疏水纤维素柔性凝胶材料吸附苯酚性能研究

Research on Adsorption of Phenol by Hydrophobic Cellulose Flexible Gel Materials

关键词:  纤维素  苯酚废水  柔性凝胶  吸附

Key Words:cellulose  phenol wastewater  flexible gel  adsorption

摘要:以粉末状纤维素和丙烯酰胺为单体，过硫酸钾为引发剂，N, N-亚甲基双丙烯酰胺为交联剂，制备了纤维素柔性凝胶材料（MPCs），经疏水改性处理后得到疏水纤维素柔性凝胶材料（T-MPCs），并用于吸附分离溶液中的苯酚。通过改变苯酚溶液pH值、初始浓度和吸附剂添加量，研究T-MPCs吸附苯酚的影响因素和吸附机理。结果表明，T-MPCs是一种表面多孔的柔性凝胶材料，在吸附温度25 ℃、溶液pH值7.0、吸附时间360 min、初始浓度200 mg/L的条件下，T-MPCs添加量为1000 mg/L时，其对苯酚的平衡吸附量为148.9 mg/g，吸附过程符合准二级动力学模型及Freundlich等温吸附模型，具有良好的再生能力，5次循环再生后，T-MPCs吸附性能下降15.2%。

Abstract:Cellulose flexible gel materials （MPCs） were prepared with cellulose powder and acrylamide as monomers， potassium persulfate as initiator and N，N-methylene diacrylamide as crosslinking agent. Then hydrophobic cellulose flexible gel materials （T-MPCs） were prepared via hydrophobic modification for MPCs and used to adsorb and separate phenol in solution. The influence factors， adsorption machanism of phenol adsorption by T-MPCs were studied by changing the pH value of solution， initial concentration of phenol solution， and adsorbent dosage. The results showed that T-MPCs were flexible gel materials with porous surface. The equilibrium adsorption capacity of phenol by T-MPCs was 148.9 mg/g， when the adsorption temperature was 25 ℃， pH value of solution 7.0， adsorption time 360 min， initial concentration of phenol 200 mg/L， and T-MPCs dosage 1000 mg/L. The adsorption process was in accordance with the pseudo-second order kinetic and Freundlich isothermal adsorption models. The adsorption capacity of phenol by T-MPCs decreased by 15.2% after 5 cycles of regeneration， indicating it is of good regeneration ability.