We investigated the removal of the organic dye rhodamine B in wastewater with recyclable AgBr/polypyrrole(PPy)nano-photocatalysts.With PPy as an active base for electron transfer,and hexadecyltrimethylammonium bromide...We investigated the removal of the organic dye rhodamine B in wastewater with recyclable AgBr/polypyrrole(PPy)nano-photocatalysts.With PPy as an active base for electron transfer,and hexadecyltrimethylammonium bromide(CTAB)as both the soft-templating agent and the bromine source,a series of AgBr/PPy nano-photocatalysts containing various proportions of silver were prepared in a convenient one-step synthesis procedure.The synthesized catalysts were characterized by TG analysis to reveal that,in comparison with pure PPy,the interaction between PPy and AgBr led to increased thermal stability.Chemical combination of PPy and AgBr was observed through XRD and XPS analyses.For the morphology study,the AgBr particles were found to be well dispersed in the PPy nanowire network from SEM results.In the photodegradation experiments,up to 92%rhodamine B was degraded by the AgBr/PPy catalysts in the period of 1 hour under 254 nm UV light.The catalysts could maintain 60%catalytic efficiency after 3 cycles in the recyclability test.展开更多
Language is an important carrier of culture, and culture finds a better representation through language use. As Sapir-Whorf Hypothesis holds that there is a correlation between language and culture, different nations ...Language is an important carrier of culture, and culture finds a better representation through language use. As Sapir-Whorf Hypothesis holds that there is a correlation between language and culture, different nations have different cultural backgrounds, which means that their ways of showing politeness are not the same. And this kind of difference will definitely be embodied in language. Politeness principles can apply to all languages, but it may have different representations in different cultures. Recognizing these differences may help us improve intercultural communication and behave more polite in intercultural communication.展开更多
Appraisal tells how speakers feel and think about other people or things.The resources of appraisal can function for negotiating social relationship.Therefore,it is available to apply the Appraisal System to analyzing...Appraisal tells how speakers feel and think about other people or things.The resources of appraisal can function for negotiating social relationship.Therefore,it is available to apply the Appraisal System to analyzing the discourses selected from A Passage to India that gains praise for its description about interpersonal relationship.Based on the appraisal expressions in this novel,factors influencing people's connection can be analyzed.Sincerity is an indispensible element of building relationship,but search of inner heart is the key to protecting and maintaining it.展开更多
基金Funded by Guizhou Provincial Natural Science Foundation(No.[2020]1Y030)Young Science and Technology Talents of Education Department of Guizhou Province(No.KY[2016]136)+1 种基金Doctoral Start-up Fund by Guizhou Normal University in 2014,The Guizhou Province Science and Technology Planning Project(No.[2016]1100)National Natural Science Foundation of China(No.21764004)。
文摘We investigated the removal of the organic dye rhodamine B in wastewater with recyclable AgBr/polypyrrole(PPy)nano-photocatalysts.With PPy as an active base for electron transfer,and hexadecyltrimethylammonium bromide(CTAB)as both the soft-templating agent and the bromine source,a series of AgBr/PPy nano-photocatalysts containing various proportions of silver were prepared in a convenient one-step synthesis procedure.The synthesized catalysts were characterized by TG analysis to reveal that,in comparison with pure PPy,the interaction between PPy and AgBr led to increased thermal stability.Chemical combination of PPy and AgBr was observed through XRD and XPS analyses.For the morphology study,the AgBr particles were found to be well dispersed in the PPy nanowire network from SEM results.In the photodegradation experiments,up to 92%rhodamine B was degraded by the AgBr/PPy catalysts in the period of 1 hour under 254 nm UV light.The catalysts could maintain 60%catalytic efficiency after 3 cycles in the recyclability test.
文摘Language is an important carrier of culture, and culture finds a better representation through language use. As Sapir-Whorf Hypothesis holds that there is a correlation between language and culture, different nations have different cultural backgrounds, which means that their ways of showing politeness are not the same. And this kind of difference will definitely be embodied in language. Politeness principles can apply to all languages, but it may have different representations in different cultures. Recognizing these differences may help us improve intercultural communication and behave more polite in intercultural communication.
文摘Appraisal tells how speakers feel and think about other people or things.The resources of appraisal can function for negotiating social relationship.Therefore,it is available to apply the Appraisal System to analyzing the discourses selected from A Passage to India that gains praise for its description about interpersonal relationship.Based on the appraisal expressions in this novel,factors influencing people's connection can be analyzed.Sincerity is an indispensible element of building relationship,but search of inner heart is the key to protecting and maintaining it.
