ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Weiyang Yuan,Shuzhen Chen,Changlei Qin,Dawid Piotr Hanak,Xu Zhou
CO2 adsorption is an important approach to control the excessive CO2 emission from energy and industrial plants and mitigating the greenhouse effect. As an acknowledged high-temperature adsorbent, Li4SiO4 shows advantages in capturing a large amount of CO2 with a fast reaction rate and excellent cyclic stability. However, its CO2 adsorption capacity would be significantly affected by the flue gas impurities, such as SO2 and O2. The underlying reaction mechanism of such impurities and Li4SiO4 is still unclear. For this reason, this work studied the reaction path and kinetics between Li4SiO4 and SO2 through experiments, thermodynamic calculations, and characterizations. The results showed that Li4SiO4 reacts with SO2 to produce Li2SiO3 and Li2SO4 in the presence of O2 at 500–700 °C and forms Li2SiO3 and Li2SO3 in the absence of O2 at 500–682 °C. Furthermore, this study revealed a very low activation energy of 7.47 kJ/mol for Li4SiO4 sulfation in the presence of O2 in the kinetic-controlled stage, and the value goes up to 249.7 kJ/mol in the diffusion-controlled stage. These results will provide valuable references for the industrial applications of CO2 adsorption by Li4SiO4.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 36
·1-12
·
IF 2.8
Yang Huiyuan,Guo Rongshuo,Jin Linghua,Zhang Ye,Wang Weike
The design and fabrication of transition metal sulfides for supercapacitors have attracted considerable attention in recent years because of their potential for energy storage applications. Conventionally, the synthesis process involved subjecting them to high temperatures and pressures, which can be energy-intensive and environmentally unfriendly. Herein, microcrystalline NiCo 2 S 4 nanorods were prepared under ambient temperature and pressure using a two-step method. The Ni 1/3 Co 2/3 C 2 O 4 nanorods were initially synthesized using the coprecipitation technique, and then the NiCo 2 S 4 nanorods were obtained by sulfurating Ni 1/3 Co 2/3 C 2 O 4 with Na 2 S·9H 2 O under ambient conditions. The NiCo 2 S 4 as a high-performance supercapacitor electrode has been demonstrated. The results exhibited that the prepared NiCo 2 S 4 electrodes have low charge transfer resistance, and a high specific capacitance of 1330.0 F g −1 at a current density of 1.0 A g −1 . Furthermore, a hybrid supercapacitor was assembled using activated carbon (AC) as the anode material and NiCo 2 S 4 nanorods as the cathode material, and the resulting NiCo 2 S 4 //AC device exhibits an impressive energy density of 27.1 Wh kg −1 at a power density of 1.6 kW kg −1 . This work demonstrates a vision for fabricating a microcrystalline NiCo 2 S 4 cathode under ambient temperature and pressure for hybrid supercapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Qiang Zhang,Yongsheng Sun,Guanda Wu,Xinlei Wei,Peng Gao
Chrysocolla is an important refractory copper oxide ore. The sulfidation roasting using pyrite as a sulfidation agent was conducted on the chrysocolla. A copper recovery of 87.31 % was obtained with butyl xanthate. Thermodynamic analysis indicated that the predominant equilibrium product was Cu 2 S. Excessive pyrite dosage resulted in an overproduction of by-products, and a satisfactory equilibrium composition can be obtained at a roasting temperature above 500 °C. The main gas product was SO 2 , with no H 2 S generated. The roasting process involved the dehydration of chrysocolla, forming copper oxides that reacted with S released from pyrite pyrolysis. The sulfidation reaction gradually proceeded from the particle surfaces to the interiors with the gradual S diffusion. Even with satisfactory copper recovery, a significant amount of copper oxides remained within the particles. This was because xanthate primarily adsorbed onto the particle surface, implying that complete copper mineral phase reconstruction may be unnecessary for efficient flotation.
