CuAl Hydrotalcite Formed CuAl‐Mixed Metal Oxides for Photocatalytic Removal of Rhodamine B and Cr(VI). Issue 44 (29th November 2018)

• Record Type: Journal Article
• Authors: Mao, Na; Jiao, Yi
• Is Part Of: ChemistrySelect. Volume 3:Issue 44(2018)
• Page Start: 12676
• Page End: 12681
• Publication Date: 2018-11-29
• Subjects: CuAl hydrotalcite -- CuAl MMO -- Photocatalysis -- Rhodamine B -- Cr(VI) solution; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201801888
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Mixed metal oxides (MMOs) are important semiconductor photocatalysts for water treatment, such as removal of organic dyes and metal ions. In this paper, CuAl hydrotalcite‐like compounds (CuAl‐HTLcs) were synthesized by the coprecipitation method using Al(NO3 )3 ⋅9H2 O and Cu (NO3 )2 ⋅3H2 O as raw materials. Cu2 O/Cu2 Al2 O4 mixed metal oxides (MMO) were prepared by calcining CuAl‐HTLcs at 900 °C. The obtained composites were characterized by various methods, including X‐ray diffraction (XRD), Scanning electron microscopy (SEM), and UV‐Vis diffuse reflectance spectroscopy (DRS), among others. Their photocatalytic activities towards removal of Rhodamine B (RhB) and Cr(VI) were evaluated by spectrophotometry, XRD revealed that CuAl‐MMO composites were composed of high crystallinity Cu2 O and Cu2 Al2 O4 grains. DRS showed the strong ultraviolet absorption ability of the composites. The electrochemical testing demonstrated CuAl‐MMO composites with good photocatalytic activities towards the removal of Rhodamine B (RhB) and Cr(VI) under ultraviolet light, with reaction rate constants determined as 0.41 h −1 and 0.49 h −1, respectively. The relevant photocatalytic activities of CuAl‐MMO composites were attributed to the synergy between the two components. Overall, these data look promising for future use of CuAl‐MMO as an important photocatalyst for water remediation. Abstract : Compared to CuAl‐HTLcs, the CuAl‐MMO composite photocatalyst showed significant removal of RhB and Cr (VI) under light. The relevant photocatalytic activities of CuAl‐MMO composites were attributed to the synergy between the two components. Overall, these data look promising for future use of CuAl‐MMO as an important photocatalyst for water remediation. The increase in photocatalytic performance was due to synergy between Cu2 O and Cu2 Al2 O4 which affected the transfer and recombination of photogenerated charge and holes. These results provided new type of photocatalyst and novel synthesis method for photocatalytic hydrogen production.