HYDROMETALLURGY
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2026
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IF 6.3
Huazhen Cao,Canjiang Li,Junfeng Kong,Lining Yu,Anyang Tang,Jingnan Zheng,Zhengzheng Liu,Huibin Zhang,Guoqu Zheng
Zinc vacuum smelting slag contains valuable metals, including gallium (Ga), germanium (Ge), and indium (In). However, their highly dispersed distribution presents significant challenges for efficient recovery. This study developed a sustainable stepwise leaching strategy, combining sulfuric acid (H 2 SO 4 ) leaching with acetic acid (HAc) leaching, for the efficient recovery of Ga, Ge, and In from refractory zinc vacuum smelting slag. The complex occurrence states of Ga, Ge, and In in the slag and their transformation behaviors during leaching behaviors were systematically investigated. During H 2 SO 4 leaching, zinc (Zn) recovery reached up to 96.3% under optimal conditions, while the valuable metals (Ga, Ge, and In) became enriched in the H 2 SO 4 post-leach residues. The enrichment mechanism of Ga, Ge, and In in the post-leach residues was elucidated and found to involve hydrolysis and replacement processes. Subsequently, the H 2 SO 4 post-leach residues were treated with HAc to recover Ga, Ge, and In, achieving recoveries of 83.3%, 91.2%, and 91.4%, respectively. Through a cyclic leaching process (five cycles), the concentrations of Ga, Ge, and In in solution were increased to 0.72 g/L, 5.14 g/L, and 2.71 g/L, respectively. This green and efficient process offers a technically feasible and environmentally benign strategy for recovering valuable metals from secondary resources, thereby promoting resource circularity and waste valorization in the zinc industry.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Zhiheng Wu,Gongkai Zhang,Xuantong Zuo,Hao Ba,Yuran Yu,Yonglong Shen,Guosheng Shao
Metal-free graphene-based electrochemical catalysts are regarded as promising alternatives to precious-metal catalysts for catalyzing both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in rechargeable aqueous Zinc–air batteries. Doping is the most common method for metal-free catalysts to tune their electronic properties and surficial structures, albeit having achieved yet inadequate catalytic activity and stability. Herein, we have formulated an architecture to construct nano-heterojunctions between few-layer phosphorene (P_ene) and the N and P co-doped vertical graphene (NPVG) films, thus enhancing interfacial interaction to stabilize P_ene and achieving remarkable catalytic activities for both ORR and OER with the islands of NPVG/P_ene nano-heterojunctions tuning surficial valence electron distribution in NPVG to significantly lower OER barrier without compromising ORR barrier. Ultimately, the NPVG/P_ene based Zn–air battery exhibited exceptionally high peak power density of 246.4 mW cm −2 plus outstanding cycling stability over 500 h at the charge-discharge current density of 10 mA cm −2 , which drastically outperform the benchmark catalyst (Pt/C and RuO 2 ) based battery cells for three times of peak power density and eleven times of cycling stability. This work provides an attractive and sustainable route with nano-heterojunctions peppering on co-doped graphene as effective bifunctional ORR-OER catalysts essential to resilient Zn-air batteries and alkali fuel cells.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
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IF 5.4
Keying Tang,Yilong Fan,Yi Han,Zhifan Zhao,Dianchun Ju,Chunyu Chen
A flower-like MgAlZn layered double oxide/zinc oxide composite (MgAlZn-LDO@ZnO) was prepared through the thermal conversion of a Zn-regulated MgAlZn layered double hydroxide (MgAlZn-LDH) precursor and subsequent coupling with ZnO obtained by a deep eutectic solvent (DES)-assisted route. Different from conventional LDH/LDO-based composites mainly constructed by direct component combination, this work uses Zn²⁺ as a structural regulator to control the growth and assembly of LDH nanosheets, reduce excessive stacking, and promote the formation of a more dispersed three-dimensional flower-like architecture. After calcination, the hierarchical morphology of the precursor was largely retained, and ZnO was uniformly attached to the surface of MgAlZn-LDO. Compared with MgAl-LDH, the obtained MgAlZn-LDO@ZnO composite showed a larger specific surface area, a more developed pore structure, and improved surface hydrophilicity. Photoelectrochemical results showed that MgAlZn-LDO@ZnO possessed a higher photocurrent response and lower charge-transfer resistance than the corresponding LDH precursor, indicating improved separation and migration of photogenerated charge carriers. Under identical reaction conditions, 95.3% of basic fuchsin (BF) was removed within 50 min by MgAlZn-LDO@ZnO, whereas the removal efficiencies of MgAl-LDH and pure ZnO were 