Construction of a direct Z-scheme CeO2/UiO-66-NH2 heterojunction for boosting photocatalytic organic pollutant degradation and H2 evolution performance. Issue 14 (16th March 2023)

• Record Type: Journal Article
• Authors: Zhang, Heling; Wan, Yuqi; Shang, Simin; Cheng, Qingrong; Pan, Zhiquan
• Is Part Of: Dalton transactions. Volume 52:Issue 14(2023)
• Page Start: 4562
• Page End: 4573
• Publication Date: 2023-03-16
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt03797a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : UiO-66-NH2 grows on the surface of hollow CeO2 nanospheres to form a unique interfacial structure for the efficient photocatalytic degradation of organic pollutants and hydrogen evolution under solar light. Abstract : In this study, hollow CeO2 nanospheres were grown on UIO-66-NH2 nanosheets to form a novel CeO2 /UiO-66-NH2 (abbreviation, CU x ) Z-scheme heterojunction photocatalyst by calcination and hydrothermal method for hydrogen production and photocatalytic degradation of organic pollutants. Under visible light, the H2 generation rate of the CU0.50 composite was 5662.1 μmol g −1 h −1, which was 22 and 7 fold than that of pure CeO2 and pure UiO-66-NH2, respectively. In addition, compared with CeO2 and UiO-66-NH2, the as-prepared CU x composites exhibited enhanced photo-degradation efficiencies for tetracycline (TC) and 2, 4-dichlorophenol (DCP) under simulated solar light irradiation. Among them, the CU0.50 composite demonstrated the highest photocatalytic performance and reached 91.5% for TC, and 94.3% for DCP. In addition, a logical solid-state Z-type electron transfer mechanism is presented with the results of radical scavenging and ESR experiments to illustrate the intensive decomposed ability of the photocatalytic system. The enhanced photocatalytic performance of CU x heterostructures can be attributed to the formation of a band-position-matched hollow structure heterojunction between CeO2 and UIO-66-NH2, which can effectively inhibit the recombination of carriers and increase the specific surface area as well as the light absorption. Moreover, the oxidation and reduction ability of the charge carriers was also increased. This work resulted in a feasible idea for removing organic pollutants and hydrogen production by traditional inorganic semiconductor/MOF-based heterostructured photocatalysts.