Photocatalytic Degradation of Toxic Pesticides

Oladipo, Akeem Adeyemi; Gazi, Mustafa; Ifebajo, Ayodeji Olugbenga; Oladipo, Adewale Sulaiman; Ahaka, Edith Odinaka

doi:10.1002/9781119631422.ch4

Cited by 11 publications

(20 citation statements)

References 74 publications

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“…The mean THg content of the sediments in this study is lower than the values registered in other global studies such as 0.265µgg -1 reported by Donkor et al [82] in Pra river (Ghana), 0.7-9.3µgg -1 reported by Ramirez-Requelme et al [83] in Amazon and 0.3-0.9µgg -1 recorded by Feng et al [84] in Shaanxi Province of the Peoples` Republic of China. However, Lasut et al [85] in Indonesia, Pataranawata et al [86] in Thailand, Mohan et al [51] in Nilambur, Kerala-India and Oladipo et al [57] in Manyera river, Nigeria reported lower THg content of sediments of 0.010-0.017, 0.096-0.402, 0.103-0.46, and 0.018µgg -1 respectively which are comparable to the mean THg concentrations recorded in this study. Taylor et al [87] reported that the drainage sediments from upstream of Uvinza on the Malagarasi river (Tanzania) contain THg in the range of 0.17-0.24 µg/kg, which were lower than for sediments from Ilagala with 0.10 to 0.66 mg/kg THg but all higher than the mean THg registered in this study.…”

Section: Mercuric Content Of Sedimentssupporting

confidence: 83%

“…The mean THg content of fish reported in this study is lower than 0.58 ± 0.44µgg -1 mean THg reported by Castilhos et al [92] in fresh water fish from Tatelu gold mining area, Indonesia which recorded more than 45% of the fishes with THg above WHO compliance limit. Oladipo et al [57] reported that fish (Heterotis niloticus) from Manyera river, Nigeria had a THg content of 8.0 × µgg -1 , well lower than is reported in Oreochromis nilotica Linnaeus 1758 (Cichlidae) 10 -3 edible tissues by this study. Mahre et al [58] reported a lower mean THg of to µgg -1 10 -4 10 -3 in fisheries and aquatic life of river Kaduna, Nigeria.…”

Section: Mercuric Content Of Oreochromis Nilotica Linnaeus 1758 (Cichsupporting

confidence: 57%

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Mercuric pollution of surface water, superficial sediments, Nile tilapia (Oreochromis nilotica Linnaeus 1758 [Cichlidae]) and yams (Dioscorea alata) in auriferous areas of Namukombe stream, Syanyonja, Busia- Uganda

Omara

Karungi

Kalukusu

et al. 2019

Preprint

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The mercuric content, pollution and contamination characteristics of water, sediments, edible muscles of a non-piscivorous fish (Oreochromis nilotica Linnaeus 1758 [Cichlidae]) and yams (Dioscorea alata) in mercury-based artisanal and small-scale gold mining (ASGM) impacted Namukombe stream and its propinquity, Busia gold district, Uganda were evaluated. Human health risk assessment from consumption of the fishes and yams as well as dermal contact with sediments from the stream were performed. Forty-eight (48) samples of water (12), sediments (12), fish (12), and yams (12) were taken at intervals of 0, 10, 20 and 30m from up, middle and down sluices of the stream and analyzed for total mercury (THg) using US EPA method 1631. Results showed that water in the stream is polluted with mercury (Hg) in the range of 0.00 to 1.21±0.070mg/L while sediments contain Hg up to 0.14±0.04ugg-1. THg content of the edible muscles of Oreochromis nilotica ranges from 0.00 to 0.11±0.010ugg-1 while yams contain 0.00 to 0.30±0.001ugg-1 of Hg. The estimated daily intakes (EDIs) ranged from 0.0049 to 0.0183ugg-1day-1 and 0.020 to 0.073ugg-1day-1 for fish consumed by adults and children respectively. The corresponding health risk indices (HRIs) ranged from 0.0123 to 0.04576 and 0.05 to 0.183. EDIs were from 0.0042 to 0.1279ugg-1day-1 and 0.013 to 0.394ugg-1day-1 for yams consumed by adults and children respectively. The HRIs recorded were from 0.011 to 0.320 and to 0.033 to 0.985. All the mean THg contents of the investigated matrices were within acceptable WHO/US EPA limits except for water samples. Consumption of yams grown at 0m up sluice of Namukombe stream may pose deleterious health risks as reflected by the HRI of 0.985 being very close to 1.0. From pollution and risk assessments, Hg usage should be delimited in Syanyonja ASGM areas; solutions to abolish mercury based ASGM in the area ought to be sought at its soonest to avert the accentuating health, economic and ecological disaster arising from the continual discharge of Hg into the surrounding areas. Other safe gold recovery methods such as use of borax should be encouraged. Waste management system for contaminated wastewater, used Hg bottles and tailings should be centralized to enable Hg waste management in ASGM areas in Syanyonja.

