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In situ photodeposition of MoS2 on graphitic C3N4 surfaces for enhanced photocatalytic H2 evolution from water.

21Based on a network of field stations belonging to the Chinese Academy of Sciences (CAS), the 22 "Campaign on atmospheric Aerosol REsearch" network of China (CARE-China) was recently 23 established as the country's first monitoring network for the study of the spatiotemporal distribution 24 of aerosol physical characteristics, chemical components and optical properties, as well as aerosol 25 gaseous precursors. The network comprises 36 stations in total and adopts a unified approach in 26 terms of the instrumentation, experimental standards and data specifications. This ongoing project is 27 intended to provide an integrated research platform to monitor online PM 2.5 concentrations, nine-size 28 aerosol concentrations and chemical component distributions, nine-size secondary organic aerosol 29 (SOA) component distributions, gaseous precursor concentrations (including SO 2 , NOx, CO, O 3 and 30VOCs), and aerosol optical properties. The data will be used to identify the sources of regional 31 aerosols, the relative contributions from nature and anthropogenic emissions, the formation of 32 secondary aerosols, and the effects of aerosol component distributions on aerosol optical properties. 33The results will reduce the levels of uncertainty involved in the quantitative assessment of aerosol 34 effects on regional climate and environmental changes, and ultimately provide insight into how to 35 mitigate anthropogenic aerosol emissions in China. The present paper provides a detailed description 36 of the instrumentation, methodologies and experimental procedures used across the network, as well 37 as a case study of observations taken from one station and the distribution of main components of 38 aerosol over China during 2012.39 40

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In our work, ZnO/CdS hybrid photocatalysts were prepared by a simple and reproducible photodeposition method and the content of deposited CdS can be varied by irradiation time. The ZnO/CdS photocatalysts showed good photocatalytic H 2 evolution activities in aqueous Na 2 S + Na 2 SO 3 solution. When the content of CdS loading increased to 22.91% after an irradiation time of 120 min (ZnO/ CdS-T120), the highest photocatalytic activity was obtained (1725 μmol g −1 h −1 ), which was about 9.2 and 34.5 times than that of single ZnO and CdS photocatalysts. At the same time, ZnO/CdS-T120 presented stable photocatalytic ability (no noticeable degradation of H 2 evolution in four repeated runs in 48 h). Compared with other reported H 2 evolution photocatalysts, ZnO/CdS-T120 showed higher H 2 evolution activity and stability. Additionally, ZnO/CdS-T120 has a good natural sunlight driven H 2 evolution ability (2077 μmol g −1 h −1 ). ZnS was proved to generate on ZnO/CdS-T120 surface in process of photocatalytic H 2 evolution based on structural analyses of recycle ZnO/CdS-T120. The formation of ZnS enhanced the photocatalytic H 2 evolution activity of ZnO/CdS and extended the visible light adsorption region. Meanwhile, the generation of ZnS increased the transfer interfaces for photogenerated charge carriers and consequently promoted the separation of photogenerated electrons and holes.