| 1 | Cerium and carbon-sulfur codoped mesoporous TiO_(2)nanocomposites for boosting visible light photocatalytic activity显示文摘Ce and C-S codoped mesoporous TiO_(2)nanocomposites were synthesized via a sol-gel method integrated with an evaporation-induced self-assembly approach.The basic physicochemical characteristics of the synthetic samples were analyzed via a series of characterization techniques.The results reveal that C-S and Ce codoping on mesoporous TiO_(2)enhances the photocatalytic activity owing to the synergistic effect caused by narrowing the band gap,enhancing adsorption,trapping and transferring the excited e^(-)/h^(+)pairs and suppressing the recombination of e^(-)/h^(+)pairs.Furthermore,the obtained C,S-TiO_(2)/CeO_(2)materials exhibit large specific surface areas and numerous pores which not only effectively improve the adsorption-enrichment capability,but also supply multi-dimensional mass and electron transfer channels.The photodegradation efficiency of RhB by C,S-TiO_(2)/CeO_(2)within 40 min is nearly 100%,and its degradation efficiency is 6.63 times that of undoped TiO_(2).Recycling experiments show that mesoporous C,S-TiO_(2)/CeO_(2)shows excellent recoverability and stability.Furthermore,by trapping experiments,·O_(2)e^(-)/h^(+)and·OH are the predominant active species and a possible reaction mechanism is proposed. | Fei Zheng Faqin Dong Lin Zhou Jieyu Yu Xijie Luo Xingyu Zhang Zhenzhen Lv Luman Jiang Yuheng Chen Mengqing Liu | 2023 | Journal of Rare Earths2023，41，4： | 1 |
| 2 | Influence of epigallocatechin gallate on the immune function of dendritic cells after ultraviolet B irradiation显示文摘To investigate the protective effect of epigallocatechin gallate(EGCG)on the immune func- tion of dendritic cells(DCs)after ultraviolet B irradiation(UVB)and its underlying mechanisms,the monocytes were isolated from peripheral blood and cultivated into DCs with cytokines,such as GM-CSF and IL-4.DCs were harvested after cultivation for 7 d and subjected to irradiation with different dosages of UVB.Then,200μg/ml of EGCG were added in certain groups immediately after irradiation.DCs simply treated with UVB or treated with both UVB and EGCG were co-cultured with lymphocytes,and MTF assay was used to detect the ability of DCs to stimulate proliferation of lymphocytes.Surface markers CDS0,CD86,HLA-DR and CD40 were detected by flow cytometry,and the levels of IL-10 and IL-12 secreted from DCs 24 h after cultivation were measured by ELISA.It was demonstrated that UVB irradiation could inhibit the ability of DCs to stimulate the proliferation of lymphocytes and surface expressions of CDS0,CD86,HLA-DR and CD4 on DCs in a dose-dependent manner.The inhibition rate of DCs was improved to some extent after treatment with 200μg/ml of EGCG.When the concentra- tion of EGCG exceeded 100μg/ml,the enhancing effect of EGCG on the expression of the co-stimulat- ing molecules on DCs could be demonstrated in a dose-dependent manner.UVB showed no significant influence on the secretion of IL-10 and IL-12 from DCs,while EGCG could down-regulate the secretion level of IL-12 and up-regulate that of IL-10.It is concluded that EGCG can antagonize the inhibitory effect on DCs induced by UVB irradiation.This function has some relationship with its protecting effect of the expression of the co-stimulating molecule on the surface of DCs and the secretion level of IL-10 and IL-12. | DAN LUO, BING RONG ZHOU XIJI | 2007 | Journal of Microbiology and Immunology2007，5，2： | 0 |
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