摘要
采用十六烷基三甲基溴化铵(CTMAB)对皂土改性,用丁二酮肟(DMG)对其表面修饰,并制备了新型固态吸附剂.研究了该吸附剂对水中Ni2+的吸附行为.结果表明,该固态吸附剂对水中Ni2+具有较强的吸附能力.吸附量受介质pH值、温度和吸附时间的影响.其吸附行为符合Langmuir吸附等温模型和HO准二级动力学方程,吸附焓变(△H)为58.759kJ/mol,各温度下,吸附自由能变(△G)均<0,熵变(△S)均>0,该吸附反应为吸热的自发过程.吸附了Ni2+的丁二酮肟修饰改性皂土,可用0.1mol/L的HNO3溶液洗脱再生.
A sort of cheap sorbent was prepared through modifying organobentonite with dimethylglyoxime （DMG）. The adsorption behavior of the modified organobentonite with DMG for nickel ion in water was investigated. The nickel ion in water could be adsorbed on the DMG modified organobentonite. The adsorption quantity was affected by the pH value of medium, temperature and time. The adsorption behavior followed Langmuir adsorption isotherm and pseudo-second-order kinetic model. The enthalpy changes （AH） of the adsorption process was 58.759 kJ/mol. At various temperatures, Gibbs free energy changes （AGO were negative, and entropy changes （AS） were positive. The reaction of adsorption was an endothermal and spontaneous process. The nickel ion adsorbed on the sorbent could be completely eluated by using 0.1 mol/L HNO3.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2009年第7期713-717,共5页
China Environmental Science
基金
辽宁省教育厅科学技术研究项目(05L367)
关键词
丁二酮肟(DMG)
修饰
改性皂土
镍
吸附行为
电镀废水
dimethylglyoxime （DMG）
modification： organobentonite
nickel
adsorption behavior
electroplating wastewater
