改性磁性生物炭对亚甲基蓝吸附性能的研究  

Study on the adsorption performance of modified magnetic biochar on methylene blue

作　　者：李伟[1] 李英教 林常[1] 宋辉 徐树英[1] LI Wei;LI Yingjiao;LIN Chang;SONG Hui;XU Shuying(School of Chemistry and Chemical Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学化学化工学院,海口570228

出　　处：《化学工业与工程》2024年第6期110-119,共10页Chemical Industry and Engineering

基　　金：海南省自然科学基金高层次人才项目(521RC500)

摘　　要：采用(CH_(3)COO)_(2)Zn对磁性生物炭进行了改性,制备了改性磁性生物炭MBC600。对改性前后的磁性生物炭进行了表征,并对水溶液中的亚甲基蓝(MB)进行了吸附实验。结果表明,(CH_(3)COO)_(2)Zn改性后的磁性生物炭MBC600的比表面积从381.4提升为799.7 m^(2)·g^(-1),孔隙体积从0.27提升为0.46 cm^(3)·g^(-1),饱和磁化强度从13.20提升为18.18 emu·g^(-1)。MBC600在25℃下对MB的最大吸附量为344.06 mg·g^(-1),是未改性的5倍。通过对MBC600吸附的动力学和热力学拟合,发现MBC600对MB的吸附速率主要是化学吸附控制下的单分子吸附。MB的吸附是通过氢键作用和阳离子交换而实现。In this study,magnetic biochar was modified using(CH_(3)COO)_(2)Zn to prepare modified magnetic biochar MBC600.The magnetic biochar samples before and after modification was characterized and adsorption experiments were carried out on methylene blue(MB)in aqueous solution.The results showed that the specific surface area of(CH_(3)COO)_(2)Zn-modified magnetic biochar MBC600 was enhanced from 381.4 to 799.7 m^(2)·g^(-1),the pore volume from 0.27 to 0.46 cm^(3)·g^(-1),and the saturated magnetization intensity from 13.20 to 18.18 emu·g^(-1).The maximum adsorption of MB by MBC600 at 25℃was 344.06 mg·g^(-1),which was 4 times higher than that of the unmodified.The kinetic and thermodynamic fitting of the adsorption of MBC600 revealed that the adsorption of MB by MBC600 was mainly a monomolecular adsorption under the control of chemisorption.MB adsorption is via hydrogen bonding and cation exchange.

关 键 词：磁性生物炭 比表面积 吸附量 氢键作用 

分 类 号：TQ448.21[化学工程—化学肥料工业]