TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2025
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IF 4.7
Hao-ran XU,Wei-chao HUANG,A.V. RAVINDRA,Duc-lenh PHAN,Thi-quynh-xuan LE,Li-bo ZHANG,Shao-hua YIN
The oxidation characteristics of sulfite and thiosulfate were examined by using thermodynamic calculations and simulated desulfurization solution experiments to investigate their difference. Subsequently, a new multistage oxidation method using oxygen−ammonium persulfate was presented and applied to the oxidation of a real desulfurization solution. The results show that the concentrations of thiosulfate and sulfite in the real desulfurization solution decrease from 48.76 and 61.76 g/L to 2.24 and 0.02 g/L, respectively, and the ammonium sulfate products obtained are white with uniform particles. In addition, compared with ammonium persulfate alone, the multistage oxidation method can reduce the ammonium persulfate addition by 37.56% and treatment cost by 28.13%.
研究领域:
化学工程
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环境科学
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无机化学
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工业化学
✓ 已验证
产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
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2024
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IF 8.7
Haoran Xu,Guang Fu,Duclenh Phan,Liuxin Xiang,Thiquynhxuan Le,Libo Zhang
Ultrasound enhanced evaporating crystallization has been proposed to solve the problems of low crystallization yield and uneven particle size in the evaporating crystallization process of ammonium sulfate solution at atmospheric pressure. The effects of key operating parameters, including the ultrasound power, stirring speed, pH value, and ultrasound time, on the yield of ammonium sulfate product and the duration of solid–liquid transformation time are studied. The results show that the ultrasound crystallization can increase the ammonium sulfate yield by 52.9 %, reduce the solid–liquid transformation time of ammonium sulfate by 10 %, and obtain ammonium sulfate products with higher crystallinity and more uniform particle size. Ultrasound promotes the crystallization of ammonium sulfate by enhancing the transfer of heat in the solution and reducing the supersolubility of the ammonium sulfate solution from 937.5 g/L to 833.33 g/L. This study provides experimental justification for the use of ultrasound in atmospheric evaporative crystallization.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Wei Li,Bangfu Huang,Xinchao Fan,Keying Zhu,Fu Yuan,Yihang Shi,Zhe Shi,Linjing Yang,Kui Zheng
In order to investigate the nucleation thermodynamics and nucleation kinetics of (NH4)2SO4 during cooling crystallization under the synergistic effect of different ratios of NH4F and NH4Cl, the solubility and width of the metastable zone width of (NH4)2SO4 in the mixed solution were determined by gravimetric and laser methods by incorporation of (NH4)2SO4 in a mixture of different ratios of NH4F and NH4Cl in this study. It is demonstrated that the dissolution of (NH4)2SO4 is a heat-absorbing process, that the inhibition of (NH4)2SO4 nucleation by NH4F is much greater, and that the intermediate stabilization zone of (NH4)2SO4 is enlarged with an increase in the cooling rate. Based on the self-consistent Nývlt-like equation and the classical three-dimensional nucleation theory, the nucleation kinetics of (NH4)2SO4 under the synergistic interaction of NH4F and NH4Cl was investigated, and the critical nucleation parameters of (NH4)2SO4 under the synergistic interaction of NH4F and NH4Cl were obtained.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2021
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IF 9.297
Ying Huang,Diyun Chen,Shuqi Chen,Minhua Su,Yongheng Chen,Yixiong pang,Gutha Yuvaraja
Environmental thallium (Tl) and uranium (U) pollution have attracted great research attention. This study developed a stepwise extraction process to separate Tl and U in an aqueous two-phase system (ATPS) based on 15% polyethylene glycol (PEG6,000) and 10% ammonium sulfate with hydrochloric acid and chlorophosphonazo III (CPA III). The effects of PEG molecular weight , temperature, hydrogen peroxide, HCl, pH, CPA III, equilibrium time, ionic strength , and dissolved organic matter (DOM) on Tl and U separation were studied systematically. The results revealed that 10% H 2 O 2 and 3.2 M HCl in the ATPS rapidly yielded a Tl extraction rate of 95.2%, and the separation factor of Tl and U exceeded 2000 in 5 min; 97.8% of U was extracted in an ATPS containing 0.1 mM CPA III at pH 5–6, and the separation factor of U and Tl reached 5000 in 10 min. The increase of Na + and NH 4 + from 0 to 60 mM did not affect U extraction but promoted Tl extraction and separation, whereas K + inhibited Tl and U extraction. Moreover, although DOM inhibited Tl extraction, it promoted U extraction and separation. Mechanism analysis indicated that Tl and U extraction in the ATPS was due to the salting-out effect of different anions and complexing agents in different acidities. Relative to the conventional method of organic solvent extraction for Tl and U, the method developed herein has greater safety, lower cost, and more environmental benefits, which can be function appropriately in seriously contaminated wastewater containing Tl and U.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2022
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IF 3.682
Zexin Liu,Yinchun Hu,Yue Gong,Yizhu Cheng,Hui Yang,Min Kang,Huixiu Ding,Zhipeng Lei,Yan Wei,Di Huang
Hydrogels are widely used in biomedical engineering, which often require matched mechanical properties to meet specific demands. Recently, numerous research studies have contributed to tissue engineering hydrogels by soaking strategies to obtain designed properties. Herein, a strategy to fabricate poly(vinyl alcohol)/poly(acrylic acid)-ammonium sulfate (PVA/PAA-AS) hydrogel by successively soaking an aqueous PAA solution and (NH4)2SO4 solution based on the synergy of multiple hydrogen bonding and Hofmeister effect is reported, which exhibits remarkable comprehensive mechanical properties: rigidity (elastic modulus: 0.7–3.6 MPa), strength at break (tensile stress: 3.2–12.0 MPa; strain 320–650%), and toughness (fracture energy: 4.5–30.0 MJ m−3). Besides, PVA/PAA-AS hydrogel with unique spring-like microstructure exhibited super-resilience in 30% strain range by energy-transforming mechanism. Compared with pure PVA hydrogel, PVA/PAA-AS hydrogel has the equal excellent cytocompatibility. Therefore, PVA/PAA-AS hydrogel with high strength, modulus, toughness, super-resilience and excellent biocompatibility has potential applications in the soft tissue engineering field such as muscles, tendons, and ligaments.