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Section: Mercuric Content Of Sedimentssupporting

confidence: 83%

Section: Mercuric Content Of Oreochromis Nilotica Linnaeus 1758 (Cichsupporting

confidence: 57%

Mercuric pollution of surface water, superficial sediments, Nile tilapia (Oreochromis nilotica Linnaeus 1758 [Cichlidae]) and yams (Dioscorea alata) in auriferous areas of Namukombe stream, Syanyonja, Busia- Uganda

Omara

Karungi

Kalukusu

et al. 2019

Preprint

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“…The excited electrons will reduce adsorbed pesticides on the surface of the photocatalyst. The most common electron acceptor is the O 2 which gets reduced into the superoxide radical O •− 2 (Equation ( 4)) [40]. These generated hydroxyl radicals and superoxide radical anions are the major oxidizing agents that drive the photocatalytic oxidation processes of the pesticide residues.…”

Section: Resultsmentioning

confidence: 99%

Study of the Photocatalytic Degradation of Highly Abundant Pesticides in Agricultural Soils

2022

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Organic pesticides are major sources of soil pollution in agricultural lands. Most of these pesticides are persistent and tend to bio accumulate in humans upon consumption of contaminated plants. In this study, we investigate different natural soil samples that were collected from agricultural lands. The samples revealed the presence of 18 pesticides that belong to four different groups including organochlorines (OCP), organophosphorus (OPP), carbamates (Carb), and pyrethroids (Pyrth). The photocatalytic degradation of the five most abundant pesticides was studied in the presence and absence of 1% TiO2 or ZnO photocatalysts under UV irradiation at a wavelength of 306 nm. The five abundant pesticides were Atrazine (OCP), Chlorpyrifos methyl (OPP), Dimethoate (OPP), Heptachlor (OCP), and Methomyl (Carb). The results showed that photolysis of all pesticides was complete under UV radiation for irradiation times between 64–100 h. However, both photocatalysts enhanced photocatalytic degradation of the pesticides in comparison with photolysis. The pesticides were photocatalytically degraded completely within 20–24 h of irradiation. The TiO2 photocatalyst showed higher activity compared to ZnO. The organochlorine heptachlor, which is very toxic and persistent, was completely degraded within 30 h using TiO2 photocatalyst for the first time in soil. The mechanism of photocatalytic degradation of the pesticides was explained and the effects of different factors on the degradation process in the soil were discussed.

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“…[ 86 ] The increase in temperature might increase the surface activity of the adsorbent as well as the kinetic energy of the adsorbate, contributing to enhance the removal efficiency. [ 22 ] The positive values of entropy proved the randomness at the solid–liquid interface. [ 87, 88 ]…”

Section: Resultsmentioning

confidence: 99%

“…As such, the scientific community looks for inexpensive adsorbent materials to further reduce the process costs. [ 15 ] The use of low cost materials, such as agrowaste resources, [ 16–19 ] fly ash, [ 20 ] kaolinite, [ 21 ] biochar, [ 22 ] sawdust, [23 ] or natural fibers, [24 ] have already been investigated. Agricultural wastes and cellulosic material are emerging since their great potential for effluents purification as substitutes of high‐cost adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Design of sodium alginate/soybean extract beads loaded with hemp hurd and halloysite as novel and sustainable systems for methylene blue adsorption

Viscusi

Lamberti

Gorrasi

2021

Polymer Engineering & Sci

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This work concerns the fabrication of a green, novel, and sustainable system for the efficient removal of methylene blue from aqueous solutions. The proposed system is obtained by using sodium alginate/soybean extract blend reinforced with hemp hurd from agro-waste resources and halloysite nanotubes (HNTs). The ionotropic gelation methodology, using calcium chloride as a crosslinking agent, was easily applied to obtain composite beads. The adsorption studies were carried out up to 24 h using methylene blue as model system. The effect of HNTs on adsorption capacity was investigated proving that an increase in inorganic filler determined an increase in adsorption capacity from 32 to 49 mg/g by adding 35% wt of HNTs. The experimental data were fitted through four different models, demonstrating that the adsorption phenomenon is described by second-order process. Film diffusion and pore diffusion values were evaluated to better investigate the rate controlling mechanisms. Isotherm studies were then carried out to extrapolate thermodynamic parameters. Finally, a possible mechanism of adsorption was proposed on the basis of chemisorption mechanism. Here, we demonstrate that the proposed novel, inexpensive, and sustainable composite material obtained from agro-waste resources has high efficiency in removing a cationic dye from wastewaters.

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Photocatalytic Degradation of Toxic Pesticides

Cited by 11 publications

References 74 publications

Mercuric pollution of surface water, superficial sediments, Nile tilapia (Oreochromis nilotica Linnaeus 1758 [Cichlidae]) and yams (Dioscorea alata) in auriferous areas of Namukombe stream, Syanyonja, Busia- Uganda

Mercuric pollution of surface water, superficial sediments, Nile tilapia (Oreochromis nilotica Linnaeus 1758 [Cichlidae]) and yams (Dioscorea alata) in auriferous areas of Namukombe stream, Syanyonja, Busia- Uganda

Study of the Photocatalytic Degradation of Highly Abundant Pesticides in Agricultural Soils

Design of sodium alginate/soybean extract beads loaded with hemp hurd and halloysite as novel and sustainable systems for methylene blue adsorption

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