Synthesis, characterization and synergistic photocatalytic properties of yeast-assisted composite La_0.7Sr_0.3MnO₃/TiO₂

Abstract

A magnetic yeast-assisted composite Y-La0.7Sr0.3MnO3/TiO2with p–n heterojunction was prepared. And it shows an obvious synergistic photocatalytic effect on methyl orange (MO) wastewater under solar irradiation.

Synthesis, characterization and catalytic performance of magnetic La0.7Sr0.3MnO3/α-Fe2O3 with p–n heterojunction structure

“…It can be seen from Table 2 and Fig. 7a [7], demonstrating that it can be separated more easily by external magnetic field.…”

“…In this research, potassium iodide (KI, 1.0 mmol L -1 ), isopropanol (IPA, 1.0 mmol L -1 ), p-benzoquinone (BQ, 1.0 mmol L -1 ) were used as traps for holes (h ? ), hydroxyl radicals ( Á OH) and superoxide radical ( Á O 2 -), respectively [7]. In addition, the generated Á OH during the Fenton-like-dark degradation process was detected by measurement of the photoluminescence (PL) signal of 7-hydroxycoumarin resulting from the combination of Á OH and coumarin (excitation wavelength of 346 nm) [24].…”

“…For example, the pn heterojunction structure of FeWO 4 /BiPO 4 showed stronger photocatalytic capability than BiPO 4 for Rhodamine B and tetracycline dye degradation under visible light irradiation [6]. Compared with La 0.7 Sr 0.3 MnO 3 and TiO 2 , the p-n heterojunction La 0.7 Sr 0.3 MnO 3 /TiO 2 exhibited better photocatalytic effect on the degradation of methyl orange (MO) wastewater under sunlight [7]. Therefore, various types of p-n-type heterojunction materials have been prepared by selective recombination of p-type and ntype semiconductors such as MnO 2 /La 0.7 Sr 0.3 MnO 3 [8] [10], La 0.7 Sr 0.3 MnO 3 /SrIrO 3 [11], La 0.7 Sr 0.3 MnO 3 /GeO 2 [12] and La 0.7 Sr 0.3 MnO 3 /ZnO [13].…”

“…The A site ion of ABO 3 oxides is doped becomes p-type semiconductors, which can be combined with n-type J Mater Sci (2021) 56:7862-7878 semiconductor to form p-n heterojunction photocatalysts. For example, p-type La 0.7 Sr 0.3 MnO 3 /n-type TiO 2 [7], p-type LaFeO 3 /n-type Fe 2 O 3 [14], p-type Ag 3 PO 4 /n-type NaTaO 3 [15] and n-type a-Fe 2 O 3 /ptype CaFe 2 O 4 [16] have higher photocatalytic activity. The improved photocatalytic activity is ascribed to the p-n junction formed by p-type and n-type semiconductors, which promote the separation of photogenerated holes and electrons.…”

Pigment Production Improvement in Rhodotorula mucilaginosa AJB01 Using Design of Experiments

“…However, various microbiological processes have been commercially exploited for the production of these compounds [ 4 ]. Industrial carotenoid pigments such as β-carotene and astaxanthin are used as natural food coloring agents or as aquaculture feed additives [ 5 ]. Owing to the fact that most of the current chemically produced carotenoids can cause side effects in atopic patients, including clinical symptoms such as dermatitis, rhinitis, asthma, hives, and angioneurotic edema, researchers are exploring other ways to obtain these molecules from natural products, such as plants and those obtained from microbial sources [ 6 ].…”