College of Environmental Natural Resource Sciences, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Hangzhou 310058, China.
School of Environmental and Natural Resources, Zhejiang University of Science and Technology, Hangzhou 310023, China.
Sci Total Environ. 2021 Jan 1;750:141672. doi: 10.1016/j.scitotenv.2020.141672. Epub 2020 Aug 13.
Contaminations by heavy metals in the environment always exist as a mixture of both metal and metalloid. Thus, it is a challenge to simultaneously remove both components due to their adverse chemical behaviors. Herein, effective cadmium (Cd) and arsenic (As) removal in aqueous solution was achieved by use of a novel composite, which was synthesized by Bacillus sp. K1 loaded onto FeO biochar (MBB). The combination with Bacillus sp. K1 provided new biosorption sites such as amine and hydroxyl groups in the composite surface, which significantly increasing the removal capability of Cd(II) by 230% when compared with the raw magnetic biochar. Both competition and synergy effects were found in binary system. Adsorption of As(III) extended active sites for capturing Cd(II), which appeared on the surface of the MBB as type B ternary surface complexes. The maximum adsorption capacity of Cd(II) and As(III) reached 25.04 and 4.58 mg g in a binary system, respectively. In summary, this environmentally friendly composite is promising for simultaneous Cd(II) and As(III) remediation.
在环境中，重金属污染物总是以金属和类金属混合物的形式存在。因此，由于它们的不良化学行为，同时去除这两种成分是一项挑战。在此，通过使用一种新型复合材料 Bacillus sp. K1 负载到 FeO 生物炭（MBB），实现了水溶液中有效去除镉（Cd）和砷（As）。 Bacillus sp. K1 的结合在复合材料表面提供了新的生物吸附位点，如胺基和羟基，与原始磁性生物炭相比，这显著提高了 Cd(II)的去除能力，增加了 230%。在二元体系中发现了竞争和协同作用。As(III)的吸附为捕获 Cd(II)扩展了活性位点，Cd(II)出现在 MBB 的表面上，形成 B 型三元表面配合物。在二元体系中，Cd(II)和 As(III)的最大吸附容量分别达到 25.04 和 4.58 mg g。总之，这种环保型复合材料有望同时用于修复 Cd(II)和 As(III)。
