Combined flotation-oxygen pressure leaching process for treatment of copper smelting slag with a high oxidation rate and its kinetic study.

A process route combining flotation for recovering easily floatable sulfide copper minerals and oxygen pressure acid leaching (OPAL) was employed to comprehensively recover valuable metals (Cu, Mo, Fe, ) from copper smelting slag with a high oxidation degree. The oxidative leaching process selectively dissolved and recovered Cu and Mo while transforming Fe into leach residue, rendering it suitable as a raw material for iron and steel smelting. Under optimal conditions, the leaching recoveries for Cu and Mo reached 96.

Microwave quasi-solid-constructed NiP-NiP-supported Os with unique metal-support interaction for anion-exchange membrane seawater electrolysis.

Highly efficient and corrosion-resistant electrocatalysts for the seawater hydrogen evolution reaction (HER) are crucial for large-scale hydrogen production. Herein, NiP-NiP-supported Os (Os/NiP-NiP) was synthesized within 30 s an ultrafast and simple microwave quasi-solid approach. This fabricated interface improves the electron transfer efficiency, while metal-support interaction (MSI) between Os and NiP-NiP further optimizes the electronic structure, and then significantly expedites the HER process.

Tunable color, optical properties, and energy transfer of Tb-Sm-Yb tri-doped lithium-niobium-tellurite glass for applications in color display devices and WLEDs.

A TeO-NbO-LiO-CaO (TNLC) lithium-niobium-tellurite glass single-doped and co-doped with Tb, Sm, and Yb ions was synthesized a conventional melt-quenching method. The Tb-Sm co-doped TNLC glass could be tuned to emit white light effectively by controlling the ratio of Tb and Sm in the glass. The fluorescence lifetime of the Tb-Sm co-doped TNLC glass indicated the existence of multiple energy transfer channels, including from Tb to Sm ions and the reverse energy transfer from Sm to Tb ions.

Core-shell structured FeO@C hollow nanospheres as a high-performance negative material for potassium-ion batteries.

FeO is considered a promising electrode for potassium-ion batteries (PIBs) applications due to their natural abundance, low cost and high theoretical capacity. However, FeO suffers from capacity decay and sluggish reaction kinetic during the electrochemical process. Herein, the unique core-shell FeO@C featured with hollow nanospheres FeO as core and amorphous carbon layer as protect shell, the optimal framework of FeO@C is proposed to improve the structural stability and promote K charge transport.

Phase engineering of covalent triazine frameworks to enhance photocatalytic hydrogen evolution performance.

Photocatalytic water splitting for hydrogen production has been considered as an effective approach to address the current energy crisis and environmental challenges. Among all materials for such applications, covalent triazine frameworks (CTFs) are regarded as ideal candidates owing to their conjugated structures with rich aromatic nitrogen atoms, which can provide abundant active sites, suitable bandgaps, good structural tunability, and high chemical stability. Although current research studies have shown that the modification of functional groups in CTFs can adjust the band structure and carrier flow characteristics of photocatalysts, leading to improved performance, the impact of the intrinsic structural characteristics of CTFs (, stacking modes, hydrogen bonding) on their photocatalytic performance remains unclear.

Ruthenium clusters decorated on lattice expanded hematite FeO for efficient electrocatalytic alkaline water splitting.

Electrocatalytic water splitting in alkaline media plays an important role in hydrogen production technology. Normally, the catalytic activity of commonly used transition metal oxides usually suffers from unsatisfactory electron conductivity and unfavorable binding strength for transition intermediates. To boost the intrinsic catalytic activity, we propose a rational strategy to construct lattice distorted transition metal oxides decorated with noble-metal nanoclusters.

First investigation of high-performance FeS-based WO asymmetric supercapacitors operating at 1.6 V.

This study presents a comprehensive evaluation of FeS-WO composite electrodes, revealing their exceptional performance for supercapacitor applications. Fabricated a wet-chemical method, the FeS-WO composites demonstrated a high specific capacitance of 558 F g at a current density of 1 A g, showcasing their outstanding charge storage capabilities. The composites achieved an energy density of 89.

Built-in electrophilic/nucleophilic domain of nitrogen-doped carbon nanofiber-confined NiP/NiN nanoparticles for efficient urea-containing water-splitting reactions.

Transferring urea-containing waste water to clean hydrogen energy has received increasing attention, while challenges are still faced in the sluggish catalytic kinetics of urea oxidation. Herein, a novel hybrid catalyst of NiP/NiN embedded in nitrogen-doped carbon nanofiber (NiP/NiN/NCNF) is developed for energy-relevant urea-containing water-splitting reactions. The built-in electrophilic/nucleophilic domain resulting from the electron transfer from NiP to NiN accelerates the formation of high-valent active Ni species and promotes favourable urea molecule adsorption.

