4A沸石去除水中Pb^(2+)的研究

Study on removal of Pb^(2+) in aqueous solution by zeolite 4A

在静态条件下,研究了4A沸石对废水中Pb2+的吸附性能,并探讨了影响吸附的因素。实验表明:当温度为30℃,废水pH为5~6,0.01 g4A沸石对100 mg/LPb2+溶液10 mL吸附20 min,Pb2+的去除率可达到99%以上。在实验研究条件下,4A沸石对Pb2+的吸附符合Langmuir和Freundlich等温吸附方程,相关系数为0.9819和0.9998。经计算,4A沸石对Pb2+的饱和吸附量为125 mg/g。4A沸石吸附水中Pb2+,达到吸附平衡的时间较短;溶液pH值的变化对吸附效果影响不显著;温度从室温略微升高,Pb2+的去除率略有增大。吸附在4 A沸石上的Pb2+可回收利用,处理后的4A沸石可以再生,且重复使用性能较好。

Under static state,the Pb2＋ in aqueous solution adsorption on zeolite 4A was studied. The results showed that the removal rate of Pb2 ＋ in aqueous solution was up to 99% after 20 min at 30 ℃ when a 5 - 6 pH 10 mL aqueous solution of Pb2＋ （ 100 mg/L） was adsorbed by 0.01 g zeolite 4A. The isothermal adsorption of zeolite 4A for Pb2＋ fit Langmuir equation and Freundlich equation under the condition of experimental concentration. The correlation coefficient was 0. 9819 and 0. 9998. The maximum adsorption capacity of zeolite 4A toward Pb2＋ was 125 mg/g by calculation. It took a short period of time to reach the adsorption equilibrium. The pH value had no prominent effect on the removal rate of Pb2 ＋. The removal rate of Pb2＋ was increased less as temperature increased in the specified scope. It was able to regenerate zeolite dA and recover Pb2＋.