Electrochemical remediation of arsenic and fluoride from water: A review of the current state and future prospects

Islam, Samia

doi:10.1016/j.eti.2023.103148

Cited by 9 publications

(2 citation statements)

References 216 publications

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“…Now, various techniques have been employed for defluorination of water or soil, including phytoremediation [ 14 ], electrodialysis [ 15 ], ion exchange processes [ 16 ], electrocoagulation [ 17 ], and adsorption. Among these methods, adsorption is widely recognized as the most sustainable approach from both technical and economic perspectives due to its high removal efficiencies, ease of operations, low costs, and potential for recovery and regeneration of adsorbent materials [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of swine manure and straw biochars on fluorine adsorption-desorption in soils

Cui,

Zhang,

et al. 2024

PLoS ONE

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With increasing global awareness of soil health, attention must be paid to fluorine exposure in soils, which poses a threat to human health. Therefore, this study aimed to study the fluorine adsorption characteristics of swine manure and straw biochars and their impact on fluorine adsorption-desorption in soil with batch experiments. The biochar samples originated from high-temperature anaerobic cracking of swine manure (350°C, 500°C, and 650°C) and straw (500°C). Results indicated that the adsorption of soil fluorine reached adsorption equilibrium at around 4 h after the mixing of swine manure and straw biochar. Fluorine adsorption kinetics using these biochars conformed to the quasi-two-stage kinetic model. The fluorine adsorption kinetics for biochar-treated soils conformed to the double-constant equation and the Elovich equation, and the soil treated with straw biochar showed the fastest fluorine adsorption rate. The adsorption isotherms of fluorine for biochars and biochar-treated soils could be fitted by the isothermal adsorption model of Langmuir and Freundlich. The maximal equilibrium quantity of fluorine was 73.66 mg/g for swine manure biochar. The soil, adding with 2% of swine manure biochar achieved with showed at 650°C had the smallest adsorption. This study also shows that the adsorption of fluorine by biochar gradually decreased with the increase of pH. Comparing with other factors, the mixture pH with biochars added had a significant effect on fluorine adsorption. The decreased fluorine adsorption capacities for soils treated with swine manure and straw biochars were closely related to the increased pH in soils after adding biochars. Considering the fluorine threat in soil, this study provides a theoretical basis for the application of biochars on soil fluorine adsorption.

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Section: Introductionmentioning

confidence: 99%

Effects of swine manure and straw biochars on fluorine adsorption-desorption in soils

Cui,

Zhang,

et al. 2024

PLoS ONE

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“…Various techniques have been employed for defluorination of water, including coagulation and/or precipitation using alum and lime [11], phytoremediation [12], reverse osmosis [13], nanofiltration [14], electrodialysis [15], ion exchange processes [16], electrocoagulation [17], and adsorption.…”

Section: Introductionmentioning

confidence: 99%

Fluoride Removal from Aqueous Medium Using Biochar Produced from Coffee Ground

et al. 2023

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Low concentrations of fluoride (F−) in drinking water are beneficial for oral health, but the natural occurrence of high F- content has been reported in various groundwater sources, posing a continuous ingestion threat to humans. The utilization of biochar (BC) produced from residual biomass has emerged as a technically, economically, and environmentally sustainable alternative for fluoride removal through adsorption. Therefore, this study aimed to investigate the physicochemical characteristics of BC derived from coffee grounds and the influence of various factors on the adsorption process of F- in aqueous media, including pH, adsorbent dosage, contact time, temperature, and initial F- concentration. The BC exhibited a surface area of 12.94 m2·g−1 and a pore volume of 0.0349 cm3·g−1. The adsorption process was strongly pH dependent, demonstrating a significant decline in performance as pH increased from 2.0 onwards. The majority of F- removal occurred within the first 5 min, reaching adsorption equilibrium after 1 h of testing, regardless of the initial F- concentration employed. The data fitting to the Webber–Morris model indicated a two-step adsorption process on BC, with the first step being external surface sorption and the second step being intra-articular diffusion. The process was determined to be endergonic, and the data satisfactorily matched both the Freundlich and Langmuir models, with a qm of 0.53 mg·L−1 (T = 55 °C), indicating the predominance of physisorption. The findings suggest the potential of coffee grounds for BC production; nevertheless, surface structure modifications are necessary to enhance F− affinity and subsequently improve adsorption capacity.

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Electrospun nanofibers synthesis enhancing the activity of energy storage devices/electrochemical and biosensor applications

Noor,

Saleem,

Furqan Mughal

et al. 2024

Electroanalysis

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Electrochemical remediation of arsenic and fluoride from water: A review of the current state and future prospects

Cited by 9 publications

References 216 publications

Effects of swine manure and straw biochars on fluorine adsorption-desorption in soils

Effects of swine manure and straw biochars on fluorine adsorption-desorption in soils

Fluoride Removal from Aqueous Medium Using Biochar Produced from Coffee Ground

Electrospun nanofibers synthesis enhancing the activity of energy storage devices/electrochemical and biosensor applications

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