摘要
为了研究改性葵花秸秆对铅离子的吸附性能,采用氢氧化钠处理、高锰酸钾和浓硫酸氧化的方法对葵花秸秆粉末改性,由单因素实验来考察p H、吸附剂用量、温度、时间对铅离子去除率的影响;再设计正交实验,确定最优吸附条件;最后进行吸附动力学模型分析。结果表明:pH=6、吸附剂用量1.0 g、温度25℃、时间60 min时吸附效果最好,此时改性前后葵花秸秆对铅离子的去除率分别为81%和90.5%;影响铅离子去除率的因素从大到小依次为投加量、溶液pH、反应温度、吸附时间;改性葵花秸秆对铅离子的吸附动力学符合准二级动力学模型。
In order to study the adsorption of Pb^(2+) on modified sunflower straw, sodium hydroxide alkali treatment,potassium permanganate and concentrated sulfuric acid oxidation were used to modify the sunflower straw, the influence of pH, the amount of adsorbent, temperature and time on the removal rate of Pb^(2+) was investigated by the single factor experiment. The orthogonal experiment was designed to determine the optimal adsorption conditions. Finally,the adsorption kinetics model was analyzed. The results showed that the adsorbent effect was best when pH was 6, the amount of adsorbent was 1.0 g, the temperature was 25 ℃, and the time was 60 min;the removal rate of Pb^(2+) was 81% and 90.5% before and after the modification, respectively.The factors affecting the removal rate of Pb^(2+) from large to small were as follows: dosage > solution pH > reaction temperature > adsorption time. The adsorption kinetics of modified sunflower straw conformed to the quasi-secondary kinetics model.
作者
李小菊
李治军
李惠成
武芸
张鹏会
胡浩斌
崔如梅
LI Xiao-ju;LI Zhi-jun;LI Hui-cheng;WU Yun;ZHANG Peng-hui;HU Hao-bin;CUI Ru-me(School of Chemistry and Chemical Engineering,Longdong University,Qingyang 745000,China)
出处
《当代化工》
CAS
2021年第6期1308-1313,共6页
Contemporary Chemical Industry
基金
国家自然科学基金资助青年科学基金项目,柔性共价有机框架的构建及其动态响应行为研究(项目编号:201702089)
甘肃省应用化学省级重点学科建设项目(项目编号:GSACKS20130113)
Supported by the Key Constructive Disciplines of Longdong University(项目编号:LDXYKCD201704)
陇东学院博士科研启动资金资助项目,天然高分子材料的研究与应用(项目编号:XYBY1409)
陇东学院青年基金项目,改性葵花秸秆对含油废水的处理研究(项目编号:XYZK1904)。
关键词
葵花秸秆
铅离子
吸附
正交分析
动力学
结构表征
Sunflower straw
Structure characterization
Pb^(2+)
Adsorption
Orthogonal analysis
Dynamics
