摘要
针对大气中由挥发性有机化合物不可控释放引起的环境和健康问题,开发新的吸附技术和材料是重要的解决途径之一。通过热处理廉价、无毒、可再生的蟹壳废弃物,并通过KOH活化制备了可对VOCs高效吸附的蟹壳生物质炭。以炭壳为原料制备了碳化蟹壳(CS)和蟹壳活性炭(CSK),并采用SEM、BET、FT-IR、XRD对其进行了表征,系统考察了温度对VOCs(二甲苯和正己烷)的影响,分析结果表明,制备的蟹壳生物质炭是一种具有介孔结构的多孔材料,其比表面积高达2098.15 m^(2)/g,平均孔径约为1.98 nm,孔体积为1.16 cm^(3)/g。最后,对制备的CSK-800进行了动态吸附实验,得到的二甲苯和正己烷的总吸附量分别为557.98、585.19 mg/g。吸附动力学研究结果表明,其吸附过程与准一级和Bangham模型拟合结果高度吻合,较好地诠释了蟹壳活性炭对VOCs吸附主要是以物理吸附为主的孔道扩散。
Address the environmental and health concerns arising from uncontrolled volatile organic compound(VOC)emissions into the atmosphere necessitates the development of novel adsorption technologies and materials.In this study,we have successfully produced high-efficiency biochar derived from crab shell(CS)through a process involving heat treatment of inexpensive,non-toxic,and renewable crab shell waste,followed by KOH activation.Carbonized CS and crab shell activated carbon(CSK)were meticulously prepared from the crab shell and subsequently characterized using by SEM,BET,FT-IR,XRD,and TEM techniques.A comprehensive investigation was conducted to evaluate the impact of temperature on the adsorption of VOCs(specifically xylene and n-hexane).The analysis results indicated that the produced crab shell biochar exhibted a mesoporous structure with exceptional properties,including a specific surface area of 2098.15 m^(2)/g,an average pore size of 1.98 nm,and a pore volume of 1.16 cm^(3)/g.Furthermore,dynamic adsorption experiments were conducted on CSK-800,demonstrating impressive total adsorption capacities of 557.98 mg/g and 585.19 mg/g for xylene and n-hexane,respectively.Additionaly,the adsorption kinetics analysis indicated that the adsorption process was highly consistent with both the quasi-first-order and Bangham model fitting results,emphasizing the role of physical adsorption and pore diffusion in VOCs adsorption by CS biochars.
作者
陈蓉
彭枢璇
张海龙
CHEN Rong;PENG Shu-xuan;ZHANG Hai-long(School of Naval Architecture and Maritime,Zhejiang Ocean University,Zhoushan 316022,China;School of Petrochemical Engineering and Environment,Zhejiang Ocean University,Zhoushan 316022,China;National-Local Joint Engineering Laboratory of Harbor Oil and Gas Storage and Transportation Technology,Zhejiang Ocean University,Zhoushan 316022,China)
出处
《化学试剂》
CAS
2024年第5期30-38,共9页
Chemical Reagents
基金
浙江省石油化学环境污染控制重点实验室开放研究课题项目(2021Z02)
SK绿色石化油品码头排放油气回收与处理关键技术研究与工程示范项目(21026003717)。
关键词
蟹壳生物质炭
热解
活化剂
挥发性有机物
吸附行为
crab shell biochar
pyrolysis
activator
volatile organic compounds
adsorption behavior
