Fabrication of Z-scheme CuPd/SrTiO3–CuPd–Bi2O3 photocatalyst for converting organic dye containing N and S elements into (NH4)2SO4. Issue 4 (August 2021)

• Record Type: Journal Article
• Authors: Piao, Congcong; Lin, Yitong; Liu, Zhiyu; Chen, Liang; Tang, Jianhe; Fang, Dawei; Wang, Jun
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 4(2021)
• Publication Date: 2021-08
• Subjects: Z-scheme photocatalyst -- CuPd alloy co-catalyst -- Solar light photocatalytic degradation -- Selective conversion -- N, S-organic dye; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105537
• Languages: English
• ISSNs: 2213-2929

Abstract

ABSTRACT: Several novel Z-scheme CuPd/SrTiO3 –CuPd–Bi2 O3 photocatalysts are prepared via chemical reduction and calcination methods to degrade organic dyes containing N and S and convert NO2 -, NO3 - and SO3 2- into (NH4 )2 SO4 . Sodium borohydride (NaBH4 ), ascorbic acid (C6 H8 O6 ) and hydrazine hydrate (N2 H4 ·H2 O) are selected as reductants to deposit CuPd alloy nanoparticles on corresponding photocatalyst. The influence of solar light irradiation time on photocatalytic degradation of organic dye and conversion of the generated inorganic ions is studied. The reusability and stability of the prepared photocatalysts are assessed. The results indicate that the Z-scheme CuPd/SrTiO3 –CuPd–Bi2 O3 photocatalyst prepared by using NaBH4 has best photocatalytic activity, reusability and stability. The capture experiment of active species proves that holes play crucial roles in photocatalytic degradation of organic dyes and conversion of SO3 2- and electrons are momentous for the conversions of NO2 - and NO3 - . A possible mechanism on photocatalytic degradation of organic dyes containing N and S and conversions of NO2 -, NO3 - and SO3 2- into (NH4 )2 SO4 caused by Z-scheme CuPd/SrTiO3 –CuPd–Bi2 O3 photocatalyst is proposed. Graphical Abstract: ga1 Highlights: Several novel photocatalysts are prepared via chemical reduction and calcination. CuPd alloy cocatalyst is introduced to Z-scheme SrTiO3 /Bi2 O3 photocatalytic system. Effect of CuPd alloy gained via three reductants on catalyst activity is clarified. Formation of alloy can boost synergistic effect of Cu and Pd in reduction reaction. The catalyst can selectively convert organic dye containing N and S into (NH4 )2 SO4 .