摘要
以小球藻为原料,高温氧化后获得原状生物炭(BC),同时采用两步炭化法和氢氧化钾腐蚀造孔技术制备改性生物炭(KBC),考察炭化温度、碱炭质量比对KBC的产率以及对林可霉素(LIN)吸附效果的影响。采用SEM、BET、FTIR、XPS等表征生物炭的微观结构和组成,并通过吸附实验探究材料对LIN的吸附性能与机理。结果表明,炭化温度为800℃、碱炭质量比为0.75时制备的KBC吸附效果最佳,投加量为0.3 g/L时对20 mg/L的LIN去除率高达94%(吸附温度为25℃)。KOH改性不仅将KBC比表面积和总孔体积提升至719.28 m^(2)/g和0.44 cm^(3)/g,还显著增加其表面C—O、C=O等含氧官能团数量。生物炭投加量和LIN初始浓度对生物炭吸附效果影响显著,吸附过程更符合拟二级动力学和Freundlich模型,吸附过程为自发进行的吸热反应。
In order to overcome the high cost of antibiotic wastewater treatment and the lack of work to turn blooms and algae into resources,this study used chlorella as raw material to obtain undisturbed biochar(BC)after high temperature oxidation,and prepared potassium hydroxide modified biochar(KBC)by two-step carbonization method and potassium hydroxide(KOH)corrosion pore forming technology,and investigated the effects of carbonization temperature and alkaline carbon mass ratio on the yield of KBC and the adsorption effect of lincomycin(LIN).The KBC yields obtained under different pyrolysis temperatures and alkaline carbon ratios and the removal of lincomycin(LIN)were investigated.SEM,BET,FTIR,XPS and other technologies were used to characterize the changes in the properties of chlorella biochar before and after modification,a large number of experiments were carried out on the materials to explore the adsorption principle of LIN.The results show that the removal rate of LIN from KBC prepared at 800℃and impregnation ratio of 0.75 reached 94%.After KOH modification,the specific surface area of KBC was not only greatly increased to 719.28 m^(2)/g and the pore structure also reached 0.44 cm^(3)/g,but also significantly increased the number of C—O and C O on the surface of modified chlorella biochar.The dosage of biochar and the initial concentration of LIN would affect its adsorption.The McKay and Freundlich models were more consistent with the BC and KBC adsorption forest processes,and after thermodynamic analysis,it was concluded that the process of adsorption of LIN by the material occurred automatically and absorbed heat.
作者
杨延梅
付圻
敖亮
范围
YANG Yanmei;FU Qi;AO Liang;FAN Wei(Department of Environmental Science and Engineering,School of River&Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Southwest Branch of Chinese Research Academy of Environmental Sciences,Chongqing 401147,China;Chongqing Academy of Environmental and Ecological Science,Chongqing 401147,China)
出处
《应用化工》
北大核心
2025年第11期2856-2862,共7页
Applied Chemical Industry
基金
重庆市生态环境局2023年技术服务项目(2023047)。
关键词
小球藻
生物炭
改性
林可霉素
吸附机理
chlorella
biochar
modification
lincomycin
adsorption mechanism
