School of Chemistry and Materials Engineering, Changshu Institute of Technology, No. 99, South 3rd Ring Road, Changshu 215500, China; Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu 215500, China; School of Chemical Engineering & Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.
School of Chemistry and Materials Engineering, Changshu Institute of Technology, No. 99, South 3rd Ring Road, Changshu 215500, China.
Ecotoxicol Environ Saf. 2021 Apr 15;213:112003. doi: 10.1016/j.ecoenv.2021.112003. Epub 2021 Feb 12.
A green rust-coated expanded perlite (GR-coated Exp-p) microelectrode was synthesized and incorporated into a column-mode three-dimensional electrokinetic (3D-EK) platform to effectively pursue a continuous Cr(VI) removal from the aqueous solution. Brucite-like layers of GR were decorated onto the Exp-p material. The molar ratio of Fe(II) to Fe(III) played a most vital role among the three synthesis factors in influencing the performance of the particle electrode. For the equilibrium adsorption experiments, the target maximum adsorption capacity of 122 mg/g was predicted by a target optimizer and desirability function at the conditions following the pH of 4.7, the initial concentration of 172.4 mg/L, the dosage of 0.28 g/L, and the temperature of 28.96 °C, respectively. SO, Cl, and NO fiercely competed with Cr(VI) anions in the acidic conditions for the locally positive sites. A low concentration and a slow flow were favored in the column-mode 3D-EK platform. The pseudo-first-order and Langmuir models were suitable for describing the kinetics and isotherms of the adsorption process, respectively. Cr(VI) anions were electrostatically attracted to the silanol groups and GR surface of the adsorbent, subsequently reduced in both heterogeneity and homogeneity, and finally immobilized by coordinating with silanediol groups and silanetriol groups.
一种绿色铁锈涂层膨胀珍珠岩（GR 涂层 Exp-p）微电极被合成并纳入柱式三维电动（3D-EK）平台，以有效地从水溶液中连续去除六价铬。GR 的水镁石状层被修饰在 Exp-p 材料上。在三个合成因素中，Fe(II)与 Fe(III)的摩尔比在影响颗粒电极性能方面起着最重要的作用。对于平衡吸附实验，在 pH 值为 4.7、初始浓度为 172.4 mg/L、用量为 0.28 g/L 和温度为 28.96°C 的条件下，目标优化器和适宜性函数预测目标最大吸附容量为 122mg/g。因此，在酸性条件下，SO、Cl 和 NO 与 Cr(VI)阴离子一起激烈争夺局部正位。在柱式 3D-EK 平台中，低浓度和低流速是有利的。准一级和 Langmuir 模型分别适用于描述吸附过程的动力学和等温线。Cr(VI)阴离子被静电吸引到吸附剂的硅醇基团和 GR 表面，随后在非均相和均相中被还原，最后通过与硅醇基团和硅三醇基团配位而固定。
