张陶,桂晓慧,陈腾飞,周景蓬,李海明,王兴,郭延柱,张凤山.宽pH值适应性木质素絮凝剂的制备及其对乳化含油废水的处理[J].中国造纸学报,2022,37(3):28-36 |
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宽pH值适应性木质素絮凝剂的制备及其对乳化含油废水的处理 |
Synthesis of Lignin-based Flocculants with Wide pH Adaptability and Its Treatment on Wastewater Containing Emulsified Oil |
投稿时间:2021-09-15 |
DOI:10.11981/j.issn.1000-6842.2022.03.28 |
中文关键词: 木质素 阳离子 絮凝剂 乳化含油废水 |
Key Words:lignin cationic flocculant emulsified-oil wastewater |
基金项目: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。 |
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中文摘要: |
以预水解木质素为原料,甲基丙烯酰氧乙基三甲基氯化铵(METAC)和丙烯酰胺(AM)为接枝单体,过硫酸钾(KPS)为引发剂,通过接枝聚合反应制备了阳离子型木质素三元接枝聚合物(LAM),探讨了pH值、KPS用量、METAC/木质素摩尔比、AM/木质素摩尔比等对LAM电荷密度、溶解度和接枝率的影响,并利用傅里叶变换红外光谱(FT-IR)、电荷滴定等技术对LAM的结构和性能进行表征。结果表明,在pH值为5、KPS用量为4.0 wt%、METAC/木质素摩尔比为2.5、AM/木质素摩尔比为2.5条件下制备的LAM性能最优,电荷密度为2.38 mmol/g,溶解度为8.92 g/L,METAC和AM的接枝率分别为166.2%和70.1%;与木质素接枝METAC二元聚合物相比,LAM对废水中乳化油具有优异的絮凝效果,去除率达91%以上且表现出宽pH值适应性。 |
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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