摘要
研究以玉米秸秆为原料制备生物质活性炭,并分别进行NaOH和HNO_(3)改性。考察三种生物质活性炭的用量和粒径、水溶液pH值和吸附时间对水溶液中Cu^(2+)吸附性能的影响,并对其等温吸附特征、吸附动力学和吸附热力学进行研究。结果表明:当0.15~0.30 mm的生物质活性炭投加量为0.30 g,pH值为6.0时,对溶液中Cu^(2+)具有很好的去除率,在360 min时达到吸附平衡;吸附过程符合Langmuir和Freundlich模型以及准二级动力学方程,且热力学参数ΔG^(0)<0,ΔH^(0)和ΔS^(0)>0,为自发的、吸热的和熵增的过程,对水溶液中Cu^(2+)均具有较好的亲和力;相同条件下,三种生物质活性炭对Cu^(2+)的吸附效果表现为:NaOH改性>HNO_(3)改性>未改性。
In this study,biomass activated carbon was prepared from corn stalks and modified with NaOH and HNO_(3) respectively.The adsorption effects of the dosage,particle size,pH and adsorption time of the three biomass activated carbons on the adsorption performance to Cu^(2+) in the aqueous solution were studied,and the isotherm adsorption characteristics,adsorption kinetics and thermodynamics were also studied.The results show that when the dosage of 0.15~0.30 mm biomass activated carbon is 0.30 g and the pH is 6.0,the carbon has a good adsorption effect on Cu^(2+),and the adsorption reaches equilibrium at 360 min.The adsorption process conforms to the Langmuir and Freundlich model and pseudo-second-order kinetic equation,with the thermodynamic parametersΔG^(0)<0,ΔH^(0)andΔS^(0)>0,which is a spontaneous,endothermic,and entropy-increasing process,where both have good affinity for Cu^(2+) in aqueous solution.Under the same conditions,the adsorption effects of the three biomass activated carbons on Cu^(2+) shows that:NaOH modified biomass activated carbon>HNO_(3) modified biomass activated carbon>unmodified biomass activated carbon.
作者
包坤
王培若
刘艳娟
BAO Kun;WANG Pei-ruo;LIU Yan-juan(School of New Materials and Chemical Engineering,Tangshan University,Tangshan 063000,China;Tangshan Key Lab of Water Environment Ecological Restoration Technology,Tangshan University,Tangshan 063000,China)
出处
《唐山学院学报》
2022年第6期41-48,71,共9页
Journal of Tangshan University
