JOM
·
2025
·
IF 2.3
Che Wenfang,Deng Rongdong,Xiao Shijie,Zhang Jing,Wu Siyuan,Jiao Fen
To address the challenges associated with the agglomeration and encapsulation of chalcopyrite by molybdenite in flotation slurries, which hinder the effective separation of copper and molybdenum, this study investigated the effects of various dispersants on the dispersion behavior of chalcopyrite and molybdenite, along with the underlying mechanisms. Optical microscopy, focused beam reflectance measurements (FBRM), infrared spectroscopy, zeta potential analysis, and other analytical techniques were employed. The results revealed that the dispersion behaviors of chalcopyrite and molybdenite align with the EDLVO theoretical model. At a slurry pH of 12, the dispersant effectively dispersed molybdenite and minimized its agglomeration around chalcopyrite. The dispersive capabilities of the tested dispersants followed the order: sodium carbonate (Na 2 CO 3 ) > sodium hexametaphosphate (SHMP, (NaPO 3 ) 6 ) > sodium silicate (Na 2 O·nSiO 2 ) > ammonium bicarbonate (NH 4 HCO 3 ). Specifically, carbonate ions produced by the hydrolysis of Na2CO3 were chemically adsorbed onto the molybdenite surface, while hexametaphosphate primarily adhered through physical adsorption. This adsorption enhanced the dispersion of molybdenite particles by increasing electrostatic repulsion between them. Mixed ore flotation experiments demonstrated that both Na 2 CO 3 and SHMP significantly reduced the copper grade in the molybdenum concentrate, from 3.95% to 2.69% and 2.67%, respectively.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Qingming Song,Ya Liu,Lingen Zhang,Zhenming Xu
With a huge amount of waste liquid crystal displays (LCDs) generated annually, their proper recycling raises continuous concern to realize pollution control (heavy metal and liquid crystal) and resource recovery (indium). However, due to their multi-metal feature, traditional hydrometallurgy lacks of sufficient selectivity, which makes the recycling route lengthy, costly, and generate more waste. Electrodeposition acts as a promising technique for selective metal extraction from multi-metal system due to its high selectivity and electron as clean reagent. To fully develop its application in metal recovery, stepwise Cu/MoO 2 and In electrodeposition from In-Cu-Mo-Fe waste LCD leachate is explored in depth. Electrochemical behavior analysis shows Cu and MoO 2 can be first electrodeposited for their higher electroreduction potential. Cl - plays a key role in accelerating indium electroreduction kinetics, which largely shortens the extraction time without the sacrifice of current efficiency . This accelerating effect is attributed to the increased concentration of electroactive species or collision frequency . Under optimized condition, 99.41% of indium (> 99% purity) can be electrodeposited within 13 h with high current efficiency. This study provides a cleaner approach for waste LCDs recycling and gives implications for the potential application of electrochemical technique in e-waste recycling.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Hai Yan,Bingqiao Yang,Mengyuan Zeng,Pengliang Huang,Aiping Teng
Molybdenite and chalcopyrite is generally separated through the selective depression of chalcopyrite using potentially toxic depressants such as sodium sulfide and cyanides. In this work, xanthan gum (XG), a polymer polysaccharide, was investigated as a potential molybdenite depressant in copper-molybdenum sulfides separation. Single mineral flotation tests indicated that molybdenite could be effectively depressed by XG, while chalcopyrite was slightly affected. The artificial mixed minerals flotation tests proved that molybdenite and chalcopyrite could be selectively separated with the addition of XG. The adsorption mechanism was studied through zeta potential and infrared spectroscopy measurements. The results revealed that XG mainly adsorbed on molybdenite surfaces other than chalcopyrite. In a word, the experiments results illustrated that XG could be applied as a promising depressant in the selective flotation separation of molybdenite and chalcopyrite, which has the advantage of environment compatibility over conventional copper depressants.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 3
·1127-1134
·
IF 3.591
Wu Jiajin,Jiamin Zhou,Feng Zhu,Hongyong Wang,Gang Xu
The development of efficient and low-cost sustainable electrocatalytic hydrogen precipitation materials is an effective way to support the reduction of fossil fuel use. In recent years, in order to overcome the problem of the poor electrical conductivity of transition metal chalcogenides (TMCs), carbon-based materials and the MXene family have become popular TMC carriers. In this work, Cu2MoS4/Ti3C2Tx-30% materials with a special structure were synthesized for the first time via a simple and friendly solvothermal method. We successfully grew Cu2MoS4in situ on a MXene (Ti3C2Tx) via solvent heating, and Cu2MoS4/Ti3C2Tx-30% was bonded together by electrostatic adsorption to form a special structure. Its overpotential is 103 mV lower than that of pure Cu2MoS4 at a current density of 10 mA cm−2 in an acidic medium (0.5 M H2SO4). At the same time, under the same conditions, the Tafel slope is 37 mV dec−1 lower than that of pure Cu2MoS4. Critically, the heterostructure retains high catalytic activity within 20 h. All of this is attributed to the special structure of Cu2MoS4/Ti3C2Tx-30%, resulting in increased conductivity, electrochemically active surface area (ECSA), and stability. This provides new ideas for future discoveries relating to the synthesis of non-precious transition metal two-dimensional composites.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Wanting Yang,Zhuoyue Lan,Xiong Li,Yunchuan Li
