摘要
采用冰醋酸-Ca(OH)2制备了新型活化橘子皮生物吸附剂HCOP,借助扫描电镜从微观组织形态上对比了未改性橘子皮(OP)、冰醋酸-Ca(OH)2活化橘子皮(HCOP)2种不同的生物吸附剂;研究了HCOP用量、p H、吸附时间和温度对HCOP吸附Co2+、Ni2+的影响,并讨论了吸附动力学和热力学模式。结果表明,当HCOP用量为5 g/L、p H 6.0的条件下,HCOP对2种离子的吸附速率均较快,符合准二级动力学方程。HCOP对Co2+、Ni2+的最大吸附量分别为44.58、52.47 mg/g,均符合Langmuir模型。在钴、镍二元混合体系中,HCOP对Ni2+的吸附选择性大于Co2+,HCOP可通过用HCl洗涤再生后循环使用6次。
Orange peel（OP） was modified with acetic acid and Ca（OH）2to prepare a nocel orange peel adsorbent named as HCOP. The microstructure of OP and HCOP were compared by scanning electron microscopy（SEM）. HCOP were used to absorb Co2＋and Ni2＋from aqueous solution.Equilibrium isotherms and kinetics were obtained and the effects of dosage of HCOP,p H, contact time, temperature studied in batch experiments.The results showed that when HCOP dosage of 5 g / L,under the condition of p H 6.0, adsorption rate was faster on two kinds of ion by HCOP, which was conform to pseudo-second order kinetics equation. The maximum adsorption capacities for Co2 ＋and Ni2 ＋were 44.58 mg / g and 52.47 mg / g,respectively,which were in line with the Langmuir model. Adsorptive capacity of HCOP for Ni2＋was better than that for Co2＋. The loaded biosorbent is regenerated using HCl solution and could be used repeatedly for six times.
出处
《湖北农业科学》
2016年第18期4675-4678,共4页
Hubei Agricultural Sciences
基金
河南省哲学社会科学规划项目(2013CZH009)
河南省社科联调研课题(SKL-2015-3244)
关键词
改性橘子皮
钴
镍
吸附效果
activated orange slag
cobalt
nickel
adsorption efficience
