首页|ZIF-8-DMTD@ALG气凝胶制备及对Pb(Ⅱ)、Cd(Ⅱ)吸附性能研究

ZIF-8-DMTD@ALG气凝胶制备及对Pb(Ⅱ)、Cd(Ⅱ)吸附性能研究

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文章利用合成后改性法将2,5-二巯基-1,3,4-噻二唑(DMTD)引入沸石咪唑酯骨架材料(ZIF-8),通过共混法将其与海藻酸钠(ALG)复合成功制备出ZIF-8-DMTD@ALG气凝胶.ZIF-8-DMTD@ALG气凝胶解决了粉末状吸附剂易团聚和难以回收的问题,DMTD的引入为ZIF-8-DMTD@ALG气凝胶带来丰富的官能团,从而提高其吸附性能.静态批量吸附实验表明:ZIF-8-DMTD@ALG气凝胶对Pb(Ⅱ)和Cd(Ⅱ)的吸附均遵循准二级动力学模型和Langmuir吸附等温模型;Langmuir模型拟合出的ZIF-8-DMTD@ALG对Pb(Ⅱ)和Cd(Ⅱ)的最大吸附容量分别达到352.101、170.592 mg/g.离子强度实验和循环吸附实验表明ZIF-8-DMTD@ALG气凝胶具有良好的耐盐性能和再生能力.表征技术和批量吸附实验结果揭示了ZIF-8-DMTD@ALG气凝胶主要通过络合作用吸附Pb(Ⅱ)和Cd(Ⅱ),少量的离子交换和静电作用也对吸附做出了贡献.该研究结果表明ZIF-8-DMTD@ALG气凝胶具有制备简单、回收容易和吸附能力强等优点,在实际污水处理领域有良好的应用前景.
Preparation of ZIF-8-DMTD@ALG aerogels and their adsorption properties towards Pb(Ⅱ)and Cd(Ⅱ)
In this paper,2,5-dimercapto-1,3,4-thiadiazole(DMTD)was introduced into zeolitic imid-azolate framework material(ZIF-8)by post-synthesis modification method,and then combined with sodium alginate(ALG)by blending method to prepare ZIF-8-DMTD@ALG aerogels.ZIF-8-DMTD@ALG aerogels solve the problems that powder adsorbents are easy to agglomerate and difficult to recov-er.The introduction of DMTD brings abundant functional groups to ZIF-8-DMTD@ALG aerogels and improves their adsorption performance.The static batch adsorption experiments showed that the ad-sorption of Pb(Ⅱ)and Cd(Ⅱ)by ZIF-8-DMTD@ALG aerogels followed the quasi-second-order ki-netic model and Langmuir adsorption isothermal model.The maximum adsorption capacities of ZIF-8-DMTD@ALG for Pb(Ⅱ)and Cd(Ⅱ)obtained by Langmuir model reached 352.101 mg/g and 170.592 mg/g,respectively.Ionic strength experiments and cyclic adsorption experiments showed that ZIF-8-DMTD@ALG aerogels had good salt resistance and regeneration ability.Characterization techniques and batch adsorption experiments revealed that ZIF-8-DMTD@ALG aerogels mainly ad-sorbed Pb(Ⅱ)and Cd(Ⅱ)through complexation,and a small amount of ion exchange and electro-static interaction also contributed to the adsorption.The results show that ZIF-8-DMTD@ALG aero-gels have the advantages of simple preparation,easy recovery and strong adsorption capacity,and have a good application prospect in the field of sewage treatment.

post-synthesis modification methodZIF-8aerogelsodium alginate(ALG)adsorption

侯慧、郭志强、周剑、吴新苗

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合肥工业大学资源与环境工程学院,安徽 合肥 230009

合成后改性法 ZIF-8 气凝胶 海藻酸钠(ALG) 吸附

2024

合肥工业大学学报(自然科学版)
合肥工业大学

合肥工业大学学报(自然科学版)

CSTPCD北大核心
影响因子:0.608
ISSN:1003-5060
年,卷(期):2024.47(12)