期刊
CHEMICAL ENGINEERING JOURNAL
卷 429, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132497
关键词
MIL-101(Fe)-NH2; Cr(VI) reduction; Fixed-bed reactor; Batch test; Continuous operation
资金
- National Natural Science Foundation of China [22176012, 51878023, 21806008]
- Beijing Natural Science Foundation [8202016]
- Great Wall Scholars Training Program Project of Beijing Municipality Universities [CITTCD20180323]
- Beijing Talent Project [2020A27]
- Science and Technology General Project of Beijing Municipal Education Commission [KM202110016010]
- Fundamental Research Funds for Beijing University of Civil Engineering and Architecture [X20147/X20141/X20135/X20146]
The MA photocatalyst prepared via hydrothermal immobilization method can achieve efficient Cr(VI) reduction under white light, showing potential for continuous operation in fixed-bed reactors.
MIL-101(Fe)-NH2 was hydrothermally immobilized on porous alumina substrate to fabricate MIL-101(Fe)-NH2@Al2O3 (MA) photocatalyst via a reactive seeding (RS) method. The as-prepared MA photocatalyst can accomplish 100% Cr(VI) reduction efficiency up to 20 cycles with the synergistic effect of oxalic acid upon the irradiation of white light. The influences of co-existing inorganic ions in simulated tanning wastewater on Cr(VI) reduction were evaluated via a Box-Behnken design of response surface methodology. The as-prepared MA photocatalyst can overcome the difficulty and challenge concerning the recovery and recyclability of traditional powder MOFs photocatalysts. Furthermore, a continuous fixed-bed device based on MA photocatalyst was designed, which can achieve a rapid and efficient Cr(VI) reduction under white light in lab experiment and under the real solar light in field experiment. This work provides the possibility for the continuous photocatalytic Cr(VI) reduction operation in the fixed-bed reactor.
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