| 磷酸改性玉米芯吸附剂对水中亚甲基蓝的吸附研究 |
| |
| 作者单位： | ;1.河南师范大学环境学院;2.河南省环境污染控制重点实验室;3.黄淮水环境与污染防治省部共建教育部重点实验室 |
| |
| 摘 要： | 对磷酸改性玉米芯制备的吸附剂吸附水中亚甲基蓝进行了研究,考察了其吸附特性及影响吸附的因素,探讨了吸附过程的热力学和动力学.结果表明:磷酸改性后玉米芯吸附剂对水中亚甲基蓝的吸附能力明显增强.亚甲基蓝浓度100mg/L,改性吸附剂投加量0.05g,温度25℃,pH 6.0,吸附时间60min时,对亚甲基蓝的吸附量为99.06mg/g.吸附等温线可很好地用Langmuir方程式拟合,吸附热力学参数ΔG0小于0,而ΔH0、ΔS0大于0,吸附使体系的有序性降低;吸附过程符合伪二级动力学,吸附很可能是分子计量置换机制.
|
| 关 键 词： | 改性玉米芯 吸附 亚甲基蓝 |
Phosphoric Acid Modified Corn Cob Adsorbent for Adsorption of Methylene Blue in Water |
| |
| Affiliation: | ,School of Environment,Henan Key Laboratory for Environmental Pollution Control,Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control,Ministry of Education,Henan Normal University |
| |
| Abstract: | The use of adsorbent prepared from phosphoric acid modified corn cob has been studied for the removal of methylene blue(MB)from water.Factors that affect the adsorption process and the thermodynamics and dynamics of the adsorption were investigated in details.The results showed that the adsorbent prepared had good adsorption performances for MB in water.The equilibrium adsorption quantity of MB reached 99.06mg/g in 60 min with 6.0pH,0.05 g as dosage,100mg/L MB concentration and 25 ℃temperature.The equilibrium data the best fitted with Langmuir model.The values of thermodynamic parameters in change showed that Gibbs energy.ΔG0<0,but enthalpy.ΔH0>0,entropy.ΔS0>0,indicating the process to be spontaneous and orderliness decreased.The adsorption followed pseudo-second order kinetics and may be molecular stoichiometric displacement mechanism. |
| |
| Keywords: | modified corn cob absorption methylene blue |
| 本文献已被 CNKI 等数据库收录！ |
|
