改性水滑石的制备及其光催化性能研究
石家庄学院, 化工学院, 石家庄市低碳能源材料重点实验室, 环境催化及清洁技术研究创新中心, 河北石家庄 050035
| 摘 要： | 本文采用水热法制备镁铝水滑石（MgAl-LDH），并在此基础上用碳酸氧铋（Bi2O2CO3）对MgAl-LDH表面修饰，以便得到Bi2O2CO3/MgAl-LDH复合光催化材料；利用XRD、SEM和紫外-可见漫反射等对制备样品的组成、形貌结构和禁带宽度等表征分析；通过降解亚甲基蓝溶液（MB）对Bi2O2CO3/MgAl-LDH复合光催化材料在自然光下的降解能力进行测试。结果表明：当Bi2O2CO3的修饰量为10%时，复合物的光催化性能最好，在自然光（卤钨灯）下2 h内对MB的降解率高达92%；淬灭实验证明复合光催化剂在对MB的降解过程中参与反应的主要活性物种为超氧自由基（•O2-）；循环试验证明复合光催化剂在5次循环之后依然具有一定的光催化降解能力；最后结合实验数据和表征结果对Bi2O2CO3/MgAl-LDH在自然光下降解染料废水的电荷转移过程和作用机制进行了探索。 |
| 关 键 词： | MgAl-LDH; Bi2O2CO3; 自然光; 光催化; 降解 |
| DOI： | 10.57237/j.cse.2024.03.001 |
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收稿日期: 2024-07-12
接受日期: 2024-08-16
在线出版日期: 2024-09-09
Preparation and Photocatalytic Performance of Modified Hydrotalcite
Environmental Catalysis and Clean Technology Research and Innovation Center, Shijiazhuang Key Laboratory of Low Carbon Energy Materials, School of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, China
| Abstract: | MG-Al hydrotalcite (MgAl-LDH) was prepared by hydrothermal method, and MgAl-LDH was modified with bismuth oxycarbonate (Bi2O2CO3) in order to obtain Bi2O2CO3/MgAl-LDH composite photocatalytic material. The composition, morphology and band gap of the prepared samples were characterized by XRD, SEM and UV-VIS diffuse reflection. The degradation ability of Bi2O2CO3/MgAl-LDH composite photocatalytic material was tested by degradation methylene blue solution (MB) under natural light. Results: When the modification amount of Bi2O2CO3 was 10%, the photocatalytic performance of the complex was the best, and the degradation rate of MB was as high as 92% in 2 h under natural light (tungsten halogen lamp). The quenching experiments showed that the main active species involved in the degradation of MB were superoxide free radicals (•O2-). Cyclic tests show that the composite photocatalyst still has a certain photocatalytic degradation ability after 5 cycles. Finally, the charge transfer process and mechanism of Bi2O2CO3/MgAl-LDH were investigated by using the experimental data and characterization results. |
| Keywords: | MgAl-LDH; Bi2O2CO3; Natural Light; Photocatalysis; Degradation |
基金
| 1. | 石家庄学院2024年大学生创新创业训练计划项目 (SCXM0062) |
参考文献
| [1] | 宋小伟. 有机污染物降解方法研究 [J]. 山西化工, 2022, 42(03): 356-357. |
| [2] | 韩媛媛. 水滑石类光催化剂的制备及其印染废水处理性能研究 [D]. 山东: 青岛科技大学, 2019. |
| [3] | 毛一铮. 光催化技术在室内空气净化中的研究进展 [J]. 山西化工, 2024, 44(03): 30-32. |
| [4] | 张灏昱, 张霞, 彭利满, 等. 复合半导体纳米材料在光催化领域应用的研究进展 [J]. 现代化工, 2023, 43(S2): 36-41+47. |
| [5] | Feitknecht W. The formation of double hydroxides between bivalent and trivalent metals [J]. Helvetica. Chimica. Acta, 1942, 25: 555-569. |
| [6] | 陈博, 郭俊伟, 肖尧, 等. 水滑石类材料光催化降解有机污染物研究进展 [J]. 科技创新与生产力, 2023, 44(08): 71-73. |
| [7] | 路绍琰, 田欣霞, 骆碧君, 等. 水滑石的改性研究概况及发展趋势 [J]. 盐科学与化工, 2023, 52(07): 13-17. |
| [8] | 刘春英, 柳云骐, 王健, 等. 片状水滑石的水热合成及表征[J]. 材料导报, 2013(2): 3. |
| [9] | 吴青山, 赵鹏程, 刘志启, 等. 镁铝水滑石的制备与应用研究[J]. 材料导报, 2022, 36(S1): 149-156. |
| [10] | 孙玉. 低温等离子体处理印染废水的效能及机理研究[D]. 上海: 东华大学, 2016. |
| [11] | Xu Xiaoxiang, Randorn C, Efstathiou P, et al. A red metallic oxide photocatalyst [J]. Nature Materials, 2012, 11(7), 595–598. |
| [12] | McMahon J M, Schatz G C, Gray S K. et al. Plasmonics in the ultraviolet with the poor metals Al, Ga, In, Sn, Tl, Pb, and Bi [J]. Physical Chemistry Chemical Physics, 2013, 15(15): 5415-5423. |
| [13] | Niu Lishan, Hu Yulu, Hu Heping, et al. Kitchen-waste-derived biochar modified nanocomposites with improved photocatalytic performances for degrading organic contaminants [J]. Environmental Research, 2022, 214: 114068. |
| [14] | Dong Fan, Xiong Ting, Sun Yanjuan, et al. A semimetal bismuth element as a direct plasmonic photocatalyst [J]. Chemical Communications. 2014, 50(72): 10386-10389. |
