| 纳米级Pd/Fe@SiO2复合颗粒对2,4-DCP的还原脱氯研究 |
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| 引用本文： | 杨鑫宇,吴杰,解帅,吴纯鑫,张建庭,赵德明.纳米级Pd/Fe@SiO2复合颗粒对2,4-DCP的还原脱氯研究[J].环境科学学报,2019,39(11):3794-3801. |
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| 作者姓名： | 杨鑫宇 吴杰 解帅 吴纯鑫 张建庭 赵德明 |
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| 作者单位： | 浙江工业大学化学工程学院,杭州,310014;浙江工业大学化学工程学院,杭州,310014;浙江工业大学化学工程学院,杭州,310014;浙江工业大学化学工程学院,杭州,310014;浙江工业大学化学工程学院,杭州,310014;浙江工业大学化学工程学院,杭州,310014 |
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| 基金项目： | 浙江省自然科学基金（No.LY19B070006） |
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| 摘 要： | 为有效抑制纳米级Pd/Fe颗粒的团聚和钝化及改善其表面特性,将纳米SiO_2包覆在Pd/Fe颗粒表面,超声波辐照下液相还原法制备纳米级Pd/Fe@SiO_2复合颗粒,采用TEM、SEM、XRD、EDX及BET表征其物性,以2,4-二氯苯酚(2,4-DCP)为目标污染物,探究其对2,4-DCP的还原脱氯影响因素、降解机理和动力学,结果表明:制备的纳米级颗粒粒径均匀、分散性好,比表面积大;体系中纳米级Pd/Fe投加量、钯化率、TEOS投加量、反应温度及溶液初始pH均会对2,4-DCP的降解效果产生明显影响;并推测出纳米级Pd/Fe@SiO_2复合颗粒对2,4-DCP的降解机理即快速吸附—逐步脱氯—最终脱附释放,其降解符合拟一级动力学关系.
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| 关 键 词： | 超声波 2 4-二氯苯酚 纳米级Pd/Fe@SiO2复合颗粒 还原脱氯 反应动力学 |
| 收稿时间： | 2019/4/8 0:00:00 |
| 修稿时间： | 2019/5/22 0:00:00 |
Reductive dechlorination of 2,4-DCP by Pd/Fe@SiO2 nanocomposites |
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| YANG Xinyu,WU Jie,XIE Shuai,WU Chunxin,ZHANG Jianting and ZHAO Deming.Reductive dechlorination of 2,4-DCP by Pd/Fe@SiO2 nanocomposites[J].Acta Scientiae Circumstantiae,2019,39(11):3794-3801. |
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| Authors: | YANG Xinyu WU Jie XIE Shuai WU Chunxin ZHANG Jianting and ZHAO Deming |
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| Affiliation: | College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014,College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014,College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014,College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014,College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014 and College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014 |
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| Abstract: | To inhibit the agglomeration and passivation of Pd/Fe nanoparticles and improve its surface properties, nano-SiO2 coated Pd/Fe particles (Pd/Fe@SiO2 nanocomposites) were prepared via a facile liquid phase reductive method with the aid of ultrasound irradiation, and were characterized by TEM, SEM, XRD, EDX, and BET. Thereafter, the catalytic performance of Pd/Fe@SiO2 was checked using the model reaction of 2,4-dichlorophenol (2,4-DCP) dechlorination, wherein the influential factors, degradation kinetics, and reaction mechanism were investigated. It can be found that:1) the highly dispersed, with uniform size and large surface area of Pd/Fe@SiO2 catalyst could be accounted for the superior activity of 2,4-DCP dechlorination; 2) several factors such as Pd/Fe nanoparticles dosage, palladium content, TEOS dosage, reaction temperature and initial pH significantly affect the degradation of 2,4-DCP; 3) the degradation of 2,4-DCP by Pd/Fe@SiO2 nanocomposites is rapid adsorption-gradual dechlorination-final desorption. following pseudo-first-order kinetics. |
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| Keywords: | ultrasound Pd/Fe@SiO2 nanocomposites 2 4-dichlorophenol reductive dechlorination kinetics |
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