摘要
以冬瓜和钛酸四丁酯为原料,采用水热法和冷冻干燥法成功制备出含TiO_2炭气凝胶(WTCA),研究了其对罗丹明B废水的光催化降解性能,并考察了水中常见无机盐离子对其光催化效果的影响。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、拉曼光谱仪(Raman)和荧光光谱仪(FL)等对样品结构和性能进行了表征。XRD、Raman和EDS分析表明复合气凝胶中含有锐钛矿TiO_2和碳元素;SEM和TEM分析表明TiO_2纳米颗粒均匀地负载在具有多级孔洞结构的炭气凝胶的骨架表面;含TiO_2炭气凝胶的光催化活性明显高于纯TiO_2,当负载量达30%时,其对罗丹明B的光催化降解效率最高(降解率达96.11%)。此外,无机盐阴离子对复合气凝胶的光催化效果有一定的抑制作用(CO_3^(2-)>SO_4^(2-)>Cl^->NO_3^-),而无机盐阳离子Na^+、K^+、Ca^(2+)和Mg^(2+)的抑制作用不明显。
Wintermelon-based TiO2 carbonaceous aerogel（WTCA） composites were prepared by hydrothermal reaction and freeze drying process with wintermelon and tetrabutyl titanate as precursor. The Rhodamine B （RhB） wastewater was photodegraded by WTCA under visible light irradiation. The effects of various common inorganic salt ions in water on the photodegradation were also studied systematically. The morphology structure and properties of as-prepared samples were characterized by using X-ray diffraction（ XRD ）, scanning electron microscopy （ SEM ）, transmission electron microscopy （ TEM ）, Raman spectrometer, and fluorescence spectroscopy（FL）. XRD,Raman and EDS analysis results showed that anatase titanium oxide and carbon element appeared in the WTCA. SEM and TEM analysis results showed that TiO2 nanoparticles were homogeneously anchored on the skeleton surface of hierarchical carbonaceous aerogels. Meanwhile the composite aerogels exhibited better photodegradation capacities for the RhB than pure TiO2. The photocatalytic effect of WTCA had the best photocatalytic efficiency（96.11%） when TiO2 load up to 30 %. Moreover, the inorganic salt anion ions had the negative effect on photodegradation effect with the order of CO23-〉SO24-〉CI-〉NO-3 while the inhibitory effects of cationic ions（ Na＋, K＋ ,Ca2＋ and Mg2＋） were not obvious.
作者
魏巍
曾黔
陆俊炜
韩合坤
朱建军
谢吉民
WEI Wei CENG Qian LU Junwei HAN Hekun ZHU Jianjun XIE Jimin(Center of Analysis and Test,Jiangsu University, Zhenjiang 212013, China School of Chemistry and Chemical Engineering,Jiangsu University, Zhenjiang 212013, China)
出处
《生物质化学工程》
CAS
北大核心
2017年第3期7-13,共7页
Biomass Chemical Engineering
基金
国家自然科学青年基金资助项目(51402130)
中国博士后科学基金资助项目(2016M590421)
关键词
冬瓜基炭气凝胶
二氧化钛
光催化活性
无机盐离子
wintermelon-based carbonaceous aerogels
TiO2
photodegradation efficiency
inorganic salt ions
