Rapid adsorption of acetochlor and metolachlor from aqueous solution onto solid waste coal fly ash

Dai, Yingjie; Pan, Zhuo; Xing, Chuanming; Chen, Xin; Bai, Junning; Bai, Zhenzhen; Jin, Laiyu; Zhang, Naixin; Jiang, Huating; Tang, Junqian; Gao, Yuewen; Shan, Dexin

doi:10.5004/dwt.2020.26376

Cited by 5 publications

(10 citation statements)

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“…Similarly, Norit CA1 and Norit SX F Cat provided higher metolachlor removal performances, and the results showed that it could be reduced to over 98% with higher than 50 mg/L doses. The results were consistent with the study of Dai et al, 88 that is, acetochlor and metolachlor were removed successfully with the maximum efficiencies of 91.25 and 73.65% for 10 mg/ L coal fly ash, respectively. Similarly, Wang et al 7 and Wang et al 89 reported 96.3 and >97.5% adsorption performances by the activated carbon and modified sorbent for acetochlor, respectively.…”

Section: Adsorption Equilibrium Modelssupporting

confidence: 92%

“…The results were consistent with the study of Dai et al, that is, acetochlor and metolachlor were removed successfully with the maximum efficiencies of 91.25 and 73.65% for 10 mg/L coal fly ash, respectively. Similarly, Wang et al and Wang et al reported 96.3 and >97.5% adsorption performances by the activated carbon and modified sorbent for acetochlor, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Impact of Natural Organic Matter Competition on the Adsorptive Removal of Acetochlor and Metolachlor from Low-Specific UV Absorbance Surface Waters

Yilmaz,

Altiparmak,

Dadaser-Celik

et al. 2023

ACS Omega

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Although activated carbon adsorption is a very promising process for the removal of organic compounds from surface waters, the removal performance for nonionic pesticides could be adversely affected by co-occurring natural organic matter. Natural organic matter can compete with pesticides during the adsorption process, and the size of natural organic matter affects the removal of pesticides, as low-molecular-weight organics directly compete for adsorbent sites with pesticides. This study aims to investigate the competitive impact of low-molecular-weight organics on the adsorptive removal of acetochlor and metolachlor by four commercial powdered activated carbons. The adsorption features of selected powdered activated carbons were evaluated in surface water samples collected from the influent stream of the filtration process having 2.75 mg/L organic matter and 0.87 L/mg-m specific UV absorbance. The adsorption kinetics and capacities were examined by employing pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic models and modified Freundlich and Langmuir isotherm models to the experimental data. The competitive removal of acetochlor and metolachlor in the presence of natural organic matter was evaluated for varied powdered activated carbon dosages on the basis of UV and specific UV absorbance values of adsorbed organic matter. The adsorption data were well represented by the modified Freundlich isotherm, as well as pseudo-second-order kinetics. The maximum organic matter adsorption capacities of the modified Freundlich isotherm were observed to be 120.6 and 127.2 mg/g by Norit SX Ultra and 99.5 and 100.6 mg/g by AC Puriss for acetochlor-and metolachlorcontaining water samples, respectively. Among the four powdered activated carbons, Norit SX Ultra and AC Puriss provided the highest natural organic matter removal performances with 76 and 72% and 71 and 65% for acetochlor-and metolachlor-containing samples, respectively. Similarly, Norit SX Ultra and AC Puriss were very effective for adsorbing aromatic organics with higher than 80% specific UV absorbance removal efficiency. Metolachlor was almost completely removed by higher than 98% by Norit SX Ultra, Norit SX F Cat, and AC Puriss, even at low adsorbent dosages. However, an adsorbent dose of 100 mg/L and above should be added for all powdered activated carbons, except for Norit SX F Cat, for achieving an acetochlor removal performance of higher than 98%. The competition between low-molecular-weight organics (low-specific UV absorbance) and acetochlor and metolachlor was more apparent at low adsorbent dosages (10−75 mg/L).

