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Authors = Chunxi Wan

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11 pages, 3577 KiB  
Article
Synthesis of Novel 1T/2H-MoS2 from MoO3 Nanowires with Enhanced Photocatalytic Performance
by Wan Zhao, Xin Liu, Xiuru Yang, Chunxi Liu, Xiaoxiao Qian, Tao Sun, Wenya Chang, Jingjing Zhang and Zhi Chen
Nanomaterials 2020, 10(6), 1124; https://doi.org/10.3390/nano10061124 - 6 Jun 2020
Cited by 57 | Viewed by 6081
Abstract
Metallic 1T-phase MoS2 is a newly emerging and attractive catalyst since it has more available active sites and high carrier mobility in comparison with its widely used counterpart of semiconducting 2H-MoS2. Herein, 1T/2H-MoS2(N) (N: MoO3 nanowires were [...] Read more.
Metallic 1T-phase MoS2 is a newly emerging and attractive catalyst since it has more available active sites and high carrier mobility in comparison with its widely used counterpart of semiconducting 2H-MoS2. Herein, 1T/2H-MoS2(N) (N: MoO3 nanowires were used to prepare 1T/2H-MoS2) was synthesized by using molybdenum trioxide (MoO3) nanowires as the starting material and applied in the photodegradation of antibiotic residue in water. Enhanced photocatalytic performance was observed on the obtained 1T/2H-MoS2(N), which was 2.8 and 1.3 times higher than those on 1T/2H-MoS2(P) (P: commercial MoO3 powder was used to prepare 1T/2H-MoS2) and 2H-MoS2, respectively. The active component responsible for the photodegradation was detected and a reaction mechanism is proposed. Full article
(This article belongs to the Special Issue Semiconductor Nanomaterials: Growth, Properties and Applications)
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12 pages, 2959 KiB  
Article
Facile Construction of All-Solid-State Z-Scheme g-C3N4/TiO2 Thin Film for the Efficient Visible-Light Degradation of Organic Pollutant
by Wan Zhao, Xiuru Yang, Chunxi Liu, Xiaoxiao Qian, Yanru Wen, Qian Yang, Tao Sun, Wenya Chang, Xin Liu and Zhi Chen
Nanomaterials 2020, 10(4), 600; https://doi.org/10.3390/nano10040600 - 25 Mar 2020
Cited by 53 | Viewed by 3971
Abstract
The increasing discharge of dyes and antibiotic pollutants in water has brought serious environmental problems. However, it is difficult to remove such pollutants effectively by traditional sewage treatment technologies. Semiconductor photocatalysis is a new environment-friendly technique and is widely used in aqueous pollution [...] Read more.
The increasing discharge of dyes and antibiotic pollutants in water has brought serious environmental problems. However, it is difficult to remove such pollutants effectively by traditional sewage treatment technologies. Semiconductor photocatalysis is a new environment-friendly technique and is widely used in aqueous pollution control. TiO2 is one of the most investigated photocatalysts; however, it still faces the main drawbacks of a poor visible-light response and a low charge-separation efficiency. Moreover, powder photocatalyst is difficult to be recovered, which is another obstacle limiting the practical application. In this article, g-C3N4/TiO2 heterojunction is simply immobilized on a glass substrate to form an all-solid-state Z-scheme heterojunction. The obtained thin-film photocatalyst was characterized and applied in the visible-light photodegradation of colored rhodamine B and tetracycline hydrochloride. The photocatalytic performance is related to the deposited layers, and the sample with five layers shows the best photocatalytic efficiency. The thin-film photocatalyst is easy to be recovered with stability. The active component responsible for the photodegradation is identified and a Z-scheme mechanism is proposed. Full article
(This article belongs to the Special Issue Characterization and Preparation of Electrocatalytic Nanomaterials)
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11 pages, 201 KiB  
Article
Biological Activity and Safety of Tripterygium Extract Prepared by Sodium Carbonate Extraction
by Wei Fang, Fan Peng, Tao Yi, Cong Zhang, Chunxi Wan, Huibi Xu, Christopher Waikei Lam and Xiangliang Yang
Molecules 2012, 17(9), 11113-11123; https://doi.org/10.3390/molecules170911113 - 17 Sep 2012
Cited by 12 | Viewed by 7060
Abstract
The commercial preparation named “Tripterygium glycosides” prepared by column chromatography has been used for the treatment of inflammatory and autoimmune diseases with significant efficacy but concurrent toxicity. The aim of this study was to reduce the toxicity of Tripterygium extracts, using cytotoxicity [...] Read more.
The commercial preparation named “Tripterygium glycosides” prepared by column chromatography has been used for the treatment of inflammatory and autoimmune diseases with significant efficacy but concurrent toxicity. The aim of this study was to reduce the toxicity of Tripterygium extracts, using cytotoxicity and anti-inflammatory activity of the three principal active components of Tripterygium wilfordii Hook. F. (TWHF) as guiding parameters. Column chromatography was replaced by sodium carbonate extraction for removing the acidic compounds and enriching epoxyditerpenoids and alkaloids in the extract. Results showed that the therapeutic index (IC50/EC50) on murine macrophage Raw 264.7 cells and rat mesangial HBZY-1 cells of the extract prepared by sodium carbonate extraction was significantly higher than that of Tripterygium glycosides (0.8 and 5.2 vs. 0.3 and 2.6, p < 0.05), while its cytotoxicity on human liver HL7702 cells was significantly lower (14.5 ± 1.4 vs. 6.8 ± 0.9, p < 0.05). Further acute oral toxicity experiments showed that the LD50 value of this extract was 1,210 mg/kg compared to 257 mg/kg for Tripterygium glycosides. All the above results suggest that Tripterygium extract prepared by sodium carbonate extraction may represent a potentially optimal source of medicine with good therapeutic index. Full article
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