ABSTRACT
Molybdenum disulfide (MoS2) was synthesized via hydrothermal process under the assistance of citric acid, which exhibited high photocatalytic property in the application of methylene blue (MB) degradation. The flower ball microstructure of MoS2 changed with different amounts of citric acid. X-ray diffraction (XRD), Scanning electron microscope (SEM), UV-Vis diffuse reflectance spectra have been employed to characterize the samples. It improved the photocatalytic efficiency nearly 19.77% compared to MoS2 without citric acid. When H2O2 was added, the synergistic effect of MoS2 and hydrogen peroxide (H2O2) was observed in photocatalytic reaction system, which degraded MB completely within 40 min under visible light irradiation.
ABSTRACT
The g-C3N4/BiPO4 composites have been successfully synthesized via a one-pot hydrothermal process, which can be used to degrade the organic dyes (rhodamine B and methylene blue) under simulated sunlight irradiation. X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis diffuse reflectance spectra and Fourier transform infrared (FTIR) spectroscopy have been employed to characterize the samples. The g-C3N4/BiPO4 composites exhibited higher photocatalytic activity than pure BiPO4. And the optimum photocatalyst shows the outstanding photocatalytic activity, which exhibited 99.0% and 86.6% decolorization rate of RhB and MB, respectively.
ABSTRACT
Objective To understand infection status of human immunodeficiency virus (HIV) and analyze the influencing factors among men who have sex with men (MSM) in Guangzhou. Methods Men who have sex with men (MSM) were recruited from 2014 to 2017. Face-to-face questionnaire survey was conducted to collect information of characterisitc and behaviors. Blood samples were used to detect HIV antibodie. Data were analyzed using SPSS 19.0. Results Among 2 419 MSM, 200(8.27%) participants were confirmed positive for HIV. Multivariate Logistic regression analysis showed that with Guangzhou and monthly economic income >0.5 million as reference, non-Guangzhou (OR=1.712, 95% CI: 1.176-2.492，P=0.005) and monthly economic income ≤0.5 million (OR=1.998, 95% CI: 1.409-2.833，P<0.001) were associated with HIV infection among MSM. Diagnosed syphilis (OR=2.461, 95% CI: 1.375-4.405,P=0.002) , undetected syphilis (OR=2.333, 95% CI: 1.635-3.331,P<0.001), anal sex role passive (OR=2.015, 95% CI: 1.244-3.267,P=0.004), both active and passive (OR=2.115, 95% CI: 1.374-3.251,P=0.001), non-using condoms every time during anal sex (OR=1.955, 95% CI: 1.374-2.781,P<0.001), non-fixed anal sex objects (OR=2.150, 95% CI: 1.463-3.160,P<0.001) were major risk factors for HIV infection among MSM. Conclusions The prevalance of HIV infection and high-risk sexual behavior were high among MSM in Guangzhou. It is urgent to expand the scope of HIV testing and advocate safe sexual behaviors among MSM.
