玉米秸秆碱尿处理及其重金属吸附性能研究
Study on Alkaline Urine Treatment of Corn Stalk and Its Heavy Metals Adsorption Properties
司璟璐 1马韶华 1舒蔚翔 1尹旌翔 1成庆利1
作者信息
- 1. 华北水利水电大学 环境与市政工程学院,河南 郑州 450046
- 折叠
摘要
通过正交设计降低秸秆中木质素含量,最佳实验方案为:水洗温度 70℃,NaOH 和尿素的添加量分别为5%和 8%.处理后的秸秆纤维用于吸附 Pb2+、Cd2+、Zn2+等重金属离子,效果显著.吸附符合准二级动力学模型和Freundlich方程,表明吸附过程为吸热且易于进行的化学吸附,颗粒内扩散和表面吸附共同控制吸附速率.改性后的玉米秸秆纤维去除水中重金属,吸附率高,达到变废为宝的目的.
Abstract
Corn stalk is a kind of renewable resource,and its fiber modificated with alkaline urine was a favored material used for heavy metals adsorptions.Orthogonal test was adopted to reduce the lignin content of stalk,and the optimal parameters were as follows:70℃of washing temperature,and 5%and 8%of the addition amount of NaOH and urea,respectively.The treated stalk fiber could adsorb significantly Pb2+,Cd2+,Zn2+ ions.The pseudo-second-order model and the Freundlich equation were better with the adsorption process.These results indi-cated that the adsorption process was endothermic and easy to carry out chemisorption reaction,and the adsorption rate was controlled by intraparticle diffusion and surface adsorption.The modified corn stalk fiber could remove heavy metals from water with high adsorption rate and turn waste into treasure.
关键词
玉米秸秆/碱尿处理/重金属/吸附性能Key words
corn stalk/alkaline urine treatment/heavy metal/adsorption property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据