Hydrothermal oxygen uncoupling of high-concentration biogas slurry over Cu-α-Fe2O3·α-MoO3 catalyst. (15th October 2022)

• Record Type: Journal Article
• Authors: Wang, Jian; Tao, Junyu; Dong, Xiaoshan; Liu, Zibiao; Hou, Donghao; Hu, Yongjie; Yan, Beibei; Su, Hong; Chen, Guanyi
• Is Part Of: Journal of environmental management. Volume 320(2022)
• Publication Date: 2022-10-15
• Subjects: Biogas slurry -- Aqueous phase reforming -- Hydrothermal oxygen uncoupling -- Wastewater treatment; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2022.115827
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: A hydrothermal oxygen uncoupling (HTOU) method which combines aqueous phase reforming (APR) and oxygen uncoupling was proposed to treat biogas slurry (BS). Based on Le Chatelier's principle, this novel approach was constructed and realized by Cu–α-Fe2 O3 ·α-MoO3 catalyst with van der Waals heterojunction-redox property. Additionally, the catalyst was synthesized by integrating a simple one-pot sol-gel method and thermal hydrogenating. Results indicated that the optimal removal efficiencies of non-purgeable organic carbon (NPOC) (76.29%), total nitrogen (TN) (45.56%), and ammonia nitrogen (AN) (29.03%) were achieved on the Cu–α-Fe2 O3 ·α-MoO3 catalyst at 225.00 °C for 30.00 min, respectively. The significant performance of Cu–α-Fe2 O3 ·α-MoO3 could be attributed to three aspects. (1) The α-MoO3 nanosheets with van der Waals heterostructures obtained at the calcination temperature of 600.00 °C, which can provide the superior performance of APR for hydrogen generation. (2) The adsorbed oxygen species were eliminated by thermal hydrogenating which had a surface passivation effect. (3) The effect of oxygen uncoupling in the lattice oxygen and gaseous oxygen release reaction was beneficial to the degradation of organic matter. Moreover, the reuse of catalysts studies further revealed that the deactivation of catalysts originated from carbon deposition of aromatic polymers and heavy metals oxides pollution. Overall, these findings disclosed that the HTOU could be a promising alternative to the treatment of high-concentration organic wastewater. Graphical abstract: Image 1 Highlights: Cu–α-Fe2 O3 ·α-MoO3 catalyst was designed to achieve HTOU of BS. Oxygen uncoupling promoted the decomposition of organic matters in BS. Removal of NPOC (76.29%), COD (79.56%), TN (45.56%), and AN (29.03%) was achieved. Catalyst deactivation was caused by carbon deposition and heavy metals pollution. HTOU is promisingly potential to treat organic wastewaters including BS.