期刊
CHEMICAL ENGINEERING JOURNAL
卷 428, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132536
关键词
Phosphate removal; Metal-organic framework-incorporated carbon; heterostructure; Adsorption; Ligand exchange
资金
- National Natural Science Foundation of China [52000004]
The ZIF8@rGO heterostructures prepared through dimensional engineering exhibit excellent phosphate removal efficiency, with significantly higher maximum adsorption capacity and partition coefficient values compared to existing adsorbents, mainly attributed to the two-dimensional graphene support providing a more effective anchoring surface for ZIF8.
Developing metal-organic framework-incorporated carbon heterostructure (MOF@C) adsorbents with advanced phosphate removal capability is of remarkable significance in satisfying the increasingly stringent wastewater discharge criteria. Nevertheless, the tailored synthesis of MOF@C architectures and related structureperformance modulation remains elusive to date. Herein, we report on the dimensional engineering of MOF@C to prepare ZIF8@single-walled carbon nanotube (SCNT) and ZIF8@reduced graphene oxide (rGO) heterostructures with satisfactory phosphate removal efficiency. The maximum phosphate adsorption capacity of ZIF8@rGO is 491.2 mg g(-1), with the largest partition coefficient value of 1900 mg g(-1) mu M-1 and an initial concentration of 2 mg L-1 under a neutral condition; thus, the prepared heterostructures evidently surpass stateof-the-art adsorbents. The high adsorption capacity is attributable to the two-dimensional graphene support, which provides a more effective surface area for ZIF8 anchoring than that of one-dimensional CNT. Furthermore, phosphate removal on these dimension-engineered MOF@C is examined as a function of pH, system temperature, and coexisting anions. The underlying mechanism is further elucidated via X-ray photoelectron spectroscopy/Xray diffraction analysis and density functional theoretical simulation; enhanced phosphate removal by ZIF8@rGO is mainly attributable to the ligand exchange between the phosphates and the adsorbent. Our findings can aid the design of multifunctional MOF@C adsorbents for efficient phosphate removal from contaminated waterbodies.
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