碳酸钾活化改性花生壳生物炭对氨氮的吸附性能研究  

Adsorption Properties of Ammonia Nitrogen by Activated Peanut Shell Biochar Modified by Potassium Carbonate

作　　者：李子厚 胡可媛 林榆程 王楚怡 王卫 LI Zi-hou;HU Ke-yuan;LIN Yu-cheng;WANG Chu-yi;WANG Wei(Laboratory of Advanced Theranostic Materials and Technology,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315300,China;College of Science&Technology,Ningbo University,Ningbo 315300,China;Ningbo Cixi Institute of Biomedical Engineering,Ningbo 315300,China)

机构地区：[1]中国科学院宁波材料技术与工程研究所先进诊疗材料与技术实验室,浙江宁波315300 [2]宁波大学科学技术学院,浙江宁波315300 [3]宁波慈溪生物医学工程研究所,浙江宁波315300

出　　处：《精细化工中间体》2024年第5期46-51,共6页Fine Chemical Intermediates

基　　金：宁波市自然科学基金项目(2023J173);国家级大学生创新创业训练项目(202313277012)。

摘　　要：以花生壳为原料,碳酸钾为改性剂,在500℃氮气中煅烧制成系列生物炭材料(BC、KBC35%、KBC50%和KBC65%)。采用XRD、SEM、TEM、BET、FTIR等手段对生物炭的结构进行表征,并研究其对氨氮的吸附性能。结果表明:改性后生物炭呈现明显孔道结构,在pH为7、投加量为2.5 g/L、反应时间80 min时,KBC50%对氨氮吸附效果最佳,去除率达98.26%,吸附量为19.65 mg/g。动力学和等温吸附模型拟合结果表明,KBC50%符合准一阶动力学模型和Langmuir等温吸附模型,表明吸附为单分子层物理吸附为主。Using peanut shells as raw material and potassium carbonate as the modifier,a series of biochar materials(BC,KBC35%,KBC50%and KBC65%)were calcined in nitrogen at 500℃.The structures of the carbonmaterials were characterized by XRD,SEM,TEM,BET and FTIR,and their adsorption properties of ammonia nitrogen were studied.The results showed that the modified biomass carbon exhibited an obvious pore structure.When the pH was 7,the dosage was 2.5 g/L,and the reaction time was 80 min,the adsorption effect of KBC50%on ammonia nitrogen was the best,with a removal rate of 98.26%and an adsorption capacity of 19.65 mg/g.The fitting results of kinetic and isothermal adsorption models showed that KBC50%conforms to the quasi-first-order kinetic model and Langmuir isothermal adsorption model,indicating that the adsorption is mainly monolayer physical adsorption.

关 键 词：氨氮吸附 生物炭 花生壳 碳酸钾 

分 类 号：O643.36[理学—物理化学] TQ127[理学—化学]