RSC Advances
·
2019
·Vol. 9
·期 6
·3063-3071
·
IF 3.049
Jingxuan Long,Wenfeng Zhao,Yufei Xu,Weibo Wu,Chengjiang Fang,Hu Li,Song Yang
Selective hydrogenation of unsaturated compounds is mainly carried out by using high-pressure hydrogen in the presence of a precious or transition metal catalyst. Here, we describe a benign approach to efficiently catalyze the hydrogenation of furfural (FUR) to furfuryl alcohol (FFA) over commercially available cesium carbonate using nontoxic and cheap polymethylhydrosiloxane (PMHS) as hydrogen source. Good to excellent FFA yields (≥90%) could be obtained at 25–80 °C by appropriate control of the catalyst dosage, reaction time, and the hydride amount. FUR-to-FFA hydrogenation was clarified to follow a pseudo-first order kinetics with low apparent activation energy of 20.6 kJ mol−1. Mechanistic insights manifested that PMHS was redistributed to H3SiMe, which acted as the active silane for the hydrogenation reactions. Importantly, this catalytic system was able to selectively reduce a wide range of aromatic aldehydes to the corresponding alcohols in good yields of 81–99% at 25–80 °C in 2–6 h.
研究领域:
化学工程
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2020
·Vol. 20
·期 2
·1008-1012
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IF 1.134
Zhao Xiao-Chong,Wu Dong-Xue,Yang Li-Jun,Tang Jun,Yue Guo-Zong,Yang Pan
Institute of Materials, Chinese Academy of Engineering Physics, Jiangyou 621908, P. R. China To improve the stability of organic–inorganic hybrid perovskite, cesium-containing methylammonium lead iodide perovskite have been synthesized by one-step solution deposition. With the
increasing of Cs+ doping concentration, direct optical band gap of perovskite was increases, while defects and roughness of perovskite thin films were gradually augmented. A certain amount of Cs+ incorporated in perovskite absorb layer could improve power conversion efficiency
through the enhancing of open circuit voltage and fill factor. However, excessive Cs+ doping concentration results in the reduced of short-circuit current and fill factor, which reduced power conversion efficiency. The optimized ratio 10% Cs+ doping achieved the highest
power conversion efficiency (16.84%).
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Tian Duan,Wang Zhe,Zhang Jiaqian,Luo Ying,Zhang Zhenlong,Li Chao,Ye Kai,Peng Chaoliang,Chen Yiming,Lin Wenxue,Zhang Jingyan
This study examines attapulgite-bentonite-pyrite (AB 7 Fe) and zeolite-bentonite-pyrite (ZB 7 Fe) mixtures as buffer and backfill materials for nuclide migration using soil column experiments and COMSOL modeling. The results indicated that ZB 7 Fe possessed higher adsorption capacities for cesium (Cs) and strontium (Sr) compared to AB 7 Fe. Conversely, AB 7 Fe demonstrated superior retardation performance, more effectively slowing nuclide migration. After 1000 years, Cs and Sr concentrations in AB 7 Fe surpassed those in ZB 7 Fe. Additionally, nuclide migration increased with higher initiation pressure, dispersion, and diffusion coefficients. This research is crucial for improving the long-term safety of nuclear waste repositories.
研究领域:
环境科学
·
核废物管理
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jinshui Duan,Ruijun Jia,Kangning Liu,Mingyang Yu,Quanjiang Lv,Shahid Hussain,Sameh M. Osman,Jun Dai,JunLin Liu,Chunxia Wu
Perovskite quantum dots (QDs) have garnered significant interest for their superior optical properties . Despite their attractive photovoltaic properties and chemical processing ability, the high defects density within QDs can result in the annihilation of luminescence. In this study, cesium trifluoroacetic acid (CsTFA) was used as the cesium source, replacing conventional cesium carbonate (Cs 2 CO 3 ) and introducing TFA ligands to improve the luminescence quality of QDs . As well as doping with Zn 2+ to enhance both the stability and luminescence quality of the quantum dot solution. The doped QDs exhibit the highest photoluminescence (PL) intensity, which is further enhanced by the perovskite QDs with TFA as a ligand. Furthermore, the PL spectra of CsPbBr 3 and TFA-CsPbBr 3 : Zn (10 %) QDs with the temperature changes have also been analyzed. The result reveals the relationship between excitons and phonons . Based on the result, Zn 2+ doped and TFA ligand induced perovskite QDs have the potential to serve as an optimal material.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Hao Fang,Lu Yang,Jie Ni,Shanshan Feng,Wenhao Jia,Na Li,Xiaoyi Ma,Zhengwei Zhou,Yao Zhang,Sheng Feng
