Structural Regulation And Photocatalysis And Adsorption Properties Of CdS, In 2 O 3 And InOCl Nanomaterials

CdS film assembled by nanoparticles with clean{001} planes exposed, In₂O₃ octahedra and its composite structure, InOCl nanosheets with exposed{001} planes were obtained by rapidly thermal decomposition. The morphology and structure of those nanostructures were characterized by using environmental scanning electron microscopy ?SEM?, field emission scanning electron microscopy ?FESEM?, X-ray diffraction ?XRD?, transmission electron microscopy ?TEM?, adsorption-desorption porosimetry and X-ray photoelectron spectra ?XPS?. The properties of photocatalytic degradation of organic dyes by CdS thin film and In₂O₃ octahedra and the adsorption property of InOCl nanosheets on the dyes were studied. The relationship between their properties and structures was discussed.?1? Through heating Cd?NO₃?2-CS?NH2?2 aqueous mixtures at high temperature, CdS film assembled by nanoparticles with clean{001} planes exposed was synthesized. The film was composed of microspheres and pores with different sizes, and the thickness of film was about 45.33 ?m. It was found that the CdS film showed superior photoreactivity on degradation of methyl orange and Rhodamine B, compared with CdS dendrites and commercial powders. Atomic structure of CdS{001} high active facets was calculated by using periodic density functional theory ?DFT?, in order to investigate the relationship between the crystal structure and properties. A charge separation model between polar{001} facets was proposed to explain the mechanism of enhanced photocatalytic performance of CdS film without capping agents.?2? In₂O₃ octahedra covered with Cl-has been synthesized through the method of heating InCl₃ aqueous solution on 500?, and AgCl loaded In₂O₃ octahedra and In₂O₃ octahedra with exposed clean{111} surfaces were prepared by treating In₂O₃ octahedra covered with Cl- with AgNO₃ solution and ammonia solution, respectively. Their photocatalytic activities on degradation of Rhodamine B under ultraviolet light were studied. It was found that AgCl loaded In₂O₃ octahedra had better photocatalytic activity than In₂O₃ octahedra covered with Cl- and In₂O₃ octahedra with exposed clean{111} surfaces, and with the increase of loaded AgCl, the photocatalysis of In₂O₃ octahedra becomes better. The excellent photocatalytic performance of AgCl loaded In₂O₃ octahedra may be attributed to the heterojunction which could efficiently separate photogenerated electrons and holes.?3? InOCl nanosheets with exposed{001} facets were obtained by heating aqueous solution on 450?, and the thickness and width of nanosheet is about 77 nm and 3.53 ?m, respectively. It was found that InOCl nanosheets showed significantly higher adsorption capacity of azo dyes, for example acid red and methyl orange, than that of triphenylmethane dyes and anthraquinone dyes. By investigating the adsorption mechanism, we found that the excellent adsorption ability of InOCl nanosheets was mainly attributed to electrostatic interaction between the dye molecules with the adsorbent.