APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Yan Wu,Tao Liu,Bin Ji,Wei Wang
Iron-cobalt alloy is a potential and economical magnetostrictive material, however, our microscopic understanding of the co-electrodeposition process of Fe-Co alloys is still unsatisfactory. In this work, a flat Fe-Co film with 10 μm was successfully prepared by electrodeposition with a non-toxic sulfate solution. The effects of (NH 4 ) 2 SO 4 , an important additive, were studied and DFT calculation was used to analyze the mechanism of (NH 4 ) 2 SO 4 . EIS shows that (NH 4 ) 2 SO 4 can promote the Fe-Co co-deposition process and obviously inhibits the hydrogen evolution reaction. In addition, (NH 4 ) 2 SO 4 can significantly reduce the internal stress of the Fe-Co film by 110,000 MPa, so that the cracks caused by the internal stress are obviously removed. The results of quantum chemistry calculation further show that NH 4 + is more inclined to adsorb on Fe-Co surface than H 2 O and H + , which reduces the hydrogen evolution on the electrode surface. The results are beneficial to improve the Fe-Co co-deposition process, reduce the internal stress and to prepare a high-performance Fe-Co magnetic film. The films will be assembled on the electronic devices with sensors.
研究领域:
材料科学
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电化学
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表面化学
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量子化学
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高影响因子
Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Congcong Piao,Yitong Lin,Zhiyu Liu,Liang Chen,Jianhe Tang,Dawei Fang,Jun Wang
ABSTRACT Several novel Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalysts are prepared via chemical reduction and calcination methods to degrade organic dyes containing N and S and convert NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 . Sodium borohydride (NaBH 4 ), ascorbic acid (C 6 H 8 O 6 ) and hydrazine hydrate (N 2 H 4 ·H 2 O) are selected as reductants to deposit CuPd alloy nanoparticles on corresponding photocatalyst. The influence of solar light irradiation time on photocatalytic degradation of organic dye and conversion of the generated inorganic ions is studied. The reusability and stability of the prepared photocatalysts are assessed. The results indicate that the Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst prepared by using NaBH 4 has best photocatalytic activity, reusability and stability. The capture experiment of active species proves that holes play crucial roles in photocatalytic degradation of organic dyes and conversion of SO 3 2- and electrons are momentous for the conversions of NO 2 - and NO 3 - . A possible mechanism on photocatalytic degradation of organic dyes containing N and S and conversions of NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 caused by Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst is proposed.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Yanrong Cheng,Xia Guo,Delan Ge,Wenlin Xu,Yaqiong Wang
Broadening the polarity range of polymer-based aqueous two-phase systems (ATPSs) is of practical significance. Recently, ionic liquids have been used as adjuvants to modify the polarity and properties of PEG-rich phases in PEG/salt ATPSs. However, thus far, only short alkyl (containing less than 8 carbon atoms)-chained ionic liquids have been able to promote the extraction performance of ATPSs; long alkyl-chained ionic liquids have decreased the extraction performance significantly due to their distribution in the bottom phase. In the present study, we found that by complexing with Triton X-100 (TX-100), long alkyl-chained imidazolium ionic liquids [C n mim]Br (n = 10 and 12) as adjuvants were enriched in the top phase of PEG/salt ATPSs, and hence, the polarity difference of the two phases were increased. By extracting two model substances (S-mandelic acid (MA) and l -tryptophan (Trp)), it was concluded that, although the long alkyl-chained [C n mim]Br adjuvant decreased the extraction performance of the ATPS substantially, the long alkyl-chained [C n mim]Br/TX-100 complex as the adjuvant enhanced the extraction performance of the ATPS significantly. Compared with the case without an adjuvant, when the [C 12 mim]Br/TX-100 complex and the [C 10 mim]Br/TX-100 complex were used as the adjuvants, the partition coefficients of MA and Trp in the PEG 600/(NH 4 ) 2 SO 4 ATPS were increased up to 3 ∼ 4 times, much better than those with short alkyl-chained ionic liquid as the adjuvant. Moreover, the [C 12 mim]Br/TX-100 complex is more conductive to the transfer of MA into the PEG-rich phase, and the [C 10 mim]Br/TX-100 complex is more conductive to the transfer of Trp into the PEG-rich phase.