This study developed an innovative adsorbent—cobalt ferrocyanide/ZIF-67/aged garbage humus soil aerogel (PBA/ZIF-67/AARH aerogel)—specifically designed for the effective removal of cesium ions (Cs) from radioactive wastewater. The aerogel exhibited a maximum adsorption capacity of up to 51.92 mg/g, maintaining excellent Cs adsorption performance even in complex aquatic environments that contain other ions and dissolved organic matter (DOM). The experimental results showed that the adsorption effect of PBA/ZIF-67/AARH aerogel was the best when the dosage of PBA/ZIF-67/AARH aerogel was 0.01 g and pH value was 5. The adsorption capacity was 29.75 ± 0.5 mg/g. At the same time, PBA/ZIF-67/AARH aerogel has good regeneration stability. After five sorption-desorption cycles, the adsorption capacity is 20.1 ± 0.3 mg/g, and the Cs removal rate remains at 84.5 ± 0.5%. The PBA/ZIF-67/AARH aerogel also has a large specific surface area, reaching 30.7950 m 2 /g. Experimental analyses indicated that the Cs removal process aligns with both the Langmuir adsorption model and pseudo-second-order kinetics, revealing key mechanisms for adsorption efficiency, including ion exchange, functional group complexation, and the synergistic effects of cross-linking. This research provides a novel solution for the efficient removal of Cs, establishing a solid theoretical and practical foundation for future applications in pollution water treatment technologies. It holds significant potential for environmental protection and profound implications for human health.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Ji Lei,Lo-Yueh Chang,Zhaohui Dong,Lijia Liu
Caesium lead bromide perovskite nanocrystals (PNCs) are synthesized using a room-temperature sonochemical method. By mixing equimolar of CsBr and PbBr 2 in Dimethylformamide (DMF), PNCs of CsPbBr 3 structure are formed. Under an identical reaction condition, when EuBr 2 is introduced with the CsBr/PbBr 2 precursor, the resulted product (Eu-PNCs) becomes zero-dimensional Cs 4 PbBr 6 nanocrystals. In addition to the typical green emission observed in both CsPbBr 3 and Cs 4 PbBr 6 , Eu-PNCs has a blue emission band. The overall photoluminescence quantum yield is much higher than the pristine PNCs. We perform detailed analysis of the crystal structure and luminescence properties of the nanocrystals with and without EuBr 2 modification. An X-ray absorption fine structure analysis reveals the local structure of Eu in the PNCs. We propose that the cation-solvent interaction strongly influences the crystallization process of ternary Cs x Pb y Br z , and the formation of Eu-solvent complexes further modifies the PNCs surface resulting in unique luminescence properties.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yaqin Rong,Shuai Li,Junjian Niu,Zhongde Wang,Xiaogang Hao,Chengwen Song,Tonghua Wang,Guoqing Guan
Radioactive cesium ( 137 Cs) ions exhibit high-energy gamma radiation and long half-life. When they enter water body, serious environmental problems and damage to the human body are always generated. Herein, an electroactive composite membrane was facilely prepared by uniformly deposition of nickel hexacyanoferrate (NiHCF) nanoparticles on the surface and inner wall of coal-based tubular carbon membrane (CTCM) for rapid and selective separation of Cs + from wastewater. This NiHCF incorporated CTCM tube exhibited an extremely high removal rate (over 99.99%) over a long period. Meanwhile, it also demonstrated extreme Cs + selectivities even in the solutions with high coexisting ion concentrations (e.g., Cs + :Na + = 1:99, Cs + :K + = 1:99). The rapid and selective Cs + uptake/release should be attributed to the better dispersion of NiHCF nanoparticles with high selectivity to Cs + in the CTCM tube, which reduced the mass transfer distance, increased fluid turbulence and accelerated mass transfer rate. It is expected that such a NiHCF incorporated CTCM tube could be a promising alternative of conventional materials for the separating of radioactive Cs + ions.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Shijue Wang,Ju Xiao,Fei Yuan,Long Li,Yafei Guo,Yingchun Xie,Tianlong Deng
In order to separate cesium nitrate from the eluant mixture sodium nitrate solution, the phase equilibrium of the ternary system (NaNO 3 + CsNO 3 + H 2 O) at 338.15 K and 0.1 MPa was investigated using the isothermal equilibrium solution method, and the solubilities and physicochemical properties (density and refractive index) of the system were determined, experimentally. According to the experimental data, the phase diagram and physicochemical properties versus the composition diagram of the ternary system at 338.15 K were established for the first time. There is one invariant point (NaNO 3 + CsNO 3 ), two univariant curves, and two crystallizing regions corresponding to NaNO 3 and CsNO 3 . The phase diagram belongs to a simple-type ternary system, and neither double salt nor solid solution was formed. Based on the phase diagrams of this system at 298.15 and 338.15 K, the cycle separation process for CsNO 3 recovery from the eluant of sodium nitrate mixture solution was evolved. It is worth noting that 90.29 % CsNO 3 can be separated from the mixed solution after three cycles. It is significant for the green recovery of cesium nitrate from the eluent solution containing sodium nitrate effectively.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 11
