改性超细粉煤灰吸附Cr^(6+)动力学研究  

Study on kinetics of Cr^(6+) adsorption on modified ultrafine coal fly ash

作　　者：刘转年[1] 王贵荣[1] 

机构地区：[1]西安科技大学地质与环境学院,陕西西安710054

出　　处：《辽宁工程技术大学学报（自然科学版）》2009年第5期827-830,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：中国博士后科学基金基金项目(20070411124);陕西省工业攻关项目(2006k07-G19);陕西省教育厅产业化培育项目(06JC11)

摘　　要：将三种粉煤灰球磨后得到超细粉煤灰,选择采用HCl、H2SO4、NaOH、Ca(OH)2和Na2CO3等对超细粉煤灰进行化学改性,结果表明采用Ca(OH)2改性效果最好,经过改性以后三种超细粉煤灰对Cr6+的去除率提高2.01～2.44倍。研究了Ca(OH)2改性超细粉煤灰对Cr6+的吸附动力学和浓度和pH值对吸附的影响。动力学研究表明,三种改性超细粉煤灰对Cr6的吸附过程符合二级吸附动力学,吸附为颗粒内扩散控制过程。溶液浓度增加,去除率降低;pH<6时,Cr6+的去除率pH值的增加而增加,pH>6时,去除率减小。Three types of ultrafine coal fly ashes were obtained by ball milling raw coal fly ashes collected from three coal-fired power plants.HCl、H2SO4、NaOH、Ca（OH）2 and Na2CO3 were added into ultrafine coal fly ashes.The results showed that Ca（OH）2 is the most effective modifier.Comparing with ultrafine coal fly ashes,the removal rates of Cr6＋ in three modified ultrafine coal fly ashes increase 2.01～2.44 times.Also,the effect of concentration and pH on adsorption and adsorption kinetics were investigated.Adsorption kinetics indicated that the adsorption of Cr6＋ in three types of modified ultrafine coal fly ashes satisfies the second kinetic model.The adsorption process is a intra-particle diffusion.The removal rates of Cr6＋ decrease with the increase of initial concentration.When pH6,the removal rate of Cr6＋ increases with the increase of pH value while when pH6,the removal rate decrease with the increase of pH value.

关 键 词：超细粉煤灰 改性 吸附 Cr6+ 

分 类 号：X075[环境科学与工程]