研究领域:
冶金学
·
矿物加工工程
✓ 已验证
DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2024
·Vol. 30
·期 4
·1039-1051
·
IF 3.8
Yujie Yang,Xiaodong Qiao,Xinpeng Fan,Shuangquan Liao,Zhenfan Sun
Zinc oxide (ZnO) is widely used as an activator in the vulcanization process of natural rubber. However, due to its poor compatibility with natural rubber, a large amount of ZnO needs to use, and the unreacted ZnO can precipitate in various ways, posing significant harm to aquatic organisms and microorganisms. Therefore, it is necessary to reduce the dosage of ZnO in order to minimize its environmental impact. In this study, we applied ZIF-8, a zinc-based metal–organic framework, as a vulcanization additive in natural rubber. and it was found that ZIF-8 could promote the rubber vulcanization reaction by adsorbing sulfur, promoting sulfur ring-opening, and providing different ligand interactions of Zn 2+ . Moreover, even at low usage levels of ZIF-8, it effectively reduces the amount of ZnO while simultaneously improving the mechanical properties of the samples. This work provides an effective method to reduce the amount of ZnO without sacrificing the rubber properties and provides a new idea for the application of ZIF-8 in rubber materials. Highlights ZIF-8 enhances properties of natural rubber composites with low ZnO dosages. Revealing the reason why ZIF-8 promotes the vulcanization of natural rubber. Investigation of the effect of ZIF-8 on the vulcanization properties of natural rubber.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Yekai Zhang,Shuai Wang,Hong Zhong,Xin Ma,Zhanfang Cao
Exploring low-cost and high-efficiency OER catalysts is still a challenge. In this paper, self-supporting catalyst-Ni 3 S 2 @FeCrMoS x /NF was prepared using metal organic frameworks as templates. The morphology of the pre-catalyst has been deeply restructured after the sulfidation reaction, which significantly changes the composition and catalytic performance of the catalyst. The overpotential of Ni 3 S 2 @FeCrMoS x /NF is only 144 mV and 241 mV at a current density of 10 and 50 mA cm −2 respectively, the Tafel slope is as low as 45 mV dec −1 . And it can maintain good electrochemical stability at a high current density of 100 mA cm −2 . The outstanding OER performance of Ni 3 S 2 @FeCrMoS x /NF can be attributed to the increase of electrochemical surface area after sulfidation, the synergistic effect among multi-metals and the synergistic effect of polymetallic sulfides generated by sulfidation.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2020
·
IF 5.825
Lei Wang,Haiyan Liu,Yu Fan,Pei Yuan,Deqi Huang,S. Ted Oyama,Tinghai Wang,Xiaojun Bao
In alumina-based catalysts the properties of the alumina support directly influence the structure (size, morphology, orientation, etc.) of the resulting active phase and ultimately determine the performance of the final catalysts. This paper presents a facile and efficient method for γ-Al 2 O 3 to simultaneously expose {111} facets with strong acidity and {110} facets with moderate basicity. It is shown that the metal oxides NiO x and MoO x can be selectively deposited and subsequently sulfided on the respective facets to form a NiS 2 -MoS 2 /Al 2 O 3 catalyst with substantially enhanced activity for thio-etherification reaction. By cooperative action of the active sites on the newly exposed facets, the catalyst is shown to have superior activity over a conventional NiMoS/Al 2 O 3 catalyst in the thio-etherification reaction between ethanethiol and isoamylene (2-methyl-2-butene) to yield ethylamyl thioethers. Our findings show that tuning the physicochemical properties via crystal facet engineering and inducing cooperative catalysis via preferential deposition of active metals open a novel avenue for the rational design and synthesis of high performance catalysts.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2019
·
IF 0.748
DONGJING LIU,WEIGUO ZHOU,JIANG WU
Perovskite LaFeO 3 /ZSM-5 is synthesized via citrate route for H 2 S removal at high temperatures. It shows good thermal stability after heat treatment at 500–700 ∘ C with respect to slight changes in crystallographic phase and textural property. It presents the optimal desulfurization performance at 600 ∘ C with sulfur capacity of 1017 μ mol S/g and products of S, LaS 2 , and Fe 7 S 8 . Sulfidation at 500 ∘ C yields the same products as sulfidation at 600 ∘ C but displays the lowest sulfur capacity of 408 μ mol S/g. Sulfidation at 700 ∘ C produces La 2 O 2 S, Fe 3 S 4 , and unreacted LaFeO 3 . The activation energy of the sulfidation reaction over LaFeO 3 /ZSM-5 is 109.6 kJ/mol.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
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
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Hang Shen,Xiaojie Chen,Botuo Zheng,Huagui Zhang
