摘要
分别采用NaOH、NH3.H2O、H2O2以及不同浓度的HNO3溶液对微孔颗粒活性炭浸渍改性,通过静态试验研究了改型活性炭对水溶液中亚甲基蓝吸附特性的研究,并从动力学角度探讨吸附机理。实验结果表明,硝酸改性后表面的羧基含量增加,酚羟基含量减少;氢氧化钠和氨水改性后,碱性基团含量显著增加;硝酸改性后活性炭的吸附量略有增加,碱液改性和硫酸镁改性后活性炭吸附量略有减少。改性后活性炭材料对亚甲基蓝吸附均更符合伪二级吸附模型,R2>0.99。
Microporous granular activated carbon （GAC） was impregnated to modify by NaOH,NH3·H2O, H2O2and different concentrations of HNO~ solution, respectively. The adsorption equilibrium and kinetic behavior of , methylene blue onto the modified microporous activated carbon were investigated by conducting a series of batch adsorption experi- ments, and the adsorption mechanism was discussed from kinetic point of view. The results showed that the carboxyl quan- tity of the surface of microporous activated carbon was increased by nitric acid modifing, while phenolic hydroxyl content decreased. Owing to sodium hydroxide and ammonia modifing, the basic groups had a significant increase. It was also found that intra-particle diffusion was the rate-limiting step in the adsorption. The adsorption kinetics of methylene blue onto modified microporous activated carbon were more in line with pseudo-second-order model, R^2〉0. 99.
出处
《化工新型材料》
CAS
CSCD
北大核心
2013年第1期76-79,共4页
New Chemical Materials
基金
浙江省有机化学与皮革化工重中之重学科开放基金(100061200126)
国家自然基金培育计划(JB-ZR1150)
关键词
表面改性
微孔活性炭
亚甲基蓝
吸附机理
surface modification,microporous carbon,methylene blue,adsorption mechanism
