Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shuyang Shi,Chen Yang,Baozhong Ma,Hui Yang,Zhihe Cao,Yubo Liu,Yongqiang Chen,Chengyan Wang
Ga exhibits enrichment in coal-based solid waste, establishing it as a promising alternative source for Ga recovery. The HNO 3 pressure leaching process effectively achieves simultaneous leaching of Al and Ga while retaining most of the Fe in the residue. However, separating Ga from acidic solutions containing Fe and Al remains a persistent challenge in hydrometallurgy due to their similar physicochemical properties. Herein, a simplified and effective two-stage sequential solvent extraction process using acid phosphorus extractants (P507 and P204) for selective Ga recovery was proposed. Under optimized conditions, P507 removed 97.2 % of Fe from coal gangue HNO 3 leach liquor with limited co-extraction of Ga (10.1 %) and Al (5.7 %). Subsequent P204 extraction recovered 99.2 % Ga with only 9.1 % Al co-extraction from the Fe raffinate. Stripping with 2 mol·L –1 H 2 SO 4 yielded 88.0 % Ga recovery, with the extractants showing excellent regeneration and cycling performance. Mechanistic studies including FT-IR, UV-Vis, ESI-MS, and stoichiometric analysis confirmed coordination through both P = O and P–O–H groups, forming Fe(HA)A 3 and Ga(HL)L 3 complexes (A = P507; L = P204 ligands), respectively. This study presents a highly efficient approach for the separation of Fe/Ga/Al and Ga recovery from HNO 3 leach liquor, featuring exceptionally low acid depletion.
研究领域:
湿法冶金
·
溶剂萃取
·
资源回收
·
无机化学
·
环境工程
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产品关联
DOI
高影响因子
Food and Bioprocess Technology
·
2024
·
IF 5.3
Gao Weilan,Zheng Zhan,Chen Rongyu,Zhang Na,Wang Xuehua,Zhu Zhenzhou,Li Shuyi,Cong Xin
Selenylation modification is an effective way to improve the nutritional and health effects of tea polysaccharide, but the effects of different selenylation methods on the structure and efficacy of polysaccharides remain unclear. In this study, a series of chemically selenized tea polysaccharides (CSe-TPS, selenium content of 129.98 ~ 1454.99 µg/g) were prepared by Na 2 SeO 3 -HNO 3 method, which were promoted by heating (HCSe-TPS), ultrasound (UCSe-TPS), and pulse electric field (PCSe-TPS) treatments, respectively. These different CSe-TPSs were systematically compared with ordinary tea polysaccharides (Ord-TPS) and natural selenium-enriched tea polysaccharides (NSe-TPS) in aspect of molecular structure and biological functions. The results of molecular structure and apparent morphology showed that the particle size ( p < 0.05) and the thermal stability of Ord-TPS were reduced after selenylation modification, while the absolute potential of polysaccharide was increased ( p < 0.05), coupled with altered monosaccharide composition and changed apparent morphology. However, the main functional groups and the secondary structure of Ord-TPS did not change. The antioxidant activities of tea polysaccharides after selenylation were improved as well as their inhibitory effects on carbohydrate digestive enzymes ( p < 0.05). The total antioxidant capacity of PCSe-TPS (selenium content of 240.66 ± 1.43µmol/g) was enhanced by 85.41% compared with Ord-TPS (selenium content of 129.80 ± 3.42 µmol/g), while its IC 50 values on inhibition of α-amylase (2.91 ± 0.18 mg/mL) and α-glucosidase (0.18 ± 0.01 mg/mL) were significantly lower than other tea polysaccharides ( p < 0.05), which suggested best antioxidant and hypoglycemic activity. Moreover, tea polysaccharides with higher selenium content and smaller particle size showed better antioxidant and hypoglycemic activities. This research will provide new strategies for the application of tea polysaccharides.
