MINERALS ENGINEERING
·
2019
·
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
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACTA OCEANOLOGICA SINICA
·
2014
·Vol. 33
·期 9
·100-108
·
IF 0.684
Kang Xuming,Liu Sumei,Zhang Guoling
Cold diffusion methods are used to separate and quantify the three reduced inorganic sulfur species into acid volatile sulfide (AVS), pyrite-S and element sulfur (ES) in the sediments of the Yellow and East China Seas. The results show that up to 25.02 μmol/g of AVS, 113.1 μmol/g of pyrite-S and 44.4 μmol/g of ES are observed in the sediments of the Yellow Sea and East China Sea. Pyrite-S is the predominant sulfide mineral in the sediments, while the concentration of AVS is quite low at most stations in the study area. The amounts and reactivity of organic matter are the primary limited factor for the sulfide formation, while an iron limitation and a sulfate limitation are not observed in the sediments of the Yellow Sea and East China Sea. The irregular profiles of the three reduced inorganic sulfur species also reflected the comprehensive influence of sediment composition and sedimentation rates.
研究领域:
海洋学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Yanfei Fan,Ziyu Zhuang,Dandan Gao,Dongdong Li,Dewen Zeng
Solid–liquid phase equilibrium data of the Li2SO4 + Rb2SO4 + H2O and Li2SO4 + Cs2SO4 + H2O systems are of importance for the design of alkali metal element extraction processes from sulfate leaching solution of lepidolite. Considering the serious inconsistency of the reported solid phases, especially double salts and solid solutions, phase diagrams of the two systems were reinvestigated experimentally. The results on the Li2SO4 + Rb2SO4 + H2O system at 298.15 K show five solids, i.e., Rb2SO4, Rb2SO4·Li2SO4, Rb2SO4·3Li2SO4·2H2O, Rb2SO4·5Li2SO4·4H2O, and a solid solution with the end members Rb2SO4·5Li2SO4·4H2O and Li2SO4·H2O. For the Li2SO4 + Cs2SO4 + H2O system at 298.15 K, the results also show five solids, i.e., Cs2SO4, Cs2SO4·Li2SO4, Cs2SO4·3Li2SO4·2H2O, Cs2SO4·5Li2SO4·4H2O, and Li2SO4·H2O, while there is no solid solution phase with the end members Cs2SO4·5Li2SO4·4H2O and Li2SO4·H2O. Moreover, the single crystal structures of Rb2SO4·3Li2SO4·2H2O and Cs2SO4·3Li2SO4·2H2O were determined.
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
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 42
·期 10
·1479-1487
·
IF 4.1
Chen Ke-Xiang,Cui Chen-Hui,Li Zhen,Xu Ting,Teng Hao-Qing,He Zhi-Yuan,Guo Yin-Zhou,Ming Xiao-Qing,Ge Zhi-Shen,Zhang Yan-Feng,Wang Tie-Jun
Sulfur-containing dynamic polymers had attracted significant attention due to their unique chemical structures with high reversibility. Utilizating sulfur, an inexpensive industrial waste product, to synthesize dynamic polysulfide polymers through reverse vulcanization has been a notable approach. However, this method required high temperatures and resulted in the release of unpleasant oders. In this study, we presented a robust method for the preparation of sulfur-rich polymers with dynamic polysulfide bonds from elemental sulfur and inexpensive epoxide monomers via a one-pot strategy at the mild room temperature. Different types of polysulfide molecules and polymers were synthesized by reacting various epoxide compounds with sulfur, along with the investigation of their structures and dynamic behaviors. It was noteworthy that the obatined polymers prepared from m -(2,3-epoxypropoxy)- N,N -bis(2,3-epoxypropyl)aniline and elemental sulfur exhibit multiple dynamic behaviors, including polysulfide metathesis and polysulfide-thiol exchange, enabling their rapid stress relaxation, self-healing, reprocessing and degradable properties of the cross-linked polymer. More importantly, the hydroxyl groups at the side chains from epoxide ring opening exhibited potential transesterification. This work provided a facile strategy for designing dynamic sulfur-rich polymers via a mild synthesis route.
