核桃壳吸附废水氨氮的动力学和影响因素  

Influencing factors and dynamics of ammonia adsorption by walnuts shell

作　　者：丁绍兰[1] 齐泽宁 谢林花[1] 

机构地区：[1]陕西科技大学资源与环境学院,西安710021

出　　处：《环境工程学报》2016年第2期581-585,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金主任基金项目(21347004)

摘　　要：对核桃壳吸附废水中氨氮的动力学和影响因素进行了研究。考察了p H、时间、Na+、Cr3+和温度等因素对模拟废水中氨氮的吸附行为的影响。研究结果显示,核桃壳对氨氮的吸附最佳p H为8.5,通过对吸附过程动力学参数的计算,吸附过程符合二级动力学过程,Langmuir模型能较好地反映吸附过程特征。285、300和310 K条件下最大吸附量分别为0.45、0.58和0.6 g/kg。说明核桃壳是具有潜在利用价值的生物质吸附材料。Walnuts shells were used to adsorb ammonia nitrogen in synthetic wastewater. The influencing factors and dynamics of ammonia nitrogen adsorption were studied. The effects of contact time,p H,Na^＋,Cr^3 ＋and temperature on adsorption characteristics of ammonia nitrogen were also investigated. The results showed that the optimal p H was 8. 5. Through calculating the adsorption kinetics parameters,the adsorption process of ammonia nitrogen was in line with Lagergren model and in accord with second rate dynamics equation. When temperatures were 285 K,300 K,310 K,the maximum adsorption capacity could reach 0. 58,0. 6 and 0. 45 g / kg,respectively. These results showed that walnuts shell is a prospective bio-adsorbent.

关 键 词：核桃壳 氨氮 吸附 动力学 

分 类 号：X712[环境科学与工程—环境工程]