JOURNAL OF CRYSTAL GROWTH
·
2021
·
IF 1.797
Jing Zhao,Hongjie Luo,Xiao Huang
The migration and crystallization of CuSO 4 solution characterized by color change property on the surface of glass of hydrophobic property, capillaries and porous resin materials were observed online in real time. The research results indicated that under the condition of stable environment, crystals generated by CuSO 4 droplets were relatively complete, and crystals would also easily be accumulated both inside and outside of the capillaries, in particularly, the crystal morphology inside the capillaries altered along with the change of solution state. Meanwhile, there were parabolic migration and crystallization of the salt solution in the porous material samples, and the samples with saturated salt solution had a wide range of crystal areas when the salt solution had been completely crystallized in the porous samples, while the crystal belt in the interior samples was produced with less salt solution. In this paper, the parabola with opposite direction in the process of salt solution migration and crystallization, as well as the distribution of whitespace and crystal belt were found for the first time.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 5
·3033-3038
·
IF 3.9
Yi-Jie Wang,Yu-Fen Bao,Xiao-Jie Lu,Jia-Qi Dong,Ding-Hua Liu
An SBA-15 loaded CuSO4 catalyst was designed and prepared for the highly selective production of 2,6-di-tert-butyl-p-cresol (BHT) from p-cresol and isobutylene. The acidity of solid acid catalysts was altered by varying the loading amount of CuSO4. Among them, 10% CuSO4/SBA-15 exhibited the greatest catalytic performance in the alkylation reaction with a BHT yield of 85.5%. After four cycles, the yield of BHT exceeded 70%. Overall, the catalyst has excellent catalytic performance and can be utilized as a catalyst for efficient BHT production.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Yanke Yu,Jinsheng Chen,Jinxiu Wang,Yanting Chen
A series of CuSO 4 /TiO 2 catalysts were prepared using a wet impregnation method. The activity of each sample in the selective catalytic reduction of NO by NH 3 (NH 3 -SCR) was determined. The effects of SO 2 and H 2 O, and their combined effect, on the activity were examined at 340 °C for 24 h. The catalysts were characterized using N 2 adsorption-desorption, X-ray diffraction, X-ray photoelectron spectroscopy, temperature-programmed reduction of H 2 (H 2 -TPR), temperature-programmed desorption of NH 3 (NH 3 -TPD), and in situ diffuse-reflectance infrared Fourier-transform spectroscopy (DRIFTS). The CuSO 4 /TiO 2 catalysts had good activities, with low production of N 2 O above 340 °C. SO 2 or a combination of SO 2 and H 2 O had little effect on the activity, and H 2 O caused only a slight decrease in activity during the experimental period. The NH 3 -TPD and H 2 -TPR results showed that CuSO 4 increased the amounts of acid sites and adsorbed oxygen on the catalyst. In situ DRIFTS showed that the NH 3 -SCR reaction on the CuSO 4 /TiO 2 catalysts followed an Eley–Rideal mechanism. The reaction of gaseous NO with NH 3 adsorbed on Lewis acid sites to form N 2 and H 2 O could be the main reaction pathway, and oxygen adsorption might favor this process.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 43
·20777-20785
·
IF 3.925
Yanke Yu,Mengqiao Geng,Desheng Wei,Chi He
Selective catalytic oxidation of NH3 (NH3-SCO) is a promising method to reduce NH3 pollution. The Pt-based catalysts exhibited excellent activity in the NH3-SCO reaction under low temperatures. However, it was easy for the NH3 to be oxidized to N2O and NOx (NO and NO2) over the Pt-based catalyst, causing a low N2 selectivity. The CuSO4, which could supply both Brønsted and Lewis acid sites on the catalyst, was used to promote N2 selectivity. The N2 adsorption–desorption, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), inductively coupled plasma mass spectrometry (ICP-MS), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), NH3-temperature programmed desorption (NH3-TPD), H2-temperature