TETRAHEDRON
·
2015
·
IF 2.641
Biquan Xiong,Kui Zeng,Shanshan Zhang,Yongbo Zhou,Chak-Tong Au,Shuang-Feng Yin
A novel copper-catalyzed method for the direct esterification of P(O)–OH compounds using phenols as efficient esterification reagents is illustrated. It is a simple way to generate a broad spectrum of functionalized O -aryl phosphinates , phosphonates , and phosphates from basic starting materials with moderate to excellent yields.
研究领域:
有机化学
·
合成化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yu Yong,Wang Hua,Hu Jianhang,Zhong Dapeng
Tin-bearing middling, a hazardous solid waste produced during beneficiation of tin deposits and tin-bearing tailings, presents a serious environmental pollution risk due to high levels of As. This paper aims to explore an environmentally friendly technology to reduce toxic substances and prepare a high value-added bronze material from tin-bearing middling. The co-process for tin-bearing middling, anthracite , and copper is first proposed at 1073–1123 K. Variables like temperature, amount of added anthracite, and holding time were optimized. Those results showed that 95.56% Sn and 92.79% As were recovered; levels of Fe in the residue reached 73.52 wt%. During roasting, SnO 2 in the tin-bearing middling was initially transformed into SnO(g), then into an Fe–Sn spinel (Fe 3-x Sn x O 4 ) and Ca 2 SnO 4 , and finally a Cu–Sn alloy. Generation of the Fe–Sn spinel came primarily from substitution of Fe 2+ by Sn 2+ , but small amounts of Sn 4+ replaced Fe 3+ in Fe 3 O 4 . Meanwhile, FeAsS and FeAsO 4 were initially transformed into As 4 (g) and then solidified as a Cu–As alloy. Interestingly, the residual As existed as Fe–As alloy, but As leaching levels did not exceed 0.02 mg/L. After initial treatment, the Cu alloy can be prepared for bronze. Meanwhile, subsequent volatilization and solidification of As resulted in a significant reduction of arsenic-bearing waste that minimizes environmental risk.
研究领域:
冶金工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHESIS-STUTTGART
·
2019
·Vol. 51
·期 21
·4048-4065
·
IF 2.867
Rui-Xiang Wang,Zhuang Fang,Guanyinsheng Qiu,Wenlin Xie,Jin-Biao Liu
The copper-catalyzed synthesis of 3-vinylisocoumarin-1-imine is reported. The transformation proceeds smoothly with good yields in THF and the regioselectivity was determined by a O-nucleophilic 6-endo cyclization. Studies on the mechanism indicate that copper trifluoroacetate serves as a Lewis acid, and the use of vinyl-connected 2-alkynylbenzamide is important for this O-nucleophilic 6-endo cyclization.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Wei Xiang,Tao Zhou,Yifan Wang,Mingjie Huang,Xiaohui Wu,Juan Mao,Xiejuan Lu,Beiping Zhang
This study has demonstrated that hydroxylamine (HA) could greatly enhance Cu nanoparticles (nCu) in activating molecular oxygen and significantly elevate the diclofenac (DCF) degradation rate about two orders of magnitude in neutral circumstances. Effects of several important parameters on the DCF degradation such as nCu loading, HA dosage, pH and reaction temperature were investigated in the nCu/HA/O 2 system. Multiple examinations revealed that the reactive Cu(III) species instead of OH• would be predominant in the nCu/HA/O 2 system, despite their similar DCF degradation pathways. Based on a HA-enhanced copper cycle depending on the pristine Cu 0 @Cu(I) (hydro)oxides core-shell structure, the heterogeneous-homogeneous reaction mechanism was proposed. It included solid-liquid interfacial and bulk reactions, e.g. heterogeneous activation of O 2 by Cu(I) to produce H 2 O 2 and homogeneous Cu(I)-catalytic generation of Cu(III) from H 2 O 2 . Further quantitative investigation of the main reactive species in the cycle revealed that the Cu(I) regeneration instead of the O 2 activation would be rate-limited. Besides, nCu could be recycled to effectively degrade DCF in four consecutive cycles in the raw neural nCu/HA/O 2 system. It suggested that the nCu/HA/O 2 system with a more efficient copper cycle would be a good alternative Fenton-like system in treating neutral recalcitrant organic wastewaters.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhiyu Wei,Lu Fan,Aji Egu,Haiyu Fan,Yuhan Liang
CNTs-Cu x O prepared by impregnation was used with KBH 4 to reduce NO 3 – -N as the first step. CNTs-Cu x O was characterized by SEM, EDS-mapping, TEM, XRD and XPS . The NO 3 – -N reduction batch experiment showed that 100% of NO 3 – -N removal efficiency was achieved in < 10 min with the initial pH of 3.0, 5.0 and 7.0, NO 3 – -N concentration of 30 mg(N)/L, CNTs- Cu x O dosage of 3 g/L and KBH 4 concentration of 3 mmol/L. At the initial pH of 9.0, NO 3 – -N was completely removed in 15 min. The main product of the first step reaction was NO 2 – -N, which was accumulated in the solution and rapidly reduced to N 2 by NH 2 SO 3 H as the second step. The reusability of CNTs-Cu x O was evaluated and the experiment result showed that 96% of NO 3 – -N removal efficiency was achieved in 10 min after CNTs-Cu x O was reused for 5 cycles of reaction. Moreover, the Cu 2+ dissolution was kept monitored for the reaction system, and the analysis result showed that there was no Cu 2+ leaching for all cycles of reutilization.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 43
