摘要
The adsorption behavior of the organobentonite (CTMAB-bentonite) modified with dithizone for lead ion in water was investigated.A sort of cheap sorbent was prepared through modifying organobentonite with dithizone and was characterized with FT-IR.By means of flame atomic absorption spectrometry (FAAS), the adsorption situation and mechanism were studied.The results showed that after treating bentonite with cetyl trimethyl ammonium bromide (CTMAB),dithizone could be immobilized on the bentonite firmly.The lead ion in water could be adsorbed quantitatively on the organobentonite modified with dithizone, and the adsorbed quantity was affected by pH value of medium, temperature and time.The adsorption behavior followed a Langmuir adsorption isotherm and a pseudo-second-order kinetic model.The enthalpy change of the adsorption process was 58.432 kJ·mol-1,and Gibbs free energy change was negative at different temperatures.The reaction of adsorption was an spontaneous, endothermal process.
The adsorption behavior of the organobentonite （CTMAB-bentonite） modified with dithizone for lead ion in water was investigated.A sort of cheap sorbent was prepared through modifying organobentonite with dithizone and was characterized with FT-IR.By means of flame atomic absorption spectrometry （FAAS）, the adsorption situation and mechanism were studied.The results showed that after treating bentonite with cetyl trimethyl ammonium bromide （CTMAB）,dithizone could be immobilized on the bentonite firmly.The lead ion in water could be adsorbed quantitatively on the organobentonite modified with dithizone, and the adsorbed quantity was affected by pH value of medium, temperature and time.The adsorption behavior followed a Langmuir adsorption isotherm and a pseudo-second-order kinetic model.The enthalpy change of the adsorption process was 58.432 kJ·mol^-1,and Gibbs free energy change was negative at different temperatures.The reaction of adsorption was an spontaneous, endothermal process.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2008年第6期1535-1540,共6页
CIESC Journal
基金
辽宁省教育厅科学技术研究项目(05L367)
