JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2025
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IF 1.6
Liu Zuohai,Li Xiang,Liu Daqian,Weng Xuchen,Huang Min,Liu Zhirong
During the tantalum ore smelting process, radioactive substances such as uranium and thorium accumulate in the slag, posing significant environmental risks if not properly treated. The traditional acid leaching method remains suboptimal for extracting these elements from tantalum slag. To address this limitation, this study employed aluminum salt as leaching aid, effectively enhancing uranium and thorium extraction efficiency. This approach offers a novel methodology for recovering uranium and thorium from refractory slag generated after tantalum ore smelting.
研究领域:
环境科学
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核化学
·
冶金工程
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2025
·
IF 4.8
Xiao Du,Tengfei Li,Lumei Wang,Dezhang Ren,Wenhui He,Zhibao Huo
In this paper, an alkali-free route for the conversion of chitin and shrimp shell to acetic acid (AA) using aluminum salts in aqueous media was reported for the first time. The proposed method demonstrated several advantages, including simplicity, effectiveness, and superior environmental and economic benefits compared to previous approaches. Notably, it achieved a significant breakthrough in the yields of AA derived from chitin and shrimp shells. Under the optimal conditions, the yield of AA reached the maximum value of 81.4 %. Combined with theoretical calculation and characterization, a possible transformation mechanism was proposed, and it was proved that the presence of aluminum salts would change the main reaction pathway and participate in the preparation of AA in the form of polymers. This study provided a novel idea for the resource utilization of chitin and waste shell materials into valuable chemicals and also for the treatment of environmental pollution.
研究领域:
生物化学
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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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Yunhua Bai,Xiong-Fei Zhang,Jiali Ma,Mengjiao Yu,Lian Shu,Xiaoli Gu,Jianfeng Yao
Deep eutectic solvents (DESs) demonstrate significant promise in biorefining because of their ability to break down the complex and resistant structure of lignocellulose. In this study, a ternary DES system composed of AlCl 3 ·6H 2 O, formic acid (FA), and water was designed and applied for the pretreatment of poplar sawdust. The presence of AlCl 3 ·6H 2 O and FA provides Lewis and Brønsted acid sites, respectively. The addition of water adjusts the acidity of the DES system, thereby increasing the separation efficiency of the three lignocellulose components. Under optimal conditions, DES (30 wt% water content) pretreatment achieved a high cellulose recovery rate of 91.3 %, with xylose yields and lignin recovery rates of 79.5 % and 90.1 %, respectively. Additionally, the cellulose residue achieved an enzymatic digestion efficiency of 97.9 %. The mass balance results revealed that the pretreatment strategy could utilize 77.6 % of the raw poplar sawdust, confirming that the method is economical and feasible. This DES pretreatment technique presents significant promise for biomass valorization.
研究领域:
生物化学
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可再生资源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Wenyu Wang,Qinyan Yue,Baoyu Gao,Ruihua Li
In this study, the tendency of coagulation performances, floc characteristics and membrane resistances under different pH conditions in coagulation–ultrafiltration hybrid process was investigated by different Al species and chitosan (CS). Results indicated that CS as coagulation aid was independent of aluminum species. Coagulation efficiencies of three Al species (Al a , Al b and Al c ) combined with CS were enhanced comparing with Al species used alone and shown similar variation tendencies during the pH range. The values of floc size and strength/recovery factor were relatively high at pH 6, and the maximum fractal dimension was achieved under alkaline conditions generally due to adsorption sweeping. Al a /Al b /Al c combined with CS contributed to larger flocs, higher recovery factors and smaller fractal dimension values than those without CS. The results of ultrafiltration experiments shown that membrane resistances during alkaline ranges were higher than those of acidic conditions, which indicated membrane fouling was more serious in alkaline range. In addition, the total membrane resistance was decreased significantly by CS addition.