研究领域:
生物化学
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分离科学
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工业化学
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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
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Ying Quan,Qinfu Liu,Kuo Li,Hao Zhang,Liang Yuan
Due to the fine granularity of CG with the dissemination of non-graphite minerals, highly efficient purification of natural coaly graphite (CG) by low-cost, low-energy consumption and low-pollution methods remains a challenge. In this study, a novel and efficient electrochemical method is demonstrated for purifying natural CG. The electrochemical purification is carried out in a mixed electrolyte containing 0.5 M (NH 4 ) 2 SO 4 and 10% HF with an optimum potential sequence starting at + 2.5 V for a few minutes followed by a short burst of + 5 V. The CG purification mechanism is proposed based on the experimental results. There are three main factors, namely, the type of the graphite anode, the electrolyte and the applied voltage are critical for effectively electrochemical purification. It is interesting to find that the main purified products are graphene mixed with graphite aggregates at a yield of 68%. Raman analysis indicates that the purified CG has fewer structural defects than the natural CG after removing the non-graphite minerals. Moreover, the XPS and FTIR analysis demonstrate that no other functional groups are grafted onto the parent graphite during this purification process. In comparison with the electrolyte only containing HF, the adding of 0.5 M (NH 4 ) 2 SO 4 in the HF electrolyte could reduce the amount of HF by more than 50%, which cuts the cost and alleviates the impact on the environment.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
Journal of Applied Spectroscopy
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2014
·Vol. 81
·期 5
·807-811
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IF 0.514
Liu Y.,Fan J.,Ma W.,Fu Ch.
An aqueous two-phase system of acetone and (NH 4 ) 2 SO 4 mixture has been developed for the extractive separation of copper (Cu). The complex formed by Cu(II) and Nuclear Fast Red was found to be extracted into the acetone-rich upper phase, and the absorbance of the complex was determined at 465 nm. Beer’s law was obeyed over the concentration range of ~0.6–3.2 mg/l for Cu(II) with a good linearity. The proposed method has been applied to the separation and determination of Cu(II) in seafood samples with a coefficient of variation less than 2.8%. The recovery obtained was ~96.3–101.7%.
研究领域:
分析化学
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环境化学
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食品安全检测
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DOI
高影响因子
MINERALS ENGINEERING
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2019
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IF 3.315
Peilun Shen,Dianwen Liu,Xiaolin Zhang,Xiaodong Jia,Kaiwei Song,Dan Liu
Malachite is depressed during sulfidization flotation when excess sodium sulfide is added to it. Thus, this study investigated the role and mechanism of ammonium sulfate as a sulfidization promoter for eliminating the depression of excess S 2− via micro-flotation experiments, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM-EDS), and inductively coupled plasma mass spectrometry (ICP-MS). Micro-flotation experiments revealed that malachite changed from a non-floating state to an easily floating state by (NH 4 ) 2 SO 4 addition prior to sulfidization with xanthate as the collector. The solution chemical reactions involving (NH 4 ) 2 SO 4 are the key to re-floating malachite. The surface properties of malachite were changed by (NH 4 ) 2 SO 4 , and these changes enhanced its flotation behavior. However, (NH 4 ) 2 SO 4 was not adsorbed onto the malachite surface in any form, as confirmed by the XPS analysis. (NH 4 ) 2 SO 4 has a dissolution on the malachite surface, causing lattice imperfections, which, in turn, provided the conditions necessary for subsequent adsorption of Cu(NH 3 ) n 2+ , S 2− (SH − ), and Cu 2+ on the malachite surface. Consequently, a layer or multilayer copper sulfide hydrophobic film formed on the malachite surface. Even the low-activity cylindrical surface of malachite was also covered with a stable copper sulfide film, resulting in improved malachite flotation in the presence of excess Na 2 S.