·16755-16763
·
IF 7.367
Kaixi Bi,Quan Xiang,Yiqin Chen,Huimin Shi,Zhiqin Li,Jun Lin,Yongzhe Zhang,Qiang Wan,Guanhua Zhang,Shiqiao Qin,Xueao Zhang,Huigao Duan
We report an electron-beam lithography process to directly fabricate graphene@copper composite patterns without involving metal deposition, lift-off and etching processes using copper naphthenate as a high-resolution negative-tone resist. As a commonly used industrial painting product, copper naphthenate is extremely cheap with a long shelf time but demonstrates an unexpected patterning resolution better than 10 nm. With appropriate annealing under a hydrogen atmosphere, the produced graphene@copper composite patterns show high conductivity of ∼400 S cm−1. X-ray diffraction, conformal Raman spectroscopy and X-ray photoelectron spectroscopy were used to analyze the chemical composition of the final patterns. With the properties of high resolution and high conductivity, the patterned graphene@copper composites could be used as conductive pads and interconnects for graphene electronic devices with ohmic contacts. Compared to common fabrication processes involving metal evaporation and lift-off steps, this pattern-transfer-free fabrication process using copper naphthenate resist is direct and simple but allows comparable device performance in practical device applications.
研究领域:
材料科学
·
纳米技术
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 34
·12332-12338
·
IF 8.307
Chunjie Li,Songliang Liu,You Xu,Tianlun Ren,Yanan Guo,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
The electrochemical reduction of nitrate to ammonia provides a green and delocalized route for ammonia synthesis under ambient conditions, which requires advanced catalysts with high activity and selectivity. In this work, we propose a two-step conversion strategy to construct hierarchical copper nanosheet-based Cu nanotubes using pre-synthesized Cu nanowires as the starting material for the electrocatalytic nitrate reduction reaction (NO3RR). The conversion of Cu nanowires into Cu nanotubes could be realized through chemical oxidation followed by in situ electrochemical reduction, enabling the effective engineering of active sites and thus boosting the electrocatalytic nitrate-to-ammonia capability. Such a controllable reconstruction strategy provides a new avenue for constructing high-performance electrocatalysts for sustainable NH3 synthesis and the elimination of NO3− contamination.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Yanchun Yang,Xiaojiao Kang,Lijian Huang,Daocheng Pan
Alkali metal doping plays a crucial role in fabricating high-performance Cu(In,Ga)(S,Se)2 and Cu2ZnSn(S,Se)4 (CZTSSe) thin film solar cells. In this study, we report the first experimental observation and characterizations of the alloyed LixCu2–xZnSn(S,Se)4 thin films. It is found that Cu+ ions in Cu2ZnSn(S,Se)4 thin films can be substituted with Li+ ions, forming homogeneous LixCu2–xZnSn(S,Se)4 (0 ≤ x ≤ 0.29) alloyed thin films. Consequently, the band gap, conduction band minimum, and valence band maximum of LixCu2–xZnSn(S,Se)4 thin films are profoundly affected by Li/Cu ratios. The band alignment at the LixCu2–xZnSn(S,Se)4/CdS interface can be tuned by changing the Li/Cu ratio. We found that the photovoltaic parameters of the LixCu2–xZnSn(S,Se)4 solar cell devices are strongly influenced by the Li/Cu ratios. Besides, the lattice constant, carrier concentration, and crystal growth of LixCu2–xZnSn(S,Se)4 thin films were studied in detail.
研究领域:
材料科学
·
太阳能技术
·
半导体物理
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Xiaozhen Wang,Yishi Su,Xiaoshu Wang,Kan Liu,Lanting Zhang,Qiubao Ouyang,Di Zhang
Carbon materials reinforced copper matrix composites with excellent mechanical properties, high thermal conductivity (TC) and suitable coefficient of thermal expansion (CTE) are expected to meet the urgent need for the thermal management materials with structural stability and efficient heat dissipation in civil and military fields. In this work, the tungsten-copper (W-Cu) composite coating was deposited on the graphite flakes (GFs) by the impregnation-reduction and ultrasonic-assisted electroless plating. Meanwhile, the W-Cu coated GFs reinforced Cu matrix composites (GFs(W-Cu)/Cu) were also prepared by the vacuum hot-pressing sintering. Based on the microstructure and surface analysis, the interfacial bonding has changed from the simple mechanical connection to the mechanical-metallurgical synergy. As for the three-point bending and uniaxial tensile tests, the largest in-plane, through-plane flexural strength and tensile strength of the GFs(W-Cu)/Cu composite can achieve the values of 189.6 ± 3.8, 172.3 ± 4.2 and 91.9 ± 2.6 MPa, respectively. Among the GFs(W-Cu)/Cu composites, the ultrahigh in-plane TC and lowest through-plane CTE can reach 929.8 ± 5.0 Wm −1 K −1 and 6.3 ± 0.2 ppmK −1 respectively, and the better thermal response rate can be 0.67 °C·s −1 . In conclusion, an effective way to develop the structural and functional integrated carbon-based thermal management materials can be provided.
