摘要
水体中重金属的污染对人类生产生活造成了重要影响。以Birnessite型二氧化锰纳米材料作为新型吸附剂,研究其对水中Pb^(2+)的吸附性能。首先,利用液相合成方法制备尺寸在200~900 nm之间的Birnessite型二氧化锰纳米花,通过超声的方式将其分散在含有Pb^(2+)的水体中,考查吸附过程中水体pH值、离子强度、材料尺寸、吸附时间和Pb^(2+)初始浓度对Birnessite型二氧化锰纳米花吸附Pb^(2+)的影响;同时,结合动力学模型和等温吸附曲线模型的拟合数据,分析材料吸附Pb^(2+)过程的机理。实验结果表明,制备的Birnessite型二氧化锰纳米花在pH值5~9之间的水中对Pb^(2+)均具有稳定的良好的吸附性能,最大吸附量可达300 mg·g^(-1);Birnessite型二氧化锰纳米花的尺寸越小其比表面积越大,吸附性能越好;同时在高离子强度下其仍保有80%左右的吸附能力。吸附动力学和等温吸附曲线拟合数据表明Birnessite型二氧化锰纳米花吸附水中Pb^(2+)的过程主要是单分子层均匀覆盖的化学吸附过程。
The pollution of heavy metals in water has caused an important impact on human production and life.In this paper,Birnessite type manganese dioxide nanomaterials were used as new adsorbents to study the adsorption properties of Pb^(2+)in water.Firstly,the Birnessite MnO_(2)nanoflowers with the size from 200 nm to 900 nm were prepared by liquid phase synthesis method,and the adsorptive property of the obtained samples was studied by Pb^(2+)adsorption experiments.The effects of pH value,ionic strength,material size,adsorption time and initial concentration of Pb^(2+)were investigated.The adsorption mechanism of Pb^(2+)was studied with the fitting data of kinetic model and isothermal adsorption curve model.The experimental results showed that the prepared Birnessite MnO_(2)nanoflowers had excellent adsorption properties for Pb^(2+)in water with the pH value 5-9,and the maximum adsorption capacity was up to 300 mg·g^(-1).The Birnessite MnO_(2)nanoflowers with the smaller size had the larger specific surface area,which caused the better adsorption performance.The Birnessite MnO_(2)nanoflowers still had about 80%adsorption capacity when the Pb^(2+)adsorption experiment carried out in high ionic strength solution.The fitting data of adsorption kinetics and isothermal adsorption curve show that the adsorption process of Pb^(2+)by Birnessite MnO_(2)nanoflowers is mainly the process of uniform coverage by single molecular layer with chemisorption process.
作者
郝新丽
郑钰涛
周亚红
周靖凯
代雨函
马佳莹
李启航
HAO Xinli;ZHENG Yutao;ZHOU Yahong;ZHOU Jingkai;DAI Yuhan;MA Jiaying;LI Qihang(Hebei Province Collaborative Innovation Center for Sustainable Utilizationof Water Resources and Optimization of Industrial Structure,Hebei Province KeyLaboratory of Sustained Utilization&Development of Water Resources,HebeiCenter for Ecological and Environmental Geology Research,School ofWater Resources&Environment,Hebei GEO University,Shijiazhuang 050031,China;School of Law and Politics institute,Hebei GEO University,Shijiazhuang 050031,China)
出处
《功能材料》
CAS
CSCD
北大核心
2024年第5期5086-5092,共7页
Journal of Functional Materials
基金
河北省教育厅科学研究项目(ZD2022119),中央引导地方科技发展资金项目(236Z4204G)
河北省自然科学基金资助项目(D2022403016)
河北地质大学博士启动基金(BQ2017008)。
关键词
二氧化锰
纳米花
重金属吸附
吸附动力学
等温吸附曲线
manganese dioxide
nanoflower
heavy metal adsorption
adsorption kinetics
isothermal adsorption curve