研究领域:
食品科学
·
营养学
·
生物化学
·
药学
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产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2026
·
IF 6.9
Zijie Luo,Huicong Zhang,Fashe Li,Hua Wang
Background In recent years, most countries have imposed stricter standards on the sulfur content in fuel oils. Thiophene compounds, predominantly benzothiophene (BT) and dibenzothiophene (DBT), are difficult to remove from biodiesel derived from waste cooking oil. Adsorption desulfurization using activated carbon is regarded as a potential solution. But the removal efficiency of common activated carbon for thiophene could not meet the requirement. Therefore, it is important to develop a carbon material that is highly efficient and selective. Methods This study used tobacco stalks as carbon precursors and zeolite as a templating agent to prepare biomass-based zeolite templated carbon (Bio-ZTC). Subsequently, HNO 3 was used to modify its pore size and surface functional groups, resulting in a material (Bio-ZTC-M) with abundant hierarchical pore structures and surface functional groups. The adsorption performance and mechanism of Bio-ZTC-M for BT in biodiesel were investigated through characterization techniques, adsorption kinetics and molecular dynamics analyses. Significant findings Under the optimal conditions, the removal efficiency of Bio-ZTC-M for BT in biodiesel reaches 68.07 % within 30 s at 20°C. In the process of BT adsorption by Bio-ZTC-M, both physical adsorption (π-π interactions and dipole-dipole interactions) and chemical adsorption (Lewis acid-base interactions) coexist. Furthermore, increasing the proportion of ultramicropores (0.65-1 nm) and mesopores in carbon materials is beneficial to the adsorption of BT.
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 331
·期 1
·365-373
·
IF 1.371
Li Chunhui,He Hui,He Mingjian,Gao Yang,Zhang Meng,Jiao Caishan
A detailed extraction equilibrium study is experimentally performed to understand the extraction mechanisms of Ce(IV) by 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C 4 mimNTf 2 ) in 1,2-dichloroethane. Further, the influence of adding TBP on the distribution ratio is investigated and demonstrated. The ceric aqueous chemistry in the nitric acid solution and slope analysis are combined to reveal the extraction mechanism. The monovalent anionic complex HCe(NO 3 ) 6 − is the dominant species, which extracted by C 4 mimNTf 2 . Importantly, this study demonstrates the antagonistic effect between TBP and C 4 mimNTf 2 on the extraction process.
研究领域:
化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Xiao Xiao,Long Li,Zhuang Wang,Qiao Yu,Xuanhao Huang,Xingyue Liu,Qingjiang Pan,Songdong Ding
Five amine-diamide ligands (DAMIA) with varying alkyl chain lengths and steric hindrances are developed for selective extraction of Am3+ over Eu3+ in high-acidity HNO3 solution with the aim of understanding the structure–activity relationship. The ability of these ligands to extract metal ions is closely related to their basicity. The weaker the basicity is, the stronger the extraction ability is. The substituent on the aminic N has more significant effect on the extraction ability than that on the amidic N. Among the five ligands, the DAMIA containing five branched 2-ethylhexyl substituents demonstrates the highest extraction ability and selectivity at molar acidity level. Slope analysis suggests the formation of a 1:1 metal/ligand extracted species, which is also supported by the results obtained from the UV–vis spectrophotometric titration. Furthermore, the analyses of Fourier transform infrared (FT-IR), time-resolved laser-induced fluorescence spectroscopy (TRLFS), and X-ray photoelectron spectroscopy (XPS) for the extracted complex indicate that one Eu3+ ion may be nine-coordinated by one ligand molecule in a tridentate manner via two amide O atoms and one tertiary amine N atom and three bidentate NO3– ions. There is no H2O molecule in the inner coordination sphere of central Eu3+. Additionally, based on the studies of solvent extraction and complexation, the extraction of metal ions follows the neutral complexation extraction model, and the corresponding thermodynamic parameters (ΔH, ΔS, and ΔG) are also presented.
