自组装构筑MgO改性生物质炭及其磷吸附性能研究  

Electrostatic self-assembly to fabricate MgO-modified biochar for effective phosphate adsorption

作　　者：梁海 王婉婷 张欢 朱宝伟[1] 刘海燕[1] 王晓民[1] 陈英华 Liang Hai;Wang Wanting;Zhang Huan;Zhu Baowei;Liu Haiyan;Wang Xiaomin;Chen Yinghua(Liaoning Key Laboratory of Chemical Additive Synthesis and Separation,Yingkou Institute of Technology,Yingkou 115014,China;Liaoning Institute of Energy Resources Co.,Ltd.,Yingkou 115003,China)

机构地区：[1]营口理工学院辽宁化学助剂合成与分离重点实验室,辽宁营口115014 [2]辽宁省能源研究所有限公司,辽宁营口115003

出　　处：《可再生能源》2022年第2期152-159,共8页Renewable Energy Resources

基　　金：国家重点研发计划“固废资源化”专项(2020YFC1909300);辽宁省“兴辽英才计划”项目(XLYC2007185);辽宁省教育厅基本科研项目(LJKZ1202);辽宁省科学技术计划-区域创新联合基金项目(2020-YKLH-29);营口理工学院引进人才科研启动经费项目(YJRC202001)。

摘　　要：为了提升MgO改性生物质炭的磷吸附能力,文章以花生壳为载体,利用碱式碳酸镁前驱体自组装-热解技术制备了结构有序的花瓣状MgO改性生物质炭吸附剂(FMgO-BC)。采用SEM,EDS,XRD,IR和TG表征了制备的FMgO-BC的物相结构与表面形貌,并研究了水解温度和Mg;浓度对FMgO-BC吸附性能的影响。研究结果表明,当水解温度为80℃,Mg^(2+)浓度为0.6 mg/L时,FMgO-BC的吸附性能最优。文章还探究了FMgO-BC在不同pH值和加入量条件下的等温吸附模型和吸附动力学,研究结果表明,FMgO-BC的磷吸附动力学符合准二级动力学方程,等温吸附模型符合Langmuir等温吸附方程,理论最大吸附量为2221.89 mg/g,优于目前报道的MgO改性生物质炭的磷吸附性能。MgO-modified biochar is a low-cost and reusable phosphate adsorbent,while high performance for MgO-modified biochar is highly desired.In this study,flower-like MgO-modified biochar(FMgO-BC)was prepared by self-assembly-pyrolysis technique.The FMgO-BC exhibited excellent phosphate adsorption.The scanning electron microscope(SEM),Fourier infrared spectroscopy(FTIR),Thermal gravimetric analysis(TG)and X-rays diffraction analysis(XRD)were used to illustrate the physicochemical properties of FMgO-BC.The effects of reaction temperature and reaction concentration on the adsorption performance were investigated using batch adsorption experiments.It was found that FMgO-BC prepared under reaction temperature of 80℃and Mg^(2+)concentration of 0.6 mg/L was most effective in phosphate removal.Then the isothermal adsorption and adsorption kinetics of FMgO-BC at different pH and dosage were further investigated,and the results showed that the phosphate adsorption kinetics of FMgO-BC were in accordance with the pseudo-second order kinetic equation.The isothermal adsorption model was consistent with the Langmuir isothermal adsorption equation,and the theoretical maximum adsorption capacity was 2221.89 mg/g,which was higher than the currently reported phosphorus adsorption performance of MgO-modified biochar.

关 键 词：氧化镁 生物质炭 自组装 磷 吸附 

分 类 号：TK6[动力工程及工程热物理—生物能]