Facile synthesis and electrochemical analysis of TiN-based ZnO nanoparticles as promising cathode materials for asymmetric supercapacitors.

In today's energy landscape, the rise of energy crises spurred by rapid industrial expansion demands the development of advanced energy storage systems, especially those leveraging renewable sources independently. Pseudocapacitors, renowned for their high specific capacitance ( ), offer a promising solution. Among them, transition metal nitride-based oxides stand out because of their remarkable conductivity and storage capacity, making them ideal candidates for supercapacitor (SC) cathode materials.

The effect of MnCO on the gain coefficient for the I → I transition of Er ions and near-infrared emission bandwidth flatness of Er/Tm/Yb co-doped barium zinc silicate glasses.

The roles of Mn ions in the MnCO compound, leading to the formation of an Mn-Yb dimer and affecting the gain coefficient for the I → I transition of Er ions and near-infrared (NIR) emission bandwidth flatness of Er/Tm/Yb co-doped in SiO-ZnO-BaO (SZB) barium zinc silicate glasses, were investigated in this work. The composition of all elements from the original raw materials that exist in the host glasses was determined using energy-dispersive X-ray spectroscopy (EDS). Under the excitation of a 980 nm laser diode (LD), the NIR emission of Er/Tm/Yb-co-doped SZB glasses produced a bandwidth of about 430 nm covering the O, E, and C bands.

Facile synthesis of sulfide BiSI as a promising anode material for a lithium-ion battery.

A novel BiSI structure was synthesized using a facile one-pot hydrothermal method and further optimized as an anode material using graphene. The graphene/BiSI composite achieved a high discharge capacity with an initial value of 1126.5 mA h g and a high and stable discharge capacity of 287.

Study of Se/Te-doped CuO as a hole transport material in perovskite solar cells.

Theoretically, cuprous oxide (CuO) is a particularly excellent potential material, for the hole transport layer (HTL) of perovskite solar cells (PSCs). However, the photoelectric conversion efficiency (PCE) of its experimental samples is still not ideal. The main reasons for this include the material, and inherent and interface defects of CuO, but this can be improved by doping.

Optical band gaps and spectroscopy properties of Bi /Eu /Yb co-doped ( = 0, 2, 3; and = 2, 3) zinc calcium silicate glasses.

In this study, the indirect/direct optical band gaps and spectroscopy properties of Bi /Eu /Yb co-doped ( = 0, 2, 3; and = 2, 3) zinc calcium silicate glasses under different excitation wavelengths were investigated. Zinc calcium silicate glasses with the main compositions of SiO-ZnO-CaF-LaF-TiO were prepared by the conventional melting method. EDS analysis was performed to determine the elemental composition existing in the zinc calcium silicate glasses.

Iron-selenide-based titanium dioxide nanocomposites as a novel electrode material for asymmetric supercapacitors operating at 2.3 V.

This study portrays a facile wet-chemical synthesis of FeSe/TiO nanocomposites for the first time for advanced asymmetric supercapacitor (SC) energy storage applications. Two different composites were prepared with varying ratios of TiO (90 and 60%, symbolized as KT-1 and KT-2) and their electrochemical properties were investigated to obtain an optimized performance. The electrochemical properties showed excellent energy storage performance owing to faradaic redox reactions from Fe/Fe while TiO due to Ti/Ti with high reversibility.

A review on adsorption characteristics and influencing mechanism of heavy metals in farmland soil.

The accumulation of heavy metals in soil and crops is considered to be a severe environmental problem due to its various harmful effects on animals and plants. Soil adsorption is an essential characteristic of mud, which is the fundamental reason for soil to have a specific self-purification capacity and environmental capacity for heavy metals. The adsorption of heavy metals by soil reduces the uptake of these pollutants by crops, thereby limiting food contamination.

CO + NH coupling denitration at low temperatures over manganese/activated carbon catalysts.

To explore the mechanism of low-temperature carbon monoxide and ammonia (CO + NH) coupling denitration of manganese/activated carbon (Mn/AC) catalysts, Mn/AC series catalysts were prepared using the impregnation method with AC activated by nitric acid as a precursor and manganese nitrate as a precursor. We characterized the surface morphology, pore structure, active component phase, functional group, and active component valence change law of the Mn/AC catalyst. The denitration rate order with different Mn loadings is 7Mn/AC > 9Mn/AC > 5Mn/AC.

Extraction of alumina from high-alumina fly ash by ammonium sulfate: roasting kinetics and mechanism.

