摘要
首先,以阳离子交换树脂为原料、NH_(4)HCO_(3)为N源制备了碳前驱体;然后,经850℃高温活化制备了N掺杂树脂基球形多孔炭(NSAC)。采用BET、SEM、FTIR、XPS、纳米粒度与Zeta电位分析仪对NSAC进行了表征。将NSAC用于水体中盐酸金霉素(CTC)和左氧氟沙星(LEV)的吸附去除,考察了高温活化时间对NSAC吸附性能的影响。结果表明,NSAC具有球状分级多孔结构;经850℃高温活化2.0 h制备的NSAC2.0的比表面积和总孔体积最大,分别为1612 m^(2)/g和1.39 cm^(3)/g,平均孔径为3.50 nm,非微孔孔容占比达到47%,是一种分级多孔炭材料;NSAC2.0对CTC和LEV的吸附等温线符合Langmuir模型,吸附动力学符合拟二级动力学模型;根据Langmuir模型计算得出,NSAC2.0对CTC和LEV的最大理论吸附量分别为397和645 mg/g;NSAC2.0的零电位(pH_(PZC))为5.10,在较大的pH范围(1~10)内能保持稳定的吸附能力。NSAC2.0表面有丰富的含C、O和N的官能团,可以与CTC和LEV分子发生静电相互作用、氢键作用、π-π相互作用以及孔隙填充效应,实现对水体中CTC和LEV的吸附去除。NSAC2.0经过5次循环后,对CTC和LEV的吸附量仍有148.7和311.6 mg/g,具有良好的重复使用性。
N-doped resin-based spherical carbon(NSAC)was prepared by high-temperature activation a carbon precursor,obtained from cation exchange resin as raw material and NH_(4)HCO_(3)as nitrogen source,at 850℃,and characterized by BET,SEM,FTIR,XPS,nanoparticle size and Zeta potential analyzer.The NSAC was used for the adsorption and removal of hydrochloric acid chlortetracycline(CTC)and levofloxacin(LEV)from water to analyze the influence of high-temperature activation time on its adsorption performance.The results showed that NSAC exhibited a spherical,hierarchical porous structure.The NSAC2.0 prepared by high-temperature activation at 850℃for 2.0 h displayed the largest specific surface area of 1612 m^(2)/g,total pore volume of 1.39 cm^(3)/g,an average pore diameter of 3.50 nm,and a non-mesopore pore volume proportion of 47%,making it a hierarchical porous carbon material.The adsorption isotherms of NSAC2.0 for CTC and LEV fitted to the Langmuir model,and the adsorption kinetics followed a pseudo-second-order model.The maximum theoretical adsorption capacities of NSAC2.0 for CTC and LEV were 397 and 645 mg/g,respectively,based on calculation from Langmuir model.The zero-point charge(pH_(PZC))of NSAC2.0 was 5.10,and it maintained stable adsorption capacity over a wide pH range(1~10).The surface of NSAC2.0 was rich in functional groups containing C,O,and N,which could interact with CTC and LEV molecules through electrostatic adsorption,hydrogen bonding,π-πinteractions,and pore-filling effects,thereby facilitating the adsorption and removal of CTC and LEV from water.NSAC2.0 had good reusability,after 5 cycles,the adsorption capacity for CTC and LEV remained at 148.7 and 311.6 mg/g,respectively.
作者
余谟鑫
朱雨
吕宋琢璞
张晨
柯清平
王晓婷
YU Moxin;ZHU Yu;LYU Songzhuopu;ZHANG Chen;KE Qingping;WANG Xiaoting(School of Chemistry and Chemical Engineering,Anhui University of Technology,Ma'anshan 243000,Anhui,China;Sinosteel New Materials Co.,Ltd.,Ma'anshan 243000,Anhui,China;Magang(Group)Holding Co.,Ltd.,Ma'anshan 243000,Anhui,China)
出处
《精细化工》
北大核心
2025年第10期2251-2261,2287,共12页
Fine Chemicals
基金
安徽省博士后科研项目(2021B547)
安徽省高校自然科学研究项目(KJ2021A0399)。
关键词
球形炭
阳离子交换树脂
N掺杂
盐酸金霉素
左氧氟沙星
水处理技术
spherical carbon
cation exchange resin
N-doping
hydrochloric acid chlortetracycline
levofloxacin
water treatment technology