programmed reduction (H2-TPR) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) were used to characterize the catalyst. The addition of CuSO4 could suppress the formation of N2O and NOx, thus the highest N2 selectivity on the catalyst increased from 21.2% to 78.1%. An imide mechanism was the main reaction mechanism on the Pt/TiO2 catalyst. After adding CuSO4, the NH3-SCO reaction over the CuSO4-Pt/TiO2 catalyst mainly followed an i-SCR mechanism where NH3 was oxidized to N2O and NOx, and then the newly formed N2O and NOx were reacted with NH3/NH4+ adsorbed on the Lewis and Brønsted acid sites via an NH3-SCR reaction over the catalyst, and finally N2 was formed. The acid sites performed an important role in the formation of N2 and this work should provide an effective method to promote N2 selectivity in a NH3-SCO reaction.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Chenyang Song,Yaoyao Jiao,Zihan Tian,Qingqing Qin,Shuhao Qin,Jing Zhang,Jianxin Li,Zhenyu Cui
To apply membrane separation technology to the treatment of low-concentration heavy metal ion wastewater, it is essential to fabricate a nanofiltration (NF) membrane with high flux and excellent rejection. In this work, organics (polyethyleneimine, gallic acid, trimesic acid, and polyacrylic acid) with different charges were successively introduced onto the outer surface of hollow-fiber NF membranes via chemical modification. That regulated the membrane surface charge under the premise of maintaining a loose separation layer. A negative-positive dual-charged membrane with a large mean effective pore size and long charged channels was successfully constructed. The evolution regularity of the microstructure of the separation layer was explored. The relation between a microstructure for a negative-positive dual-charged layer and low-concentration CuSO 4 removal was interpreted. An effective removal (94.2%) was achieved while maintaining a high permeability (29.6 L m −2 h −1 bar −1 ). Also, the as-prepared membrane showed good acid resistance and an excellent anti-fouling property and regeneration ability after cleaning by sulfuric acid. The flux recovery ratio and rejection recovery ratio were as high as 96.9% and 99.2% respectively. This work provides a reference for fabricating high performance hollow-fiber NF membranes to effectively remove heavy metal ions with low-concentration.
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 Environmental Sciences
·
2020
·
IF 4.302
Yanke Yu,Jiali Zhang,Changwei Chen,Chi He,Jifa Miao,Huirong Li,Jinsheng Chen
CuSO 4 /TiO 2 catalysts with high catalytic activity and excellent resistant to SO 2 and H 2 O, were thought to be promising catalysts used in Selective catalytic reduction of nitrogen oxides by NH 3 . The performance of catalysts is largely affected by calcination temperature. Here, effects of calcination temperature on physicochemical property and catalytic activity of CuSO 4 /TiO 2 catalysts were investigated in depth. Catalyst samples calcined at different temperatures were prepared first and then physicochemical properties of the catalyst were characterized by N 2 adsorption-desorption, X-ray diffraction, thermogravimetric analysis , Raman spectra , Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption of NH 3 , temperature-programmed reduction of H 2 and in situ diffuse reflectance infrared Fourier transform spectroscopy . Results revealed that high calcination temperature had three main effects on the catalyst. First, sintering and anatase transform into rutile with increase of calcination temperature, causing a decrement of specific surface area. Second, decomposition of CuSO 4 under higher calcination temperature, resulting in disappears of Brønsted acid sites (S–OH), which had an adverse effect on surface acidity. Third, CuO from the decomposition of CuSO 4 changed surface reducibility of the catalyst and favored the process of NH 3 oxidation to nitrogen oxides (NO x ). Thus, catalytic activity of the catalyst calcined under high temperatures (≥600°C) decreased largely.
