Zhang Jun, Wei Xuxu, Zhang Zifan, Yuan Caixia, Huo Ting, Niu Fangfang, Lin Xiaoyu, Liu Chunli, Li Hui, Chen Zhenbin
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology Lanzhou 730050 Gansu China
School of Materials Science and Engineering, Lanzhou University of Technology Lanzhou 730050 Gansu China.
RSC Adv. 2023 Mar 7;13(11):7392-7401. doi: 10.1039/d3ra00492a. eCollection 2023 Mar 1.
A magnetic chitosan/TiO composite material (MCT) was developed. MCT was successfully synthesized by a one-pot method using chitosan, TiO, and FeO. The absorption equilibrium time of MCT was 40 min in absorbing vanadium(v), the optimal adsorption pH was 4, and the maximum adsorption capacity of vanadium(v) was 117.1 mg g. The spent MCT was applied to photocatalytic reactions for reutilization. The decolorization rates for the degradation of rhodamine B (RhB) by new and spent MCT were 86.4% and 94.3%, respectively. The new and spent MCT exhibited absorption bands at 397 and 455 nm, respectively, which showed that the spent MCT was red-shifted to the cyan light region. These results indicated that the forbidden band widths of the new and spent MCT were about 3.12 and 2.72 eV, respectively. The mechanism of the degradation reaction showed that the hydroxyl radicals as oxidants in the spent MCT mediated the photocatalytic degradation of RhB. In addition, the superoxide anion radical formation of hydroxyl radicals was the main reaction, and the hole generation of hydroxyl radicals was the subordinate reaction. The -de-ethylated intermediates and organic acids were monitored by MS and HPLC.
开发了一种磁性壳聚糖/TiO复合材料（MCT）。采用壳聚糖、TiO和FeO通过一锅法成功合成了MCT。MCT对钒（V）的吸附平衡时间为40分钟，最佳吸附pH值为4，钒（V）的最大吸附容量为117.1毫克/克。将用过的MCT应用于光催化反应以进行再利用。新的和用过的MCT对罗丹明B（RhB）降解的脱色率分别为86.4%和94.3%。新的和用过的MCT分别在397和455纳米处显示出吸收带，这表明用过的MCT发生了红移至青光区域。这些结果表明，新的和用过的MCT的禁带宽度分别约为3.12和2.72电子伏特。降解反应机制表明，用过的MCT中作为氧化剂的羟基自由基介导了RhB的光催化降解。此外，羟基自由基形成超氧阴离子自由基是主要反应，羟基自由基产生空穴是次要反应。通过质谱和高效液相色谱监测去乙基化中间体和有机酸。