Biopolymers as abundant, sustainable, and environment-friendly renewable material have been regarded as the best alternative to nondegradable fossil products. However, these biopolymers are often confronted with problems such as high prices, poor mechanical properties, and susceptibility to bacterial erosion. In the current study, inverse vulcanization was adopted to synthesize polymers with multisulfur segments cross-linked by plant-based sorbic acid and non-edible tung oil. The synthesized copolymer exhibited tailorable glass transition temperatures (0.3–24.8 °C) and rheological behaviors with modulus alterable within an order of magnitude. The addition of transesterification catalyst Zn(acac)2 lowered the activation energy of stress relaxation by ∼20 kJ/mol. Thanks to the dynamic reversible S–S bonds, this networked polymer also exhibited regulatable thermal self-healing behaviors. Moreover, in the blending with polylactide (PLA), the reversible dissociation of S–S bonds at high temperature facilitates the dispersion of polysulfides in the PLA matrix, which can be further improved by adding catalyst, adjusting monomer ratios, etc. As a result, the polysulfides not only toughen the PLA but also endow the blends with excellent antibacterial activities attributed to the intrinsic bacteriostatic sorbic acid and sulfur. Used as a modifer for bioplastics to adjust their mechanical properties and functions, polysulfides are expected to have potential applications in medical materials or food packaging fields.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Lipan Qin,Lanxiang Yang,Xiaochen Liu,Ke Li,Jian-Ping Cao,Jin Zhang
As a new material with excellent comprehensive properties, graphene is an excellent reinforcing agent for natural rubber (NR). However, how to improve the interface performance between graphene and NR, and at the same time be practical, is still a great challenge. In this study, nano-sulfur decorated graphene oxide materials (GO-S) were prepared by in-situ loading nano-sulfur on the surface of graphene oxide (GO). Nano-surface cross-link with NR in the vulcanization process, acts as a bridge to anchor GO and NR molecular chains and improve the interface bonding strength of GO and NR. The AFM results show that the interfacial phase thickness of NR-GO-S composites increased from 135 ± 18 nm to 245 ± 28 nm after in-situ loading modification. The tensile strength and tear property of NR-GO-S composites modified by sulfur loading reach 30.3 MPa and 40.0 kN⋅m −1 , respectively, which are 31.1 % and 12.8 % higher than those of NR-GO composite. Nano-sulfur form O–S and C–S covalent bonds with GO, and form more efficient covalent crosslinking networks with NR molecules in the vulcanization process, thus improving the interfacial compatibility between GO and NR and making the load transfer in rubber matrix more effective. This work provides a new idea and method to improve the interface property between rubber and inorganic nanomaterials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2023
·Vol. 18
·期 23
·e202300757
·
IF 4.1
Honglei Zhang,Haibo Zhu,Yingying Zhang,Gaowen Ren,Weiwei Fang,Qiangwen Fan,Zongbo Xie
Graphical An efficient nickel-catalysed sulfonylation of readily available boronic acids, K 2 S 2 O 5 and 2-chlorobenzothiazoles has been successfully developed for the synthesis of structurally diverse (hetero)aryl sulfones without additional bases. A redox-neutral nickel-catalysed sulfonylation for arylsulfone synthesis was developed. (Hetero)aryl boronic acids reacted with potassium metabisulfite (K 2 S 2 O 5 ) and readily available 2-chlorothiazoles in the presence of air-stable Ni(OTf) 2 and 4,4-di- tert -butyl bipyridine (dtbpy) as a commercially available ligand to produce the corresponding 2-sulfonylthiazoles in moderate to excellent yields. This practical protocol tolerates a wide range of substrates including boronic acids and 2-chloro(benzo)thiazoles without additional bases, allowing the direct synthesis of functional arylsulfones.
研究领域:
有机化学
·
合成化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 11
·4544-4552
·
IF 9.8
Zhongkai Guo,Xuewei Jiao,Kailun Wei,Jianqiao Wu,Jun Hu
Dynamic crosslinked biobased vitrimers can be recycled, reprocessed and degraded via bon-exchange reactions. However, the competitive raw materials and tedious preparation process bring challenges for application of these sustainable polymers. In this work, a series of itaconic acid-based vitrimers owning dual-dynamic networks (SV1, SV2, SV3, SV4 and SV5) were prepared by one-pot inverse vulcanization, which resolved these aforementioned issues simultaneously. In these vitrimers: sulfur (S8) and itaconic acid (IA) were selected as the chief constituents that could be obtained from industrial/agricultural byproducts; 1,4-butanediol diglycidyl ether (BDE) was used as a crosslinker to regulate the network performance; 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) was utilized as a catalyst for reducing the reaction temperature to a mild range (130 °C) and accelerating transesterification reactions (TERs). The resultant vitrimers exhibited good solvent resistance and thermal stability. In particular, SV5 maintained usable thermal and mechanical properties, with a tensile strength, Young's modulus, toughness, Td5 and Tg of 6.18 MPa, 108.97 MPa, 1.71 MJ m−3, 212 °C and 19 °C, respectively. Benefitting from the exchange of disulfide bonds and TERs, these vitrimers could experience stress relaxation at 100 °C, and the relaxation time decreased from 531 s to 13 s from SV1 to SV5 as the crosslinker content decreased. Accordingly, they could be physically recycled, repaired, welded and chemically degraded at a mild temperature. This work provides a “green” (yet efficient) strategy to prepare vitrimers in one pot, thereby paving a way to obtaining sustainable polymers from industrial and agricultural byproducts.
研究领域:
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）