Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan.
J Hazard Mater. 2019 Dec 15;380:120816. doi: 10.1016/j.jhazmat.2019.120816. Epub 2019 Jul 6.
We synthesized three new dithiocarbamate (DTC)-modified cellulose biomaterials (DMC-1, DMC-2, and DMC-4) to investigate their adsorption capabilities as mitigators of arsenite (As) in aqueous media. The main novelty of the adsorbents was that, among two inorganic species of arsenic, arsenite and arsenate (As), DMCs were highly selective to As in the pH range 2-7. The surface areas of the adsorbents were unified by supporting the DMCs on silica gel (designated SSDMC-1, SSDMC-2, and SSDMC-4, respectively) to investigate the effect of the length of the alkyl chains connecting cellulose and DTC groups on As adsorption. The Langmuir model showed a good regression coefficient (R > 0.96), and the isotherm results revealed that longer chains might enhance the As capture ability. The adsorbents were also capable of removing various heavy metals, and the coexisting ions, Fe, Mn, Pb, and Zn, had no significant impact on the removal of As by the DMCs. Moreover, DMC-2 could remove 98.4 ± 0.1% of As from artificially contaminated river water.
我们合成了三种新型的二硫代氨基甲酸盐（DTC）修饰的纤维素生物材料（DMC-1、DMC-2 和 DMC-4），以研究它们在水介质中作为亚砷酸盐（As）缓解剂的吸附能力。这些吸附剂的主要新颖之处在于，在两种砷无机物种中，亚砷酸盐和砷酸盐（As），DMC 在 pH 值为 2-7 的范围内对 As 具有高度选择性。通过将 DMC 负载在硅胶上（分别命名为 SSDMC-1、SS-DMC-2 和 SSDMC-4），使吸附剂的表面积统一，以研究连接纤维素和 DTC 基团的烷基链长度对 As 吸附的影响。Langmuir 模型显示出良好的回归系数（R>0.96），等温线结果表明，较长的链可能会增强 As 的捕获能力。这些吸附剂还能够去除各种重金属，共存的离子 Fe、Mn、Pb 和 Zn 对 DMC 去除 As 没有显著影响。此外，DMC-2 可以从人工污染的河水中去除 98.4±0.1%的 As。
