摘要
将苯酚和甲醛为前驱体合成的典型碳气凝胶(Carbon Aerogel,CA)作为吸附剂,探讨其去除水中锰Mn(Ⅱ)的性能和机理。采用比表面积与孔径分析仪对CA进行比表面积和孔径结构分布表征,采用扫描电子显微镜(Scanning Electron Microscope,SEM)、傅里叶变换红外光谱(Fourier Transform Infrared Spectrum,FT-IR)表征吸附锰前后CA的理化性质和特征基团,探究在不同pH值、反应时间、初始浓度、吸附剂用量和反应温度的条件下,碳气凝胶作吸附剂对除Mn(Ⅱ)效果的影响,并进行吸附剂再生性能测试,对吸附过程采用吸附动力学和等温线模型进行分析。结果显示,在优化条件下,除锰率达80%以上,最大吸附质量比为2.72 mg/g,且具有可靠的吸附再生能力,吸附过程中形成了O—Mn振动峰,吸附机理主要为单层和多层吸附结构共存的化学吸附。碳气凝胶作吸附剂具有除锰的可行性和潜力,可作为一种新型吸附材料应用于含锰地下水处理中。
The typical Carbon Aerogel(CA),synthesized from phenol and formaldehyde,was utilized as an adsorbent to investigate its performance and mechanism for removing manganese ions [Mn(Ⅱ)] from water.The specific surface area and pore size distribution of the CA were characterized using a specific surface area and pore size analyzer.The physical and chemical properties,as well as the characteristic functional groups of CA,were characterized before and after the adsorption of manganese using Scanning Electron Microscopy with Energy Dispersive Spectroscopy(SEM-EDS)and Fourier Transform Infrared Spectroscopy(FT-IR).The study investigated the removal of Mn(Ⅱ)using carbon aerogel as an adsorbent under varying conditions,including different pH levels,reaction times,initial concentrations,adsorbent dosages,and reaction temperatures.Additionally,the regeneration performance of the adsorbent was evaluated.The adsorption process was analyzed using kinetic and isotherm models.According to the Brunauer-Emmett-Teller(BET)and Barret-Joyner-Halenda(BJH)measurement methods,CA exhibited a specific surface area of 1983 m^(2)/g,with a predominance of micropores.Scanning Electron Microscopy with Energy-Dispersive Spectroscopy(SEM-EDS)images revealed that CA has a rough surface texture and a uniform distribution of manganese ions following adsorption.During the adsorption process,results indicated that under optimized conditions,the manganese removal rate exceeded 80%,with a maximum adsorption capacity of 2.72 mg/g.The adsorption of Mn(Ⅱ) was primarily affected by pH,adsorbent dosage,and temperature.After three cycles of adsorption-desorption,the Mn(Ⅱ) removal efficiency remained stable at approximately 70%,indicating that the adsorbent had a reliable regeneration capability.The adsorption process was well-fitted to both the Langmuir adsorption model(R^(2)>0.95)and the Freundlich adsorption isotherm(R^(2)>0.95),suggesting the presence of both unimolecular and multi-molecular layer adsorption mechanisms.The pseudo-second order kinetic model(R^(2)>0.99)effectively describes the adsorption characteristics,indicating that the process is primarily governed by chemical adsorption.Additionally,the FT-IR spectrogram reveals the formation of C—O—Mn/O—Mn vibration peaks,suggesting that the adsorption of manganese ions onto CA is predominantly driven by chemical mechanisms.In summary,carbon aerogel demonstrates both feasibility and potential for the removal of manganese,making it a promising new adsorbent material for treating manganese contamination in groundwater.
作者
华绍广
王文静
李波
阚培赢
张玲敏
HUA Shaoguang;WANG Wenjing;LI Bo;KAN Peiying;ZHANG Lingmin(Sinosteel Maanshan General Institute of Mining Research Co.,Ltd.,Maanshan 243000,Anhui,China;Central Plains Environmental Protection Co.,Ltd.,Zhengzhou 450000,China)
出处
《安全与环境学报》
北大核心
2025年第8期2955-2963,共9页
Journal of Safety and Environment
关键词
环境工程学
碳气凝胶
除锰
吸附
机理
水处理
environmental engineering
carbon aerogel
Mn(Ⅱ)removal
adsorption
mechanism
water treatment
