锰改性核桃壳基生物炭去除水中刚果红的研究
Study on the Removal of Congo Red from Water by Manganese Modified Walnut Shell Based Biochar
王程豫 1赵卿瑞 1冯培龙 1张洪培 2王泽华 2华琼 1赵晓辉 2郑宾国2
作者信息
- 1. 郑州航空工业管理学院 土木建筑学院,河南 郑州 450046
- 2. 郑州航空工业管理学院 土木建筑学院,河南 郑州 450046;郑州市流域环境治理重点实验室,河南 郑州 450046
- 折叠
摘要
以农业废弃物核桃壳作为原材料,通过炭化与共沉淀法两步制备锰改性生物炭,用于去除水中典型的阴离子染料刚果红.研究刚果红不同初始浓度、接触时间、生物炭投加量、溶液pH对刚果红去除效果的影响.结果表明,在pH为3,刚果红初始浓度为10mg/L,生物炭投加量为10 mg,振荡时间60 min时,锰改性核桃壳对水中刚果红的去除率可达97.31％,与未改性的核桃壳相比,去除率提高至1.51倍.结合傅里叶红外光谱(FT-IR)与X射线衍射分析(XRD)对生物炭的结构变化以及吸附特征进行分析,通过动力学模型与热力学模型拟合,表明该吸附过程主要受化学吸附影响,该吸附为自发且不可逆的吸热反应.
Abstract
Manganese-modified biochar was prepared in two steps by charring and water bath heating using agricultural waste of walnut shells as raw material to remove Congo red,a typical anionic dye in water.The effects of different initial concentrations of Congo red,contact time,biochar dosage,and solution pH on Congo red removal were investigated.The results showed that at pH 3,initial concentration of 10 mg/L,biochar dosage of 10 mg,and contact time of 60 minutes,the removal rate of Congo red in water adsorbed by manganese-modified walnut shells was 97.31％,which was 1.51 times higher than that of unmodified walnut shells.The structural changes and adsorption characteristics of the biochar were analyzed by a combination of Fourier infrared spectroscopy(FT-IR)and X-ray diffraction(XRD)analysis.The kinetic and thermodynamic models were fitted to show that the adsorption process was mainly influenced by chemisorption and that adsorption was a spontaneous and irreversible heat absorption reaction.
关键词
核桃壳/生物炭/刚果红/动力学模型/热力学模型Key words
walnut shell/biochar/congo red/dynamic model/thermodynamic model引用本文复制引用
基金项目
河南省自然科学基金(222300420577)
河南省科技计划项目(232102320105)
河南省科技计划项目(212102310069)
河南省科技计划项目(212102310520)
河南省大学生创新训练计划项目(202210485045)
郑州航院研究生创新基金项目(2022CX83)
国家级大学生创新创业项目(202310485004)
出版年
2024
NETL
NSTL
维普
万方数据