研究领域:
化学
·
核化学与放射化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Ying Zhang,Chao Qu,Decai Yang,Lanyang Wang,Youguo Luo,Qing Ye
Graphitic carbon nitride-based (g-C 3 N 4 ) catalysts that respond to visible light have exhibited substantial potential for application in water splitting for hydrogen production. However, the material faces challenges such as low quantum efficiency and restricted utilization of visible light. In this study, we developed a Z-scheme heterojunction photocatalyst comprising ultrathin g-C 3 N 4 (ExCN) and CuZnInS (CZIS), which significantly enhances the photocatalytic hydrogen production performance. Notably, the hydrogen production rate reached up to 185.23 μmol g −1 h −1 without platinum co-catalysts. Comprehensive characterization and mechanism analysis revealed that the ultrathin, porous structure and oxygen-doped characteristics of ExCN markedly increased the number of active sites and extend the visible light response range. Moreover, ExCN serves as an effective carrier for CZIS particles. The coupling of CZIS with ExCN to form a Z-scheme heterojunction effectively promoted the spatial separation of photogenerated charge carriers. The narrow bandgap of CZIS broadens the light response range, while metal sites function as electron traps, suppressing electron-hole recombination and further enhancing catalytic efficiency. This study offers new insights into the rational design of visible-light-responsive hydrogen production catalysts based on graphitic carbon nitride.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
半导体物理
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环境功能材料
·
可持续能源
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 41
·17891-17899
·
IF 2.7
Xiang Liu,Weiyi Li,Ping Wang,Zheng Xing
In recent years, hydrogels have been employed to fabricate flexible capacitors (FCs) and wearable sensors. However, achieving a balance between the electrochemical and mechanical properties of hydrogels remains a challenge. Herein, polyacrylamide/sodium alginate (PAM/SA) dual-network hydrogels with good mechanical properties and high electrochemical properties were obtained by nitric acid (HNO3) mediation. The –COO– groups on the SA network inside the hydrogel are partially acidified to –COOH under the action of HNO3, which increases the hydrogen bond density of the hydrogel. The PAM/SA hydrogel exhibited a maximum mechanical strength of 83.4 KPa and a maximum elongation at break of 471.3%. Furthermore, the conductivity (σ) of PAM/SA dual-network hydrogels increased from 36.48 mS cm−1 to 96.4 mS cm−1, and the specific capacitance of the flexible capacitor (FC) composed of the hydrogels increased by about 142.1%. Finally, the hydrogel was prepared as a wearable motion sensor, which is capable of accurately detecting the different motion states of a person. Consequently, the hydrogel has a multitude of applications in the field of FCs and wearable sensors.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Hang Yao,Gang Fu,Yuqing Ni,Lei Ni,Juncheng Jiang,Han Zhang,Zhen Cheng,Zhiquan Chen
Nitro-m-xylenes (NMX) was synthesized in semi-batch mode via m-xylene nitration using nitric acid-acetic anhydride (HNO 3 -Ac 2 O) as nitrating reagent in this work. The nitration process was optimized by response surface methodology . The yield of NMX could reach 92.40% under the optimal conditions of jacket temperature of 20 °C, 0.15 mol of HNO 3 and 0.19 mol of Ac 2 O. Corresponding large reaction enthalpy (Δ H =240.9 kJ/mol) and adiabatic temperature rise (Δ T ad,r =398.1 K) indicated the serious hazards of nitration in a thermal runaway scenario. Pyrolysis of nitration products occurred at about 320–400 °C by differential scanning calorimetry tests. The reaction order of the pyrolysis was determined to be 1.2 by adiabatic kinetic analysis . Thermal risk of the nitration process was assessed to be acceptable and level 1 via the risk matrix and Stoessel criticality diagram analyses, respectively. Furthermore, detailed nitration mechanisms for NO 2 + generation and aromatic substitution were presented. The activation free enthalpy and free energy parameters for each step were calculated by density functional theory (DFT). These findings can help understand the exothermic sources of m-xylene nitration and guide the intrinsically safer design and scale-up of the process.
研究领域:
化学工程
·
安全科学
·
理论化学
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DOI
高影响因子
CHEMICAL PAPERS
·
2017
·Vol. 72
·期 1
·51-56
·
IF 1.258
Wei Mengyi,Qian Chao,Chen Xinzhi
Based on the recycling of NO
x
, the Cu(I)- and HNO 3 -catalyzed oxidation of 2-chloro-4-(methylsulfonyl)toluene to 2-chloro-4-(methylsulfonyl)benzoic acid has been developed with an excellent yield of 84.2% and a purity of 99.7%. The optimized reaction conditions (160 °C, oxygen pressure 1.5 MPa, HNO 3 concentration 25 wt%, HNO 3 : substrate 0.5:1) use 1.0 mol% CuI as catalyst. The dosage of HNO 3 in the new process is only 25% of the stoichiometric amount and 12.5% of the amount of the traditional process. The NO
x
emission is 5% amount of the traditional process. The oxidation of several additional toluene derivatives with comparable yields demonstrates the generality to these reaction conditions.
