摘要
采用批量实验法研究了大孔阳离子交换树脂Amberlyst 15负载银离子前后对萘和1,3-二氯苯的吸附行为.结果表明,在实验所研究的浓度范围内Amberlyst 15负载银离子后对萘的表观吸附平衡分配系数K d值有显著增加,而对1,3-二氯苯的K d值影响甚微.除范德华力外,载银Amberlyst 15的银离子空轨道能与π供体有机物——萘之间产生了阳离子-π键络合作用,其化学络合能量强于范德华力,进而促进了对萘的吸附;而1,3-二氯苯为非π供体有机物,载银处理未能对其吸附产生显著影响.载银Amberlyst 15作为一种π络合吸附剂,可为探索开发水环境中π供体有机污染物的去除技术提供重要技术参考.
Adsorption behaviors of naphthalene and 1,3-dichlorobenzene to macro-porous cation exchange resin Amberlyst 15 before and after exchange with silver ions were evaluated using batch experiments. The results showed that, within the concentration range of this experiment, the apparent sorption distribution coefficient Ka of naphthalene was significantly enhanced after Amberlyst 15 exchange with silver ions, while the influence on 1,3-dichlorobenzene was negligible. The silver ions loaded on Amberlyst 15 supplied empty orbitals to interact with naphthalene （as a π-donor） via cation-π complexation, and the chemical complexation bonds are generally stronger than van der Waals interaction, which lead to the adsorption enhancement of naphthalene; The adsorption of 1,3-dichlorobenzene （ as a non-π-donor） did not change after Amberlyst 15 exchange with silver ions. As a π complexation adsorbent, the silver ion-exchanged Amberlyst 15 can be used for the removal of π-donor organic pollutants in wastewater treatment.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第11期2115-2120,共6页
Environmental Chemistry
基金
高等学校博士学科点专项科研基金资助课题(20100031120031)资助
关键词
吸附
π络合
载银Amberlyst
15
萘
adsorption,πcomplexation, silver ions-exchanged Amberlyst 15, naphthalene.
