A critical review on arsenic removal from water using biochar-based sorbents: The significance of modification and redox reactions

Amen, Rabia; Bashir, Hamna; Bibi, Irshad; Shaheen, Sabry M.; Niazi, Nabeel Khan; Shahid, Muhammad; Hussain, Muhammad Mahroz; Antoniadis, Vasileios; Shakoor, Muhammad Bilal; Al-Solaimani, Samir G.; Wang, Hailong; Bundschuh, Jochen; Rinklebe, Jörg

doi:10.1016/j.cej.2020.125195

Cited by 272 publications

(78 citation statements)

References 133 publications

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“…Recently, biochar has received notable attention as environmentally friendly and effective adsorbents, cost-efficient materials for the remediation treatment of metal(loid)s 26 . Although several studies have documented Sb adsorption to pure minerals 27 , 28 and humic substances 29 , 30 , very few studies of Sb sorption onto biochars have been reported to date 31 , 32 .…”

Section: Introductionmentioning

confidence: 99%

Antimonate sequestration from aqueous solution using zirconium, iron and zirconium-iron modified biochars

Rahman

Sanderson

et al. 2021

Sci Rep

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Antimony (Sb) is increasingly being recognized as an important contaminant due to its various industrial applications and mining operations. Environmental remediation approaches for Sb are still lacking, as is the understanding of Sb environmental chemistry. In this study, biosolid biochar (BSBC) was produced and utilized to remove antimonate (Sb(V)) from aqueous solution. Zirconium (Zr), Zirconium-iron (Zr–Fe) and Fe–O coated BSBC were synthesized for enhancing Sb(V) sorption capacities of BSBC. The combined results of specific surface area, FTIR, SEM–EDS, TEM–EDS, and XPS confirmed that Zr and/or Zr–Fe were successfully coated onto BSBC. The effects of reaction time, pH, initial Sb(V) concentration, adsorbate doses, ionic strength, temperature, and the influence of major competitive co-existing anions and cations on the adsorption of Sb(V) were investigated. The maximum sorption capacity of Zr–O, Zr–Fe, Zr–FeCl3, Fe–O, and FeCl3 coated BSBC were 66.67, 98.04, 85.47, 39.68, and 31.54 mg/g respectively under acidic conditions. The XPS results revealed redox transformation of Sb(V) species to Sb(III) occurred under oxic conditions, demonstrating the biochar’s ability to behave as an electron shuttle during sorption. The sorption study suggests that Zr–O and Zr–O–Fe coated BSBC could perform as favourable adsorbents for mitigating Sb(V) contaminated waters.

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Section: Introductionmentioning

confidence: 99%

Antimonate sequestration from aqueous solution using zirconium, iron and zirconium-iron modified biochars

Rahman

Sanderson

et al. 2021

Sci Rep

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“…Since As(III) is in the form of uncharged H 3 AsO 3 in the pH range of 6-9, where natural waters are most common, it can be removed from water much more difficult and with a lower efficiency than As(V). Therefore, oxidation of As(III) to As(V) takes place as a pretreatment process in most of the methods used for arsenic removal (Weerasundara et al 2021;Amen et al 2020). Many methods such as coagulation (Bora et al 2016;Pallier et al 2010), electrochemical processes (Goren and Kobya 2021;Kobya et al 2020), ion exchange (Lee et al 2017;Urbano et al 2012), membrane filtration (Nguyen et al 2009;Schmidt et al 2016), and adsorption (Das et al 2020) are used for removing arsenic from water in order to prevent the toxic effect on living forms and adverse effects on human health caused by arsenic in water resources.…”

Section: Introductionmentioning

confidence: 99%

Removal of arsenate using graphene oxide-iron modified clinoptilolite-based composites: adsorption kinetic and column study

Baskan

Hadimlioglu²

2021

J Anal Sci Technol

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In this study, graphene oxide (GO), iron modified clinoptilolite (FeZ), and composites of GO-FeZ (GOFeZA and GOFeZB) were synthesized and characterized using SEM, EDS, XRF, FTIR, and pHpzc. The arsenate uptake on composites of GOFeZA and GOFeZB was examined by both kinetic and column studies. The adsorption capacity increases with the increase of the initial arsenate concentration at equilibrium for both composites. At the initial arsenate concentration of 450 μg/L, the arsenate adsorption on GOFeZA and GOFeZB was 557.86 and 554.64 μg/g, respectively. Arsenate adsorption on both composites showed good compatibility with the pseudo second order kinetic model. The adsorption process was explained by the surface complexation or ion exchange and electrostatic attraction between GOFeZA or GOFeZB and arsenate ions in the aqueous solution due to the relatively low equilibrium time and fairly rapid adsorption of arsenate at the beginning of the process. The adsorption mechanism was confirmed by characterization studies performed after arsenate was loaded onto the composites. The fixed-bed column experiments showed that the increasing the flow rate of the arsenate solution through the column resulted in a decrease in empty bed contact time, breakthrough time, and volume of treated water. As a result of the continuous operation column study with regenerated GOFeZA, it was demonstrated that the regenerated GOFeZA has lower breakthrough time and volume of treated water compared to fresh GOFeZA.

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“…Recently, biochar has received notable attention as environmentally friendly and effective adsorbents, costefficient materials for the remediation treatment of metal(loid)s 20 . Although several studies have documented Sb adsorption to pure minerals 21 and humic substances 22 , very few studies of Sb sorption onto biochars have been reported to date 23 .…”

Section: Introductionmentioning

confidence: 99%

Antimonate Sequestration from Aqueous Solution Using Zirconium, Iron and Zirconium-iron Modified Biochars

Rahman

Sanderson

et al. 2021

Preprint

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Antimony (Sb) is increasingly being recognized as an important contaminant due to its various industrial applications and mining operations. Environmental remediation approaches for Sb are still lacking, as is the understanding of Sb environmental chemistry. In this study, biosolid biochar (BSBC) was produced and utilized to remove antimonate (Sb(V)) from aqueous solution. Zirconium (Zr), Zirconium-iron (Zr-Fe) and Fe-O coated BSBC were synthesized for enhancing Sb(V) sorption capacities of BSBC. The combined results of specific surface area, FTIR, SEM-EDS, TEM-EDS, and XPS confirmed that Zr and/or Zr-Fe were successfully coated onto BSBC. The effects of reaction time, pH, initial Sb(V) concentration, adsorbate doses, ionic strength, temperature, and the influence of major competitive co-existing anions and cations on the adsorption of Sb(V) were investigated. The maximum sorption capacity of Zr-O, Zr-Fe, Zr-FeCl3, Fe-O, and FeCl3 coated BSBC were 66.67, 98.04, 85.47, 39.68, and 31.54 mg/g respectively under acidic conditions. The XPS results revealed redox transformation of Sb(V) species to Sb(III) occurred under oxic conditions, demonstrating the biochar’s ability to behave as an electron shuttle during sorption. The sorption study suggest that Zr-O and Zr-O-Fe coated BSBC could perform as favourable adsorbents for mitigating Sb(V) contaminated waters.

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A critical review on arsenic removal from water using biochar-based sorbents: The significance of modification and redox reactions

Cited by 272 publications

References 133 publications

Antimonate sequestration from aqueous solution using zirconium, iron and zirconium-iron modified biochars

Antimonate sequestration from aqueous solution using zirconium, iron and zirconium-iron modified biochars

Removal of arsenate using graphene oxide-iron modified clinoptilolite-based composites: adsorption kinetic and column study

Antimonate Sequestration from Aqueous Solution Using Zirconium, Iron and Zirconium-iron Modified Biochars

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