研究领域:
生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2012
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IF 1.693
Yuan-Yuan Che,Jian Shen,Jun-Chao Zhou,Chao-Hong He
The thermal conductivity of ammonium sulfate + water, ammonium nitrate + water, and ammonium sulfate + ammonium nitrate + water is of great significance in the national defense industry and military engineering for manufacturing of various energetic chemicals. The measurements, covering a temperature range from (278.15 to 333.15) K, have been performed by a transient hot-wire technique over a wide range of concentrations. The densities of ternary aqueous solutions of ammonium sulfate + ammonium nitrate are also presented at the same temperature covering different portions of ammonium sulfate and ammonium nitrate. The thermal conductivities of binary aqueous solutions of ammonium salts are correlated by polynomial functions in terms of temperature and weight fraction for the purpose of interpolation. The Aseyev equation in terms of weight fraction is also used to represent the thermal conductivities of ternary mixtures of these compounds. The ideal mixing rule of Young has been successfully applied to correlate the ternary densities of aqueous ammonium sulfate + ammonium nitrate solutions based on relevant binary solution properties. The agreement between the correlation and the experimental data is pretty good.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Shuting Liu,Guorui Liu,Mingxuan Wang,Linjun Qin,Qingyu Guo,Da Li,Lili Yang,Minghui Zheng
The inhibition of organic pollutants in thermal industrial systems, where metal catalysts and organic pollutant precursors coexist, requires mechanistic insights for targeted control. This study elucidates detailed inhibition mechanisms of ammonium sulfate suppresses toxic byproducts in widespread copper-catalyzed reactions from the micro perspectives of organic free radicals through dual pathways: (1) Organic radical regulation: In-situ EPR identified ortho -amino-tetrachlorophenoxy radicals as key intermediates, which resist dimerization into toxic products. The identified radical structure provides direct evidence supporting the proposed molecular mechanisms. (2) Catalyst deactivation: X-ray analysis demonstrated ammonium sulfate's occupation of Cu active sites and reduction of catalytic oxidation states. These findings provide a molecular-level framework for inhibiting pollutants in metal-rich industrial processes.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Mingming Zuo,Tianqing Liu,Jingjing Han,Yuanchun Tang,Feng Yao,Yufeng Yuan,Zhihong Qian
A new series of microcapsules for the fabrication of gel breakers were prepared by in situ polymerization with polypyrrole and glycerol as shell materials and ammonium persulfate as core material. The morphology, shell wall thickness and size distribution of the microcapsules were characterized through transmission electron microscope, scanning electron microscopy, dynamic light scattering and optical microscope. The controlled releases of ammonium persulfate in the microcapsules were studied at different temperatures. The release time and rate were completely controlled by changing the shell wall thicknesses, components and temperature.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Yan Gao,Yunhong Zhang
In recent years, “brown carbon” (BrC), as an important contributor to light absorption and climate forcing as aerosols, has been one of the forefronts in the field of atmospheric research. Aqueous BrC aerosols can be formed through aqueous reactions of methylglyoxal (MG) with nitrogen compounds, such as glycine (Gly) and ammonium sulfate (AS). When exposed to nitrogen compounds for several days, aqueous carbonyl compound MG became absorbent and fluorescent in the ultraviolet and near visible regions, according to UV/Vis and fluorescence spectroscopies. Experiment results showed that optical absorption of two aqueous BrC solutions in the spectral range of 250–480 nm significantly increased with increasing reaction time. After the reactions of MG with Gly and AS, the product absorbance followed the order of MG-Gly>MG-AS. For H 2 O 2 oxidation photolysis, the atmospheric aqueous BrC showed the dynamic nature. Reaction kinetic, effective quantum yields and size distribution studies were conducted in the paper. Fluorescence lifetime values of the two BrC solutions were calculated. LC/MS analysis results clearly indicated that complicated organic compounds were formed in the reactions of MG with Gly and AS.