The mechanism by which moraines influence the flotation process in high-altitude porphyry copper-molybdenum deposits was investigated. Micro-flotation experiments and tests using actual ore samples revealed that moraines significantly reduced the recovery and selectivity of copper-molybdenum ores. As the moraine content increased, the entrainment of gangue minerals also rose considerably. However, the addition of sodium silicate effectively mitigated this entrainment. At a sodium silicate dosage of 10 mg/L, copper recovery reached 90.42 % with a grade of 8.93 %, and gangue entrainment was reduced from 7.58 % to 4.01 %. Molybdenum recovery reached 96.56 % with a grade of 12.89 %, and the gangue entrainment rate decreased from 13.30 % to 1.93 %. Measurements of slurry rheology, viscosity, zeta potential, and slime coating tests further clarified that moraines affect the flotation of copper-molybdenum ores through a slime coating effect. At pH 4, moraine particles adhered to chalcopyrite and molybdenite surfaces, hindering effective collector-mineral interaction and reducing flotation efficiency. The addition of sodium silicate effectively mitigated both the mechanical entrainment and slime coating effects, promoting better separation of copper-molybdenum ores from moraines and improving the recovery and selectivity of target minerals. This study elucidates that the detrimental effects of moraine on the flotation of copper-molybdenum ores are predominantly attributed to entrainment and slime-coating phenomena. It further proposes an effective strategy to enhance the flotation efficiency of copper-molybdenum ores under moraine influence by incorporating sodium silicate.
研究领域:
矿物加工工程
·
地质学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Cong Wang,Hongli Wang,Zhili Wang,Xiaoju Li,Yue Chi,Minggang Wang,Dawei Gao,Zhankui Zhao
Ammonia borane (AB) has been identified as one of the most promising candidates for chemical hydrogen storage . However, the practical application of AB for hydrogen production is hindered by the need of efficient and inexpensive catalysts. For the first time, we report that the incorporation of Mo into Cu@Co core-shell structure can significantly improve the catalytic efficiency of hydrogen generation from the hydrolysis of AB. The Cu 0.81 @Mo 0.09 Co 0.10 core-shell catalyst displays high catalytic activity towards the hydrolysis dehydrogenation of AB with a turnover frequency (TOF) value of 49.6 molH 2 mol cat −1 min −1 , which is higher than most of Cu-based catalysts ever reported, and even comparable to those of noble-metal based catalysts. The excellent catalytic performance is attributed to the multi-elements co-deposition effect and electrons transfer effect of Cu, Mo and Co in the tri-metallic core-shell NPs.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Zhen Li,Xianhui Wang,Da Li,Hongbo Zhang,Bochen Zhang
The Mo 2 C@CNTs/Cu-20wt.%Mo composite materials with outstanding mechanical properties and electrical conductivity were prepared via the combination of mechanical wet-mixing, ball-milling and spark plasma sintering technology. By regulating the morphology and content of Mo 2 C decorated on CNTs, the Mo 2 C nanoparticles are anchored on CNTs and well bonded with the matrix, resulting the good interfacial bonding in the composite material. The Cu-20wt.%Mo composite material reinforced by 0.2wt.%Mo 2 C@CNTs exhibits a yield strength of 342.19 MPa and an ultimate tensile strength of 390.37 MPa, which are respectively increased by 23.13 % and 20.34 % as compared to the Cu-20wt.%Mo. Besides, the electrical conductivity of the 0.2wt.%Mo 2 C@CNTs/Cu-20wt.%Mo composite material is also improved by 6.89 %. Furthermore, the strengthening effect of Mo 2 C@CNTs/Cu-20wt.%Mo composite material can be attributed to the contribution of Mo 2 C nanoparticles, which not only enhance the CNTs load transfer strengthening but also promote the dislocation strengthening and Orowan strengthening.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of the Iranian Chemical Society
·
2024
·Vol. 21
·期 12
·2943-2953
·
IF 2.2
Pu Hongmei,Cui Yifan,Wang Haidan,Yu Lijuan,Yang Dezhi,Yang Yaling,Li Hong
Until now, there have been many reports on the regulation of inorganic metal ions on the catalytic activity of nanozymes, but few reports on the regulation of anions (such as NO 2 − ) on enzyme activity. In this work, a copper-molybdenum doped carbon dots (Cu, Mo-CDs) with peroxidase-like (POD) activity was synthesized by simple one-step microwave digestion method. The Cu, Mo-CDs + NO 2 − system can promote 3,3′,5,5′-tetramethylbenzidine (TMB) oxidizing to blue oxidative product (oxTMB) due to the formation of ∙NO 2 free radical. While Hg 2+ was introduced into the system, the POD-like activity of Cu, Mo-CDs + NO 2 − system was inhibited due to the strong interaction and the electron transfer between Cu, Mo-CDs and Hg 2+ . The formation of ∙NO 2 and the electron transfer capability of Cu, Mo-CDs + Hg 2+ were confirmed through ESR spectra and FMN experiments. The bioenzyme-free colorimetric assay based on Cu, Mo-CDs nanozyme is used for detection of NO 2 − and Hg 2+ , showing lower detection limit (LOD) of 1.63 µg/L for NO 2 − , 0.13 µg/L for Hg 2+ , respectively and good recovery from 90.79 to 108.90%. The work paves a new way to design a nanozyme-based colorimetric protocol for traces NO 2 − and Hg 2+ residues in food analysis.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2024
