanofibers and other hybrid nano-membranes are very effective for the efficient removal of organic dyes, heavy metals, and foulants.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

Mondal

2017

Inventions

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Recently, wastewater treatment by photocatalytic oxidation processes with metal oxide nanomaterials and nanocomposites such as zinc oxide, titanium dioxide, zirconium dioxide, etc. using ultraviolet (UV) and visible light or even solar energy has added massive research importance. This waste removal technique using nanostructured photocatalysts is well known because of its effectiveness in disintegrating and mineralizing the unsafe organic pollutants such as organic pesticides, organohalogens, PAHs (Polycyclic Aromatic Hydrocarbons), surfactants, microorganisms, and other coloring agents in addition to the prospect of utilizing the solar and UV spectrum. The photocatalysts degrade the pollutants using light energy, which creates energetic electron in the metal oxide and thus generates hydroxyl radical, an oxidative mediator that can oxidize completely the organic pollutant in the wastewater. Altering the morphologies of metal oxide photocatalysts in nanoscale can further improve their photodegradation efficiency. Nanoscale features of the photocatalysts promote enhance light absorption and improved photon harvest property by refining the process of charge carrier generation and recombination at the semiconductor surfaces and in that way boost hydroxyl radicals. The literature covering semiconductor nanomaterials and nanocomposite-assisted photocatalysis-and, among those, metal oxide nanofibers-suggest that this is an attractive route for environmental remediation due to their capability of reaching complete mineralization of organic contaminants under mild reaction conditions such as room temperature and ambient atmospheric pressure with greater degradation performance. The main aim of this review is to highlight the most recent published work in the field of metal oxide nanofibrous photocatalyst-mediated degradation of organic pollutants and unsafe microorganisms present in wastewater. Finally, the recycling and reuse of photocatalysts for viable wastewater purification has also been conferred here and the latest examples given.

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Section: Introductionmentioning

confidence: 99%

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

Mondal

2017

Inventions

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“…Therefore, the catalyst with high reactivity and good oxygen buffering can serve as a suitable candidate. The rapid growth of nanotechnology offers great opportunity to develop the next-generation catalyst for wastewater treatment (Ghasemzadeh et al 2014;Anjum et al 2016). The high activity, mobility in solution, specific surface areas, stability and easy separation from reaction mixture, make them the ultimate candidate for catalysis (Khin et al 2012;Xia et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and catalytic performance of ZnO–CeO2 nanoparticles in wet oxidation of wastewater containing chlorinated compounds

2017

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Here we report the catalytic property of ZnO-CeO 2 nanoparticles towards oxidative degradation of organic pollutants present in industrial wastewater. The catalysts were prepared by co-precipitation method without using any surfactant. The physicochemical properties of catalysts were studied by XRD, Raman, XPS, N 2 -sorption, FE-SEM, TEM and EDX techniques. The characterization results confirmed the formation of porous ZnO-CeO 2 nanocatalysts with high surface area, pore volume and oxygen vacancies. ZnO-CeO 2 nanocatalysts exhibited appreciable efficiency in CWAO of industrial wastewater under mild conditions. The Ce 40 Zn 60 catalyst was found to be most efficient with 72% color, 64% chemical oxygen demand (COD) and 63% total organic carbon (TOC) removal. Efficient removal of chlorophenolics (CHPs, 59%) and adsorbable organic halides (AOX, 54%) indicated the feasibility of using ZnO-CeO 2 nanocatalysts in degradation of non-biodegradable and toxic chlorinated compounds.

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“…5), by applying to the Tauc relationship, namely (αhν) 1/n =C(hν -E g ), where α is the absorption coefficient, C is a constant, hν is the energy of incident photons, and n an exponent whose value depends on the type of transition (the value of 2, typical of direct allowed transitions, can be used for n in the case of ZnO and ZnO/Au). Accordingly, by plotting (αhν) 2 as a function of hν, a linear region is observed, which denotes the onset of absorption. The extrapolation of this region to the abscissa axis yields the energy value of the optical band gap of the material.…”

Section: Nanocolloids Characterisation and Photocatalytic Activity Evmentioning

confidence: 99%

“…The removal of persistent and toxic organic compounds (TOCs) from contaminated water occurs through oxidation and reduction processes. Several kinds of semiconductor-based photo-catalysts, such as titania (TiO 2 ), zirconia (ZrO 2 ), tungsten trioxide (WO 3 ), tantalum pentoxide (Ta 2 O 5 ), hematite (Fe 2 O 3 ) and zinc oxide (ZnO), have been applied in wastewater treatment to convert non-biodegradable TOCs into nontoxic chemicals under UV irradiation [2,3].…”

Section: Introductionmentioning

confidence: 99%

Zinc oxide nanocolloids prepared by picosecond pulsed laser ablation in water at different temperatures

D’Urso

Spadaro

Bonsignore

et al. 2018

EPJ Web of Conferences

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Abstract. Zinc oxide with wide direct band gap and high exciton binding energy is one of the most promising materials for ultraviolet (UV) light-emitting devices. It further exhibits good performance in the degradation of non-biodegradable pollutants under UV irradiation. In this work, zinc oxide (ZnO) and zinc oxide/gold (ZnO/Au) nanocolloids are prepared by picosecond pulsed laser ablation (ps-PLA), using a Zn and Au metallic targets in water media at room temperature (RT) and 80°C. ZnO and Au nanoparticles (NPs) with size in the 10-50 nm range are obtained at RT, while ZnO nanorods (NRs) are formed when water is maintained at 80°C during the ps-PLA process. Au NPs, added to ZnO colloids after the ablation process, decorate ZnO NRs. The crystalline phase of all ZnO nanocolloids is wurtzite. Methylene blue dye is used to investigate the photo-catalytic activity of all the synthesised nanocolloids, under UV light irradiation.

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Remediation of wastewater using various nano-materials

Cited by 549 publications

References 247 publications

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

Recent Advances in the Synthesis of Metal Oxide Nanofibers and Their Environmental Remediation Applications

Synthesis, characterization and catalytic performance of ZnO–CeO2 nanoparticles in wet oxidation of wastewater containing chlorinated compounds

Zinc oxide nanocolloids prepared by picosecond pulsed laser ablation in water at different temperatures

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