海藻酸钠基吸附剂对阳离子染料吸附性能  

Adsorption Performance of Sodium Alginate-based Adsorbent for Cationic Blue X-GRRL

作　　者：孙后飞 张宾[1] 柳荣展[1,2] SU NHoufei;ZHANG Bin;LIU Rongzhan(College of Textiles and Clothing,Qingdao University,Qingdao 266071,China;Eco-textile Provincial and Ministerial Co-construction Collaborative Innovation Center,Qingdao 266071,China)

机构地区：[1]青岛大学纺织服装学院,山东青岛266071 [2]生态纺织省部共建协同创新中心,山东青岛266071

出　　处：《环境科学与技术》2023年第7期198-206,共9页Environmental Science & Technology

基　　金：山东省重点研发计划(重大科技创新工程)项目(2019JZZY010507,2019JZZY020301);国家自然科学基金(51508285)。

摘　　要：为对活性染料印花废水中海藻酸钠(SA)的资源化利用提供理论指导,文章以SA为原料、K2CO_(3)作为活化剂、ZnCl2为交联剂制备了海藻酸盐微球,再通过一步碳化活化法制备得到吸附剂(ZAC),采用SEM、BET、XRD及热重分析对ZAC的微观结构和形貌及微球的热解特性进行了表征,并将ZAC用于阳离子蓝X-GRRL染料的吸附脱色研究。结果表明:在碳化活化温度1000℃、K2CO_(3)与SA的质量比为1.5∶2的条件下制备的ZAC-1.5比表面积可达1269.17 m^(2)/g,总孔体积为1.63 cm^(3)/g,介孔率达84.66%,与未K2CO_(3)活化样品相比分别提高了26.17%、85.23%、46.09%。对浓度为250 mg/L的阳离子蓝X-GRRL溶液,在ZAC-1.5投加量0.20 g/L、吸附时间360min、吸附温度25℃、pH 5.3的条件下,吸附容量可达1174.55 mg/g。其吸附等温模型符合Langmuir模型,吸附动力学可由准二级动力学模型更好地描述。To provide a theoretical guidance for the resource utilization of sodium alginate(SA)in reactive dye printing wastewater,alginate microspheres were prepared by using SA as raw material,potassium carbonate as activator,and zinc chloride as cross-linking agent,then alginate-based adsorbent(ZAC)was obtained by using a facile one-step carbonization activation method.The microstructure and morphology of ZAC and the pyrolysis characteristics of microspheres were characterized by SEM,BET,XRD and thermogravimetric analysis.Also the adsorption performance of ZAC was evaluated for removing of cationic blue X-GRRL dye from its aqueous solution.The results showed that when the carbonized temperature was 1000℃and the mass ratio of K_(2)CO_(3)to SA was 1.5∶2,the ZAC-1.5 had a specific surface area of 1269.17 m^(2)/g,a total pore volume of 1.63 cm~3/g and a mesoporosity of 84.66%.Compared with non-activated sample,an increase of26.17%,85.23%and 46.09%respectively was observed.A high adsorption capacity of 1174.55 mg/g was obtained at pH5.3 for an adsorbent dose of 0.20 g/L of 250 mg/L dye concentration at 25℃for 360 min.Its adsorption thermodynamics conforms to Langmuir isothermal adsorption model,and the adsorption kinetics is well described by the pseudo-secondorder kinetic model.

关 键 词：海藻酸钠 碳化 活化 吸附剂 染料 

分 类 号：X703[环境科学与工程—环境工程]