两性纤维素基吸附剂的制备及其对水体中氮磷污染物的去除  

Preparation of Amphoteric Cellulose Based Adsorbent and Its Removal of Nitrogen and Phosphorus Pollutants from Wastewater

作　　者：孙英南 刘苏珍 李海明 周景蓬[3] 张凤山[3] 郭延柱 SUN Yingnan;LIU Suzhen;LI Haiming;ZHOU Jingpeng;ZHANG Fengshan;GUO Yanzhu(College of Light Industry and Chemical Engineering,Dalian Polytechnic University/Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials/Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery,Dalian 116034,China;Department of Marine Biochemistry,Shandong Industrial Technician College,Weifang 261053,China;Huatai Group Co.Ltd.,Dongying 257335,China)

机构地区：[1]大连工业大学轻工与化学工程学院,辽宁省生物质化学与材料重点实验室,辽宁木质纤维生物质精炼协同创新中心,辽宁大连116034 [2]山东工业技师学院海洋生化系,山东潍坊261053 [3]华泰集团有限公司,山东东营257335

出　　处：《林产化学与工业》2023年第2期143-152,共10页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金面上项目(22078036);中国博士后科学基金资助项目(2021M691106);山东博士后创新项目(202102050)。

摘　　要：以纤维素为原料,以甲基丙烯酰氧乙基三甲基氯化铵(METAC)、丙烯酰胺(AM)、2-丙烯酰胺基-2-甲基-1-丙烷磺酸(AMPS)为单体,过硫酸钾为引发剂,通过一步自由基聚合法制备得到两性纤维素基共聚物(CO-AC)吸附剂。采用元素分析仪、红外光谱(FT-IR)仪对CO-AC的结构与性能进行了表征,发现季胺基、酰胺基和磺酸基等活性基团成功被引入到纤维素分子链中。以CO-AC对NH_(4)^(+)和H_(2)PO_(4)^(-)的去除率和平衡吸附量为考核指标,对吸附条件进行了优化,探讨了不同因素对吸附效果的影响。研究结果表明:当纤维素葡萄糖单元与AMPS、AM和METAC的物质的量之比为1∶2∶3∶3时,制备的吸附剂吸附效果最佳。在50 mL质量浓度为150 mg/L的NH_(4)^(+)和H_(2)PO_(4)^(-)溶液中,当CO-AC添加量为100 mg,pH值为7时,对NH_(4)^(+)的最大吸附量为77.4 mg/g;当CO-AC添加量为100 mg,pH值为5时,对H_(2)PO_(4)^(-)的最大吸附量为61.2 mg/g。CO-AC对NH_(4)^(+)和H_(2)PO_(4)^(-)的吸附过程较好地符合准二级动力学模型、粒子内部扩散模型和Langmuir模型,说明化学吸附和粒子内部扩散过程是主要的限速步骤,吸附过程是均匀的单分子层吸附。Amphoteric cellulose copolymers(CO-AC)adsorbents were prepared though free radical polymerization in one-pot process using cellulose as raw material and methacryloxyethyl trimethyl ammonium chloride(METAC),acrylamide(AM),2-acryloamino-2-methyl-1-propane sulfonic acid(AMPS)as monomers and potassium persulfate as initiator.The structure and properties of CO-AC were characterized by elemental analyzer and fourier infrared spectrometer(FT-IR).It was found that active groups,e.g.,quaternary amine,amide and sulfonic acid group were successfully introduced into the molecular chains of cellulose.Taking the removal rate and equilibrium adsorption capacity of CO-AC to NH_(4)^(+) and H_(2)PO_(4)^(-) as the evaluation indexes,the adsorption conditions were optimized and the influence of various factors on the adsorption capacity of CO-AC were also evaluated.The results showed that the adsorption capacity of the adsorbent,derived under the conditions of 1∶2∶3∶3 molar ratio of cellulose glucose unit to AMPS,AM and METAC,was the best.In 50 mL of NH_(4)^(+) and H_(2)PO_(4)^(-) solution with a mass concentration of 150 mg/L,the maximum adsorption capacity of NH_(4)^(+) was 77.4 mg/g when the addition amount of CO-AC was 100 mg and pH value was 7.0.The maximum adsorption capacity of H 2PO-4 was 61.2 mg/g,while the addition amount was 100 mg and the pH value was 5.0.The adsorption process of NH_(4)^(+) and H_(2)PO_(4)^(-) on CO-AC was well characterized by the quasi-second-order kinetic,internal diffusion of particle and Langmuir models,indicating that chemisorption and internal particle diffusion processes were the main rate-limiting steps,and the adsorption process was homogeneous monolayer adsorption.

关 键 词：纤维素 改性 两性吸附剂 氮磷吸附 

分 类 号：TQ35[化学工程]