·
IF 2.1
Lei Shan,Wu Jiaxing,Miao Yu,Guo Bao
It is difficult to depress secondary copper sulfide minerals in the separative flotation of copper–molybdenum coexisting ores with a huge NaHS consumption, and causing serious safety and environmental problems. Galvanic interaction between active metallic granular (low consumption depressant; LCD) and secondary copper sulfide mineral particles can induce surface passivation, thereby depressing its floatability and achieving clean and efficient regulation of copper molybdenum separation. The use of 10% LCD was applied at the first stage and 5 kg/t NaHS at the second stage can recover 89.71% of Cu, while only 52.89% of Cu can be recovered for single stage flotation where 20 kg/t NaHS was used without any presence of LCD. To avoid the negative effect of Mg(OH) 2 colloids at higher pH at the second stage, sodium hexametaphosphate (SHMP) was added as a dispersant and Mo recovery could be pulled up to 89.63%.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2018
·
IF 0
De Zhi Wang,Yu Qing Zhang,Bo Hua Duan
In this work, Molybdenum trioxide and conventional copper particles were used as precursors, reduced in hydrogen atmosphere. Then Cu@Mo Powders were successfully synthesized. Effects of reduction temperature on the microstructure of the composite powders and the performance of the intermediate product (molybdenum dioxide) were investigated. Results show that 700°C is the optimal reduction temperature, because Mo is reduced from its oxide and forms a coating layer on the surface of copper particles tightly without serious crack. Mo-20wt.% Cu composite powders where Cu is coated uniformly with continuous molybdenum layer are successfully obtained by co-reduction method.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Fugang Xu,Meijuan Wu,Guangran Ma,Hui Xu,Wenjuan Shang
A new transitional metal sulfide-reduced graphene oxide hybrid Cu x S-MoS 2 -rGO was developed for enhanced electrocatalytic oxidation and amperometric sensing of glucose. The hybrid was prepared by a facile one-pot hydrothermal approach. The component and structure of the hybrid were characterized by SEM, EDS, XPS, XRD, and Raman spectrum. The MoS 2 -rGO forms a three-dimensional (3D) wrinkled porous matrix, and element Cu in the form of Cu x S (x = 1 or 2) is well dispersed in it. The introduction of Cu greatly elevates the catalysis, while MoS 2 plays a key role in forming 3D wrinkled and porous structure, while rGO obviously accelerates the electron transfer. Due to their synergy effect, the hybrid Cu x S-MoS 2 -rGO displays significantly enhanced catalysis towards glucose oxidation (40-fold enhanced oxidation current compared with that of MoS 2 or MoS 2 -rGO or nearly 40% increase than that of Cu x S-rGO). Based on this, a nonenzymatic amperometric sensor for glucose was developed, which shows a wide linear range of 2-6330 μM, a low detection limit of 0.6 μM, a high stability and adequate selectivity. For glucose sensing in human serum, the developed sensor shows recoveries between 97.2% and 101.2%. Such facile and high-yield approach can be used to prepare other multi-transitional metal sulfide hybrid with promising application in electrochemical sensor and electrocatalysis.
研究领域:
生物传感器
·
材料科学
·
电化学分析
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 27
·9337-9344
·
IF 7.059
Aili Wang,Lili Zhao,Hui Liu,Ziqian Zhou,Chengbo Li,Yong Xiang,Weijia Zhou,Feng Hao
The development of low-dimensional non-precious metal catalysts for the hydrogen evolution reaction (HER) is highly desired for clean energy utilization. Herein, we have reported a facile synthesis protocol of Cu–Mo–O (CMO) nanowires and nanosheets on Cu foam (CMOW/CF and CMOS/CF) through a one-step reaction of Cu nanowires with (NH4)6Mo7O24 solution directly under mild conditions. The final product morphology has been tuned by mechanical stirring. The as-synthesized CMOS/CF exhibits a low operating overpotential of 112 mV at a current density of 10 mA cm−2 with a high electrochemical active area of 25.1 mF cm−2 and excellent long-term stability in the 1 M KOH electrolyte. Moreover, by using the CMOS/CF as cathodic and anodic electocatalysts, a two-electrode electrolyzer capable of driving 10 mA cm−2 at a cell voltage of 1.69 V was achieved, along with promising stability. The high performance of the CMOS/CF can be attributed to higher electrochemical area and more Mo catalytic sites induced by mechanical stirring. This work provides a facile method for the synthesis and catalytic site regulation through a simple method of low-dimensional nanomaterials for the HER with relatively high electrochemical active area and catalytic activity.
研究领域:
材料科学
·
能源化学
✓ 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）