Nanomaterials
·
2020
·Vol. 10
·期 1
·178
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IF 4.324
Yanping Wang,Fuchuan Jiang,Jiafu Chen,Xiaofeng Sun,Tao Xian,Hua Yang
Herein, a coprecipitation method used to synthesize CuS nanostructures is reported. By varying the reaction time and temperature, the evolution of the CuS morphology between nanoparticles and nanoflakes was investigated. It was found that CuS easily crystallizes into sphere-/ellipsoid-like nanoparticles within a short reaction time (0.5 h) or at a high reaction temperature (120 °C), whereas CuS nanoflakes are readily formed at a low reaction temperature (20 °C) for a long time (12 h). Photodegradation experiments demonstrate that CuS nanoflakes exhibit a higher photodegradation performance than CuS nanoparticles for removing rhodamine B (RhB) from aqueous solution under simulated sunlight irradiation. Carbon nanotubes (CNTs) were further used to modify the photodegradation performance of a CuS photocatalyst. To achieve this aim, CNTs and CuS were integrated to form CNT/CuS hybrid composites via an in situ coprecipitation method. In the in situ constructed CNT/CuS composites, CuS is preferably formed as nanoparticles, but cannot be crystallized into nanoflakes. Compared to bare CuS, the CNT/CuS composites manifest an obviously enhanced photodegradation of RhB; notably, the 3% CNT/CuS composite with CNT content of 3% showed the highest photodegradation performance (η= 89.4% for 120 min reaction,kapp= 0.01782 min−1). To make a comparison, CuS nanoflakes and CNTs were mechanically mixed in absolute alcohol and then dried to obtain the 3% CNT/CuS-MD composite. It was observed that the 3% CNT/CuS-MD composite exhibited a slightly higher photodegradation performance (η= 92.4%,kapp= 0.0208 min−1) than the 3% CNT/CuS composite, which may be attributed to the fact that CuS maintains the morphology of nanoflakes in the 3% CNT/CuS-MD composite. The underlying enhanced photocatalytic mechanism of the CNT/CuS composites was systematically investigated and discussed.Keywords:CuS nanoparticles/nanoflakes;morphology tailoring;CNT/CuS composites;photodegradation performance
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Dengyu Ying,Yanfen Fang,Huibin Niu,Nannan Du,Mingzhu Chen,Rong Yan,Yingping Huang,Yunzhi Tan,Shaobin Wang
Although metal sulfides have demonstrated exceptional catalytic properties in Fenton-like reactions, little is known about the role of sulfur species in transforming highly active species responsible for degradation organics. CuS (∼12 nm) nano-capsules embedded in the biochar (CuS-BC) were prepared from copper-rich biomass, which could activate H 2 O 2 (4 mM) and completely remove tetracycline (TC) from water within 210 min. Compared with BC/H 2 O 2 /Vis system, the degradation efficiency of TC in the CuS-BC/H 2 O 2 /Vis system was improved by 14.8 times, and the utilization efficiency of H 2 O 2 was improved by 86 times. The whole degradation process of TC can be divided into two stages: quasi-first-order reaction kinetics ( k obs = 0.015 min −1 ) and zero-order reaction kinetics ( k obs = 6.457 mol/L/min). Within 90 min, H 2 O 2 is activated to produce hydroxyl radicals ( OH) by surface Cu 2+ on CuS and photogenerated electrons (e − ) generated from CuS photoexcitation, which react immediately with surface SO 3 2− to form SO 4 − . After 90 min, Cu III -peroxo species ( Cu III -O 2 2− -(SO 3 2− ) n ) formed by electron transfer between Cu I , O 2 , and surface SO 3 2− oxidize the remaining 50 % TC through interface interaction. CuS-BC catalyst exhibits excellent photostability and suitability for actual antibiotic wastewater. Overall, this study offers mechanistic insight into the role of sulfur species in the sulfide-based Fenton reactions.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Peilun Shen,Dianwen Liu,Xiaohui Xu,Xiaodong Jia,Xiaolin Zhang,Kaiwei Song,Jinpeng Cai
In this study, for the first time, we applied ammonium phosphate to pre-treat chrysocolla prior to sulfidization flotation. In addition, we investigated the structural characteristics of the copper sulfide film formed on the chrysocolla surfaces and its response to flotation. Micro-flotation experiments revealed that the addition of (NH 4 ) 3 PO 4 prior to sulfidization greatly improves the floatability of chrysocolla and its recovery increased from 8.71% to 87.97% with butyl xanthate as the collector. The results of the field emission scanning electron microscopy analysis showed that numerous regular fragments appeared on the chrysocolla surfaces after the addition of (NH 4 ) 3 PO 4 . The X-ray diffraction and X-ray photoelectron spectrometry analysis confirmed that these fragments were newly formed copper sulfide covering the chrysocolla surfaces, during this process a chemical reaction occurred in the slurry system, i.e. the Cu 2+ were reduced to Cu + , the S 2− were mainly oxidized to S − , (S 2 ) − , (S 2 ) 2− . The copper sulfide species primarily in the form of crystalline covellite (Cu + 3 (S 2 ) 2− S − ), which is the key to obtaining good flotation recovery. As a specific activator, (NH 4 ) 3 PO 4 participates in the liquid-solid phase chemical reaction between the sulfidizing reagent and the chrysocolla, which promotes the sulfidization reaction of chrysocolla.
