Reusable Heterogeneous SnO2/ZnO Catalyst for Biodiesel Production from Acidified/Acid Oils

Dall'Oglio, Daiane F.; Garcia, Marco Aurélio Suller; Fiorio, Jhonatan Luiz; Abreu, Wiury Chaves de; Pereira, Luciana Patrícia Lima Alves; Braga, Adriano H.; Moura, Edmílson Miranda de; Guldhe, Abhishek; Bux, Faizal; Moura, Carla Verônica Rodarte de

doi:10.21577/0103-5053.20200167

Cited by 9 publications

(5 citation statements)

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“…By increasing SnO 2 content, the intensity of its corresponding peaks increased, more clearly for composites ZT20 and ZT30 compared to ZT10; however, the ZT10 diffractogram revealed no apparent change compared to ZnO pattern due to either the composite's lower SnO 2 content or the very low crystallinity of SnO 2 [26]. These findings are consistent with other published reports [35,36]. In addition, it is evinced that overlapping of peaks from both oxides leads to peak broadening.…”

Section: Xrd Analysissupporting

confidence: 89%

Green Synthesis of ZnO/SnO2 Hybrid Nanocomposite for Degradation of Cationic and Anionic Dyes under Sunlight Radiation

Abduh,

Al-Odayni

2023

Materials

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The aim of this work was to biosynthesize SnO2-decorated ZnO (ZT) nanocomposites (NCs) of different Sn content (10, 20, and 30 mol%), namely, ZT10, ZT20, and ZT30, using Olea europaea leaf aqueous extract-based phytocompounds as nanoparticle facilitating agents for application as effective photocatalyst in the removal of dyes from polluted water. The obtained ZT NCs were characterized using various techniques, including FTIR, XRD, TGA, TEM, EDS, UV–Vis, PL, and BET surface area. X-ray diffraction patterns show that rutile SnO2 and hexagonal ZnO coexist in the composites, and their crystallite size (D) is affected by the SnO2 ratio; the obtained D-values were 17.24, 19.07, 13.99, 6.45, and 12.30 nm for ZnO, SnO2, ZT10, ZT20, and ZT30, respectively. The direct band gaps of the ZT heterostructure increase with increasing SnO2 ratio (band gap = 3.10, 3.45, 3.14, 3.17, and 3.21 eV, respectively). TEM spectroscopy revealed nanorod and spherical grain morphologies of the composites, while EDS confirmed the elemental composition, the element ratio, and the composite’s purity. All catalysts exhibit type III isotherm with macropore structure. The photocatalytic efficiency against cationic (methylene blue (MB), rhodamine B (RB)), and anionic (methyl orange (MO)) dyes, under sunlight, was optimal with ZT20. The results revealed almost complete degradation at 55, 65, and 55 min, respectively. Hence, it is evident that incorporating SnO2 improves the photocatalyst’s performance, with an apparent optimal enhancement at 20 mol% Sn decorating ZT NCs. More interestingly, the catalyst stability and activity remained unaffected even after four activating cycles.

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Section: Xrd Analysissupporting

confidence: 89%

Green Synthesis of ZnO/SnO2 Hybrid Nanocomposite for Degradation of Cationic and Anionic Dyes under Sunlight Radiation

Abduh,

Al-Odayni

2023

Materials

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“…of 1021.4 and 1044 eV, ascribed for Zn 2p 3/2 and Zn 2p 1/2 of Zn 2+ , respectively (Fig. 6 B) [ 39 ]. For the same sample, we display the C 1s spectrum (Fig.…”

Section: Resultsmentioning

confidence: 99%

Zn‐doped MnOx nanowires displaying plentiful crystalline defects and tunable small cross-sections for an optimized volcano-type performance towards supercapacitors

Ribeiro,

de Lima,

Santos

et al. 2023

Discover Nano

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MnOx-based nanomaterials are promising large-scale electrochemical energy storage devices due to their high specific capacity, low toxicity, and low cost. However, their slow diffusion kinetics is still challenging, restricting practical applications. Here, a one-pot and straightforward method was reported to produce Zn-doped MnOx nanowires with abundant defects and tunable small cross-sections, exhibiting an outstanding specific capacitance. More specifically, based on a facile hydrothermal strategy, zinc sites could be uniformly dispersed in the α-MnOx nanowires structure as a function of composition (0.3, 2.1, 4.3, and 7.6 wt.% Zn). Such a process avoided the formation of different crystalline phases during the synthesis. The reproducible method afforded uniform nanowires, in which the size of cross-sections decreased with the increase of Zn composition. Surprisingly, we found a volcano-type relationship between the storage performance and the Zn loading. In this case, we demonstrated that the highest performance material could be achieved by incorporating 2.1 wt.% Zn, exhibiting a remarkable specific capacitance of 1082.2 F.g−1 at a charge/discharge current density of 1.0 A g−1 in a 2.0 mol L−1 KOH electrolyte. The optimized material also afforded improved results for hybrid supercapacitors. Thus, the results presented herein shed new insights into preparing defective and controlled nanomaterials by a simple one-step method for energy storage applications.

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“…These catalysts are easily separable from the reacting system and reducing purification cost and process time. Recently in 2021, metal oxide based nanocatalysts such as Cu–Ni doped ZrO 2 , Cellulose/α‐Fe 2 O 3 –ZrO 2 , Eggshell‐derived CaO, CaO/CeO 2 , Na‐SiO 2 /CeO 2 , WO 3 ‐Zr 2 O 3 /CaO, ZnO, SnO 2 /ZnO, Fe/CuO, and Fe 3 O 4 have been successfully utilized in the conversions of renewable triglyceride resources into biodiesel 137–145. Tab.…”

Section: Current Studies and Future Aspectsmentioning

confidence: 99%

Advances in Metal Oxide‐based Nanocatalysts for Biodiesel Production: A Review

et al. 2023

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The demand for renewable fuels has risen as a result of increasing human population, urbanization, industrialization, and transport systems. Biodiesel production using metal oxide-based heterogeneous catalysts is an efficient, sustainable, and environmentally friendly approach. Because of their recovery, reusability, and consistency, heterogeneous catalysts may be preferable to homogeneous catalysts. Since the last few decades, the metal oxides of alkali earth and transition metals and their composite materials have been used as nanocatalysts in the production of biodiesel fuel. Utilization of inorganic metal oxide nanoparticles (MONPs) and their composite materials in producing biodiesel has gained increased attention because of their advanced physical and chemical characteristics. In this review, the applicability of metal oxides and their nanocomposite-based catalysts in biodiesel production, transesterification reactions with nanocatalytic systems, and the important parameters that affect these reactions are discussed.

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Reusable Heterogeneous SnO2/ZnO Catalyst for Biodiesel Production from Acidified/Acid Oils

Cited by 9 publications

References 0 publications

Green Synthesis of ZnO/SnO2 Hybrid Nanocomposite for Degradation of Cationic and Anionic Dyes under Sunlight Radiation

Green Synthesis of ZnO/SnO2 Hybrid Nanocomposite for Degradation of Cationic and Anionic Dyes under Sunlight Radiation

Zn‐doped MnOx nanowires displaying plentiful crystalline defects and tunable small cross-sections for an optimized volcano-type performance towards supercapacitors

Advances in Metal Oxide‐based Nanocatalysts for Biodiesel Production: A Review

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