Structure engineering of Zn-ZIF adsorbents for efficient and highly-selective phosphate removal from wastewater: Roles of surface mesopore and defect

介孔材料 吸附 磷酸盐 沸石咪唑盐骨架 废水 化学工程 化学 比表面积 咪唑酯 核化学 材料科学 无机化学 金属有机骨架 催化作用 有机化学 废物管理 工程类
作者
Haichuan Zhang,Chou Huang,H. H. Zhang,Xiang Li,Shirui Yue,Zhizhang Shen,Ji Li
出处
期刊:Applied Surface Science [Elsevier BV]
卷期号:586: 152814-152814 被引量:13
标识
DOI:10.1016/j.apsusc.2022.152814
摘要

The ability to purposely manipulate the material structure is vital in developing an efficient adsorbent for phosphate-selective removal from wastewater. Defects and mesopores play dominating roles in improving the adsorption performance of zinc-based zeolitic imidazolate frameworks (Zn-ZIF). In this work, nonporous leaf-like ZIF (ZIF-L) precursor was treated by a facile solvothermal method to successfully prepare defect-rich mesoporous Zn-ZIF materials. Among them, the optimized Zn-ZIF-72 exhibited the highest capacity of 102 ± 2 mg g−1 (only 75 ± 3 mg g−1 of ZIF-L) due to its strong electrostatic attraction from more positive surface charge (34.65 mV at pH = 5) and abundant available Zn-defect sites via well-developed mesopores. Yet the mass transfer resistance in newly-formed pores led to a slightly slow kinetics of 0.01 g mg−1 min−1 for Zn-ZIF-72. Moreover, >90% of phosphate-adsorbed efficiencies of Zn-ZIF-72 were achieved even under the interfering effect of seven common coexisting matters (e.g., CO32− and humic acid) of 100 times concentration, mainly attributing to specific inner-sphere complexation of surface Zn-defects with phosphate species. Furthermore, to achieve the effluent P < 0.5 mg L−1 in real wastewater treatment, about 885 bed volume (BV) by using Zn-ZIF-72 adsorbent was much higher than ∼710 BV by ZIF-L. Thus, this work offers a novel strategy for designing highly-effective phosphate adsorbents through structure engineering.
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