摘要
用共沉淀法制备了SiO2负载无定形磷酸氢钛材料(TiP/SiO2),用于去除废水中的Pb(II)。通过不同温度、pH和时间条件研究分析TiP/SiO2对Pb(II)吸附的影响因素。结果表明,TiP/SiO2对Pb(II)的吸附量随着pH的增加而增加;其动力学过程符合Lagergren准二级模型,平衡时间为2 h;等温吸附符合Freundlich模型;实验计算所得的热力学参数显示,该吸附过程是自发的吸热过程;D-R模型拟合参数表明,该吸附主要以离子交换为主。
Amorphous titanium （Ⅳ） hydrogen phosphate was immobilized on SiO2 with co-precipitation method. The as-prepared material was used as adsorbent for the removal of Pb（Ⅱ） from aqueous solution. Effects of pH,reaction temperature and time on the adsorption were studied. The results showed that the adsorption in- creases with the increase of pH. The equilibrium time was 2 h and the sorption process followed pseudo-second- order kinetics well. Isothermal adsorption data fitted Freundlich better than Langmuir. Analysis of thermodynamic parameters indicated a spontaneous and endothermic nature. Conclusion can be drawn from D-R model study that the adsorption mechanism was mainly in the form of ion exchange.
出处
《环境工程学报》
CAS
CSCD
北大核心
2014年第4期1510-1514,共5页
Chinese Journal of Environmental Engineering
基金
江苏高校优势学科建设工程项目
江苏省自然科学基金青年基金资助项目(BK2011399)
关键词
磷酸氢钛
吸附
铅
热力学
titanium （Ⅳ） hydrogen phosphate
adsorption
lead
thermodynamics
