D463树脂对废水中镍-氨络合离子的吸附性能与机理研究  

REMOVAL OF COMPLEX OF Ni(Ⅱ)-AMMONIA FROM THE WASTEWATER BY D463 AND THE MECHANISM INSIGHT

作　　者：韦蒙蒙[1] 刘福强[1] 赵伟[1] 凌晨[1] 张艳红[1] 朱长青[1] 李爱民[1] WEI Mengmeng LIU Fuqiang ZHAO Wei LING Chen ZHANG Yanhong ZHU Changqing LI Aimin(State Key Laboratory of Pollution Control and Resource School of the Environment, Nanjing University, Nanjing 210046, China)

机构地区：[1]污染控制与资源化国家重点实验室,南京大学环境学院,南京210046

出　　处：《离子交换与吸附》2016年第6期555-567,共13页Ion Exchange and Adsorption

基　　金：淮河流域(蚌埠段-洪泽湖上游)工业和城市污水毒害污染物综合控制研究与示范课题(2014ZX07204-008)

摘　　要：优选亚氨基二乙酸螯合树脂D463,系统考察了其对废水中镍-氨络合离子的吸附性能与机理。研究表明,镍离子吸附量随氨浓度升高而先升高后降低;采用Langmuir等温方程获得的镍离子最大吸附量为2.206mmol/g;氨与镍离子分别在120min和500min左右达到吸附平衡,准一级动力学方程和准二级动力学方程均可对镍离子的动力学曲线进行较好的模拟,氨和镍离子吸附量比随时间的进行先增大后减小。结合液相形态以及固相FT-IR和XPS分析,推测镍-氨双组份的吸附过程存在竞争与促进的交互作用:碱性体系中氨与镍离子形成阳离子络合物,促进镍离子的吸附,过量氨与镍离子竞争相同的树脂吸附位点,表现为相互抑制作用,但游离镍离子与树脂的螯合作用更具优势。该树脂对重金属的吸附回收具有广谱性。镍-氨和铜-氨体系动态吸附曲线表明镍离子和铜离子的穿透点分别为260BV和520BV,且1BV 12%硫酸和1BV的水可彻底再生D463,证明D463在含高氨废水中分离回收重金属离子方面具有广阔的应用前景。Selective removal of Ni（Ⅱ） from the basic wastewater with high ammonia concentration by iminodiacetic acid chelating resin （D463） and the mechanism was investigated. The sorption capacity of Ni（Ⅱ） increased at first and then decreased with the increasing concentration of ammonia. Langmuir equation described the isotherm data well and the maximum capacity of Ni（Ⅱ） was 2.206mmol/g. The adsorption of ammonia and Ni（Ⅱ） reached the equilibrium at 120min and 500min, respectively. The kinetic adsorption curve of Ni（Ⅱ） was fitted well by both Pseudo-first-order and Pseudo-second-order kinetics. The molar ratio of the capacity of ammonia and Ni（Ⅱ） loaded on D463 increased at first and then decreased. FT-IR, XPS analysis indicated that competition and promotion effect were both existed in the co-adsorption of Ni（Ⅱ） and ammonia. Ammonia promoted the Ni（Ⅱ） adsorption by the formation of complex which presents positive charge. However, the excessive ammonia sheltered the Ni（Ⅱ） and existed competition effect on the same adsorption sites on the resin. Analogous trends was obtained in Cu（Ⅱ） adsorption with high ammonia concentration by D463. Dynamic adsorption curves revealed that the breakthrough point of Ni（Ⅱ） and Cu（Ⅱ） were at 260BV and 520BV, respectively. The loaded Ni（Ⅱ） was thoroughly released by 1BV 12% H2SO4 and 1BV water. The resin exhibited great application potential in recycle of heavy metals from basic wastewater with high ammonia concentration.

关 键 词：螯合树脂 镍离子 氨 络合废水 吸附性能 

分 类 号：O647.3[理学—物理化学]