摘要
【目的】研究食品加工剩余物板栗壳对水中Cu2+的吸附性能,为其用于含铜废水的处理提供理论依据。【方法】研究吸附质溶液pH、Cu2+质量浓度、吸附剂用量、粒径、吸附温度和时间对板栗壳吸附Cu2+效果的影响,探讨吸剂和吸附剂循环利用次数对解吸和再生的影响;并采用穿透曲线和洗脱曲线对动态吸附进行了分析。【结果】吸附质溶液pH值为6、Cu2+起始质量浓度为20 mg/L、吸附剂粒径为0.25 mm时的吸附效果较好,该吸附为放热过程,升高温度虽然可以加快吸附进程,但却降低了吸附量和去除率。Na+和Ca2+对Cu2+的解吸置换能力较弱,0.1mol/L HCl可使96.1%的Cu2+得以解吸回收。通过Thomas模型预测,在固定床柱吸附条件下饱和吸附量为10.94mg/g。【结论】板栗壳对水中Cu2+的吸附性能较好,因而具有很好的应用前景。
[Objective] In order to exploit chestnut shells,a residue of the food processing industry,in heavy metal waste treatment, the ability of chestnut shells to remove copper from aqueous solution by adsorption was studied. [Method] The effects of pH, mass concentration, dose and size of the adsorbent, contact time and temperature on the removal of Cu^2＋ , and desorption and regeneration were studied by batch process. Breakthrough capacity and desorption were studied by column process. [Result] Optimum adsorption condition occured at pH 6,initial mass concentration 20 mg/L,particle size 0.25 mm. The adsorption process was endothermic. Na^＋ and Ca^2＋ affected desorption slightly and 96. 1% of Cu^2＋ were recovered with 0.1 mol/L HCl. Thomas model showed the maximum solid-phase concentration was 10. 94 mg/g. [Conclusion] Chestnut shells have good adsorption capability for Cu^2＋, and therefore have prospect for Cu^2＋ removal from aqueous solution.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2009年第4期197-202,共6页
Journal of Northwest A&F University(Natural Science Edition)
基金
“东北之春”人才培养计划项目(06Y2C110106Y2C1102)
关键词
铜
板栗壳
污水处理
重金属污染
copper
chestnut shell
waste treatment
heavy metal pollution
