纳米金/含硫纤维素复合材料的制备及对有机污染物催化还原性能研究
Preparation of Nano-Au/Sulfur-Containing Cellulose Composite Catalysts for Catalytic Reduction of Organic Pollutants
何子林 1陈怡曼 1王倩芳 1何婧 1喻宁亚1
作者信息
- 1. 湖南师范大学石化新材料与资源精细利用国家地方联合工程实验室,中国 长沙 410081
- 折叠
摘要
以硫辛酸改性纤维素,吸附氯金酸,以硼氢化钠还原氯金酸,制备一系列纳米金/含硫纤维素复合材料,然后对所制复合材料进行热及氧化处理得到最终复合催化剂.采用X-射线粉末衍射(XRD)、透射电子显微镜(TEM)、X-射线光电子能谱(XPS)及电感耦合等离子体光谱(ICP-AES)等表征手段对复合催化剂结构及组成进行分析,发现氧化处理使得载体表面金含量提高.在对硝基苯酚(4-NP)催化还原反应中,氧化处理后复合催化剂表现出良好的催化活性.在金负载量为 2%(质量分数),4-NP为 3 mL,硼氢化钠与 4-NP物质的量之比为 400∶1,催化剂质量为 3mg时,表观反应速率常数Kr可达 1.941 min-1,催化剂可重复使用 4 次.此外,该复合催化剂对偶氮及杂环染料也表现出良好的催化还原性能.
Abstract
A series of Au nanoparticles(AuNPs)/sulfur-containing cellulose composite materials were pre-pared by a process involving modification of cellulose using lipoic acid,adsorption of chlorauric acid,and reduction of chlorauric acid by sodium borohydride.Successively,the resultant composite materials were subjected to thermal and oxidative treatments,yielding ultimate AuNP/cellulose composite catalysts.Structures/components of the ob-tained composite catalysts were characterized by powder X-ray diffraction(XRD),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),and inductively coupled plasma spectrometer(ICP-AES).It was found that the oxidative treatments resulted in elevated Au contents on the surface of supports.During the re-duction of 4-nitrophenol(4-NP),the composite catalysts after the oxidative treatments showed good catalytic per-formances.When the dosage of 4-NP was 3 mL,the molar ratio of sodium borohydride to 4-NP was 400∶1,and the dosage of catalyst was 3 mg,the catalyst with an Au content of 2%displayed a reaction rate constant Kr as high as 1.941 min-1 and could be reused for 4 times.Also,the above catalysts showed good catalytic performances in reduc-ing azo/heterocyclic dyes.
关键词
纤维素/硫辛酸/金纳米粒子/对硝基苯酚/催化还原Key words
cellulose/lipoic acid/Au nanoparticles/4-nitrophenol/catalytic reduction引用本文复制引用
基金项目
国家自然科学基金资助项目(20803021)
出版年
2024
NETL
NSTL
万方数据