摘要
以石英砂作为载体,通过溶胶-凝胶法制备纳米羟基磷灰石复合型材料。通过投加量、初始pH、反应时间、粒径及初始浓度对复合型材料吸附镍离子性能的影响实验,结合扫描电镜对复合型材料做的表征分析,探讨复合型材料对镍离子的吸附特征与机理。实验结果表明,当投加量为5.2 g、溶液pH为7、反应时间为180 min、粒径为0.15～0.3 mm时,复合型材料对镍离子的去除效果较好且最大去除率为92.98%,最大吸附量达0.044 7 mg/g。复合型材料对镍离子的吸附符合准二级吸附动力学模型和Frenudlich等温吸附模型。SEM、EDS分析表明,复合型材料对镍离子的吸附作用主要为离子交换。
Nanosized hydroxyapatite(HAP)composites were prepared by the solutiongel mixed with quartz.By studying a series of batch adsorption experiments about dosing amount,initial pH,reaction time,particle size and initial concentration,the adsorption capacity for Ni^2+on HAP composites was measured.The characteristics of adsorbent before and after adsorption were observed by scanning electron microscope.According to the experimental results,it showed that the maximum Ni^2+removal rate and the maximum adsorption capacity of nickel ion was respectively 92.98%and 0.044 7 mg/g when composite content was 5.2 g,the pH was 7,the reaction time was 180 min and the particle size was at 0.15~0.3 mm.Furthermore,the adso-rption kinetics was best fitted by the pseudo-second order model,while the adsorption equilibrium was best described by Frenudlich isotherms.The analysis of SEM and EDS indicated that the adsorption mechanism may be controlled by ionexchange adsorption.
作者
钱程
张卫民
Qian Cheng;Zhang Weimin(State Key Laboratory Breeding Base of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)
出处
《无机盐工业》
CAS
CSCD
北大核心
2019年第2期45-49,共5页
Inorganic Chemicals Industry
基金
国家自然科学基金资助项目(41562011)
江西省教育厅科技落地计划项目(KJLD13054)
