以椰壳活性炭和煤质柱状活性炭为吸附剂,考察了pH、活性炭投加量、震荡反应时间和反应温度等净化条件对两种活性炭吸附效果的影响。结果表明:(1)随着pH的增加,活性炭对含重金属废水的净化能力都呈现先增加后降低的趋势,当pH=7时,去除率最高;(2)活性炭投加量为4g时,两种吸附材料对Zn2+和Cd2+的吸附能力均达到饱和;(3)振荡反应时间为120min时,活性炭的吸附达到饱和,且活性炭对重金属废水的净化能力为:Zn2+>Cd2+;(4)当反应温度达到40℃时,活性炭对Zn2+和Cd2+的去除率均达到最大;(5)椰壳活性炭吸附Zn2+、Cd2+的吸附等温线和动力学都较好地符合Langmuir吸附等温式和准二级反应动力学模型。
Coconut shell activated carbon and coal columnar activated carbon were used as adsorbents.The effects of pH value,activated carbon dosage,shaking reaction time and temperature on the adsorption performance of activated carbons were investigated.The experimental results showed that:(1)when pH value was 7,the removal rate was the highest.(2)When the dosage of activated carbon was 4g,the adsorption capacity of Zn2+ and Cd2+ were all approached saturation point.(3)When the reaction time was 120min,the adsorption of activated carbon was saturated,and the purification capacity of activated carbon for heavy metal wastewater was Zn2+> Cd2+.(4)When the reaction temperature reached 40℃,The removal rates of Zn2+ and Cd2+ reached the maximum.(5)The adsorption isotherms and kinetics of Zn2+ and Cd2+ adsorbed by coconut shell activated carbon were in good agreement with Langmuir adsorption isothermal and quasi-second-order reaction kinetics models.
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基金资助
西南林业大学博士启动基金(111411);西南林业大学教育科学研究项目(yb201522)
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