Enhanced Photodegradation and Hydrogen Production Using CuInS₂.pptx

Enhancing the photodegradation and hydrogen production of CIS .

1. CuInS₂/ Mg(OH) 2 Nanosheets for the Enhanced Visible-light Photocatalytic Degradation of Tetrac`ycline. Xiaogang Zheng ,Yiting Mao , Jing Wen , Xiaojin Fu 1 and Xinhui Liu Nanomaterials 2019, 9, 1567; doi:10.3390/nano9111567

2. Disposal of waste

3. what is Tetracycline or TCL ? TCL as a broad spectrum of antibiotic, has been intensively applied for the therapy of human and livestock infections. Its residue has become one of the largest source of producers of non-biodegradable pollution damaging the human health and the ecosystems.

4. what is CuInS 2 ? copper indium sulfide is considered as potential visible-light photocatalyst owning to its narrow band gap (1.5 eV), large optical absorption coefficient (alpha > 10 ^5/cm) and efficient solar energy conversion. The hexagonal wurtzite structure is designed to enhance light-absorbing and to increase charge transfer due to its anisotropic crystal structure. The abundant surface defects serve as the non-radiative recombination sites of charge carriers, accelerating the photocatalytic reaction on the surface.

5. Problem ? However, CIS suffers from the poor durability because of the photo-corrosion and surface oxidation under the long term irradiation. In fact, the acute photo-corrosion is ascribed to the excess holes assembled in the valence band band of the CIS.

6. what is heterojunction ? combined with atleast two materials as well as has been to accelerate the hole transfer and enhance the stability.

7. what is Mg (OH) 2 ? as a typical two-dimensional material with a type-II band structure, has been widely applied in photovoltaic devices and solid-state electronics owing to its rapid electron transport, low exciton recombination rate and efficient photon-harvesting capacity .

8. Therefore, in this work, docacted nanosheets coupled were developed for the visible light activated photocatalytic degradation of TCL. This heterojunction can modulate the interactions between Mg(OH) 2 and the nanoparticles CIS for enhanced photocatalytic capacity of the original nanosheets only.

9. Methods Preparation of the Catalysts The nanosheets Mg(OH) 2 were prepared via hydrothermal approach. The CuInS₂/ Mg(OH) 2 composits were also prepared by a hydrothermal route.

10. Methods Characterization of Catalysts XRD FE-SEM TEM AFM NOVA ICP-OES UV-Vis DRS PL ESR

11. Methods Photocatalytic Activity photocatalytic degradation of TCH using Xe lamp of 300W with a wavelength of 420nm as the light source. Dispersed in 100 mL of TCH and then stirred for 2H analyzed using Agilent 1100 Venusil HILIC column and UV detector.

12. CIS/Mg(OH) 2 nanosheets exhibit the better photocatalytic activity in comparison to Mg(OH)2 for the visible light driven degradation of TCH. The combined effect between CuInS 2 and Mg(OH) 2 is likely to enhance the photocatalytic activity. The surface roughness of 2-CIS/Mg(OH) 2 is changed in adsorption-photocatalytic system. ESR results indicate that •O2 − radical as well as •OH is the main radical for the enhanced photocatalytic activity of 2-CIS/Mg(OH) 2 . Among these obtained composites, 2-CIS/Mg(OH) 2 with the nominal CuInS 2 content 5.0 wt. % presents the best photocatalytic activity and stability after five cycle times under the same conditions. Conclusion