研究领域:
矿物加工工程
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材料科学
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DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 4
·774
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IF 4.324
Fang Peng,Yan Sun,Yue Lu,Weiwei Yu,Meiying Ge,Jichao Shi,Rui Cong,Jiaming Hao,Ning Dai
In this work, the high crystalline copper oxide (CuO) nanoparticles were fabricated by a hydrothermal method, and their structural properties were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The sensing results show that CuO nanoparticles exhibit enhanced sensitivity and good selectivity for hydrogen sulfide (H2S) gas at a low temperature. There are two working mechanisms involved in the H2S sensing based on CuO nanoparticle sensors. They are the H2S oxidation mechanism and the copper sulphide (CuS) formation mechanism, respectively. The two sensing mechanisms collectively enhance the sensor’s response in the H2S sensing process. The Cu–S bonding is stable and cannot break spontaneously at a low temperature. Therefore, the CuS formation inhibits the sensor’s recovery process. Such inhibition gradually enhances as the gas concentration increases from 0.2 ppm to 5 ppm, and it becomes weaker as the operating temperature rises from 40 °C to 250 °C. The XPS results confirmed the CuS formation phenomenon, and the micro Raman spectra demonstrated that the formation of CuS bonding and its decomposition can be effectively triggered by a thermal effect. Gas-sensing mechanism analysis supplied abundant cognition for the H2S sensing phenomena based on CuO materials.Keywords:CuO;H2S;mechanism;oxidation;CuS formation
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yuchun Li,Jiachen Liu,Tianle Gong,Changzhi Liang,Lin Li,Xuemei Lin,Zongrong Ying,Huangyan Liu
2D material MXene is one of the most interesting electrode materials due to its vast range of potential applications in electrochemical energy storage and conversion in recent years. Herein we fabricated a novel 2D MXene-based composite electrode material by using hydrothermally synthetized CuS and carbon dots (CDs) to synergistically decorate Ti 3 C 2 T x . The introduction of CuS and CDs increases the interlayer spacing of Ti 3 C 2 T x , which reduces the stacking of Ti 3 C 2 Tx unfavorable to the electrochemical performance. The optimal C-Ti 3 C 2 T x /CuS composite electrode has an excellent specific capacitance of 1186 F·g −1 at a current density of 1 A·g −1 , which is much higher than that of Ti 3 C 2 T x samples decorated with single CuS or with single CDs, illustrating that CuS and CDs have the outstanding synergistic improvement effect to MXene on the electrochemical performance. When the current density rises to 10 A·g −1 , the sample still maintains a capacitance of 907 F·g −1 , corresponding to a capacitance retention rate of 76.5%. After 1000 cycles at a current density of 1 A·g −1 , the capacitance remains 67% of the initial value. These demonstrate that the C-Ti 3 C 2 T x /CuS composite electrode material has a great promising practical potential in fabricating high-performance supercapacitors. The new finding about the outstanding synergistic effect of CDs and transition metal compounds on improving MXene’s electrochemical performance suggests a possible effective way for preparing the high-performance MXene-based electrode materials.
