粉煤灰吸附处理Cd~(2+)废水的动力学和热力学研究
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摘要
以固体废弃物粉煤灰为吸附剂材料,利用硝酸镉试剂模拟含Cd~(2+)废水,重点探讨了粉煤灰对Cd~(2+)的吸附动力学和热力学行为。结果表明,粉煤灰对Cd~(2+)的吸附动力学过程符合准二级动力学模型,主要以化学吸附为主;等温吸附过程符合Freundlich等温吸附模型;热力学结果表明该吸附过程为一自发进行的熵增吸热过程。
In this paper,solid waste fly ash were used as adsorbent materials. The cadmium nitrate reagent was used to simulate the wastewater containing Cd~(2+). The adsorption kinetics and thermodynamics behavior of Cd~(2+) onto fly ash were mainly discussed. The pseudo-second-order model provided the best fitting for the adsorption kinetics of Cd~(2+) onto fly ash,indicating the adsorption was mainly chemical. The adsorption isotherm was fitted well with the Freundlich model. Thermodynamics analysis indicated that Cd~(2+) adsorption onto fly ash was spontaneous,entropy increase and endothermic process.
In this paper,solid waste fly ash were used as adsorbent materials. The cadmium nitrate reagent was used to simulate the wastewater containing Cd~(2+). The adsorption kinetics and thermodynamics behavior of Cd~(2+) onto fly ash were mainly discussed. The pseudo-second-order model provided the best fitting for the adsorption kinetics of Cd~(2+) onto fly ash,indicating the adsorption was mainly chemical. The adsorption isotherm was fitted well with the Freundlich model. Thermodynamics analysis indicated that Cd~(2+) adsorption onto fly ash was spontaneous,entropy increase and endothermic process.
引文
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[4]郑曼迪，熊黑钢，伊元荣．不同环境条件下粉煤灰吸附铅离子效率对比研究[J]．河南师范大学学报(自然科学版)，2018,46(2):66-72.
[5]宋祎楚，冀晓东，柯瑶瑶，等．粉煤灰合成沸石对Cr2+的去除能力及影响因素研究[J]．环境科学学报，2015,35(12):3847-3854.
[6]吕志江，刘云国，樊霆，等．改性粉煤灰吸附废水中的Cd2+、Pb2+、Cu2+试验研究[J]．非金属矿，2008,31(3):57-59.
[7] TAN P,SUN J,HU Y,et al. Adsorption of Cu2+,Cd2+and Ni2+from aqueous single metal solutions on graphene oxide membranes[J]. Journal of Hazardous Materials,2015,297:251-260.
[8] FAN S,LI H,WANG Z,et al. Cadmium removal from aqueous solution by biochar obtained by co-pyrolysis of sewage sludge with tea waste[J]. Research on Chemical Intermediates,2018,44(1):135-154.
[9]伍昌年，凌琪，唐玉朝，等．微波辅助酸改性粉煤灰对镉的吸附性能研究[J]．应用化工，2016,45(8):1428-1430.
[10]郑越，刘方，吴永贵．粉煤灰对工业废水中氨氮的吸附性能研究[J]．环境科学与技术，2011,34(1):4-7.
[2] SANTOS S,UNGUREANU G,BOVAENTRA R,et al.Selenium contaminated waters:An overview of analytical methods,treatment options and recent advances in sorption methods[J]. Science of The Total Environment,2015,521-522:246-260.
[3]文永林，刘攀，汤琪．农林废弃物吸附脱除废水中重金属研究进展[J]．化工进展，2016,35(4):1208-1215.
[4]郑曼迪，熊黑钢，伊元荣．不同环境条件下粉煤灰吸附铅离子效率对比研究[J]．河南师范大学学报(自然科学版)，2018,46(2):66-72.
[5]宋祎楚，冀晓东，柯瑶瑶，等．粉煤灰合成沸石对Cr2+的去除能力及影响因素研究[J]．环境科学学报，2015,35(12):3847-3854.
[6]吕志江，刘云国，樊霆，等．改性粉煤灰吸附废水中的Cd2+、Pb2+、Cu2+试验研究[J]．非金属矿，2008,31(3):57-59.
[7] TAN P,SUN J,HU Y,et al. Adsorption of Cu2+,Cd2+and Ni2+from aqueous single metal solutions on graphene oxide membranes[J]. Journal of Hazardous Materials,2015,297:251-260.
[8] FAN S,LI H,WANG Z,et al. Cadmium removal from aqueous solution by biochar obtained by co-pyrolysis of sewage sludge with tea waste[J]. Research on Chemical Intermediates,2018,44(1):135-154.
[9]伍昌年，凌琪，唐玉朝，等．微波辅助酸改性粉煤灰对镉的吸附性能研究[J]．应用化工，2016,45(8):1428-1430.
[10]郑越，刘方，吴永贵．粉煤灰对工业废水中氨氮的吸附性能研究[J]．环境科学与技术，2011,34(1):4-7.
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