JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
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2023
·Vol. 34
·期 7
·1003-1012
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IF 1.4
Wang Junlian,Liu Hui,Xu Wen,Chang Ziyong,Wang Peilong,Wang Huajun
Designing highly efficient dialkylphosphinic acid extractant for zirconium/hafnium separation relies on systematic structure-property studies. In this paper, dialkylphosphinic acids with different substituents at β-C, γ-C and δ-C for zirconium and hafnium extraction and separation from H2SO4 media were investigated. The results show that substituents at β-C, γ-C and δ-C reduce the extraction ability of dialkylphosphinic acids for both zirconium and hafnium. The substituent effect at β-C is greater than that at γ-C and δ-C. The larger steric hindrance of the substituents (ethyl > methyl > H), the weaker extraction ability of the dialkylphosphinic acids. The zirconium and hafnium separation behavior is related to the extraction ability of dialkylphosphinic acids. Dialkylphosphinic acids with stronger extraction ability show better zirconium/hafnium separation performance at higher acidity of 2.0 mol L-1 H2SO4, while those with weaker extraction ability show better zirconium and hafnium separation performance at lower acidity of 0.25 mol L-1 H2SO4. The highest hafnium/zirconium separation factor (βHf/Zr) in the current study occurs with (2-ethylhexyl)(2,4,4-trimethylpentyl)phosphinic acid (USTB-1), which reaches 19.2.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 37
·2101674
·
IF 13.281
Xiaolei Deng,Ziliang Li,Hui Liu,Yijian Zhao,Lingxia Zheng,Xiaowei Shi,Liang Wang,Xiaosheng Fang,Huajun Zheng
In order to satisfy the growing requirements of wearable electronic devices, 1D fiber-shaped devices with outstanding sensitivity, flexibility, and stability are urgently needed. In this study, a novel inorganic-organic heterojunction fibrous photodetector (FPD) based on poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and highly ordered TiO 2 nanotube array is fabricated, which endows a high responsivity, large external quantum efficiency, and fast response speed at 3 V bias. To further ameliorate its performance in the self-powered mode, a facile acid treatment is adopted and the assembled H-PEDOT:PSS/TiO 2 FPD demonstrates outstanding self-powered properties with ≈3000% responsivity enhancement (161 mA W −1 at 0 V under 365 nm irradiation, photocurrent enhancement of ≈50 times) compared with the untreated device. It is found that the concentrated H 2 SO 4 post-treatment helps decrease the tube wall thickness of TiO 2 and partially removes the insulated PSS component in PEDOT:PSS, leading to enhanced conductivity and facilitated charge transportation, and thereby superb responsivity/photocurrent enhancement of self-powered H-PEDOT:PSS/TiO 2 FPD. This low-cost and high-performance self-powered FPD shows high potential for applications in wearable electronic devices.
研究领域:
材料科学
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光电子学
·
纳米技术
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柔性电子学
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光电探测器
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Linquan Sun,Xukun Zhang,Lina Wang,Hongdong Yu,Fancheng Meng,Tao Qi,Yihe Peng
A fluoride-free solvent extraction method for niobium separation in leached sulfuric mother liquor of ilmenorutile was proposed in this paper. The extraction system comprising trioctyl tertiary amine (N235) and 4-methyl-2-pentanone (MIBK) demonstrated good extraction efficiency and selectivity of niobium over titanium and iron impurities in sulfuric acid–oxalate solutions. Details of extraction, scrubbing, and stripping processes were investigated herein, and its practical effectiveness in both batch and multi-stage simulated counter-current modes was verified. Over 73.8% niobium was extracted under optimum conditions, and only 2.8% titanium and 1.7% iron were co-extracted. The recovery of niobium reached 99.1% in the four-stage simulated counter-current extraction tests. In the three-stage simulated counter-current stripping tests, the stripping efficiency of niobium reached 99.7% with 2.0 mol/L HNO 3 . Qualified niobium oxide products were prepared. The enthalpy change, entropy change, and the standard Gibbs free energy change (Δ H o , Δ S o , and Δ G o , respectively) corroborated the exothermicity, orderliness, and spontaneity of the reaction. The possible composition of the extraction complex was [NbO(C 2 O 4 ) 2 (H 2 O) 2 ] − , as supported by a Fourier transform infrared spectroscopy and ultraviolet–visible spectrophotometry. The extraction mechanism was inferred to be the outer-sphere complexation through physical binding which was the association of R 3 NH + in N235 with the [NbO(C 2 O 4 ) 2 (H 2 O) 2 ] − . A preliminary mass balance indicated that 203.92 g Nb 2 O 5 was generated from 1000 g raw material ilmenorutile.