52% and 59%, respectively. Radical trapping experiments showed that ·OH was the dominant active species, while ·O₂⁻ also participated in the photocatalytic oxidation process. DFT calculations indicated that the amino groups and adjacent conjugated regions of BF were more likely to be attacked by reactive species. The enhanced adsorption-assisted photocatalytic removal performance was mainly ascribed to the combined effects of Zn²⁺-regulated structural dispersion, LDO-assisted interfacial enrichment, and ZnO-driven charge separation, which together promoted the adsorption–photocatalytic degradation of BF. Download: Download high-res image (192KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Yiqiong Yang,Yubin Zhang,Juan Han,Shujian Cai,Lun Xiao,Kaiquan Li,Xiaodong Zhang
Although several strategies were developed to activate peroxydisulfate (PDS) through layered double hydroxides (LDHs) for the degradation of organic contaminants, effectively utilizing the structure of LDHs to improve active sites and electron transfer efficiency remained a challenge. The research prepared Ni-Zn-Al LDH-0.1-PDS composite materials through ion exchange. After the PDS intercalated, the efficiency of degradation was significantly improved. The material showed optimal performance at Ni/Zn = 0.1, under the conditions of 1 g/L dosage and 10 mg/L ciprofloxacin (CIP), the degradation rate reached 89.86 % within 120 min. The quenching experiment demonstrated that the reaction was dominated by non-radical pathways represented by e − (80.53 %), h + (70.47 %), and 1 O 2 (58.70 %) and assisted by free radicals denoted as O 2 − (27.84 %). The DFT calculation revealed that the O O bond length increases while the bond energy diminishes upon the incorporation of S 2 O 8 2− into the LDH interlayer, illustrating that PDS existed in a metastable state within the LDH interlayer, where the O O bond exhibited heightened reactivity, facilitating electron acquisition and subsequent cleavage due to the interlayer confinement effect of LDH on anions. This research offered novel insights on altering the composition and structure of LDHs to promote non-radical activation of PDS.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·54556-54567
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IF 5.8
Zhang Ge,Yang Huifen,Li Xuan,Zhou Yichen,Guo Song,Zhao Tong
The control of multiple heavy metals (HMs) pollution in solid wastes, especially the co-contamination of As and other heavy metal cations, is of great importance to ecological and environmental health. To address this problem, the preparation and application of multifunctional materials have attracted wide attention. In this work, a novel Ca-Fe-Si-S composite (CFSS) was applied to stabilize As, Zn, Cu, and Cd in acid arsenic slag (ASS). The CFSS exhibited synchronous stabilization ability for As, Zn, Cu, Cd and owned strong acid neutralization capacity. Under simulated field conditions, the acid rain extracted HMs in ASS successfully decreased below the emission standard (GB 3838–2002-IV category in China) after incubated by 5% CFSS for 90 days. Meanwhile, the application of CFSS promoted the transformation of leachable HMs into less accessible forms, which was conductive to the long-term stabilization for HMs. There was competitive relation among the three heavy metal cations, following the stabilization sequence of Cu > Zn > Cd during incubation. And the stabilization mechanisms of HMs by CFSS were proposed as chemical precipitation, surface complexation, and ion/anion exchange. The research will be greatly conducive to the remediation and governance of field multiple HMs contaminated sites.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 4
·1-10
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IF 2.7
Luo Junsong,Guo Yiming,Liu Lian,Yu Zhou,Zhao Yong,Huang Mei,Xu Min,Duan Xuru,Zhang Yong
Nb 3 (Al 1– x Zn x ) ( x = 0–0.05) wires were obtained after single rapid heating, quenching and low temperature transformation (single-RHQT) process. It is found that Zn element can make crystal plane diffraction peaks of Nb 3 Al phase shift to higher angle, and the interplanar crystal spacing decreases gradually, which indicates that Al atoms in Nb 3 Al lattice are replaced by Zn atoms with smaller diameters. And the addition of Zn can reduce Δ T c and make the superconducting phases purer, and magnetic performances such as critical temperature ( T c ), critical current density ( J c ), irreversible field ( B irr ) are better than that of the pure sample. Nb 3 (Al 0.99 Zn 0.01 ) wire shows the highest J c value of about 5.9 × 10 4 A/cm 2 at 4.2 K and 8 T, and the highest T c value of 16.8 K was found in Nb 3 (Al 0.98 Zn 0.02 ). The influence of multiple rapid heating, quenching and low temperature transformation (multi-RHQT) process on Nb 3 (Al 1– x Zn x ) wires was mainly explored, and 2 at% and 3 at% Zn