Abstract
Active carbon/BiOI microspheres were first prepared using a facile one-step solvothermal route from Bi(NO3)3·5H2O, KI, active carbon, and ethylene glycol. The phase structure, morphology, and optical properties of the as-prepared products were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, high resolution transmission electron microscopy, and UV-visible diffuse reflectance spectra. HRTEM mapping results showed that within the composites, active carbon particles dispersed well onto BiOI spheres. The apparent variations in binding energies and photocurrent measurement results verified that the interactions between both components are strong. As a consequence, these active carbon/BiOI composites exhibit an enhanced photocatalytic reduction activity of Cr(vi) under visible light (λ > 420 nm) irradiation when compared with pure BiOI. This work can strengthen the application of BiOI-based micromaterials in treating wastewater contaminated by highly toxic and intractable Cr(vi).
Highlights
Bismuth oxyiodide (BiOI) as an important narrow band gap semiconductor is usually used in visible-light-driven photocatalysis.[1,2] the fast recombination of photogenerated charges in pure BiOI signi cantly reduces its photocatalytic activity.[3]
The mole ratio value of active carbon/(active carbon + BiOI) in the as-prepared active carbon/BiOI heterostructure was determined by infrared carbon sulfur analyzer (LECO CS844) to be 48.7 mol%, which was close to the mole ratio of C/BiOI in the reactants
The apparent variations in binding energies of Bi 4f in XPS results of the samples can be attributed to the strong interactions between two components. This phenomenon can be explained by the fact that the environment of BiOI was altered by active carbon
Summary
Bismuth oxyiodide (BiOI) as an important narrow band gap semiconductor is usually used in visible-light-driven photocatalysis.[1,2] the fast recombination of photogenerated charges in pure BiOI signi cantly reduces its photocatalytic activity.[3]. The carbon/BiOI microspheres has high surface area and strong performance of absorbing Cr(VI).[14] the photocatalytic activities of the as-prepared pure BiOI and active carbon/BiOI microspheres aDepartment of Chemical Engineering, Yangzhou Polytechnic Institute, Yangzhou, 225127, China bTesting Center of Yangzhou University, Yangzhou 225009, China. The BET speci c surface area of pure BiOI and active carbon/ BiOI was 6.92 m2 gÀ1 and 16.95 m2 gÀ1, respectively.
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