研究领域:
大气科学
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环境化学
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产品关联
DOI
PubMed
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
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2025
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IF 1.9
Xingchao Fan,Bangfu Huang,Zhe Shi,Linjing Yang,Fu Yuan,Keying Zhu,Daoping Zhan
Aiming at the problems of low crystallization rate and uneven particle size during evaporative crystallization of ammonium sulfate mother liquor (a by-product of ammonia desulfurization of sintered flue gas), this study investigated via orthogonal tests the effects of evaporation temperature, pH, stirring rate, and calcium sulfate addition on crystallization amount, average particle size, and coefficient of variation (C.V.). The results showed: For crystallization amount, the influence degree was evaporation temperature>pH>stirring rate>calcium sulfate addition; for average particle size, it was stirring rate>pH>evaporation temperature>calcium sulfate addition; for C.V. value, it was stirring rate>pH>calcium sulfate addition>evaporation temperature. Crystal morphologies included hexahedral, columnar, lamellar, etc., with aggregation under some conditions. Crystals contained calcium, nitrogen, oxygen, and sulfur elements(Ca, N, O, S); Ca content increased with calcium sulfate addition. Ammonium sulfate crystals' diffraction peaks matched pure ammonium sulfate, with the highest peaks at pH 5.0, 250 rpm stirring, 3500 mg·L −1 calcium sulfate, and 333.15K.
研究领域:
化学工程
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结晶学
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环境工程
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无机化学
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过程优化
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Shuting Liu,Guorui Liu,Mingxuan Wang,Linjun Qin,Qingyu Guo,Da Li,Lili Yang,Minghui Zheng
Organic free radicals are critical intermediates for the generation and inhibition of organic pollutants during industrial processes. Clarifying the free radical mechanism of pollutant inhibition is significant for their efficient control. Ammonium sulfate is intensively used in industrial materials to suppress organic pollutants. In this study, organic free radical intermediate species in metal-catalyzed reactions inhibited by ammonium sulfate were identified using continuous-wave electron paramagnetic resonance (EPR) spectroscopy, providing direct evidence for the free radical mechanisms of organic pollutants inhibition. The transverse (T2) and longitudinal (T1) relaxation time variations catalyzed by different metal catalysts in the presence of ammonium sulfate were compared using pulsed-wave EPR. Consequently, after the addition of ammonium sulfate, the observed increase in T2 suggests that ammonium sulfate leads to radical concentration reduction. A decrease in the T1 relaxation time suggests the enhanced interaction between organic radicals and metals, which is an obstacle to subsequent radical reactions. Therefore, ammonium sulfate dominantly changed the free radical intermediates species, concentrations, and their reactivity, and then inhibited the organic pollutants formations. The inhibition mechanisms of ammonium sulfate on metal-catalyzed pollutants were then proposed combining EPR analysis, X-ray characterization, and high-resolution mass spectrometry screening. As a result, (1) occupying the active sites of metal catalysis and (2) inhibiting free radical intermediates are the two main intrinsic inhibition mechanisms of ammonium sulfate. The findings provide new perspectives on the efficient inhibition of organic pollutants in industrial processes involving various metal catalysts.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
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2025
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IF 6.3
Kun Liu,Tao Wang,Guohua Zhang,Wei Sun,Ye Yang,Mingjin Tang,Xinming Wang,Xinhui Bi
Aqueous-phase reactions between carbonyls and reduced nitrogen compounds play a considerable role in the formation of secondary organic aerosols and brown carbon in the atmosphere. However, the reported reaction rate constants for these reactions have largely been limited to bulk aqueous-phase simulations, which may not accurately represent the real state of atmospheric cloud droplets. We employed an integration of optical tweezers and Raman spectroscopy to manipulate and analyze simulated cloud droplets (size range 8000-10000 nm), comprising a mixture of glyoxal and ammonium sulfate. This approach enabled us to delve into the intricate realm of their reaction kinetics at individual droplet level mimicking cloud droplets. Raman spectroscopy provided high temporal resolution (20 s) measurements of the changes in the amount of nitrogen-containing organics (or NOCs as represented by the C-N bond) within the droplets. The results indicate that the reaction follows first-order kinetics throughout the monitoring over 80-400 minutes. The average reaction rate constant for the formation of NOCs within the single droplet was determined to be (6.77 ± 0.98) × 10 -5 s -1 , up to three orders of magnitude higher than those through the bulk aqueous-phase simulations, especially at lower pH levels. Additionally, the reaction rate constant in single droplet increases with increasing pH, consistent with the trend previously reported for the aqueous-phase simulations. The results highlight the difference of the reaction rate constant between bulk aqueous phase and droplets, which would improve our understanding on the formation and impacts of secondary organic aerosols and brown carbon in atmospheric aqueous phase.
研究领域:
大气科学
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化学动力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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