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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY · 2018 ·Vol. 315 ·期 2 ·119-126 · IF 1.181

Adsorption of uranium (VI) from aqueous solution by tetraphenylimidodiphosphinate

Tan Juan,Wang Yanfei,Liu Na,Liu Mouwu

The adsorption of uranium (VI) using tetraphenylimidodiphosphinate (Htpip) was studied. Factors of affecting sorption efficiency have been investigated and results showed the adsorption of uranium (VI) was equilibrium at pH 4.5, time 20 min, adsorbent dosage 0.005 g and initial concentration 50 mg L −1 reaching 99.86 mg g −1 of adsorption capacity and 99.86% of removal efficiency. Additionally, the interfering ions studies showed that the adsorbent possessed excellent adsorption selectivity of uranium (VI). The surface morphology of Htpip was investigated by SEM. The adsorption process of uranium (VI) onto Htpip fit the pseudo-second-order kinetic model and the Freundlich isotherm model very well.

研究领域: 环境科学 · 化学工程

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RSC Advances · 2020 ·Vol. 10 ·期 59 ·36111-36118 · IF 3.119

HKUST-1 derived Cu@CuOx/carbon catalyst for base-free aerobic oxidative coupling of benzophenone imine: high catalytic efficiency and excellent regeneration performance

Huang Kaimeng,Chen Siyuan,Xia Changjiu,Li Chenhao,Zhu Bin,Gao Hongyi,Peng Xinxin,Lin Min,Luo Yibin,Wang Ge,Shu Xingtian

The oxidative coupling of imines to ketazine with molecular oxygen is a green process towards the synthesis of hydrazine or hydrazine hydrate, which could efficiently address the economic and environmental issues of the traditional Raschig or peroxide-ketazine process. Herein, we developed an efficient heterogeneous base-free benzophenone imine oxidative coupling route with O2 catalyzed by Cu/CuOx/carbon materials derived from MOFs under mild conditions. Under optimized conditions, the conversion of BI is up to 98.2% and the selectivity of ketamine is 94.9%. This catalyst has excellent structure stability, recycling, and regeneration performance, owing to the carbonization of organic ligands of MOF at high temperature. More importantly, it is confirmed that the metallic Cu core is essential to improve the catalytic performance of the CuO shell in the BI oxidative coupling reaction, due to the promotion of electron transfer in the CuO surface, making dissolved O2 molecules more easily insert oxygen vacancies. This strategy might open an avenue to the sustainable catalytic synthesis of hydrazine or hydrazine hydrate.

CAS / MDL: 554-95-0

研究领域: 催化化学 · 材料科学

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Adsorption of uranium (VI) from aqueous solution by tetraphenylimidodiphosphinate

HKUST-1 derived Cu@CuOx/carbon catalyst for base-free aerobic oxidative coupling of benzophenone imine: high catalytic efficiency and excellent regeneration performance