研究领域:
矿物加工工程
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化学工程
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Mengyao Li,Yi Zhai,Xubin Zhang,Fumin Wang,Guojun Lv,Ahishakiye Rosine,Mengyue Li,Qing Zhang,Yongkui Liu
The preparation of hollow zeolite with a large cavity structure to improve the accessibility to the active sites of catalyst is of great significance. A thin-walled Ti-rich hollow Titanium silicalite-1 (TS-1) Nanobox was synthesized by dissolution-recrystallization using Silicalite-1 (S-1) as the parent zeolite and (NH 4 ) 2 SO 4 as the dual-function crystallization-mediating agent. The wall thickness of the zeolite is about 30 nm, the hollow percentage (the ratio of the cavity area in the middle of the zeolite to the overall area of the zeolite) can reach 0.57, and the Si/Ti ratio is 39.63. The formation mechanism of hollow TS-1 was studied. As the parent zeolite, S-1 is easier to dissolve than TS-1, making it easier for the hollow zeolite to get a complete cavity. When the molar ratio of (NH 4 ) 2 SO 4 /TEOS reaches 0.25, the dissolution rate matches the crystallization rate best, and a perfect hollow structure is obtained. The pH of the initial gel is the key factor for the hollow structure. The catalytic activity and stability were tested by 1-hexene epoxidation. The conversion of 1-hexene using HTS-1#S0.25 as the catalyst is much higher than that using hollow TS-1 prepared by the conventional method as the catalyst. HTS-1#S0.25 remains a high oxidation activity and high selectivity after five recycle experiments. In addition, the type of anion also has a great influence on the reactivity. This method can provide a new idea for the preparation of hollow TS-1.
研究领域:
材料化学
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催化科学
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产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
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2011
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IF 1.908
Xiaohong Zhao,Xueqiao Xie,Yongsheng Yan
Binodal data of poly(propylene glycol) PPG 400 + salt ((NH 4 ) 2 SO 4 , MgSO 4 , and KCl) + H 2 O systems were determined at T = 298.15 K, and binodal data of PPG 400 + KAc + H 2 O system was determined at T = (298.15, 308.15, and 318.15) K. Moreover, the binodal curves were fitted to Merchuk equation, and the tie-lines were fitted to both the Othmer–Tobias and Bancroft equations. The effects of temperature and salts on the binodals and tie-lines of the investigated ATPSs were also studied. Finally, the salting-out ability of salts on the polymer was obtained by fitting the Setschenow-type equation to the tie-line data to derive a salting-out coefficient ( k S ) for each salt. For potassium salts, the relative effectiveness of the anions in inducing the phase segregation in ATPSs follows the Hofmeister series. The relative salting-out effectiveness of the sulfate salts is influenced by complexation of the cations by PPG.
