Strategies for improving perovskite photocatalysts reactivity for organic pollutants degradation: A review on recent progress

Wei, Kexin; Faraj, Yousef; Yao, Gang; Xie, Ruzhen; Lai, Bo

doi:10.1016/j.cej.2021.128783

Cited by 146 publications

(45 citation statements)

References 241 publications

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“…Some perovskite oxides were already utilized in the photocatalytic degradation of several dyes by utilizing natural [20][21][22] or simulated sunlight [23] or visible light [24][25][26][27]. In fact, perovskites have the most intriguing physicochemical features that allow researchers a wide range of tunability to obtain high photocatalytic efficiency, stability, and low-rate electron-hole recombination [18,28].…”

Section: Introductionmentioning

confidence: 99%

Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O3 as Heterogeneous Photocatalysts

et al. 2021

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Perovskites of the (La,Ba)(Fe,Ti)O3 family were prepared, characterized, and utilized as heterogeneous photocatalysts, activated by natural sunlight, for environmental remediation of Acid Orange 7 (AO7) aqueous solutions. Catalysts were prepared by the ceramic (CM) and the complex polymerization (CP) methods and characterized by XRD, SEM, EDS, and band gap energy. It was found that catalytic properties depend on the synthesis method and annealing conditions. In the photocatalytic assays with sunlight, different AO7 initial concentrations and perovskite amounts were tested. During photocatalytic assays, AO7 and degradation products concentrations were followed by HPLC. Only photocatalysis with BaFeO3-CM and BaTiO3-CP presented AO7 removals higher than that observed for photolysis. However, photolysis leads to the formation of almost exclusively amino-naphthol and sulfanilic acid, whereas some of the perovskites utilized form less-toxic compounds as degradation products, such as carboxylic acids (CA). Partial substitution of Ba by La in BaTiO3-CM does not produce any change in the photocatalytic properties, but the replacement of Ti by Fe in the La0.1Ba0.9TiO3 leads to reduced AO7 removal rate, but with the formation of CAs. The best AO7 removal (92%) was obtained with BaFeO3-CM (750 mg L−1), after 4 h of photocatalytic degradation with solar radiation.

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Section: Introductionmentioning

confidence: 99%

Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O3 as Heterogeneous Photocatalysts

et al. 2021

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“…In the Gel+GO+VUV system, VUV irradiation ensured an O 2 -saturated solution which generates O 2 •– especially in strong alkaline solutions (eqs and ) . Moreover, the presence of GO acted as a photoreactive semiconductor lead to the formation of oxidative and reductive transients (i.e., h vb + , and e aq – ) under VUV irradiation , so as to initiate the reactions (eqs –) to promote the generation of 1 O 2 and O 2 •– in the Gel+GO+VUV system. The • OH that was generated by VUV irradiation in the Gel+GO+VUV system could rapidly participate in GO reduction, as mentioned previously.…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Mesoporous Sodalite and Graphene Oxide Hybrid Sodalite Using Lithium Silica Fume Waste

Chen

Armutlulu

Jiang

et al. 2021

ACS Sustainable Chem. Eng.

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Mesoporous zeolite and hybrid zeolite are indispensable materials for the chemical industry; however, their fabrication always involved high production cost, long times, and adverse environmental impact. Here, we report a vacuum− ultraviolet (VUV)-initiated reactive oxygen species (ROS) route for the green and fast synthesis of mesoporous sodalite (SOD) zeolite and a hybrid SOD zeolite directly from lithium silica fume (LSF) waste without template. The fast synthesis is based on in situ generation of ROS (e.g., • OH, O 2•− , and 1 O 2 ) in amorphous precursor using VUV irradiation, which significantly shortens the crystallization process to produce SOD with high crystallinity and abundant mesopores at low temperature. Further addition of graphene oxide (GO) during SOD preparation could not only inhibit the zeolite aggregation but also initiate electron transfer to further induce generation of superoxide ion radicals (O 2•− ), and yield a stable hybrid SOD zeolite with narrower band gap within 2 h. The physicochemical properties of the produced SOD and hybrid SOD were carefully studied, whereby electron paramagnetic resonance (EPR) was used to probe the existence of ROS which promote crystallization process. The metal ion adsorptive experiments revealed zeolites produced own superior ion-exchange capacity toward copper ion. This study opens up a new avenue to enable green and ultrafast synthesis of zeolites and hybrid zeolites with improved time efficiency.

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“…Radical yields of the processes were lower compared with other advanced oxidation processes (AOPs). 1 Adding oxidants, such as, ozone (O 3 ), 2 hydrogen peroxide (H 2 O 2 ), 3 peroxymonosulfate (PMS), 4 and peroxydisulfate (PDS), 5 to the photocatalytic processes was reported as effective strategies to enhance their radical yields. The enhanced radical yields were because of the activation of these oxidants by the photogenerated h vb + , e cb − , and/or superoxide radicals (O 2…”

Section: Photocatalytic Processes Generate Hole−electron (H Vbmentioning

confidence: 99%

Near-Ultraviolet Light-Driven Photocatalytic Chlorine Activation Process with Novel Chlorine Activation Mechanisms

2021

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In this study, the near-ultraviolet (near-UV) light-driven TiO2 photocatalytic chlorine activation process, termed as the UV365/TiO2/chlorine process, degrades a representative recalcitrant micropollutant, carbamazepine (CBZ), at an apparent first-order rate constant (k CBZ ′) that is 34.2 and 3.9 times higher than those without TiO2 and chlorine, respectively. In this process, chlorine serves a more important role as a catalyst to enhance the yield of hydroxyl radicals (HO·) without being consumed, in addition to its role as a radical precursor to produce HO· and reactive chlorine species. k CBZ ′ increased with increasing TiO2 dosages from 1.0 to 20.0 mg/L and light intensities from 0.1 to 0.33 mW/cm2 and with decreasing chlorine dosages from 5.0 to 1.0 mgCl2/L. Increasing pH increased the overall radical concentrations but transformed HO· and Cl· to less reactive ClO·, leading to a decreasing k CBZ ′ from pH 6.0 to 9.0. The dual roles of chlorine in the process enabled the rapid CBZ degradation at a chlorine dosage about 1/20 to that of the conventional UVC/chlorine process, at a TiO2 dosage about 1/200 to that of the UVC/TiO2 process and at an electrical energy per order of CBZ degradation at least 2-order of magnitude lower than those of the existing UVC-based processes.

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Strategies for improving perovskite photocatalysts reactivity for organic pollutants degradation: A review on recent progress

Cited by 146 publications

References 241 publications

Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O3 as Heterogeneous Photocatalysts

Sunlight-Driven AO7 Degradation with Perovskites (La,Ba)(Fe,Ti)O3 as Heterogeneous Photocatalysts

Green Synthesis of Mesoporous Sodalite and Graphene Oxide Hybrid Sodalite Using Lithium Silica Fume Waste

Near-Ultraviolet Light-Driven Photocatalytic Chlorine Activation Process with Novel Chlorine Activation Mechanisms

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