摘要
以硅藻土为基体,γ-氨丙基三甲氧基硅烷(APES)作为改性剂,对硅藻土表面进行修饰,制备了针对As(Ⅴ)吸附材料。采用单因素试验法,得到改性的最佳条件为:硅藻土为3 g,γ-氨丙基三甲氧基硅烷(APES)为4 mL,pH值为11,反应时间6 h,反应温度为30℃,该材料对As(Ⅴ)的去除率可以达到87.11%。用扫描电镜(SEM)和傅里叶红外光谱仪(FT-IR)对材料进行表征,显示:改性前后的硅藻整体结构不发生变化;硅藻经改性后活性羟基峰消失,表面生成新的-NH_2吸收峰。用Freundlich吸附模型能更好的描述吸附行为,吸附过程符合准二级动力学方程。
The adsorbent for As ( V ) ion removal was prepared by using diatomite as matrix, γ- propylalkoxysilane ( APES) as the modifier. The highest removal rate of 87. 11% was observed at the optimal modification conditions: modified diatomite 3 g, APES 4 mL, pH = 11, reaction time 6 h, reaction temperature 30 . The scanning electron microscopy ( SEM) observation showed that thediatomite matrix did not change before and after modification. The Fourier transform infrared spectroscopy (FT- IR) analysis proved the disappearance of hydroxyl group and the appearance of -NH2. Besides, the adsorption of As ( V ) ions on adsorbent obeys the Freundlich model and the pseudo second-order equation.
作者
李聪
解庆林
陈南春
钟溢健
梁效铭
LI Cong;XIE Qing-lin;CHEN Nan-chun;ZHON Yi-jian;LIANG Xiao-ming(School of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China)
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2018年第4期1160-1166,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(41662005
51564008)
广西环境污染控制理论与技术重点实验室研究基金(001102216078)
广西科技攻关项目(桂科攻14124004-5-5)