Highly Efficient Photocatalytic Degradation of Methyl Orange Utilizing a Sn21Cl16(OH)14O6/SnO2 Photocatalyst

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Abstract
This article used one simple heat treatment to prepare high efficient Sn21Cl16(OH)14O6/SnO2 composite photocatalysts using anhydrous SnCl2 and NaOH powders as raw materials. The structural characteristics of the synthesized catalysts were studied using analysis techniques such as powder XRD, SEM and DRS. The research results showed that Sn21Cl16(OH)14O6/SnO2 composites were prepared by heat treatment. An increase in the content of NaOH in the raw material can promote the transformation of Sn21C-l16(OH)14O6 into SnO2. As the content of NaOH increased, the corresponding content of SnO2 in the product also increased. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images reveal that the sample was composed of aggregates formed by the focusing of a large number of nanocrystals. DRS analysis shows that compared to SnO2 reagent and single-phase Sn21Cl16(OH)14O6, the synthesized sample had much stronger absorption ability in the visible light region, and the bandgap value of the samples were obviously reduced. The photocatalytic experiment proves that the prepared catalysts exhibits excellent photocatalytic degradation ability. Under simulated sunlight and visible light irradiation, samples with lower NaOH content in the raw material can completely degrade methyl orange in 6 minutes and 15 min, respectively. Finally, a reaction mechanism for photocatalytic degradation of methyl orange was proposed.

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