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

作　　者：何子林 陈怡曼 王倩芳 何婧 喻宁亚[1] HE Zi-lin;CHEN Yi-man;WANG Qian-fang;HE Jing;YU Ning-ya(National&Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources,Hunan Normal University,Changsha 410081,China)

机构地区：[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

出　　处：《湖南师范大学自然科学学报》2024年第4期113-120,共8页Journal of Natural Science of Hunan Normal University

基　　金：国家自然科学基金资助项目(20803021)。

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3 mg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。A series of Au nanoparticles(AuNPs)/sulfur-containing cellulose composite materials were prepared 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 obtained 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 reduction of 4-nitrophenol(4-NP),the composite catalysts after the oxidative treatments showed good catalytic performances.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 K r as high as 1.941 min-1 and could be reused for 4 times.Also,the above catalysts showed good catalytic performances in reducing 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 

分 类 号：O643.36[理学—物理化学] TB333[理学—化学] X703[一般工业技术—材料科学与工程]