研究领域:
环境科学
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水处理技术
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Zhangzheng Wang,Yunyun Li,Min Hu,Tao Lei,Ziqi Tian,Weiben Yang,Zhen Yang,Nigel J.D. Graham
Hydrophobically-modified chitosan (HC) has emerged as a promising flocculant for trace pharmaceutical removal from surface water. However, the variation in the characteristics of dissolved organic matter (DOM) in different water sources influences the efficacy of HC in removing pharmaceutical compounds. In this work, the flocculation performance of sequentially dosing alum and HC (alum+HC) for the treatment of five water types (three synthetic waters, and samples of two real waters collected from the Yangtze River and the Thames River), having different DOM and five representative pharmaceuticals (initial concentration: 100 ng/L), was assessed by bench-scale jar tests. The DOM characteristics were correlated quantitatively with the removal efficiencies (REs) of the pharmaceuticals. Density functional theory computations were performed to illuminate the interfacial interactions in the flocculation. Alum+HC exhibited a remarkably higher RE of all five pharmaceuticals (maximum RE: 73%-95%) from all waters compared to a conventional coagulant or flocculant (alum or polyacrylamide, respectively). In contrast to using HC alone, alum+HC also achieved a higher RE of pharmaceuticals with nearly half the HC dosage, thereby enhancing the cost-effectiveness of the alum+HC dosing system. Among the different key DOM characteristics, the surface charge and molecular weight of DOM had no evident correlation with RE(pharmaceutical), but the hydrophobic/hydrophilic nature and functional group composition of organic carbon of DOM were strongly correlated: Strongly hydrophobic fractions, with C-C & C=C functional groups (binding pharmaceuticals via hydrophobic association), were beneficial, while hydrophilic fractions with C-OH groups were less effective, for pharmaceutical removal. This work showed the enhanced performance of the alum+HC dosing combination in the removal of different pharmaceutical compounds from different waters, and filled the knowledge gap regarding the performance of hydrophobically-modified flocculants in the treatment of different surface water sources.
研究领域:
环境科学
·
水处理工程
✓ 已验证
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2015
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IF 4.642
Ruihua Li,Baoyu Gao,Shenglei Sun,Qinyan Yue,Meng Li,Xudan Yang,Wuchang Song,Ruibao Jia
In this study, a lignin-based flocculant (LNF) was synthesized by grafting amine groups into alkali lignin containing papermaking sludge. Characterization of LNF, such as FTIR, zeta potential, cationic degree, viscosity, and molecular weight, showed that the product was a cationic polymer with high solubility. LNF was used with aluminum sulfate (AS) and polyaluminum chloride (PAC) in humic acid coagulation to demonstrate its efficiency. Coagulation behavior and floc properties of LNF+PAC and LNF+AS dual-coagulant were comparatively evaluated. Results showed that the coagulation aid effect of LNF was independent of aluminum species. Addition of LNF could enhance humic acid removal efficiency and floc properties including size, strength, and fractal dimension significantly. The effect of solution pH on coagulation processes was also studied. Dual-coagulants showed the same variation trend as that of aluminum-based coagulants but enhanced coagulation performance during the investigative pH range. Flocs formed at pH 9 and pH 5 achieved maximum floc size in AS and PAC coagulation systems, respectively. Fractal dimension was relatively high at pH 7–9 due to the sweeping effect of aluminum hydrolysates. Overall, LNF brought in charge neutralization and absorption bridging effect and played a positive role in coagulation processes.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 62
·39221-39227
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IF 3.108
Songyan Jia,Xinjun He,Zhanwei Xu
Converting saccharides into 5-hydroxymethylfurfural (5-HMF) has attracted more and more research interest under the background of global energy shortage. A lot of effort has been devoted to the conversion of fructose and glucose. However, other underused sugars receive very limited attention, although some of them have considerable reserves in nature as well. In this work, mannose, a major component from hemicellulose, was effectively converted into 5-HMF under mild conditions. AlCl3·6H2O exhibited superior activity among the tested catalysts, achieving a maximum 5-HMF yield of 60% in a dimethyl sulfoxide (DMSO)/water mixed solvent at 130 °C within 45 min. Adding an appropriate amount of water in DMSO could suppress some side reactions while preserving the reactivity of mannose dehydration. Mannose showed a comparable reactivity to fructose in the employed catalytic system. The studied system was also effective in the conversion of di/trisaccharides such as cellobiose and melezitose into 5-HMF. A number of control experiments with different catalysts and additives were conducted to elucidate the preliminary mechanism.
研究领域:
生物化学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）