不同密度海藻酸钙复合微球的制备及其对Cu(Ⅱ)吸附行为的研究  

Preparation of Calcium Alginate Composite Microspheres with Different Densities and Their Adsorption Behavior for Cu(Ⅱ)

作　　者：詹李明 李建华 黄雅雯 蓝森美 冯芳芳 陈作义[1] 柳晓俊 赵丹华[1] ZHAN Liming;LI Jianhua;HUANG Yawen;LAN Senmei;FENG Fangfang;CHEN Zuoyi;LIU Xiaojun;ZHAO Danhua(College of Chemistry and Materials Science,Guangdong University of Education,Guangzhou 510303,China)

机构地区：[1]广东第二师范学院化学与材料科学学院,广东广州510303

出　　处：《化学与生物工程》2022年第8期25-31,共7页Chemistry & Bioengineering

基　　金：广东省普通高校特色创新项目(2019KTSCX118);华南理工大学传热强化与过程节能教育部重点实验室开放基金项目(202000110);大学生创新实验项目(S202014278021,S202114278024)。

摘　　要：以乙二胺四乙酸二钠(EDTA-2Na)/CaCO_(3)、海藻酸钠为原料,以氯化钙为固化剂,调控EDTA-2Na与CaCO_(3)、海藻酸钠与EDTA-2Na/CaCO_(3)的配比,采用原位化学交联法制备了不同密度海藻酸钙复合微球FCAM、ICAM,通过扫描电镜和红外光谱对其形貌和结构进行了分析;并将复合微球FCAM、ICAM用于含Cu(Ⅱ)废水的吸附,考察了复合微球投加量、Cu(Ⅱ)初始浓度、吸附时间、体系pH值等对吸附效果的影响,探究了吸附动力学及吸附热力学.结果表明,室温下,在复合微球投加量为1.32g·L^(-1)、Cu(Ⅱ)初始浓度为90mg·L^(-1)、吸附时间为300min、体系pH值为5时,复合微球ICAM对Cu(Ⅱ)的吸附量为61.84mg·g^(-1).复合微球的制备工艺简单,成本低,在常温下对Cu(Ⅱ)具有较高的吸附效率;吸附过程符合准二级动力学方程,在一定条件下,反应速率受Cu(Ⅱ)浓度和复合微球表面活性吸附位点控制;吸附过程符合Freundlich等温吸附方程,可自发进行,升高温度有利于吸附.Using disodium ethylenediamineteraacetate(EDTA-2 Na)/CaCO_(3) and sodium alginate as raw materials,CaCl_(2) as a curing agent,and adjusting the ratios of EDTA-2 Na to CaCO_(3) and sodium alginate to EDTA-2 Na/CaCO_(3),we prepared calcium alginate composite microspheres FCAM and ICAM with different densities by in-situ chemical crosslinking method,and analyzed their morphologies and structures by scanning electron microscope and infrared spectroscopy.Moreover,we used the composite microspheres FCAM and ICAM for the adsorption of Cu(Ⅱ)-containing wastewater,investigated the effects of dosage of the composite microspheres,initial concentration of Cu(Ⅱ),adsorption time,and pH value of system on the adsorption,and explored the adsorption kinetics and adsorption thermodynamics.The results show that,at room temperature,the adsorption capacity of the composite microsphere ICAM for Cu(Ⅱ)is 61.84 mg·g^(-1) when the dosage of the composite microsphere is 1.32 g·L^(-1),the initial concentration of Cu(Ⅱ)is 90 mg·L^(-1),the adsorption time is 300 min,and the pH value of system is 5.The preparation process of the composite microspheres is simple,the cost is low,and the adsorption efficiency for Cu(Ⅱ)is high at room temperature.The adsorption process accords with the pseudo-second-order kinetic equation,and the reaction rate is controlled by the Cu(Ⅱ)concentration and the surface active adsorption sites of the composite microspheres under certain conditions.The adsorption process conforms to Freundlich isothermal adsorption equation,and the adsorption can proceed spontaneously.Increasing the temperature is conducive to the adsorption.

关 键 词：海藻酸钠 重金属 铜离子 乙二胺四乙酸二钠(EDTA-2Na) 吸附 

分 类 号：TQ424[化学工程] O647.3[理学—物理化学] X52[理学—化学]