School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China.
J Environ Sci (China). 2020 Oct;96:186-193. doi: 10.1016/j.jes.2020.03.060. Epub 2020 May 30.
A new calcium-modified and starch-stabilized ferromanganese binary oxide (Ca-SFMBO) sorbent was fabricated with different Ca concentrations for the adsorption of arsenic (As) and cadmium (Cd) in water. The maximum As(III) and Cd(II) adsorption capacities of 1% Ca-SFMBO were 156.25 mg/g and 107.53 mg/g respectively in single-adsorption systems. The adsorption of As and Cd by the Ca-SFMBO sorbent was pH-dependent at values from 1 to 7, with an optimal adsorption pH of 6. In the dual-adsorbate system, the presence of Cd(II) at low concentrations enhanced As(III) adsorption by 33.3%, while the adsorption of As(III) was inhibited with the increase of Cd(II) concentration. Moreover, the addition of As(III) increased the adsorption capacity for Cd(II) up to two-fold. Through analysis by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR), it was inferred that the mechanism for the co-adsorption of Cd(II) and As(III) included both competitive and synergistic effects, which resulted from the formation of ternary complexes. The results indicate that the Ca-SFMBO material developed here could be used for the simultaneous removal of As(III) and Cd(II) from contaminated water.
一种新型的钙改性和淀粉稳定的铁锰二元氧化物（Ca-SFMBO）吸附剂，具有不同的钙浓度，用于水中砷（As）和镉（Cd）的吸附。在单一吸附体系中，1% Ca-SFMBO 对 As(III)和 Cd(II)的最大吸附容量分别为 156.25 mg/g 和 107.53 mg/g。Ca-SFMBO 吸附剂对 As 和 Cd 的吸附受 pH 值影响，在 pH 值为 1 至 7 的范围内，最佳吸附 pH 值为 6。在双吸附质体系中，低浓度的 Cd(II)存在时，As(III)的吸附量增加了 33.3%，而随着 Cd(II)浓度的增加，As(III)的吸附受到抑制。此外，As(III)的加入使 Cd(II)的吸附容量增加了一倍。通过 X 射线光电子能谱（XPS）和傅里叶变换红外光谱（FTIR）分析，推断 Cd(II)和 As(III)的共吸附机制包括竞争和协同作用，这是由于形成了三元配合物。结果表明，本研究开发的 Ca-SFMBO 材料可用于同时去除受污染水中的 As(III)和 Cd(II)。