研究领域:
冶金学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Gang Xu,Aiqin Wang,Jifeng Pang,Mingyuan Zheng,Jianzhong Yin,Tao Zhang
Cellulose is the most abundant biomass in nature, and its catalytic conversion to commodity chemical ethylene glycol represents an important advance towards sustainable chemistry. In previous work, we have shown that tungstic acid plays a key role in selective C–C cleavage to form glycolaldehyde and then ethylene glycol. To further enhance the efficiency of tungstic acid, a series of additives were investigated in this work. Among various acid additives, H 2 SO 4 stands out as the most remarkable additive; ethylene glycol yield was enhanced from 32.6% to 52.6% at a H 2 SO 4 /H 2 WO 4 molar ratio of 0.03 and a H 2 WO 4 /cellulose weight ratio of 0.05, that is, an extremely dilute acid concentration. Weakly acidic sulfates (e.g., CuSO 4 and FeSO 4 ) have also been demonstrated to be highly efficient additives to improve the catalytic efficiency of tungstic acid, through promoting the hydrolysis of cellulose.
研究领域:
化学工程
·
可持续化学
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产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Yan Liu,Yue Sun,Zheng Peng
Salicylic acid (SA) is an important chemical raw material, but its production process generates large amounts of phenol-containing hypersaline wastewater . Bipolar membrane electrodialysis (BMED) technology was proposed to remove Na 2 SO 4 from this wastewater and generate NaOH and H 2 SO 4 . The influences of initial pH in feed solution, current density, flow velocity, initial Na 2 SO 4 concentration and volume ratio on the BMED process were investigated. These findings revealed that pH had no significant effect on the desalination rate, but affected the migration of organics including phenol and SA. When the input current density was 40 mA/cm 2 , flow velocity was 4.0 cm/s and the volume ratio was 2:1, the concentrations of H 2 SO 4 and NaOH could reach the maximum at 0.97 mol/L and 1.56 mol/L respectively, with initial Na 2 SO 4 concentration of 80 g/L and corresponding to a desalination rate of 96.3%. The current efficiency of acid was 55.2% and that of base was 50.2%, and energy consumption was 2.89 kWh/kg H 2 SO 4 and 3.98 kWh/kg NaOH. These results confirmed BMED technology could treat simulated SA wastewater effectively and produce H 2 SO 4 and NaOH. It provides a theoretical basis and guidance for the practical treatment of this type of wastewater.
研究领域:
环境工程
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化学工程
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2022
·
IF 3.251
Hengyuan Liu,Xingjiang Wu,Jianhong Xu
Electrocatalytic nitrogen reduction reaction (NRR) is regarded as a potential routine to achieve environment-friendly ammonia production, because of its abundant nitrogen resources, clean energy utilization and flexible operation. However, it is hindered by low activity and selectivity, in which condition well-designed catalysts are urgently in need. In this work, a binary Mo/Ir nanodots/carbon (Mo/Ir/C) hetero-material is efficiently constructed via microfluidic strategy, of which the nanodots are homogeneously distributed on the carbon skeleton and the average size is approximately 1 nm. Excellent performance for NRR is obtained in 1 mol L −1 KOH, of which the optimized ammonia yield and faradic efficiency are 7.27 μg h −1 cm −2 and 2.31% respectively. Moreover, the optimized ammonia yield of 6.20 μg h −1 cm −2 and faradic efficiency of 10.59% are also obtained in 0.005 mol L −1 H 2 SO 4 . This work achieves the continuous-flow synthesis and controllable adjustment of hetero-materials for favorable morphologies, which provides an innovative pathway for catalyst design and further promotes the development of ammonia production field.
研究领域:
材料科学
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化学工程
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Feifei Huang,Xiuquan Yao,Xiaofang Luo
This work explores the use of a common molecule on pharmaceuticals, 1-Ethyl-5-Mercapto Tetrazole (EMTT), to protect copper in 0.5M H 2 SO 4 solution. The addition of EMTT in sulfuric acid solution was verified to be protective of copper by testing electrochemistry, with a maximum inhibition efficiency of 88.30% at 200 mg/L. The electrochemical results were supported by the results of the surface morphology of copper specimen immersed. Finally, quantum chemical calculations were carried out to explain the retarding effect mechanistically.
研究领域:
腐蚀科学
·
电化学
·
材料科学
·
表面化学
·
量子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2014
·
IF 2.063
Jianhong Tan,Lei Guo,Shenying Xu
Corrosion inhibition of indole-3-carboxylic acid (ICA) on mild steel in 0.1 M H 2 SO 4 solution has been studied through weight loss, potentiodynamic polarization , electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM) experiments. Plots from polarization and EIS techniques show ICA acts as a mixed type inhibitor and its high inhibition effectiveness is assumed to occur via the adsorption of the inhibitor molecules on steel surface. It is then found that this adsorption behavior obeys the Langmuir adsorption isotherm . Theoretical techniques incorporating molecular mechanics and molecular dynamics were used to simulate the adsorption of ICA molecule on Fe(1 1 0) surface.
