摘要
通过直接蒸发法制备载铁活性炭,研究了载铁活性炭对水中P(V)的吸附等温线和吸附热动力学,并分析了pH值、P(V)初始浓度等因素对载铁活性炭吸附性能的影响.实验表明,载铁活性炭可以有效快速地吸附P(V),载铁活性炭对P(V)的去除效果随pH值的上升、P(V)初始浓度的增大而降低.吸附等温线符合Langmuir方程,最大吸附量为9.32 mg/g;准二级动力学能够很好地描述P(V)在载铁活性炭上的吸附行为,吸附速率常数在0.01 min.g/mg左右,且随着温度的升高逐渐增大.吸附P(V)的活化能Ea为10.89 kJ/mol,吸附行为是自发吸热的化学吸附过程.
Iron-supported activated carbon is prepared by iron-salt evaporation method.Its adsorption isotherm and adsorption kinetics,thermodynamics are then investigated.The main factors affecting adsorption,such as pH and initial concentration of P(V) are also studied.The results indicate that the iron-supported activated carbon could effectively adsorb P(V).The removal percentage of P(V) onto iron-supported activated carbon decreases as pH and P(V) initial concentrations increase.The equilibrium data fit the Langmuir equation well,with the maximum adsorption capacity being 9.32 mg/g.The adsorption of P(V) by iron-supported activated carbon follows the pseudo-second-order kinetic model,so adsorption rate constant can be calculated at about 0.01 min·g/mg,which increases with the temperature increase.The activation energy(Ea) for adsorption is calculated to be 10.89 kJ/mol.The adsorption of P(V) on activated carbon is spontaneous,endothermic and chemical.
出处
《昆明理工大学学报（自然科学版）》
CAS
北大核心
2012年第2期72-77,87,共7页
Journal of Kunming University of Science and Technology(Natural Science)
基金
国家洱海水专项(2008ZX07105-006)
关键词
载铁活性炭
P(V)
吸附
动力学
热力学
iron-supported activated carbon
P(V)
adsorption
kinetics
thermodynamics