研究领域:
催化
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环境化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yanke Yu,Desheng Wei,Zhaojian Tong,Jinxiu Wang,Jinsheng Chen,Chi He
Ammonia (NH 3 ) is a critical component causing environmental problems like haze and water pollution. Selective catalytic oxidation of ammonia (NH 3 -SCO) to N 2 and H 2 O is a promising method to abate NH 3 emission. However, inferior SO 2 tolerance is still a tremendous challenge to be conquered for present NH 3 -SCO catalysts regarding practical applications. Application of materials which was difficult to be sulfated by SO 2 should be an effective way to solve this problem. Here, a ReO x -CuSO 4 /TiO 2 catalyst which coupled the advantages of ReO x (Rhenium oxides, supplying highly active adsorbed surface oxygen enhancing NH 3 -SCO reaction) and CuSO 4 (providing Brønsted acid sites inhibiting the formation of N 2 O) was rationally fabricated. Results indicated that ReO x -CuSO 4 /TiO 2 catalyst exhibited excellent catalytic performance in NH 3 -SCO with almost 100% of NH 3 oxidized at 300 °C (N 2 selectivity as high as 96%). Crucially, the composite catalyst exhibited incredible activity and stability under harsh reaction conditions toward SO 2 (600 ppm) and H 2 O (4.0 vol%) owing to the superior inhibition capability for SO 2 adsorption. In situ DRIFTS, in situ Raman and in situ XPS demonstrated that the NH 3 -SCO reaction over ReO x -CuSO 4 /TiO 2 catalyst mainly obeyed a N 2 H 4 reaction mechanism and oxidation–reduction circle between Re 7+ and Re 6+ played a vital role. Moreover, SO 2 would not affect this reaction mechanism on ReO x -CuSO 4 /TiO 2 catalyst. The knowledge and understanding reported could provide critical insights for the design and optimization of efficient materials for industrial NH 3 oxidative elimination.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOORGANIC CHEMISTRY
·
2024
·
IF 4.5
Yuchen Wang,Shi-Chao Lu,Hui Wen,Chunyue Zhao,Yanfei Jiang,Huaqing Cui
The limitations of commonly used sodium ascorbate-based catalyst system for copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction include excess production of reactive oxygen species and rapid catalyst deactivation. In this study instead of using a highly active reducing agent, such as, sodium ascorbate, we chose reducing sugar as a mild reducing agent to build up the catalyst system for CuAAC reaction. Interestingly, the bicinchoninic acid (BCA) assay system containing reducing sugar satisfies the essential elements of the catalyst system for CuAAC reaction. We found that CuSO 4 /BCA/Reducing sugar system can catalyze the CuAAC reaction but with low yield. Rational analyses of various parameters in CuSO 4 /BCA/Glucose catalyst system suggested storage at room temperature might enhance the catalytic activity, which was proven to be the case. Importantly, the system remains stable at room temperature and minimal H 2 O 2 was detected. Notably, our study showed that the coordination between the slow reduction of Cu(I) by reducing sugar and the selective chelation of Cu(I) by BCA is key to developing this system. The CuSO 4 /BCA/Reducing sugar catalyst system was successfully applied to various CuAAC reaction based bioanalyses, and it is suitable for the CuAAC reaction based bioanalyses that are sensitive to ROS or request long reaction time.
研究领域:
化学
·
生物化学
·
分析化学
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催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Ye Yuan,Jia Hu,Yu Wang,Leilei Huang,Jiayun Zheng,Yufeng Zhao,Yiyun Chen,Cheng Chen,Francis Verpoort
α-Hydroxy ketones are important building blocks in biological, pharmaceutical and synthetic chemistry. In this work, diverse α-hydroxy ketones were efficiently constructed through the CO 2 -promoted hydration process of propargyl alcohols, which was catalyzed by a system consisted of economical CuSO 4 ·5H 2 O and a green 1-butyl-3-methylimidazolium acetate ionic liquid. Particularly, this catalytic system exhibited excellent activity under atmospheric CO 2 or even mimetic flue gas (20 vol% of CO 2 ). Moreover, this system employed the lowest metal loading ever reported (0.004–0.25 mol%) meanwhile reached the highest turnover number (11700) for the target hydration reaction. Additionally, this is the first reported Cu catalytic system with reliable recyclability, which could be easily reused at least 6 times with yields higher than 85%.