·期 4
·1784-1789
·
IF 7.233
Qiang Jing,Yue Xu,Yucong Su,Xing Xing,Zhenda Lu
Cs4PbBr6 nanocrystals (NCs) have been recently studied as they can enhance the light emitting efficiency and stability of CsPbBr3 NCs. However, the synthesis of Cs4PbBr6 NCs is often accompanied by the generation of CsPbBr3 NCs, and less attention has been paid to how to exactly control their formation. Here, we investigated the key factors in deciding the final products in the hot-injection synthesis by a modified amine-free method. We found that the molarity ratio of Cs/Pb dominated the final products, while the amount of bromine had a relatively small effect. In addition, introducing a certain amount of oleylamine into the amine-free reaction leads to the formation of Cs4PbBr6, instead of CsPbBr3 NCs. This clearly shows that the protection ligand oleylamine also plays an important role in the formation of Cs4PbBr6 NCs. This well understood and fine control of the synthesis may inspire a new CsPbBr3@Cs4PbBr6 core–shell structure, with the same chemical elements but a different crystal phase in the core and the shell. This nanostructure would open a new avenue for enhancing the stability of perovskite nanocrystals.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 319
·期 3
·737-748
·
IF 1.186
Feng Sheng,Ni Ziqiu,Feng Shanshan,Zhang Zhihui,Liu Shuguang,Wang Runbai,Hu Jiawei
In this study, the UiO-66/Fe 3 O 4 /GO composite was prepared by one step method for removal of cesium ions (Cs + ) in water and exhibited excellent adsorption capacity for Cs + (62.07 mg g −1 ), which can be attributed to the size compatibility of nanosized cavities and the addition of GO. As supporting matrix, GO decreased particle aggregation and increased the surface area of the adsorbent. The composite had good acid and alkali resistance, thermal stability, rapid adsorption rate and can be separated from water by magnetic separation rapidly.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Jiayu Qin,Linxue Yan,Senjian Han,Xiaonan Yang,Yafei Guo,Long Li,Tianlong Deng
As an effective adsorbent, prussian blue (PB) has been used to selectively eliminate radioactive cesium from the complex and change wastewater. Multiple attempts were introduced to refrain from the recovery difficulty of direct application of PB. This study designed a novel strategy of tannic acid (TA) assisted multilayer PB immobilization on a commercial substrate for cesium adsorption. As an effective binder, TA-Fe was successfully applied to immobilize and disperse PB to increase the number of active particles. The resulting composite membrane (M TA-PB ) showed excellent cesium selectivity with a high K d value of 8986 mL/g in geothermal water and maintained its cesium adsorption ability after 5 cycles. Compared with the reported PB powder, the loaded PB gave full play to the adsorption performance. The convenient fabrication method and effective removal of Cs from complex solutions demonstrated that the M TA-PB has excellent potential for practical application in low wastewater concentrations.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 13
·3126
·
IF 4.2
Dong Li,Siyu Tian,Qiuhua Qian,Caiyun Gao,Hongfang Shen,Fei Han
Cesium doped WO3(Cs-WO3) photocatalyst with high and stable oxidation activity was successfully synthesized by a one-step hydrothermal method using Cs2CO3as the doped metal ion source and tungstic acid (H2WO4) as the tungsten source. A series of analytical characterization tools and oxygen precipitation activity tests were used to compare the effects of different additions of Cs2CO3on the crystal structure and microscopic morphologies. The UV–visible diffuse reflectance spectra (DRS) of Cs-doped material exhibited a significant red shift in the absorption edge with new shoulders appearing at 440–520 nm. The formation of an oxygen vacancy was confirmed in Cs-WO3by the EPR signal, which can effectively regulate the electronic structure of the catalyst surface and contribute to improving the activity of the oxygen evolution reaction (OER). The photocatalytic OER results showed that the Cs-WO3-0.1 exhibited the optimal oxygen precipitation activity, reaching 58.28 µmol at 6 h, which was greater than six times higher than that of WO3-0 (9.76 μmol). It can be attributed to the synergistic effect of the increase in the conduction band position of Cs-WO3-0.1 (0.11 V) and oxygen vacancies compared to WO3-0, which accelerate the electron conduction rate and slow down the rapid compounding of photogenerated electrons–holes, improving the water-catalytic oxygen precipitation activity of WO3.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）