研究领域:
材料科学
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电化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Dong Shu,Lingling Fan,Wei Gong,Dezhan Ye,Zikui Bai,Jie Xu
Utilizing inexhaustible solar energy for water purification represents a green and sustainable solution to water scarcity. However, the developments of efficient, inexpensive, convenient and reliable photothermal materials remain a major challenge. Herein, a facile and versatile preparation strategy of sodium alginate (SA)-CuS composite coating with superior adhesion and stability has been proposed toward high-efficiency solar-driven interfacial evaporation. The fabrication process can be quickly completed in aqueous solution with cheap reagents. The SA-CuS coating can be firmly adhered on different substrates, which can withstand rinsing treatment, iterative freeze-thaw cycles as well as high and low pH environments. The SA-CuS coating can convert various substrates into photothermal materials with broad light absorption for desirable solar evaporation because of high CuS loading and rough surface. As a proof of concept, a wood evaporator covered with the SA-CuS coating can achieve a water evaporation rate of ∼2.2 kg m −2 h - 1 under one sun illumination, which is superior to most reported wood-based solar evaporators.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Nano Research
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2023
·Vol. 16
·期 6
·8497-8503
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IF 9.9
Zou Jian,Wu Zhenrui,Tang Ruilin,Ren Zhenzhen,Niu Xiaobin,Wang Liping
Copper sulfide (CuS) is a promising cathode for lithium-ion batteries (LIBs) due to its impeccable theoretical energy density (∼ 1015 Wh·kg −1 and 4743 Wh·L −1 ). However, it suffers from voltage decay leaded energy density loss and low energy efficiency, which hinders its application. In this work, with combined ex-situlin-situ X-ray diffraction (XRD) and electrochemical analysis, we explore detailed degradation mechanisms. For the voltage decay, it is attributed to a spontaneous reaction between CuS cathode and copper current collector (Cu CC). This reaction leads to energy density loss and active materials degradation (CuS → Cu 1.81 S). As for energy efficiency, CuS undergoes a series of phase transformations. The main phase transition processes are CuS → α -LiCuS → Li 2− x Cu x S + Cu → Li 2 S + Cu for discharge; Li 2 S + Cu → Li 2− x Cu x S → β -LiCuS → CuS for charge. Here, α -LiCuS, β -LiCuS, and Li 2− x Cu x S are newly identified phases. These phase changes are driven by topotactic-reaction-related copper diffusion and rearrangement. This work demonstrates the significance of transition-metal diffusion in the intermediates formation and phase change in conversion-type materials.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Chemistry-An Asian Journal
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2014
·Vol. 9
·期 8
·2309-2316
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IF 3.935
Qun Luo,Yongquan Zeng,Liwei Chen,Changqi Ma
Graphical How does your wurtzite-CZTS grow? The crystal growth mechanism of wurtzite Cu 2 ZnSnS 4 (WZ-CZTS) has been investigated by using time-dependent XRD patterns, TEM images, and absorption spectra analysis. The formation process of WZ-CZTS nanocrystals involves four steps: reduction of Cu 2+ to element Cu, nucleation of Cu 7 S 4 , nucleation and growth of WZ-CZTS on the basal planes of Cu 7 S 4 , and phase transformation from Cu 7 S 4 to WZ-CZTS over about 5 min. en This link goes to a English section zh This link goes to a English section Wurtzite Cu 2 ZnSnS 4 (WZ-CZTS) has been controllably synthesized through a hot-injection route. The crystal-growth mechanism of WZ-CZTS has been investigated by using time-dependent XRD patterns, TEM images, and absorption spectra analysis, and revealed that WZ-CZTS nucleated and grew from monoclinic Cu 7 S 4 nanocrystals through phase transformation of Cu 7 S 4 to WZ-CZTS within 5 min. The synthesis processes are dependent on precursor concentration, reaction temperature, reaction time, organic ligand, and sulfur source and have been studied in detail. It was revealed that the width of the WZ-CZTS nanocrystals was mainly controlled by the precursor concentration, which determines the diameter of Cu 7 S 4 . The length could be regulated by the ratio of dodecanethiol (DDT) to oleylamine (OLA) and reaction time. en This link goes to a English section zh This link goes to a English section 1
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
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2024
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IF 5.7
Sheng Zhang,Junyin Cheng,Bo Song,Shun Linghu,Yijun Tang,Qing Li,Lei Chen
Winter sports have gained popularity in recent years. These sports and activities, however, come with some health concerns, particularly in harsh and extremely cold conditions. A self-heating, flexible, and smart conductive material that can monitor body health in extreme conditions would thus be highly desirable. Inspired by the structure of a spider-web, a flexible pressure sensor was developed by depositing a CNTs/CuS composite coating on a fabric surface with a cellulose-entangled structure constructed by hydroxypropyl methyl cellulose (HPMC). The obtained flexible pressure sensor demonstrated stable physiological signal detection and temperature insensitivity during photothermal heating, attributed to the water-retention capacity of HPMC. In addition, it exhibited excellent electrical conductivity (resistance of 10 Ω cm−1), deicing (181s), sterilization (≈99.99%), UV resistance (UPF ≈ 13 926), environmental adaptability (−78 °C to 50 °C) and high sensitivity (13.25 ± 0.123 kPa−1). This coating process can be applied to various garments, offering new possibilities for designing and preparing wearable multifunctional sensors.
