摘要
本研究用NaOH预处理后的香菇废弃物作为吸附材料,处理含铜、锌的重金属废水。研究了吸附时间、pH值、初始金属离子质量浓度、香菇废弃物质量浓度等因素对预处理后香菇废弃物吸附铜、锌离子的影响。结果表明:预处理后香菇废弃物对铜和锌的吸附平衡时间均为10 min;对铜和锌吸附的最佳pH值范围分别为5~7和5~6,其中对锌的吸附率在pH=2~4的范围内也能保持在87%左右。当香菇废弃物质量浓度大于4 g/L,铜/锌的吸附率均不再增大;吸附动力学实验表明,伪二级动力学模型能够很好地拟合预处理后香菇废弃物对铜和锌的动力学吸附过程,相关系数R2均为0.999 9;热力学分析表明,香菇废弃物对铜和锌的吸附热力学过程用Langmuir和Freundlich等温吸附模型均能较好地描述。Langmuir模型拟合结果显示,预处理后香菇废弃物对铜和锌的理论最大吸附量分别为8.993 mg/g和20.16 mg/g。
In this study,the Lentinus edodes residue,which was pretreated by NaOH,was used to remove Cu^2+and Zn^2+in the wastewater.The effecting conditions,including contacting time,pH,adsorbent dose,initial concentrations of ion metal on the absorbed Cu 2+and Zn 2+were examined.Results showed that the adsorption of Cu^2+/Zn^2+can reach equilibrium within 10 min,while the suitable adsorption pH range was 5~7 and 5~6 for Cu^2+and Zn^2+respectively.The adsorption ratio of Zn^2+was still above 87%even when pH was within 2~4.Once the dose of adsorbent was above 4 g/L,the adsorption of Cu^2+/Zn^2+witnessed no increase any more.Pseudo-second-order model well fitted Cu^2+and Zn^2+adsorption kinetics of the treated L.edodes residue with correlation coefficient R^2 all of 0.999 9 respectively.Thermodynamic of Cu^2+/Zn^2+adsorption onto the treated L.edodes residue can be well fitted by both the Freundlich model and Langmuir model,and the theoretical adsorption capacity were 8.993 mg/g and 20.16 mg/g for Cu^2+and Zn^2+,respectively.
作者
马培
张庆甫
吴佳
韩新庆
MA Pei;ZHANG Qingfu;WU Jia;HAN Xinqing(Hennan University of Engineering,Zhengzhou 451191)
出处
《工业安全与环保》
2018年第7期92-95,共4页
Industrial Safety and Environmental Protection
基金
国家自然科学基金(41401549)
河南工程学院博士基金(062301)
关键词
铜
锌
吸附动力学
吸附热力学
copper
zinc
adsorption thermodynamics
adsorption dynamics