研究领域:
材料科学
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腐蚀科学
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电化学
·
表面工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Bo Wang,Qiaowen Yang
Large amounts of spent selective catalytic reduction (SCR) catalysts were produced in industry after losing their activity. This study developed a clean and effective route of leaching and recovery of vanadium (V) from spent SCR catalyst. First, ascorbic acid (C 6 H 8 O 6 ) as the adjuvant can enhance vanadium leaching in H 2 SO 4 solution. The effect parameters of acid concentration, leaching temperature, leaching time and liquid-solid (L/S) ratio on the leaching efficiency of vanadium were investigated. Then, the enrichment of vanadium in the leachate to obtain the black cake was carried out through adjusting pH value. The effects of vanadium concentration and pH on the precipitation efficiency of vanadium were studied. Finally, after alkaline dissolution and oxidation of the black cake, ammonium chloride (NH 4 Cl) was selected and used as the precipitant to obtain the ammonium poly-vanadate (APV). The final product vanadium pentoxide (V 2 O 5 ) was obtained through roasting APV at 550 ℃ for 1.0 h. The black cake, APV and V 2 O 5 were analyzed by the characterization of XRD or XRF . This study may introduce a new perspective for the effective usage of vanadium from spent SCR catalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Lingjun Zhu,Hao Xu,Xiaoyan Yin,Shurong Wang
With hydrothermal reaction, lignocellulosic biomass can be efficiently converted into furfural (FF) and levulinic acid (LA), both of which are key platform compounds that can be used for the subsequent preparation of aviation fuels. In order to reduce the acid concentration in traditional hydrolysis and provide a reaction system with good catalytic activity, we propose a biomass conversion route as dilute acid hydrolysis coupled with solid acid catalysis. Firstly, at different temperatures, the hemicellulose and cellulose in corn stover were step-hydrolyzed by sulfuric acid solution with a concentration of 0.9 wt. % to produce xylose and glucose, with conversion reaching 100% and 97.3%, respectively. Subsequently, a new resin-derived carbon-based solid acid catalyst was used to catalyze the aforementioned saccharide solutions to obtain FF with yield of 68.7 mol % and LA of 70.3 mol %, respectively. This work provides a promising approach for the efficient production of bio-aviation fuel precursors.
研究领域:
生物化学
·
可再生能源
✓ 已验证
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Hongxiang Xie,Zhufan Zou,Haishun Du,Xinyu Zhang,Xumei Wang,Xianghao Yang,Hui Wang,Guangbi Li,Long Li,Chuanling Si
A mild and efficient approach for the preparation of cellulose nanocrystals (CNCs) was developed by using mixed H 2 SO 4 /Oxalic acid hydrolysis. In this process, the mixed acid of sulfuric acid, oxalic acid and H 2 O in an optimal mass ratio of 1:5:4 was used to produce CNCs from bleached eucalyptus kraft pulp (BEKP) at 80 °C for 2–5 h. The CNCs with a diameter range of 5–20 nm and a length range of 150–400 nm were obtained at a high yield (>70%) and showed excellent dispersion stability in water and good thermal stability. Moreover, the dosage of sulfuric acid can reduce to 2.4 g/g CNCs in this mixed acid hydrolysis, which is far lower than that of the typical 64% sulfuric acid hydrolysis (55 g/g CNCs, tested in this work). In addition, 91±2% of oxalic acid could be recovered by a simple recrystallization operation.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Sustainability
·
2025
·Vol. 17
·期 6
·2359
·
IF 3.3
Ying Zhu,Xingguang Hao,Xin Sun,Fei Wang,Kai Li,Ping Ning,Lei Shi
Herein, targeting arsenic-containing acidic wastewater generated from washing arsenic-containing flue gas with concentrated sulfuric acid, the arsenic removal efficiency using H2S was investigated. The effects of H2S concentration, the gas flow rate, H2SO4concentration, temperature, and Cl−/F−ions on arsenic removal were studied. Results indicate that H2S concentration is the primary factor. Arsenic was precipitated as amorphous As2S3, reducing residual arsenic to 0.28 mg/L. Cl−enhanced arsenic removal, yielding a residual concentration of 0.68 mg/L, while F−exhibited a dual effect: the inhibition at low concentrations and promotion at high concentrations. At 100 g/L F−, the residual arsenic was 29.59 mg/L. These effects are attributed to Cl−/F−altering the surface electrochemical properties of As2S3particles. Additionally, both ions improved As2S3hydrophobicity. This study provides insights for purifying arsenic-containing sulfuric acid.
研究领域:
环境化学
·
废水处理
·
湿法冶金
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）