改性玉米芯活性炭对镉的吸附性能研究
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摘要
利用农业固体废物玉米芯作原料制备了活性炭,通过吸附热力学和吸附动力学过程,探讨了改性玉米芯活性炭对Cd~(2+)模拟废水的吸附性能研究,以及考察了溶液pH值、活性炭投加量和温度对活性炭吸附Cd~(2+)的影响。研究结果表明:磷酸改性600℃下裂解的活性炭吸附能力最好;改性玉米芯活性炭对Cd~(2+)的吸附等温线更符合Freundlich模型;改性玉米芯活性炭对Cd~(2+)的吸附动力学过程用准二级动力学模型能更好地拟合;经过单因素影响试验的研究表明,溶液初始pH值为6、活性炭投加量为0.01g、吸附温度为40℃时,活性炭的吸附效果最好。
Activated carbon was prepared from agricultural solid waste corncob as raw material.The adsorption performance of modified corncob activated carbon on Cd~(2+)simulated wastewater was investigated by adsorption thermodynamics and adsorption kinetics.The pH value of the solution,the dosage of activated carbon and the effect of temperature on the adsorption of Cd~(2+)on activated carbonwere investigated.The results show that the adsorption capacity of activated carbon for pyrolysis at 600℃is the best;the adsorption isotherm of modified corncob activated carbon for Cd~(2+)is more in line with the Freundlich model;the adsorption kinetics of modified corncob activated carbon for Cd~(2+)is accurate.The kinetic model can be better fitted.The influence of single factor test shows that the initial pH of the solution is 6;the dosage of activated carbon is 0.01 g and the adsorption temperature is 40 ℃.
Activated carbon was prepared from agricultural solid waste corncob as raw material.The adsorption performance of modified corncob activated carbon on Cd~(2+)simulated wastewater was investigated by adsorption thermodynamics and adsorption kinetics.The pH value of the solution,the dosage of activated carbon and the effect of temperature on the adsorption of Cd~(2+)on activated carbonwere investigated.The results show that the adsorption capacity of activated carbon for pyrolysis at 600℃is the best;the adsorption isotherm of modified corncob activated carbon for Cd~(2+)is more in line with the Freundlich model;the adsorption kinetics of modified corncob activated carbon for Cd~(2+)is accurate.The kinetic model can be better fitted.The influence of single factor test shows that the initial pH of the solution is 6;the dosage of activated carbon is 0.01 g and the adsorption temperature is 40 ℃.
引文
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