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Position: Home > Articles > Research on Cr~(6+) Adsorption Performances of Tealeaf Residue Modified by Formaldehyde for Journal of Tea Communication 2019,46 (1) 38-42

甲醛改性茶叶渣对废水中Cr~(6+)的吸附研究

作  者：
刘智峰;宋凤敏;李琛;刘瑾
单  位：
陕西理工大学化学与环境科学学院陕南秦巴山区生物资源综合开发协同创新中心
关键词：
茶叶渣;甲醛改性;含铬废水;吸附动力学
摘  要：
采用甲醛改性茶叶渣制成吸附剂,研究其对废水中Cr~(6+)的吸附性能。考察了Cr~(6+)初始浓度、溶液p H值、吸附剂用量、吸附时间和吸附温度等5个因素对吸附率的影响,并分析了改性茶叶渣吸附Cr~(6+)的吸附动力学特征。结果表明:Cr~(6+)初始浓度为60 mg/L、溶液pH为2、吸附剂用量为0.6 g、吸附时间为60 min、吸附温度为25℃时,改性茶叶渣对Cr~(6+)的吸附率可达94.0%。吸附过程符合准二级动力学模型,其相关系数达到0.9956,以化学吸附为主。
译  名：
Research on Cr~(6+) Adsorption Performances of Tealeaf Residue Modified by Formaldehyde for
作  者：
LIU Zhi-feng;SONG Feng-min;LI Chen;LIU Jin;College of Chemical and Environment Science,Shaanxi University of Technology,Biological Resources Comprehensive Development Collaborative Innovation Center in Qin-Ba Mountain Area;
关键词：
Tealeaf residue;;Formaldehyde modification;;Chromium wastewater;;Adsorption kinetics
摘  要：
A new type of adsorbent was prepared using tealeaf residue modified by formaldehyde to study its adsorption performance for Cr~(6+) in waste water. The main influence factors on the adsorption capacity for Cr~(6+) were investigated including pH value, reaction time, initial concentration, dosage of tea and adsorptive temperature. The optimum conditions were obtained with initial concentration of Cr~(6+) at 60 mg/L, the amount of adsorbent at 0.6 g, pH value of 2, adsorptive time at 60 mins and temperature at 25 ℃. Under these conditions, the removal rate of Cr~(6+) is 94.0%. Kinetics was evaluated utilizing the pseudo-first-order reaction and pseudo-second-order reaction models, the results showed that the adsorption kinetics followed the mechanism of the pseudo-second-order reaction equation, correlation coefficient reach 0.9956, mainly chemical adsorption.

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