研究领域:
材料科学
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生物医学工程
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智能纺织品
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Rong-Rong Su,Yu-Xiang Yu,Yong-Hao Xiao,XianFeng Yang,Wei-De Zhang
CuSbS 2 is regarded as a promising photo-absorber for solar energy conversion due to its proper bandgap, high absorptivity and earth abundance. Herein, novel low-cost ZnO/CdS/CuSbS 2 core-shell nanowire arrays were constructed as photoanode for hydrogen evolution through non-aqueous electrodeposition and cation exchange. The nanowire demonstrates even and compact multilayer structure. The optimal ZnO/CdS/CuSbS 2 photoanode achieves a photocurrent of 6.48 mA/cm 2 at 0 V versus Ag/AgCl and the remarkable IPCE value with approximately 52% at 480 nm in an electrolyte solution containing 0.35 mol/L Na 2 SO 3 and 0.25 mol/L Na 2 S. It also exhibited a good stability, maintained 87.9% of the initial current after 1 h measurement. The high performance benefits from well-crystalline and compact multilayer structure, high absorptivity of CuSbS 2 and CdS, p-n junction formed between CdS and CuSbS 2 which promotes the electron-hole separation and ZnO nanowire array as three dimensional scaffolds for electron percolation pathway. This work suggests the potential applications of low-cost p-n junction core-shell nanowire arrays as a highly efficient photoanode for hydrogen evolution in oil-field waste water with reductive sulfide.
研究领域:
材料科学
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能源转换
·
光电化学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Zongqi Zhang,Xiaxi Yao,Xiang Liu
Solar-driven water splitting devoid of noble-metal co-catalysts is a promising and cost-efficient strategy for the production of clean and sustainable energy, namely hydrogen. The primary impediment to the practical application of photocatalysts lies in the efficiency of separation of photo-induced charge carriers. Herein, two core–shell ternary nanorod photocatalysts based on ZnO, ZnO@CuS@ZnS and ZnO@ZnS@CuS, were obtained via a facile surface sulfidation strategy. Intriguingly, it was discovered that the performance of hydrogen evolution of these photocatalysts was contingent upon the sequence of sulfidation. Meanwhile, the as-prepared photocatalysts displayed distinct advantages in different aspects. ZnO@CuS@ZnS exhibited a lower activation energy barrier, while ZnO@ZnS@CuS presented a more suppressed electron-hole pairs recombination. The composites exhibited high-efficiency of hydrogen evolution rates, 2.79 µmol·mg −1 ·h −1 (ZnO@CuS@ZnS) and 9.48 µmol·mg −1 ·h −1 (ZnO@ZnS@CuS), along with stable (20 h) performance. This phenomenon has been ascribed to the development of an n-p heterojunction structure, Z-scheme charge transfer mechanism, and the high-performing light-triggered charge separation to relatively extended lifetimes of 5.06 µs and 6.06 µs, respectively. This research may deliver significant understanding of the designation of economical and scalable ZnO-based heterojunction photocatalysts for hydrogen evolution reactions in photocatalysis.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Zhigang Yin,Wei Sun,Yuehua Hu,Chenhu Zhang,Qingjun Guan,Runqing Liu,Pan Chen,MengJie Tian
The flotation response of chalcopyrite and molybdenite when using a novel compound, acetic acid-[(hydrazinylthioxomethyl)thio]-sodium (AHS), as the depressant was investigated through micro-flotation and batch flotation in this study. The depressing mechanisms were studied by means of zeta potential, FTIR and XPS measurements. The micro and bench flotation results indicated that AHS exhibited a strong influence on the depression of chalcopyrite and had little effect on the flotation of molybdenite minerals; these results might be attributed to the significant improvement of the molybdenite/chalcopyrite selectivity index after the addition of AHS. The results of the FTIR spectra, zeta potential and XPS measurements indicated that AHS chemisorbs onto the chalcopyrite surface through its S and N atoms, forming a five-membered cheat ring. A possible depressant mechanism along with a postulated adsorption mode for the surface interaction between AHS and chalcopyrite are provided.
研究领域:
矿物加工工程
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化学工程
✓ 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）