samples were selected with relatively high Δ T c values for five times RHQT treatment. It is observed that the multi-RHQT process can further reduce Δ T c , and more homogeneous superconducting phases are discovered compared with that of single-RHQT process. The elements are also evenly distributed in the multi-RHQT-processed Nb 3 (Al 1– x Zn x ) wires, leading to the improvement of J c , B irr performances compared to single-RHQT samples. Multi-RHQT-processed Nb 3 (Al 0.98 Zn 0.02 ) and Nb 3 (Al 0.97 Zn 0.03 ) samples show the J c values of 1.7 × 10 5 A/cm 2 and 1.2 × 10 5 A/cm 2 (4.2 K, 8 T), which are nearly ten times as many as that of single-RHQT samples, and Nb 3 (Al 0.97 Zn 0.03 ) has the highest B irr values of 19.6 T (4.2 K) and 10.7 T (10 K). Flux pinning of the Nb 3 (Al 1– x Zn x ) ( x = 0.01–0.05) wires follows the surface pinning mechanism, where grain boundary and stacking faults are considered as pinning centers.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qingshan Zhao,Xiaojie Tan,Tengfei Liu,Shuai Hou,Wanxin Ni,Hao Huang,Jinqiang Zhang,Zhongxue Yang,Dawei Li,Han Hu,Mingbo Wu
Heteroatom-doped carbon materials have been regarded as sustainable alternatives to the noble-metal catalysts for oxygen reduction reaction (ORR), while the catalytic performances still remain unsatisfactory. Herein, we develop a metal-free adjacent N, P and S-codoped hierarchical porous carbon nanoshells (NPS-HPCNs) through a novel layer-by-layer template coating method. The NPS-HPCNs is rationally fabricated by crosslinking of polyethyenemine (PEI) and phytic acid (PA) on nano-SiO 2 template surface and subsequently coating of viscous sulfur-bearing petroleum pitch, followed by pyrolysis and alkaline etching. Soft X-ray absorption near-edge spectroscopy (XANES) analysis and density functional theory (DFT) calculations prove the engineering of adjacent N, P and S atoms to generate synergistic and reinforced active sites for oxygen electrocatalysis. The NPS-HPCNs manifests excellent ORR activity with a half-wave potential (E 1/2 ) of 0.86 V, as well as promoted durability and methanol tolerance in alkaline medium. Remarkably, the NPS-HPCNs-based Zn-air battery delivers an open-circuit voltage of 1.479 V, a considerable peak power density of 206 mW cm −2 and robust cycling stability (over 200 h), even exceeding the commercial Pt/C catalyst. This study offers fundamental insights into the construction and synergistic mechanism of adjacent heteroatoms on carbon substrate, providing advanced metal-free electrocatalysts for Zn-air batteries and other energy conversion and storage devices.
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Chemosensors
·
2022
·Vol. 10
·期 12
·495
·
IF 4.229
Jingyi Si,Wei Zhou,Da Zhou,Ying Fang,Xizhong Shen,Changfeng Zhu
Calprotectin (CP) is an established biomarker that allows the noninvasive evaluation of inflammation levels in the gastrointestinal tract of patients with inflammatory bowel disease and is helpful for the diagnosis and management of the disease. Herein, we demonstrate that CP can effectively suppress the activity of 17E DNAzyme (17E) by chelating Zn(Ⅱ), which is the cofactor of 17E. As the inhibition efficiency of CP on the DNAzyme is proportional to the concentration of CP, the detection of CP can be readily achieved by assessing the activity of 17E.Keywords:DNAzyme;calprotectin;inflammatory bowel disease;fluorescent sensor;metal ion
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shi-Ming Li,Hong-Chan Jiang,Qing-Ling Ni,Liu-Cheng Gui,Xiu-Jian Wang
Ethane (C 2 H 6 ) and ethylene (C 2 H 4 ) have similar physical and chemical properties, which are critical and difficult for the separation of C 2 H 6 /C 2 H 4 mixtures in the petrochemical process. Traditional C 2 H 4 -selective adsorbents can separate the C 2 H 6 /C 2 H 4 mixtures, but need further desorption treatment to obtain pure C 2 H 4 production. On the contrary, high-pure C 2 H 4 can be prepared in one step by C 2 H 6 -selective porous material. Herein, we present a caged metal-organic framework ( GNU-2 ) based on Zn (II) clusters, which has advantageous adsorption sites and cavity pockets for the reverse capture of C 2 H 6 from C 2 H 6 /C 2 H 4 mixtures. At 298 K and 1 bar, high C 2 H 6 uptake (5.10 mmol g −1 ) and C 2 H 6 /C 2 H 4 selectivity (1.849) were attained based on the activated GNU-2 ( GNU-2a ), exceeding a number of top C 2 H 6 -selective adsorbents. Grand canonical Monte Carlo (GCMC) simulations exhibit that the appropriate chemical environment of nonpolar cage in GNU-2a allows it to continuously maintain closer van der Waals contacts between C 2 H 6 molecule, saturated Zn cluster and nonpolar pore surface through multiple C H···O hydrogen interactions and C H···π hydrogen interactions. Moreover, dynamic breakthrough studies also show that GNU-2a displays the actual separation performances of C 2 H 6 .