研究领域:
催化
·
绿色化学
·
有机合成
✓ 已验证
DOI
高影响因子
Biomedical Materials
·
2024
·
IF 3.9
Xiaolu Chen,Dawei Yan,Hao Deng,Hulin Yang,Suping Peng,Wei Zhang,Shijie Cai,Qiyi Zhang,Haohao Ren,Yonggang Yan
Stopping postoperative soft tissue adhesions is one of the most challenging clinical problems that needs to be addressed urgently to avoid secondary injury and pain to patients. Currently, membrane materials with anti-protein adsorption and antibacterial activity are recognized as an effective and promising anti-adhesion barrier to prevent postoperative adhesion and the recurrent adhesion after adhesiolysis. Herein, poly(amino acid) (PAA), which is structurally similar to collagen, is selected as the membrane base material to successfully synthesize PAA-5 membranes with excellent mechanical and degradation properties by in-situ melt polymerization and hot-melt film-forming technology. Subsequently, CuSO4/H2O2 induced co-deposition of the polydopamine/polysulfobetaine methacrylate (PDA/PSBMA) coatings brought excellent biological properties to the PAA-5 membranes. In vitro studies indicated that the introduction of copper ions and quaternary ammonium salts resulted in superior hemocompatibility, anti-protein activity and cytocompatibility of PDC-5S and PDC-10S. Additionally, PDC-5S and PDC-10S demonstrated significant antibacterial activity against E. coli and S. aureus, with an inhibition rate of more than 90%. As a result, this study sheds light on newly discovered PAA membranes with anti-protein adsorption and antibacterial activity can sever as one of the promising candidates for the prevention of postoperative peritoneum adhesions.
研究领域:
材料科学
·
生物医学工程
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 7
·1490
·
IF 4.2
Qiang Song,Xiong Tong,Pulin Dai,Xian Xie,Ruiqi Xie,Peiqiang Fan,Yuanlin Ma,Hang Chen
In industrial manufacturing, pyrrhotite(Fe1−xS), once depressed, is commonly activated for flotation. However, the replacement of CuSO4is necessary due to the need for exact control over the dosage during the activation of pyrrhotite, which can pose challenges in industrial settings. This research introduces the use of FeSO4for the first time to efficiently activate pyrrhotite. The impact of two different activators on pyrrhotite was examined through microflotation experiments and density functional theory (DFT) calculations. Microflotation experiments confirmed that as the CuSO4dosage increased from 0 to 8 × 10−4mol/L, the recovery of pyrrhotite initially increased slightly from 71.27% to 87.65% but then sharply decreased to 16.47%. Conversely, when the FeSO4dosage was increased from 0 to 8 × 10−4mol/L, pyrrhotite’s recovery rose from 71.27% to 82.37%. These results indicate a higher sensitivity of CuSO4to dosage variations, suggesting that minor alterations in dosage can significantly impact its efficacy under certain experimental conditions. In contrast, FeSO4might demonstrate reduced sensitivity to changes in dosage, leading to more consistent performance. Fe ions can chemically adsorb onto the surface of pyrrhotite (001), creating a stable chemical bond, thereby markedly activating pyrrhotite. The addition of butyl xanthate (BX), coupled with the action of Fe2+on activated pyrrhotite, results in the formation of four Fe-S bonds on Fe2+. The proximity of their atomic distances contributes to the development of a stable double-chelate structure. The S 3p orbital on BX hybridizes with the Fe 3d orbital on pyrrhotite, but the hybrid effect of Fe2+activation is stronger than that of nonactivation. In addition, the Fe-S bond formed by the addition of activated Fe2+has a higher Mulliken population, more charge overlap, and stronger covalent bonds. Therefore, Fe2+is an excellent, efficient, and stable pyrrhotite activator.
研究领域:
矿物加工工程
·
理论化学
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Da Li,Jian Liu,Hulin Gao,Jiamei Hao,Yunlong Yu
The unavoidable presence of ionic substances in the ore pulp can adversely effects on the separation of pyrite from other valuable metal sulfide ores. Developing new reagents to eliminate this effect is of great significance. In this study, a novel approach was proposed to depress pyrite by utilizing sodium trithiocarbonate (Na 2 CS 3 ) as a depressant in the lime-CuSO 4 system. The results of the micro-flotation experiments showed that a low dosage of Na 2 CS 3 in the lime-CuSO 4 system could effectively depress pyrite. The presence of CuSO 4 in the solution which improves the ability of BX to adsorb on the surface of the pyrite was also revealed by the analysis of LEIS, UV–Vis, and contact angle, while the addition of Na 2 CS 3 effectively hindered the adsorption of BX. XPS and SEM-EDS analysis results showed that Na 2 CS 3 forms a complex with Cu 2+ and adsorbs onto the pyrite surface, thereby impeding the adsorption of the collector and effectively depressing pyrite.
研究领域:
矿物加工
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）