水蒸气法制备椰壳活性炭及其对肌酐吸附效果研究

Adsorption of Creatinine on Activated Carbon Prepared from Coconut Shell by Steam

采用水蒸气活化法制备得到椰壳活性炭，以850℃活化得到微孔率最高的活性炭为吸附剂，考察其对肌酐的体外吸附性能，探讨了吸附时间、肌酐初始质量浓度、吸附温度及pH值对肌酐吸附量的影响。结果表明，微孔率高的（71．0％）椰壳活性炭对肌酐吸附性能良好；30min内吸附量迅速升至57．8mg/g，7h时达到平衡，平衡吸附量为76．4mg/g；在30～70℃温度范围内，肌酐吸附量随温度升高而增加；酸性环境有利于肌酐的吸附，pH值为2时吸附量达到最大，为123．55mg/g。

Activated carbons were prepared from coconut shell by steam activation at different activation temperatures. The effects of adsorption time, initial concentration of solution, pH value and reaction temperature on the adsorption behavior of creatinine on coconut-shell activated carbon which was activated at 850 ℃ was studied. The results showed that activated carbon with high microporosity is an excellent adsorbent for creatinine. The adsorption equilibrium was reached in 7 h and its equilibrium adsorption capacity was 76.4 mg/g. The adsorption ability increased with the increase of temperature while temperature ranged between 30 ℃ and 70 ℃. The adsorption capacity of CAC for creatinine on the acid conclition was better than that on the basic condition. When pH value is 2, the maximum adsorption capacity was found to be 123.55 mg/g.