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Minghui Chen,Chen Wang,Fei Chen,Hongjie Li,Yunpeng Wang,Haitao Ma
A highly sensitive and precise electrochemical biosensor for glucose detection was developed by coupling synergetic catalysis of Cu-Zn-Ni oxide films. To enhance the catalytic performance of alloy, potentials between −0.5 V and 1.5 V are selected for potentiostatic oxidation. Notably, the oxidation process reveals the influence of Cl − in the electrolyte, leading to electrode surface etching, with increasing etching and grain boundary collapse at higher potentials. The electrochemical performance of the electrode was comprehensively evaluated using cyclic voltammetry (CV) and amperometric response in alkaline conditions. The catalytic electrode has an impressive linear response in the concentration range of 0.1 ∼ 1.0 mM glucose, with a sensitivity of 3775.11 μA·mM −1 . Furthermore, the electrode exhibits remarkable stability and anti-interference properties, rendering it suitable for non-enzymatic glucose sensing applications.
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Science Bulletin
·
2023
·
IF 18.9
Canhui Zhang,Xingkun Wang,Zhentao Ma,Hanxu Yao,Hengjun Liu,Cheng Li,Jian Zhou,Ren Xu,Xusheng Zheng,Huanlei Wang,Qiang Li,Meng Gu,Heqing Jiang,Minghua Huang
Breakthrough in developing cost-effective Fe-based catalysts with superior oxygen reduction reaction (ORR) activities and ultra-long-term stability for application in Zn-air batteries (ZABs) remain a priority but still full of challenges. Herein, the neighboring NiN 4 single-metal-atom and Fe 2 N 5 dual-metal-atoms on the N-doped hollow carbon sphere (Fe/Ni-NHCS) were deliberately constructed as the efficient and robust ORR catalyst for ZABs . Both theory calculations and magnetic measurements demonstrate that the introduction of NiN 4 provides a significant role on optimizing the electron spin state of Fe 2 N 5 sites and reducing the energy barrier for the adsorption and conversion of the oxygen-containing intermediates, enabling the Fe/Ni-NHCS with excellent ORR performance and ultralow byproduct HO 2 − yield (0.5%). Impressively, the ZABs driven by Fe/Ni-NHCS exhibit unprecedented long-term rechargeable stability over 1200 h. This work paves a new venue to manipulate the spin state of active sites for simultaneously achieving superior catalytic activities and ultra-long-term stability in energy conversion technologies.
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Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 20
·5335-5346
·
IF 7.779
Jiajia Li,Yunong Qin,Yu Lei,Shifeng Li,Ling Li,Bo Ouyang,Erjun Kan,Wenming Zhang
The structural and compositional modulation of inexpensive hydroxides is not only important, but also an ongoing challenge for the preparation of efficient oxygen evolution reaction (OER) electrocatalysts. Herein, a three-dimensional (3D) structural catalyst (Co-CAT/NiFe-LDH/CNFs) is successfully synthesized by the in situ growth of a conductive metal–organic framework on NiFe layered double hydroxide nanosheets. Density functional theory (DFT) calculations demonstrated that the sluggish kinetics of the OER can be improved by increasing the conductivity and changing the hydrophilicity of the catalyst. Accordingly, the synergistic effect between Co-CAT and NiFe LDH leads to a superior catalytic performance compared to that of Pt/C. In addition, the as-assembled Zn–air battery exhibits excellent stability and a high power density of 327.09 mW cm−2 for 56 h and 112.04 mW cm−2 for 11.5 h in both liquid and solid electrolytes, respectively.
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