研究领域:
化学工程
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生物技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
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IF 5.8
Xiaoyu Zhao,Shuguang Shen,Jie Wang,Baojia Wang,Yongmei Liu,Jing Li
Using oxygen-rich medium- and low- temperature coal tar pitch enables intrinsic O-doping. • Low-dose (NH 4 ) 2 SO 4 achieves pre-oxidation of the raw materials. • Low-dose KOH activation produces uniform mesopores with 54% carbon yield. • A sequential low-dose strategy achieves synergistic pore-surface control. • MPC-700 achieves a specific capacitance of 367 F g −1 (at 5 A g −1 ). High-performance supercapacitors require electrode materials with suitable pore structures and abundant surface functional groups. Herein, a tandem oxidation-activation strategy is proposed to prepare coal-tar pitch-derived hierarchical porous carbon (MPC-700) rich in quinonyl groups. Low-dose (NH 4 ) 2 SO 4 pre-treatment significantly increases the oxygen content of the precursor, enhances the quinonyl group content in the porous carbon, and improves the pore structure, leading to a higher specific surface area. DFT calculations reveal that quinone-induced carbon vacancies reduce K⁺ adsorption energy, enhancing ion storage kinetics. Benefiting from the synergistic effect of hierarchical pores and quinone groups, MPC-700 achieves a specific capacitance of 367.0 F g −1 in 6 M KOH with excellent cycling stability. This work demonstrates a tandem coupling effect between low-dose modifiers and activators on oxygen-rich coal tar pitch, where pre-oxidation and pre-etching dictate the final pore structure and surface chemistry. This strategy offers a low-cost, green route for preparing porous carbon for energy storage applications. The porous carbon material, characterized by rich defect sites, a abundant quinonyl active functional groups, and a uniform porous structure, delivers outstanding electrochemical performance when employed as a supercapacitor electrode. Download: Download high-res image (437KB) Download: Download full-size image
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DOI
高影响因子
Surfaces and Interfaces
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2026
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IF 6
Huiqin Gao,Li Li,Xingzhong Huang,Zeyu Kang,Minlin Mao,Zhang Lin,Liyuan Chai,Weizhen Liu
Secondary aluminum dross (SAD), a major solid waste in the aluminum industry, possesses a complex composition representing both a valuable resource and a significant environmental challenge. Approximately 30%–40% of its aluminum content consists of inert species (α-Al 2 O 3 and MgAl 2 O 4 ). In this study, a method for the comprehensive extraction of Al from SAD was developed, which achieved 96% extraction efficiency. The process involved a two-step roasting sequence (first with (NH 4 ) 2 SO 4 at 350°C, then with Na 2 CO 3 at 800°C) and subsequent aqueous leaching. Key parameters, including additive dosage, roasting conditions, and leaching variables, were systematically investigated to optimize aluminum recovery. Mechanistic analysis revealed that (NH 4 ) 2 SO 4 destabilizes the Mg–Al bonds within the MgAl 2 O 4 structure, converting Al into the labile Al 2 (SO 4 ) 3 form. Subsequently, Na 2 CO 3 promotes the structural degradation of α-Al 2 O 3 . Consequently, most inert aluminum species in SAD are converted into soluble aluminum salts. This work provides a targeted activation strategy to overcome technical barriers in extracting inert aluminum, thus establishing a feasible route for total Al recovery from SAD.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
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2022
·Vol. 24
·期 11
·1-10
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IF 2.533
Di Jing,Gai Xikun,Jamakanga Ropafadzo,Lou Jie,Zhu Minzhi,Li Yin,Yang Ruiqin,Ma Qingxiang
To investigate the correlation between electrochemical performance and physicochemical properties, three types of 1D WO 3 nanostructures were fabricated by hydrothermal method using K 2 SO 4 , Na 2 SO 4 , and (NH 4 ) 2 SO 4 as capping agents. Hexagonal phase was obtained with the assistant of Na 2 SO 4 and (NH 4 ) 2 SO 4 , while monoclinic phase was developed using K 2 SO 4 as agent. WO 3 nanostructures prepared by (NH 4 ) 2 SO 4 and Na 2 SO 4 exhibited superior specific capacitance (400 F/g and 388 F/g) relative to WO 3 prepared by K 2 SO 4 (259 F/g), suggesting hexagonal phase is more suitable for energy storage. The nanostructures prepared using Na 2 SO 4 exhibited inferior rate performance compared with those obtained by (NH 4 ) 2 SO 4 due to low specific surface area and high crystallinity. The electrochemical performance demonstrated nanostructures prepared by (NH 4 ) 2 SO 4 was surface-controlled whereas those using Na 2 SO 4 and K 2 SO 4 were battery-type material. These findings raise the prospects of developing tungsten oxide for energy storage. Graphical abstract
研究领域:
材料科学
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电化学
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纳米技术
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能源存储
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）