The recycling of aluminum is commonly an important step to achieve the high value-added utilization of fly ash, which is a kind of solid waste generated from coal-fired power plants. In this study, high-alumina fly ash was efficiently activated by ammonium sulfate method and the alumina was efficiently extracted. The effects of roasting temperature, roasting time, and ammonium sulfate/high-alumina fly ash mass ratio on the leaching rate of alumina were fully analyzed, and the roasting kinetics and reaction mechanism in the roasting process were discussed.

A flexible dual-gate hetero-synaptic transistor for spatiotemporal information processing.

Artificial synapses based on electrolyte gated transistors with conductance modulation characteristics have demonstrated their great potential in emulating the memory functions in the human brain for neuromorphic computing. While previous studies are mostly focused on the emulation of the basic memory functions of homo-synapses using single-gate transistors, multi-gate transistors offer opportunities for the mimicry of more complex and advanced memory formation behaviors in biological hetero-synapses. In this work, we demonstrate an artificial hetero-synapse based on a dual-gate electrolyte transistor that can implement spatiotemporal information integration and storage.

Mechanism of Zn salt-induced deactivation of a Cu/activated carbon catalyst for low-temperature denitration CO-SCR.

In the process of industrial flue gas denitration, the presence of heavy metals, especially Zn salts, is known to lead to the deactivation of the denitration catalysts. However, the specific mechanism of the catalyst deactivation remains unclear. In this paper, the mechanism of the ZnCl- and ZnSO-induced deactivation of low-temperature denitration catalysts in the carbon oxide (CO) selective catalytic reduction (CO-SCR) reaction was investigated using a Cu/activated carbon (AC) catalyst, in which HNO/AC was used as the carrier.

Recovery of Zn and Ge from zinc oxide dust by ultrasonic-HO enhanced oxidation leaching.

Zn and Ge were selectively extracted from zinc oxide dust (ZOD) by the ultrasonic-HO (UH) combined oxidation-leaching process. In the leaching process, the effects of the dosage of HO (6-29.5 mL), ultrasonic power, initial acidity (100-200 g L), liquid/solid mass ratio (4-8 : 1), leaching temperature (50-90 °C), and leaching time (30-240 min) on the leaching rates of Zn and Ge were studied.

Influence of cerium doping on Cu-Ni/activated carbon low-temperature CO-SCR denitration catalysts.

In this study, to evaluate the effects of two methods for activation of nitric acid, air thermal oxidation and Ce doping were applied to a Cu-Ni/activated carbon (AC) low-temperature CO-SCR denitration catalyst. The Cu-Ni-Ce/AC catalyst was prepared using the ultrasonic equal volume impregnation method. The physical and chemical structures of Cu-Ni-Ce/AC were studied using scanning electron microscopy, Brunauer-Emmett-Teller analysis, Fourier-transform infrared spectroscopy, X-ray diffractometry, X-ray photoelectron spectroscopy, CO-temperature programmed desorption (TPD) and NO-TPD characterisation techniques.

Novel N,Cl-doped deep eutectic solvents-based carbon dots as a selective fluorescent probe for determination of morphine in food.

In the present study, new N,Cl co-doped carbon dots (N,Cl-CDs) based on deep eutectic solvent (DES) were fabricated by a facile hydrothermal process. This fluorescent probe exhibited a good quantum yield of 14% and was applied for the sensitive and selective quantification of morphine in foods. In addition, the influence of solution pH, interaction time, system temperature, interfering substances and analogues on the determination was also investigated.

Preparation and electrochemical properties of a novel porous Ti/Sn-Sb-RuO /β-PbO/MnO anode for zinc electrowinning.

MnO coatings prepared in a sulfate system (S-MnO) and MnO prepared in a nitrate system (N-MnO) were successfully deposited on porous Ti/Sn-Sb-RuO /β-PbO substrates by electrodeposition, and their electrochemical properties were studied in detail. The bath composition plays a very important role in the MnO coating prepared by electrodeposition at a low current density. The results of scanning electron microscopy show that a Ti/Sn-Sb-RuO /β-PbO/MnO electrode has a rough morphology and the unit cell is very good.

Micro-area investigation on electrochemical performance improvement with Co and Mn doping in PbO electrode materials.

PbO-CoO-MnO electrodes, used in the electrowinning industry and in the degradation of organic pollutants, have demonstrated an elevated performance through macroscopic electrochemical measurements. However, few reports have investigated localized electrochemical performance, which plays an indispensable role in determining the essential reasons for the improvement of the modified material. In this study, the causes of the increase in electrochemical reactivity are unveiled from a micro perspective through scanning electrochemical microscopy (SECM), X-ray diffraction (XRD), Raman microscopy (Raman), and X-ray photoelectronic energy spectroscopy (XPS).