木质素磺酸钠基水凝胶吸附剂的制备及其对刚果红的吸附性能  

Preparation of sodium lignosulfonate based hydrogel adsorbent and its adsorption properties for Congo red

作　　者：田妮妮 李瑞超 姜建堂[2] 倪华钢[1] 宗鑫桐 汪玉美 宗良 TIAN Nini;LI Ruichao;JIANG Jiantang;NI Huagang;ZONG Xintong;WANG Yumei;ZONG Liang(School of Science,Zhejiang Sci-Tech University,Hangzhou 310018,China;College of Textile Science and Engineering(International Institute of Silk),Zhejiang Sci-Tech University,Hangzhou 310018,China;Zhejiang Saige Dyeing and Finishing Co.,Ltd.Jinhua 321035,China)

机构地区：[1]浙江理工大学理学院,杭州310018 [2]浙江理工大学纺织科学与工程学院(国际丝绸学院),杭州310018 [3]浙江赛格染整股份有限公司,浙江金华321035

出　　处：《浙江理工大学学报（自然科学版）》2022年第6期882-892,共11页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：浙江省教育厅科研项目(Y202147803);金华市重大(重点)科学技术研究计划项目(2021-3-168)。

摘　　要：为了快速高效地去除废水中的有机染料污染物,以木质素磺酸钠(Sodium lignin sulfonate, SLS)为原料,将其胺化后与超支化聚酰胺(Hyperbranched polyamide, HP)混合,经聚乙二醇二缩水甘油醚(Polypropylene glycol diglycidyl ether, PEGDGE)引发交联反应,制备了木质素磺酸钠/超支化聚酰胺复合水凝胶吸附剂(Lignosulfonate/hyperbranched polyamide composite hydrogel adsorbent, NHP-n(n为交联剂用量,n=2,3,4,5))。采用FTIR、XPS和SEM等手段对吸附剂的特征官能团、表面组成及形貌进行了表征,以刚果红(Congo red, CR)为模型污染物,考察了不同交联剂用量下制备的吸附剂对CR的吸附性能。优选出NHP-4,探究了染料初始浓度、吸附时间、吸附剂用量和体系pH对吸附CR性能的影响,并探究了NHP-4的吸附机理及重复利用性能。结果表明:在染料初始质量浓度为6000 mg/L、pH为4~5、温度为35℃,吸附剂NHP-4用量为0.8 g/L时,制备所得吸附剂对CR的实际最大吸附量可达5118 mg/g,吸附3 h后达到吸附平衡。NHP-4对CR的吸附为自发吸热过程,符合Langmuir等温吸附模型和伪二级动力学模型。NHP-4对CR高效去除,其原因主要是吸附材料与染料的强静电相互作用以及吸附材料的丰富孔结构和大量吸附位点。重复使用5次后,NHP-4对CR去除率仍保持在96%以上。该研究为水中有机污染物去除用高性能生物质基吸附剂的制备提供了新方法。In order to quickly and efficiently remove the organic dye pollutants in the wastewater, sodium lignin sulfonate(SLS) was used as the raw material to be mixed with hyperbranched polyamide(HP) and to arouse crosslinked reaction with polyethylene glycol diglycidyl ether(PEGDGE), and the lignosulfonate/hyperbranched polyamide composite hydrogel adsorbent(NHP-n, n is the amount of crosslinker, and n=2,3,4,5) was prepared. The characteristic functional group, surface composition and morphology of the adsorbent were characterized by FTIR, XPS and SEM. Congo red(CR) was used as a model pollutant to investigate the adsorption performance of the adsorbent prepared with different amounts of crosslinking agent on CR. NHP-4 was optimized, and the effects of initial concentration of dye, adsorption time, the amount of adsorbent and pH of the system on the adsorption properties of CR were investigated. The adsorption mechanism and reusability of NHP-4 were also investigated. The results showed that when the initial concentration of dye was 6000 mg/L, pH was 4~5, temperature was 35 ℃, and the amount of adsorbent NHP-4 was 0.8 g/L, the actual maximum adsorption capacity could reach 5118 mg/g, and the adsorption equilibrium could be reached in 3 h. The adsorption of Congo red(CR) by NHP-4 is a spontaneous endothermic process, which conforms to Langmuir isothermal adsorption model and the quasi-second-order kinetic model. The main reasons for the efficient removal of CR by NHP-4 are attributed to the strong electrostatic interaction between the adsorbent and dye, the rich pore structure and a large number of adsorption sites of the adsorbent. The CR removal rate remained at about 96% after five times of repeated use. The results of this study provide a new method for the preparation of high-performance biomass-based adsorbents for the removal of organic pollutants from water.

关 键 词：木质素磺酸钠 超支化聚酰胺 水凝胶 刚果红 吸附 有机污染物 

分 类 号：O636.2[理学—高分子化学]