研究领域:
材料科学
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聚合物化学
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可持续化学
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DOI
高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-9
·
IF 3.998
Meng Xianglong,Zhou Pin,Li Lu,Liu Lizhong,Guo Mingming,Sun Tonghua
The selectivity of a facile reductive and extractive desulfurization process was studied. In this desulfurization method, polyethylene glycol was used as the extractant, and sodium borohydride was used as the reductant. Several different simulated fuels were prepared by dissolving thiophenic sulfides, methylbenzene and hexylene in octane. The results showed that methylbenzene and olefins had different effects on different sulfur compounds during this desulfurization process. The extraction and reduction mechanisms were also explained. Four factors could affect the desulfurization performance: (1) intermolecular hydrogen bonding: (a) active O bonding with aromatic H or (b) S bonding with H atoms in hydroxide radicals, (2) “like-dissolves-like” interactions between polyethylene glycol and thiophenic sulfides, (3) the methyl steric hindrance effect and the electron density of sulfur atoms, and (4) the combination of S atoms with produced nickel boride to form active desulfurization centres. The desulfurization reaction path was also deduced according to the GC/MS results.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Chemical Science
·
2022
·Vol. 13
·期 21
·6224-6232
·
IF 9.969
Rui Xu,Hongan Tang,Yuanyuan Zhou,Fangzheng Wang,Hongrui Wang,Minhua Shao,Cunpu Li,Zidong Wei
The practical application of lithium–sulfur (Li–S) batteries is seriously hindered by severe lithium polysulfide (LiPS) shuttling and sluggish electrochemical conversions. Herein, the Co9S8/MoS2 heterojunction as a model cathode host material is employed to discuss the performance improvement strategy and elucidate the catalytic mechanism. The introduction of sulfur vacancies can harmonize the chemisorption of the heterojunction component. Also, sulfur vacancies induce the generation of radicals, which participate in a liquidus disproportionated reaction to reduce the accumulation of liquid LiPSs. To assess the conversion efficiency from liquid LiPSs to solid Li2S, a new descriptor calculated from basic cyclic voltammetry curves, nucleation transformation ratio, is proposed.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2023
·Vol. 30
·期 3
·677-690
·
IF 4.4
Chen Jun-nan,Xie Feng,Wang Wei,Fu Yan,Wang Jian,Xu Bin
Due to the high toxicity of cyanide, researchers are trying to find an environmentally friendly and sustainable leaching process for precious metals. Thiosulfate is considered one of the most promising alternative leaching systems. Nevertheless, a traditional thiosulfate leaching solution generally consists of copper sulfate and ammonia, in which copper sulfate acts as oxidant and ammonia acts as copper ion stabilizer. However, ammonia is another toxic reagent. For this reason, a novel and eco-friendly system of copper sulfate-tartrate-thiosulfate was investigated for silver sulfide leaching in this work. The effects of rotation speed, temperature, initial pH, copper sulfate, tartrate and thiosulfate concentrations and different atmospheres on the dissolution rate of Ag 2 S were examined. The process of silver sulfide dissolution is controlled by chemical reactions with an apparent activation energy of 43.49 kJ/mol. The reaction orders of silver sulfide leaching with respect to copper sulfate, tartrate, and thiosulfate concentrations in copper sulfate-tartrate-thiosulfate solutions are 0.491, 1.366, and 0.916, respectively. A detailed dissolution route of Ag 2 S was proposed based on XRD analysis of intermediate products such as Ag 3 CuS 2 , AgCuS and (Ag, Cu) 2 S. XPS analysis indicated that elemental sulfur was determined to be the final oxidant product of sulfur ions from Ag 2 S.
研究领域:
冶金工程
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环境化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Youshuang Zhou,JianYun Ding,Zhaoyang Wei,Weiwei Lei,Jun You,Qunchao Zhang,Dean Shi
The catalytic effect of zinc sulfide (ZnS) on the transformation of polysulfides (Li 2 S 8 ) to lithium sulfide (Li 2 S) has been proven by the enhancement in the rate performance of lithium-sulfur (Li–S) batteries incorporating ZnS particles into the cathode. Accordingly, the shuttling effect of polysulfide should also be suppressed. However, the expected phenomenon is not found in the Li–S batteries with ZnS particles being added in the cathodes. In order to find the intrinsic mechanism of this phenomenon, detailed catalytic effects of ZnS particles on different polysulfide molecules are investigated. It is shown that ZnS can only enhance the reaction from Li 2 S 4 to Li 2 S and it has almost no catalytic effect on the reaction from Li 2 S 6 to Li 2 S 4 . This is why the shuttle effect of Li 2 S 6 cannot be effectively prohibited. This mechanism is further verified via combining ZnS particles with S–C@PVA yolk-shell particles containing sulfur (S) and carbon black (C) as the core and PVA as the shell. Although the reaction from Li 2 S 6 to Li 2 S 4 cannot be directly catalysed by ZnS particles, it can still be enhanced when ZnS particles are distributed within the S–C@PVA yolk-shell structure (S–C–ZnS@PVA) because the reaction speed from the Li 2 S 4 to Li 2 S is accelerated. The fast consumption of Li 2 S 4 will result in the enhancement of the reaction from Li 2 S 6 to Li 2 S 4 , which will largely reduce the diffusion of Li 2 S 6 out of the PVA shell. While if ZnS particles are located outside the S–C@PVA yolk-shell structure (S–C@PVA-ZnS), large amount of Li 2 S 6 can still diffuse out of the PVA shell and enter into the electrolyte since the transformation from is Li 2 S 6 to Li 2 S 4 relatively low. Both the rate performance and cycle stability of the batteries with S–C–ZnS@PVA cathodes are higher than those with S–C@PVA-ZnS ones. These results will give a guidance for the preparation of Li–S battery with high performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF FLUORINE CHEMISTRY