研究领域:
化学
·
环境科学
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Shengxian Yu,Dazhuang Xu,Qing Wan,Meiying Liu,Jianwen Tian,Qiang Huang,Fengjie Deng,Yuanqing Wen,Xiaoyong Zhang,Yen Wei
Aggregation-induced emission (AIE) active fluorescence polymeric nanoparticles (FPNs) have recently received increasing interests for biomedical applications such as cell imaging , drug delivery, disease diagnosis and treatment. Fabricated strategies of AIE-active FPNs with high efficiency, simplification and tenderness are still passionately pursued to promote the development of theranostic systems. In this work, we develop a facile method for the preparation of AIE-active FPNs by adopting Ce(IV)/HNO 3 redox polymerization under near room temperature. Thus-prepared FPNs (named as PEG-PLC-1) possess unique AIE feature, great water dispersity, excellent biocompatibility and biodegradability because of the conjugation of ultra-bright AIE dye (PhE-alc) and biodegradable PEG-PCL linear copolymers . The 1 H nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), UV–Visible and fluorescence spectrometers were used to confirm the successful fabrication of AIE-active FPNs. Cell viability and cellular uptake behavior of PEG-PLC-1 FPNs were further investigated for their potential biomedical applications. Results demonstrated that PEG-PLC-1 FPNs are high water dispersity, intensive luminescence and low cytotoxicity, making them very attractive for biomedical applications. More importantly, the method for the fabrication of AIE-active biodegradable FPNs can be occurred under rather facile conditions (e.g., low temperature, free of metal catalysts, common chain transfer agent and aqueous solution) and are specially used for fabrication of AIE-active polysaccharides with poor organic solubility.
研究领域:
生物材料学
·
分子生物学
·
纳米医学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yizhi Chen,Peng Zhang,Xiaofan Yang,Qiqi Guo,Hanqin Weng,Hanbao Chong,Weiqun Shi,Mingzhang Lin
The stability of organic extractant molecules against radiolysis is critical in the field of actinides and lanthanides (An/Ln) separations. In order to evaluate the radiolytic effects on the extraction performance, the solutions of N,N ’-diethyl- N,N ’-ditolyl-2,9-diamide-1,10-phenanthroline (Et-Tol-DAPhen) in n -octanol were subjected to γ-irradiation in the presence and absence of 3 mol/L HNO 3 aqueous phase. Et-Tol-DAPhen diluted in n -octanol was almost completely decomposed after irradiation and exhibits decreased extraction ability at an absorbed dose of about 384 kGy, along with the appearance of various degradation products. Et-Tol-DAPhen, which was diluted in n -octanol, was completely decomposed upon irradiation in the presence of 3 mol/L HNO 3 aqueous phase. However, it exhibited higher D U and SF U/Eu values than before irradiation, as well as degradation products that were also generated. The structures of some isomers of radiolytic products were investigated by density functional theory (DFT) calculations, the radiolysis pathways and products of Et-Tol-DAPhen extractants were obtained, and the radiolysis pathways and products of Et-Tol-DAPhen extractants was proposed. The radiolytic products mainly originated from amide bond and N C bond cleavage of side group substituents, and some resulted from interaction with n -octanol radicals generated during radiolysis. The presence of HNO 3 can inhibit the radiolysis of Et-Tol-DAPhen to a certain extent and cause enhanced extraction ability. Moreover, the DFT calculations reveal that the radiolytic products produced in presence of 3 mol/L HNO 3 aqueous phase also have efficient extraction performance towards UO 2 2+ . The understanding of the radiolysis pathways and products of extractants, based on radiation chemical effects is expected to be helpful for developing new strategies for extractants with long-term performance.
研究领域:
化学
·
核化学与放射化学
·
分离科学
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产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2015
·Vol. 31
·期 5
·761-765
·
IF 0.875
Sun Weizhi,Yu Shitao,Xian Mo
To investigate the green trinitration method of aromatic compounds, with Lewis acid/ionic liquid as catalyst and HNO 3 /Ac 2 O as nitration reagent, a Lewis acid/ionic liquid/HNO 3 /Ac 2 O system was established. In various combinations of Lewis acids and ionic liquids, Bi(NO 3 ) 3 ·5H 2 O/[HMIM]ClO 4 proved to be a very efficient catalyst for the trinitration of activated aromatic compounds and reusable for 3 times. Reaction conditions for the trinitration were optimized and yields of the trinitro products were from mild to excellent. This sulfuric acid-free system has the advantages of strong trinitration ability, low environment pollution, low toxicity, low cost and high potential for industrial application.
研究领域:
有机化学
·
环境化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）