Supporting Information

Controllable synthesis of SrCO3 with different morphologies and their co-catalytic activities for photocatalytic oxidation of hydrocarbon gases over TiO2

Wei Zhang1,2, Ying Yu1*, and Zhiguo Yi2[*]

1Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China

2Key Laboratory of Design and Assembly of Functional Nanostructures & Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002,China

1. Samples preparation by the microemulsion based methods

Two kinds of reverse micelles that named Micromulsion A and Microemulsion B were prepared in this study.

Microemulsion A was prepared by dissolving0.25g CTAB in 20ml cryclohexane and 5ml n-butyl alcohol. The mixing solution was stirring for 30min until it became transparent. Then Sr(NO3)2 (0.25mol/L, 5ml) aqueous solution was added into the above microemulsion solution. The mixing solution was stirring for another 20min.Microemulsion B was prepared by the same method for Microemulsion A, but replacing Sr(NO3)2 aqueous solution by NaHCO3, (NH4)2CO3 and urea solution, respectively.

Then Micromulsion A and Microemulsion B were mixed and stirred for another 10min. After that, the mixing solutionwas transferred into a Teflon-lined steel autoclave. The autoclave was sealed and heated at 373K for 3h and then cooled down to room temperature. The final product was washed with deionized water and pure alcohol several times to remove the residues and then dried at 353K overnight.

Figure S1UV-visible diffusive absorption spectra of SrCO3/TiO2

Figure S1 shows the UV-Visible absorbance spectraof SrCO3/TiO2 nanocomposites.For all the samples, the SrCO3/TiO2nanocomposites show a similarabsorption with that of the TiO2.

Figure S2Photocurrent response of the samples under simulated sunlight illumination

Photoelectrochemical measurements:The photoelectrochemical measurements were tested according to our previous report[1].The photoelectrochemical analysis was carriedout in a conventional three-electrode cell. Ag/AgCl electrode was used as referenceelectrode and Pt electrode acted as the counter electrode. Fluoride-tin oxide (FTO)glass was used to prepare the working electrode. The sample powder (5 mg) wasultrasonicated in 1 mL anhydrous ethanol to obtain evenly dispersed slurry. Then, theslurry was spread onto the FTO glass whose side part was protected in advanceusing Scotch tape.The working electrode was dried overnight under ambientconditions.Uncoated parts of the electrode were isolated with epoxyresin. The exposed area of the working electrode was 0.25 cm2. The irradiation sourcewas a 300 W Xe lamp (CEL-HXF300). The photocurrent measurements wereperformed in a home-made three electrode quartz cell with a CHI660D workstation under simulated sunlight illumination. Theelectrolyte was 0.5 M aqueous Na2SO4 solution (pH=6.8) without additive.

Figure S3rate constant K with error bars

Figure S4The sketch of photoreaction in asealed quartz reactor

Figure S5 The schematic diagram of continues flow photocatalytic test

REFERENCES

[1] Pan X, Chen X, Yi Z (2016) Defective, Porous TiO2 Nanosheets with Pt Decoration as an Efficient Photocatalyst for Ethylene Oxidation Synthesized by a C3N4 Templating Method. ACS Appl Mater Interfaces 8:10104-10108.

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