锰改性沸石去除水中砷的研究

Study on Removal of Arsenic in Water by MnO2 Coated Zeolite

研究了锰改性沸石(MOCZ)对水中砷的吸附效果、影响因素及其吸附除砷的机理。结果表明,当原水中的砷浓度为100μg·L-1时,在MOCZ与砷的质量比为100∶1、温度为25℃、接触时间为240min、水样pH值为6～7的条件下,MOCZ对砷的去除率达到90%以上,吸附后水样中砷浓度为9.50μg·L-1,低于《生活饮用水卫生标准》的要求(≤10μg·L-1)。Langmuir吸附等温模型能较好地描述MOCZ对水中砷的吸附行为,拟合曲线的相关系数R2=0.9856,初步推测为单层吸附。

The adsorption efficiency, adsorption influential factors and mechanism of MnO2 coated zeolite （MOCZ） to arsenic in water are studied. The results show that,when arsenic concentration in water is 100μg ·L-1 ,arsenic removal rate is over 90% under stirring for 240 min at mass ratio of MOCZ to arsenic of 100 ：1, pH value of 6-7,temperature of 25 ℃. Arsenic concentration after adsorption is 9.50 μg · L-1,which is less than the demand of standard for drinking water quality（≤10 μg · L-1 ）. Langmuir adsorption isotherm model can describe the adsorption behavior of MOCZ to arsenic in water better. The correlation coeffieient（R2） of fit- ting curve for the experimental data is 0. 9856,based on which,it is speculated that the mode of MOCZ adsor- bing arsenic in water is monolayer adsorption.