·
2024
·
IF 1.7
Ye-lin Liu,Xiao-Yu Geng,Min Jiang,Jin-Tao Liu
The perfluoroalkylthiolation reactions of thiols with perfluoroalkanesulfenic acids were achieved without adding any additives, giving a series of unsymmetric disulfides in good to excellent yields. After simple removal of solvent from reaction system under reduced pressure, most products could be obtained with high purity. The reaction tolerates both aryl and alkyl thiols and has advantages such as easy-to-handle, additive-free and simple separation procedure.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Junhong Lu,Yinjuan Chen,Yanlin Zhang,Jie Huang,Haoyang Jiang,Dafang He,Haiqun Chen
Due to the presence of polysulfide shuttling, serious electrode expansion, and the low electrical conductivity of sulfur materials at room temperature, the commercialization of Li-S batteries is still not feasible. In this study, we have synthesized unique hollow molybdenum disulfide nanocages/reduced graphene oxide (H-MoS 2 /rGO) composites to be employed as highly effective cathodes for Li-S batteries. In this well-designed structure, the hollow MoS 2 nanocages are tightly bound by C-O-Mo bonds and uniformly distributed across the graphene sheets. The dual-function MoS 2 nanocages can adsorb polysulfides by Mo-S bond and accelerate the conversion reaction of S 8 and Li 2 S. Moreover, the 3D rGO network with abundant pores effectively reduces the diffusion path and enhances the rapid transport of electrons and ions. The hybrid H-MoS 2 /rGO cathodes with these advantages exhibit a remarkable initial discharge capacity of 801.7 mAh g -1 at 1 C, as well as a high specific discharge capacity of 533.2 mAh g -1 is remained over 500 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ruixian Duan,Xifei Li,Guiqiang Cao,Qinting Jiang,Jun Li,Liping Chen,Jingjing Wang,Chenyang Hou,Ming Li,Zihao Yang,Xuan Yang,Jiaxuan Zuo,Yukun Xi,Chong Xie,Jing Wang,Wenbin Li,Jiujun Zhang
Heterostructure engineering is considered a crucial strategy to modulate the intrinsic charge transfer behavior of materials, enhance catalytic activity, and optimize sulfur electrochemical processes. However, parsing the role of heterogeneous interface-structure–property relationships in heterostructures is still a key scientific issue to realize the efficient catalytic conversion of polysulfides. Based on this, molybdenum carbide (Mo 2 C) was successfully partial reduced to molybdenum metal (Mo) via a thermal reduction at high-temperature and the typical Mo-Mo 2 C-based Mott-Schottky heterostructures were simultaneously constructed, which realized the modulation of the electronic structure of Mo 2 C and optimized the conversion process of lithium polysulfides (LPS). Compared with single molybdenum carbide, the modulated molybdenum carbide acts as an electron donor with stronger Mo-S bonding strength as well as higher polysulfide adsorption energy, faster Li 2 S conversion kinetics, and greatly facilitates the adsorption → catalysis process of LPS. As a result, yolk-shell Mo-Mo 2 C heterostructure (C@Mo-Mo 2 C) exhibits excellent cycling performance as a sulfur host, with a discharge specific capacity of 488.41 mAh g −1 for C@Mo-Mo 2 C/S at 4 C and present an excellent high-rate cyclic performance accompanied by capacity decay rate of 0.08 % per cycle after 400 cycles at 2 C. Heterostructure-acting Mo 2 C electron distribution modulation engineering may contributes to the understanding of the structure-interface-property interaction law in heterostructures and further enables the efficient modulation of the chemical behavior of sulfur.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
iScience
·
2024
·
IF 4.6
Tianlan Yan,Yingshuai Jia,Kaige Hou,Zhuxin Gui,Wenbiao Zhang,Ke Du,Di Pan,He Li,Yanghao Shi,Lu Qi,Qingsheng Gao,Yahong Zhang,Yi Tang
Hydrodesulfurization (HDS) is a commonly used route for producing clean fuels in modern refinery. Herein, ammonium/amine-intercalated MoS 2 catalysts with various content of 1T phase and S vacancies have been successfully synthesized. Along with the increment of 1T phase and S vacancies of MoS 2 , the initial reaction rate of the HDS of dibenzothiophene (DBT) can be improved from 0.09 to 0.55 μmol·g cat −1 ·s −1 , accounting for a remarkable activity compared to the-state-of-the-art catalysts. In a combinatory study via the activity evaluation and catalysts characterization, we found that the intercalation species of MoS 2 played a key role in generating more 1T phase and S vacancies through the ‘intercalation-deintercalation’ processes, and the hydrogenation and desulfurization of HDS can be significantly promoted by 1T phase and S vacancies on MoS 2 , respectively. This study provides a practically meaningful guidance for developing more advanced HDS catalysts by the intercalated MoS 2 -derived materials with an in-depth understanding of structure-function relationships.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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