改性硅藻土负载亚铁氰化铜复合物的制备及其对Cs^(+)的吸附性能  

Preparation and adsorption properties for Cs^(+)of modified diatomite-supported copper hexacyanoferrate composite

作　　者：郭雪琴 邓小川[1,2] 朱朝梁 扶鑫[4] 王瑞瑞 马婉霞 樊洁 左方涛 卿彬菊[1,2] GUO Xue-Qin;DENG Xiao-Chuan;ZHU Chao-Liang;FU Xin;WANG Rui-Rui;MA Wan-Xia;FAN Jie;ZUO Fang-Tao;QING Bin-Ju(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China;Qinghai Engineering and Technology Research Center of Comprehensive Utilization of Salt Lake Resources,Xining 810008,China;University of Chinese Academy of Sciences,Beijing 100049,China;Hangzhou Water Treatment Technology Development Center,Hangzhou 310012,China)

机构地区：[1]中国科学院青海盐湖研究所,盐湖资源综合高效利用重点实验室,西宁810008 [2]青海省盐湖资源开发工程技术研究中心,西宁810008 [3]中国科学院大学,北京100049 [4]杭州水处理技术研究开发中心有限公司,杭州310012

出　　处：《无机化学学报》2023年第5期815-829,共15页Chinese Journal of Inorganic Chemistry

摘　　要：采用水热法、以氯化铝为铝源对硅藻土(De)进行改性,通过浸渍法将亚铁氰化铜(KCu HCF)纳米颗粒负载于改性De表面,制备出γ-Al OOH/De-KCu HCF和γ-Al_(2)O_(3)/De-KCu HCF两种复合吸附剂,对所制备的吸附剂进行了表征,并研究了其对Cs^(+)的吸附性能。结果表明,所制备吸附剂具有优异的Cs^(+)吸附性能,γ-Al OOH/De-KCu HCF和γ-Al_(2)O_(3)/De-KCu HCF最高吸附容量分别可达75.44、84.02 mg·g^(-1),γ-Al_(2)O_(3)/De-KCu HCF对模拟卤水中Cs^(+)的吸附率高达97.55%;以3 mol·L^(-1)NH_(4)NO_(3)为脱附剂,经3级连续脱附后,γ-Al_(2)O_(3)/De-KCu HCF的Cs^(+)脱附率可达81.88%,经过5次吸附-脱附循环后仍保持了较高的吸附量。Herein,aluminum chloride was used as the aluminum source to modify diatomite(De)by hydrothermal method.Copper hexacyanoferrate(KCuHCF)nanoparticles were loaded onto the surface of modified De by the impregnation method,and two composite adsorbents,γ-AlOOH/De-KCuHCF andγ-Al_(2)O_(3)/De-KCuHCF,were prepared.The prepared materials were characterized and used for Cs^(+)adsorption.The results showed that the prepared adsorbents had better adsorption performance for Cs^(+).The maximum adsorption capacity can reach 75.44 and 84.02 mg·g^(-1),respectively.The desorption rate ofγ-Al_(2)O_(3)/De-KCuHCF can reach 81.88%after three consecutive desorption with 3 mol·L^(-1) NH_(4)NO_(3) as the desorption solution and the Cs^(+)adsorption rate ofγ-Al_(2)O_(3)/De-KCuHCF in simulated brines was as high as 97.55%.After five adsorption-desorption cycles the adsorption capacity remained high.The adsorption kinetic process and adsorption isotherm model of the prepared adsorbent were also analyzed.The results showed that the adsorption process was in line with the quasi‑second‑order kinetic model,which was controlled by the intra‑particle diffusion and liquid film diffusion,and was in line with the Langmuir adsorption isotherm model.

关 键 词：氯化铝 硅藻土 亚铁氰化铜 Cs^(+)吸附 

分 类 号：TQ127.2[化学工程—无机化工] TL941[核科学技术—辐射防护及环境保护]