研究领域:
材料科学
·
热管理材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 35
·13451-13461
·
IF 4.569
Jiahui Chen,Yunming Li,Huangqing Ye,Pengli Zhu,Xian-Zhu Fu,Rong Sun
Prussian blue analogues (PBAs) as a class of metal–organic frameworks demonstrate a promising platform to develop cost-effective high-performance electrocatalysts. However, the construction of delicate micro/nanostructures and controllable doping are still a challenging task for the fabrication of highly efficient copper-based electrocatalysts. Herein, we report a facile synthesis of copper foam supported Cu3P@Co-Cu3P (CH@PBA-P/CF) sub-microwire arrays as an active electrocatalyst for alkaline water splitting. The Co-Cu3P shell derived from the Cu3[Co(CN)6]2 PBA serves as the source of active sites. Co doping and construction of core–shell structures endow the CH@PBA-P/CF electrocatalyst with abundant catalytic sites, enhanced intrinsic activity, and low charge transport resistance. The catalytic electrode integrated with 3D copper foam and 1D sub-microwire arrays is highly conductive and stable, which promotes the charge transport and improves the structural stability. As a consequence, CH@PBA-P/CF shows impressive catalytic performances toward the HER and OER in terms of low overpotentials of 231 and 312 mV at a current density of 50 mA cm−2 in 1 M KOH, respectively. Notably, the water electrolyzer using the CH@PBA-P/CF electrode exhibits better water splitting performance than the one using noble metal-based couples.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Guohui Tang,Haoxiang Wang,Dianwen Liu,Zhao Xie,Peilun Shen,Jinpeng Cai,Jianjun Fang
Azurite is an important oxidized copper mineral, and the traditional sulfidation-xanthate flotation process still fails to achieve ideal results. Organic chelating reagents containing donor atoms such as N, S, and O have demonstrated excellent performance in mineral flotation and copper corrosion inhibitor research. However, such reagents have rarely been applied in azurite flotation studies. This study introduces a novel N/S – containing activator, 2-mercaptopyridine (2-MP), for azurite activation, and investigates its modification mechanism and flotation effects on azurite. Micro-flotation tests show that 2-MP significantly improves azurite's flotation performance. The flotation recovery of azurite in the 2-MP-potassium butyl xanthate system increased substantially from 37.54% to 97.23%. Theoretical studies reveal that 2-MP activates the azurite surface to form a dense product layer containing S/N elements. This S/N – enriched hydrophobic layer facilitates effective xanthate adsorption, thereby enhancing flotation recovery. The activation mechanism is elucidated as follows: The N/S atoms in 2-MP interact with copper sites on the azurite surface, forming 2-MP-Cu complexes containing S-Cu and N-Cu bonds that adsorb onto the mineral surface, exposing more copper sites. Simultaneously, Cu(II) is reduced to highly active Cu(I), providing a fresh active surface that greatly promotes xanthate adsorption while improving the mineral's hydrophobicity and floatability. This work reveals the surface modification mechanism of the bidentate organic chelating reagent 2-MP on azurite, offering a new approach for the efficient utilization of oxidized copper mineral resources.
研究领域:
矿物加工工程
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shouxin Zhu,Can Sun,Zijie Fang,Mingli Qin,Zhexiao Zhu,Jingyi Qu,Hui Zheng
Facing the escalating issue of antibiotic pollution and the emergence of bacterial resistance in water ecosystems, photocatalytic technology has been widely studied as one of the efficient methods to remove antibiotics in aquatic ecosystem. Herein, the bimetallic organic framework materials Cu/Zn-BTC were synthesized with varying proportions of copper and zinc as metal joints and 1,3,5-phthalic acid as organic ligands. Subsequently, the zinc elements within the MOF were eliminated through high pyrolysis to obtain carbon materials derived from Cu/Zn-BTC (referred to as 1.3CZC, 1.4CZC, and 1.5CZC based on the copper-to-zinc ratio). Notably, the presence of different valence copper species facilitated to form type II heterojunction within MOF-derived carbon materials, where internal Cu 0 /Cu + species combined with oxygen vacancies to create localized bands that prolonged the lifetime of photogenerated carriers and enhanced photocatalytic activity. X-ray photoelectron spectroscopy, Brunauer-Emmett-Taylor and other characterization methods were used to analyze the difference in structure and performance of different catalysts. 1.4CZC showed excellent performance, upon exposure to visible light for 30 min, the removal rate of tetracycline significantly increased to an impressive 92.4 %, while extending the exposure time to 60 min further improved the removal rate of ciprofloxacin to approximately 82.6 %. It provides a highly efficient antibiotics removal pathway by MOF-derived carbon materials.
研究领域:
环境科学
·
材料科学
✓ 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）