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Synthesis of Lignin-based Flocculants with Wide pH Adaptability and Its Treatment on Wastewater Containing Emulsified Oil
Received:September 15, 2021  
DOI:10.11981/j.issn.1000-6842.2022.03.28
Key Words:lignin;cationic;flocculant;emulsified-oil wastewater
Fund Project:国家自然科学基金面上项目(22078036);辽宁省兴辽英才计划青年拔尖人才项目(XLYC1807232);中国博士后科学基金第69批面上资助二等(2021M691106);山东省博士后创新项目二等。
Author NameAffiliationPostcode
ZHANG Tao Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 116034
GUI Xiaohui Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 116034
CHEN Tengfei Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034
Shandong Bohui Paper Industrial Co.?, Ltd., Zibo, Shandong Province, 256405 
256405
ZHOU Jingpeng Shandong Huatai Paper Co.?, Ltd., Dongying, Shandong Province 257335
LI Haiming Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 116034
WANG Xing Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034 116034
GUO Yanzhu Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian, Liaoning Province, 116034
Shandong Bohui Paper Industrial Co.?, Ltd., Zibo, Shandong Province, 256405
Shandong Huatai Paper Co.?, Ltd., Dongying, Shandong Province 
257335
ZHANG Fengshan Shandong Huatai Paper Co.?, Ltd., Dongying, Shandong Province 257335
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Abstract:
      The cationic lignin ternary graft polymer (LAM) was prepared by radical polymerization reaction using pre-hydrolyzed lignin as raw material, [2-(methacryloyloxy) ethyl] trimethylammonium chloride (METAC) and acrylamide (AM) as graft monomers, and potassium persulfate (KPS) as initiator. The effects of pH value, KPS dosage, METAC/lignin molar ratio, AM/lignin molar ratio, and other conditions on the charge density, solubility, and grafting rate of LAM were investigated; the structure and properties of LAM were characterized by Fourier transform infrared spectroscopy (FT-IR), charge titration, etc. The results showed that LAM prepared at pH value of 5, KPS dosage 4.0 wt%, METAC/lignin molar ratio 2.5, and AM/lignin molar ratio 2.5 had the optimum performance with a charge density of 2.38 mmol/g, solubility of 8.92 g/L, graft ratio of 166.2% for METAC and 70.1% for AM. Compared with the lignin-grafted METAC binary polymer, LAM showed a wide range of pH adaptability and had an excellent flocculation effect on emulsified-oil in wastewater, with removal rate of over 91%.
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