摘要
采用氨基硅烷偶联剂(γ-氨丙基三乙氧基硅烷)改性凹凸棒石黏土(以下简称"凹土")为吸附剂,通过静态吸附研究其对模拟废水中焦性没食子酸的吸附性能。结果表明,γ-氨丙基三乙氧基硅烷改性凹土能有效提高凹土的吸附性能,改性凹土吸附50 mL,浓度为100 mg/L焦性没食子酸较理想的条件为吸附剂用量0.4 g、吸附温度20℃、吸附时间40min、体系pH 5.2。通过静态吸附实验数据计算分析得知,拟二级动力学模型比拟一级动力学模型能更好地描述改性凹土对焦性没食子酸的吸附动力学行为,改性凹土对焦性没食子酸的吸附更符合Langmuir等温式,其饱和吸附量为19.861 mg/g。
Attapulgite was modified by amino-silane coupling agent （γ-aminopropyltriethoxysilane） to use as adsorbent for the removal of pyrogallol from aqueous solutions. The static adsorption behaviors of pyrogallol in aqueous solution were studied. Results indicated that modified attapulgite could effectively enhance the adsorption properties of attapulgite. The optimum conditions for the amount of the modified attapulgite with 50 mL pyrogallol concentration of 100 mg/L were 0.4 g, the temperature of 20℃ , the time of 40 min and pH of 5.2. The static adsorption kinetics data were better described by the pseudo-second-order kinetic model rather than pseudofirst-order kinetic model. Adsorption equilibrium data are fitted well to the Langmuir isotherm. The maximum adsorption capacity of modified attapulgite calculated bv the Lan^muir model is 19. 861 mg/g.
出处
《环境工程学报》
CAS
CSCD
北大核心
2013年第4期1285-1289,共5页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(21276101,20975043)
江苏省高校自然科学研究重大项目(09KJA530001)
淮安市科技支撑计划(工业)资助项目(HAG2010014,HAG09054-8)
江苏省高校青蓝工程资助
关键词
氨基化凹土
焦性没食子酸
吸附动力学
等温线
amino-terminated attapulgite
pyrogallol
adsorption kinetics
isotherms
