TiO2 supported over porous silica photocatalysts for pesticide degradation using solar light: Part 2. Silica prepared using acrylic acid emulsion

Sharma, Mangalampalli V. Phanikrishna; Kumari, V. Durga; Subrahmanyam, M.

doi:10.1016/j.jhazmat.2009.10.056

Cited by 32 publications

(6 citation statements)

References 20 publications

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“…Immobilization of photocatalysts over porous materials features the advantages of increased active surface area, improved mass transfer, and recycling efficiency, as well as reduced charge carrier recombination. The performances of various porous (nano)silica-supported catalysts for photodegradation of pesticides are listed in Table , including semiconductor oxides TiO 2 , − Co 3 O 4 , − and WS 2 and their doping materials, metallophthalocyanines, , polyoxometalates (POMs), halogenated porphyrins, and phosphotungstic acid . The photocatalytic experiments were conducted under ultraviolet and/or visible light irradiation, emitted by mercury vapor lamps, daylight lamps, or natural solar light.…”

Section: Safe Pesticide Applicationmentioning

confidence: 99%

“…Typical examples of semiconductors are TiO 2 and Co 3 O 4 . Subrahmanyam’s group dispersed TiO 2 over porous (nano)silicas and investigated their high activity for the degradation of the herbicide isoproturon, the insecticide imidacloprid, and the non-cumulative organophosphorus pesticide phosphamidon under solar light. − Mesoporous SBA-15 has been decorated with different amounts of TiO 2 through a sol–gel process or post-synthesis hydrolysis approach to degrade amicarbazone and dimethoate, respectively. The hydroxyl radicals were found to be the key active oxidizers in the degradation process of amicarbazone.…”

Section: Safe Pesticide Applicationmentioning

confidence: 99%

See 1 more Smart Citation

Multiple Roles of Mesoporous Silica in Safe Pesticide Application by Nanotechnology: A Review

Kong

Zhang

Wang

2021

J. Agric. Food Chem.

119

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Pollution related to pesticides has become a global problem due to their low utilization and non-targeting application, and nanotechnology has shown great potential in promoting sustainable agriculture. Nowadays, mesoporous silica-based nanomaterials have garnered immense attention for improving the efficacy and safety of pesticides due to their distinctive advantages of low toxicity, high thermal and chemical stability, and particularly size tunability and versatile functionality. Based on the introduction of the structure and synthesis of different types of mesoporous silica nanoparticles (MSNs), the multiple roles of mesoporous silica in safe pesticide application using nanotechnology are discussed in this Review: (i) as nanocarrier for sustained/ controlled delivery of pesticides, (ii) as adsorbent for enrichment or removal of pesticides in aqueous media, (iii) as support of catalysts for degradation of pesticide contaminants, and (iv) as support of sensors for detection of pesticides. Several scientific issues, strategies, and mechanisms regarding the application of MSNs in the pesticide field are presented, with their future directions discussed in terms of their environmental risk assessment, in-depth mechanism exploration, and cost−benefit consideration for their continuous development. This Review will provide critical information to related researchers and may open up their minds to develop new advances in pesticide application.

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Section: Safe Pesticide Applicationmentioning

confidence: 99%

Section: Safe Pesticide Applicationmentioning

confidence: 99%

Multiple Roles of Mesoporous Silica in Safe Pesticide Application by Nanotechnology: A Review

Kong

Zhang

Wang

2021

J. Agric. Food Chem.

119

View full text Add to dashboard Cite

show abstract

“…Migration of pesticides to ground water and surface water is hazardous to aquatic and human lives and is considered toxic, bioaccumulative and carcinogenic in nature. Various conventional methods have been employed to destroy these chemicals, but the pesticides are not degraded completely; instead, these methods transform the phase of the pollutants (Phanikrishna Sharma et al 2010). Nanophotocatalysis proved to be an efficient technology for the treatment of water contaminated by pesticides.…”

Section: Degradation Of Pesticidesmentioning

confidence: 99%

Advanced approach for degradation of recalcitrant by nanophotocatalysis using nanocomposites and their future perspectives

Padmanaban¹,

Nandagopal

Priyadharshini³

et al. 2016

Int. J. Environ. Sci. Technol.

