Global Centre for Environmental Remediation (GCER), The University of Newcastle, Callaghan, Australia.
Department of Public Health Engineering (DPHE), Zonal Laboratory, Khulna, 9100, Bangladesh.
Sci Rep. 2021 Apr 14;11(1):8113. doi: 10.1038/s41598-021-86978-6.
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-FeCl, Fe-O, and FeCl 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.
锑（Sb）由于其各种工业应用和采矿作业而日益被认为是一种重要的污染物。目前仍然缺乏针对 Sb 的环境修复方法，对 Sb 环境化学的了解也有限。在本研究中，生物固体生物炭（BSBC）被制备并用于从水溶液中去除锑酸盐（Sb(V)）。合成了锆（Zr）、锆-铁（Zr-Fe）和 Fe-O 涂层 BSBC，以提高 BSBC 对 Sb(V)的吸附能力。比表面积、FTIR、SEM-EDS、TEM-EDS 和 XPS 的综合结果证实了 Zr 和/或 Zr-Fe 已成功地涂覆到 BSBC 上。考察了反应时间、pH 值、初始 Sb(V)浓度、吸附剂剂量、离子强度、温度以及主要共存竞争阴离子和阳离子对 Sb(V)吸附的影响。在酸性条件下，Zr-O、Zr-Fe、Zr-FeCl、Fe-O 和 FeCl 涂层 BSBC 的最大吸附容量分别为 66.67、98.04、85.47、39.68 和 31.54 mg/g。XPS 结果表明，在有氧条件下，Sb(V)物种发生了向 Sb(III)的氧化还原转化，这表明生物炭在吸附过程中具有充当电子穿梭体的能力。吸附研究表明，Zr-O 和 Zr-O-Fe 涂层 BSBC 可以作为去除 Sb(V)污染水的有利吸附剂。
