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In-situ tracking CO_(2)-assisted isothermal-isobaric synthesis of selfassembled Bi-based photocatalyst using novel SAXS/XRD/XAFS combined technique
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作者 Yunpeng liu Shunzheng Zhao +7 位作者 Jiajun Zhong jianglong liu Baotong Chen You Liao Lei Yao Zhongjun Chen Buxing Han Zhonghua Wu 《Science China Materials》 SCIE EI CAS CSCD 2024年第11期3609-3621,共13页
The synthetic path of a catalyst determines its morphology,species,and performance,and in-situ monitoring the catalyst formation process is fascinating and challenging.Herein,a newly developed synchrotron radiation sm... The synthetic path of a catalyst determines its morphology,species,and performance,and in-situ monitoring the catalyst formation process is fascinating and challenging.Herein,a newly developed synchrotron radiation smallangle X-ray scattering/X-ray diffraction/X-ray absorption fine structure(SAXS/XRD/XAFS)combined technique was used to in-situ monitor the isothermal-isobaric synthesis process of CO_(2)-assisted(BiO)_(2)CO_(3)(BOC)photocatalyst,and the atomic near-neighbor structure,crystalline structure and nanoscale particle size evolution with reaction time were simultaneously captured.The results show that both polyvinyl pyrrolidone and CO_(2)formed uniformly-distributed nano-sized scatterers in the Bi-based precursor solution,presenting short-range ordered structures to a certain extent.The as-prepared BOC catalytic particles underwent the evolution process of initial Bi(OH)3 precipitate,early-stage formed KBiO_(2)molecules,intermediate amorphous(BiO)4CO3(OH)2 nanoparticles,and finally crystallized flower-like BOC particles self-assembled by nanosheets.The flower-like BOC particles,Bi/BOC composite,and Bi nanospheres were further prepared with different synthesis paths.Flower-like BOC particles showed the best photocatalytic degradation performance of RhB.Scavenger experiment and theoretical calculation revealed the photocatalytic mechanisms of BOC.This work has implications for path-dependent synthesis of other catalysts. 展开更多
关键词 SAXS/XRD/XAFS combined technique (BiO)_(2)CO_(3) in-situ tracking formation process photodegradation
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Will Tax Burden Be a Stumbling Block to Carbon-Emission Reduction? Evidence from OECD Countries 被引量:1
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作者 Yishuai REN Yong JIANG +2 位作者 Chaoqun MA jianglong liu Jing CHEN 《Journal of Systems Science and Information》 CSCD 2021年第4期335-355,共21页
The influence of taxation on the economy and society is everywhere. Given the fact that CO_(2) emission is closely connected with human activities, the question naturally arises whether the tax burden affects the carb... The influence of taxation on the economy and society is everywhere. Given the fact that CO_(2) emission is closely connected with human activities, the question naturally arises whether the tax burden affects the carbon emissions. To address this issue, based on the data of 21 OECD countries over the period from 1991–2014, we use the ratio of tax revenue to GDP as a proxy of the tax burden and employ a panel quantile model with the non-additive fixed effects for analysis. The results suggest that the impact of the tax burden on carbon emissions is heterogeneous across countries based on the level of carbon emissions. Moreover, we find a stable U-shaped relationship between the tax burden and carbon emissions whether for countries with a high or low level of carbon emissions. Our findings suggest that moderate taxes could help reduce carbon emissions, but the effect of excessive taxation is the opposite. 展开更多
关键词 tax burden carbon emissions panel quantiles OECD countries
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