摘要
采用化学修饰方法合成了水杨酸修饰聚苯乙烯,考察了该聚合物对重金属离子Pb2+和Cu2+的吸附性能。结果表明,在实验浓度范围内,水杨酸修饰聚苯乙烯(NDA-O)与没有修饰自交联生成的聚合物(NDA-150)对Pb2+的最大吸附量分别为0.130 mmol/g和1.749×10-2mmol/g,对Cu2+的最大吸附量分别为0.110 mmol/g和9.02×10-3mmol/g。NDA-O对Pb2+和Cu2+的吸附符合Langmuir吸附等温方程,为优惠吸附过程。溶液平衡浓度低于0.271 mmol/L时,对Pb2+、Cu2+的吸附为离子交换;溶液平衡浓度大于0.378 mmol/L时,也伴随发生络合反应。动态实验结果表明,在实验研究的浓度范围内,NDA-O对Pb2+、Cu2+的吸附能力为NDA-150的3倍,吸附饱和后的聚合物用体积分数为5%的HCl溶液冲洗可以完全再生和重复使用。
The salicylic acid modified polystyrene was prepared to study adsorption properties toward Pb^2＋ and Cu^2＋from aqueous solution. In the range of concentration in our study, Qe values of the chemical modified resin NDA-O and non-modified resin NDA-150 were 0. 130 mmol/g and 1. 749 × 10^-2 mmol/g respectively toward Pb^2＋ , and 0. 110 mmol/g and 9. 02 × 10^ -3 mmol/g respectively toward Cu^2＋. The adsorption data of both metal ions fit Langmuir equation very well and the adsorption processes were favorable ones. When the metal ions＇ concentrations at equilibrium were lower than 0. 271 mmol/L, the prevailing adsorption mechanism was ion exchange. And when the metal ions＇ concentrations was higher than 0. 378 mmol/L, surface complexation could be considered as well. In our study, the dynamic adsorption capacities of NDA-O toward metal ions were three times as many as those of NDA-150. The resin with metal ions adsorbed could be completely regenerated by washing with 5% hydrochloric acid.
出处
《应用化学》
CAS
CSCD
北大核心
2009年第2期219-223,共5页
Chinese Journal of Applied Chemistry
基金
安徽省教育厅资助项目(KJ2007B167)
