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环境化学  2015 

改性海泡石对Pb吸附特性的影响

Keywords: 海泡石,改性,Pb,吸附,影响因素

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Abstract:

研究天然海泡石和2种不同方法改性的海泡石对Pb吸附的影响.结果表明，不同Pb初始浓度、海泡石使用量、pH值和温度均对天然海泡石和改性海泡石吸附Pb有不同的影响.天然海泡石和改性海泡石对Pb的吸附量均随着溶液pH的提高而增加.海泡石经过氧化氢改性后可极大地促进其对Pb的吸附.天然海泡石和改性海泡石对Pb的等温吸附可用Langmuir方程和Freundlich方程来拟合，Langmuir方程的拟合效果最好，相关系数在0.9153—0.9702之间.低浓度的Ca2+和Mg2+(2—5mmol·L-1)均抑制天然海泡石和改性海泡石对Pb的吸附，而高浓度的Ca2+和Mg2+(10mmol·L-1)却促进天然海泡石和改性海泡石对Pb的吸附.当Ca2+和Mg2+浓度都为10mmol·L-1时，天然海泡石吸附Pb量分别比对照提高126.6%和137.8%，过氧化氢改性海泡石吸附Pb量分别提高32.1%和19.8%，硝酸钠改性海泡石吸附Pb量分别提高58.8%和57.9%.

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