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Section: Adsorption Equilibrium Modelssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Impact of Natural Organic Matter Competition on the Adsorptive Removal of Acetochlor and Metolachlor from Low-Specific UV Absorbance Surface Waters

Yilmaz,

Altiparmak,

Dadaser-Celik

et al. 2023

ACS Omega

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“…In both types of modified adsorbents (except AC2N), >70% of metolachlor removal was observed with doses of ≥10 mg L −1 . Dai et al 32 . reported a maximum metolachlor removal efficiency of 73.65% with a 10 mg L −1 coal fly ash dose.…”

Section: Resultsmentioning

confidence: 99%

“…In both types of modified adsorbents (except AC2N), >70% of metolachlor removal was observed with doses of ≥10 mg L −1 . Dai et al 32 reported a maximum metolachlor removal efficiency of 73.65% with a 10 mg L −1 coal fly ash dose. Kumar et al 83 noted that the removal efficiencies of alachlor and metolachlor by GAC ranged between 93.8% and 94.2%, and 94.2% and 100%, respectively.…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

“…30 Several adsorption studies on the removal of alachlor, acetochlor, metolachlor and fenthion from water and wastewater were reported in the literature. [32][33][34][35][36][37] However, the presence of natural organic matter (NOM) in water resources may pose complications in the effective removal of pesticides, especially because lowmolecular-weight organics have compelling competitive effects in removing micropollutants through the adsorption process. [38][39][40] The studies on pesticide removal by HNO 3 -and ClSO 3 H-modified AC in the literature are limited.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous removal of mixed pesticides and natural organic matter from surface waters by nitric and chlorosulfonic acid functionalized powdered activated carbon

Aykut‐Senel,

Ozgur,

Bakirdere

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDSeveral studies have addressed the adsorption of pesticides such as alachlor, acetochlor, metolachlor, and fenthion from water and wastewater, yet the interaction of these compounds with natural organic matter (NOM) complicates their effective removal due to competitive adsorption effects. This study aims to fill this gap by exploring the efficacy of nitric acid and chlorosulfonic acid‐modified activated carbons in removing both pesticides and NOM under realistic environmental conditions.RESULTSModifications using nitric acid and chlorosulfonic acid significantly improved the pesticide removal capabilities of Norit SX F Cat (AC1) adsorbents. While both the original and chlorosulfonic acid‐modified adsorbents showed comparable efficacy in pesticide removal, nitric acid‐modified AC Puriss (AC2) adsorbents were less effective. Remarkably, a 100 mg/L dose of both original and modified powdered activated carbons (PACs) removed over 98% of all four pesticides from water samples. Additionally, a lower 25 mg/L dose effectively achieved similar removal rates, demonstrating their utility as feasible options for water treatment.CONCLUSIONModifying powdered activated carbons with nitric acid and chlorosulfonic acid has been proven to enhance their structural and adsorptive properties significantly. These modifications led to improved pesticide removal efficiencies, particularly with the chlorosulfonic acid‐modified PACs, which demonstrated superior performance in adsorption tests. The study also highlighted the competitive adsorption posed by low‐molecular‐weight organic substances in water, which compete with pesticides for active adsorption sites.This article is protected by copyright. All rights reserved.

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Phoshporic acid actived biochar for efficient removal of paclobutrazol and alleviating its phytotoxicity to mung bean

Zhong,

Zhang,

Chen

et al. 2024

Chemical Engineering Science

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Rapid adsorption of acetochlor and metolachlor from aqueous solution onto solid waste coal fly ash

Cited by 5 publications

References 0 publications

Impact of Natural Organic Matter Competition on the Adsorptive Removal of Acetochlor and Metolachlor from Low-Specific UV Absorbance Surface Waters

Impact of Natural Organic Matter Competition on the Adsorptive Removal of Acetochlor and Metolachlor from Low-Specific UV Absorbance Surface Waters

Simultaneous removal of mixed pesticides and natural organic matter from surface waters by nitric and chlorosulfonic acid functionalized powdered activated carbon

Phoshporic acid actived biochar for efficient removal of paclobutrazol and alleviating its phytotoxicity to mung bean

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