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Industrial effluents containing persistent pollutants play a significant role in environmental pollution. Classical techniques such as chlorination, coagulation, ion flotation, membrane process and sedimentation that have been used to decontaminate polluted water are incapable of efficient degradation due to the generation of secondary pollutants. Photocatalysis, an advanced oxidation process in which the photoreaction is accelerated by the irradiation of catalyst, has shown efficient degradation of recalcitrant in water system. Usage of nanoparticles as homogenous photocatalyst has become prevalent due to their improved properties such as large surface-to-volume ratio, controlled uniform particle size and its composition which enhances the degradation rate. The recombination of holes and electron pair which is considered to be the limitation in homogenous system can be overcome by nanocomposites or heterogeneous photocatalysts. This system decreases the rate of recombination, leading to effective degradation of individual pollutants because of their enhanced physicochemical and structural properties. In recent years, heterogeneous nanophotocatalytic processes employing titanium dioxide (TiO 2 ) and zinc oxide (ZnO) composites have gained immense research interest as an effective wastewater treatment method because of its efficacy in decomposing and mineralizing the hazardous organic and inorganic pollutants utilizing the UV and visible photons.This paper reviews about the process, synthesis and parameters influencing photocatalytic reaction and their kinetics with much emphasize on types of nanoparticles and nanocomposites and its application in wastewater treatment.

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“…Specific focus has been placed on the degradation of phenylurea herbicides, e.g. isoproturon (IPU), that are widely used for the growth control of most broad-leaved weeds and annual grasses, although they are toxic and generate hazardous chemicals contaminating water streams [11][12][13][14]. IPU has unfortunately a relatively high solubility in water and low (bio)chemical degradation rates (time to 25% dissipation between 1 to 13 weeks [15][16][17]) and is therefore easily leached in water bodies [18].…”

Section: Introductionmentioning

confidence: 99%

“…The non-biodegradability of IPU combined with the knowledge that it cannot be completely removed by conventional methods such as treatment with activated carbon opened up the world of AOP research for waste water purification [4,8,11,12]. Especially the use of heterogeneous catalysts in AOPs, e.g.…”

Section: Introductionmentioning

confidence: 99%

Degradation kinetics of isoproturon and its subsequent products in contact with TiO2 functionalized silica nanofibers

Loccufier

Deventer

Manhaeghe

et al. 2020

Chemical Engineering Journal

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A challenge for the photodegradation of (organic) micro-pollutants in waste water treatment is the mechanistic and kinetic understanding beyond the degradation of the initial (parent) harmful product, e.g. the phenylurea herbicide isoproturon (IPU). By combining liquid chromatography mass spectrometry and kinetic Monte Carlo modeling, we demonstrate that upon optimizing the dip-coating conditions (0.34 mol L -1 TiO2 solution at a coating speed of 160 mm min -1 ) for the functionalization of a superhydrophilic electrospun silica nanofibrous membrane (i) hydroxylation is a dominant reaction pathway and (ii) once IPU reacts on the surface of the TiO2 nanoparticles, further hydroxylation occurs sufficiently fast, with complete IPU removal under the detection limit (5-10 mg Lsolution -1 ) as a result of UV irradiation within 8 hours. As hydroxylation is dominant, degradation intermediates with a higher water solubility are formed and therefore a decreased toxicity is obtained upon reintroducing the treated solution into the environment. This is confirmed by respirometry, with an increase in the oxygen uptake rate of an activated sludge from 5.9 mg O2 gactivated sludge -1 h -1 for an untreated 10 mg L -1 IPU solution to 8.2 mg O2 gactivated sludge -1 h -1 for a solution irradiated for 8 hours, in line with a blank solution.

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TiO2 supported over porous silica photocatalysts for pesticide degradation using solar light: Part 2. Silica prepared using acrylic acid emulsion

Cited by 32 publications

References 20 publications

Multiple Roles of Mesoporous Silica in Safe Pesticide Application by Nanotechnology: A Review

Multiple Roles of Mesoporous Silica in Safe Pesticide Application by Nanotechnology: A Review

Advanced approach for degradation of recalcitrant by nanophotocatalysis using nanocomposites and their future perspectives

Degradation kinetics of isoproturon and its subsequent products in contact with TiO2 functionalized silica nanofibers

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