Mining Metallurgy & Exploration
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2026
·
IF 2.5
Wang Guangdong,Bai Ziyang,Li Maohui,Mao Xishan,Yu Jie,Su Chang,Hu Wenwen,Ma Bo,Sun Wenzhou,Lu Youjun
In response to the limitations of the traditional acid leaching process in terms of environmental impact and safety, this study developed a ternary mixed acid system (hydrochloric acid - oxalic acid - citric acid) without the use of hydrofluoric acid and nitric acid. The influence of three process parameters, namely, the concentration of the mixed acids, the liquid-solid ratio, the acid leaching temperature, and the acid leaching time, on the removal efficiency of impurities such as Fe, Mn, Al, K, and Na in quartz sand was systematically investigated. The experimental results revealed that the optimal acid leaching conditions were a hydrochloric acid concentration of 4.5 mol·L − 1 , an oxalic acid concentration of 0.03 mol·L − 1 , a citric acid concentration of 0.04 mol·L − 1 , a liquid-solid ratio (mass ratio) of 5:1, a constant temperature of 60 ℃, and a holding time of 3 h. Under these conditions, the removal rates of Fe, Mn, and Al reached 89.2%, 71.0%, and 60.1%, respectively. Moreover, K and Na were also removed to a certain extent, with removal rates of 39.6% and 25.5%, respectively. Mechanistic analysis revealed that in the ternary mixed acid system, hydrochloric acid provides an acidic environment, and the combination of oxalic acid and citric acid synergistically promotes the dissolution of impurities through complexation, reducing impurities on the surface of quartz sand, improving the cleanliness, and forming micro-porous structures. Compared with the traditional hydrogen fluoride-nitric acid leaching process, the fluorine-free ternary mixed acid system proposed in this study has a similar or even better removal efficiency for impurities such as Fe and avoids the environmental and safety risks associated with hydrogen fluoride. This system can achieve the simultaneous removal of various impurities in quartz sand under normal pressure and medium-low-temperature conditions, providing a new technical path for the development of quartz sand purification technology for safety and environmental protection.
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高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Mei Wang,Lei Yang,Zesheng Wang,Liying Jiang
A novel N-MLG@Ni–Mn LDH/Cys electrode was constructed for Cu²⁺ detection in sweat. • Dual active sites significantly enhance Cu²⁺ adsorption and signal amplification. • The sensor exhibits a wide detection range and a low detection limit for Cu²⁺. • The synergistic effect of N-MLG and Ni–Mn LDH improves electrochemical performance. In this study, a highly sensitive electrochemical sensor based on a N-MLG@Ni-Mn LDH/Cys nanocomposite was fabricated for the detection of trace Cu²⁺ in sweat. Nitrogen-doped multilayer graphene (N-MLG) was electrostatically self-assembled with nickel-manganese layered double hydroxide (Ni-Mn LDH) via their charge complementarity, forming a uniform heterostructure. L -cysteine (Cys) was further introduced as a surface modifier to construct the N-MLG@Ni-Mn LDH/Cys nanocomposite-based electrochemical sensor. Based on the hard-soft acid-base (HSAB) theory, a synergistic adsorption mechanism involving dual active sites was established, which significantly enhanced the preconcentration efficiency and specific recognition ability toward copper ions. Electrochemical measurements were performed using square-wave anodic stripping voltammetry (SWASV). Electrochemical characterization demonstrated that the sensor possesses excellent conductivity and good electrochemical activity. Under optimized experimental conditions, the sensor exhibited outstanding analytical performance. A good linear relationship was obtained for Cu²⁺ in the concentration range of 0.1–500 ppb, with a low detection limit of 0.24 ppb. In addition, the sensor prepared by this method showed good anti-interference capability, repeatability, and long-term stability, and it also performed well in the detection of artificial sweat samples. Overall, these performance advantages provide a feasible technical strategy for noninvasive monitoring of Cu²⁺ in sweat, with broad application prospects. An electrochemical sensing platform was constructed for the sensitive detection of Cu²⁺ in sweat based on an N-MLG@Ni-Mn LDH/Cys composite-modified screen-printed electrode (SPE). The electrostatic self-assembly between negatively charged N-MLG nanosheets and positively charged Ni-Mn LDH laminates leads to a stable intercalated heterostructure with high conductivity and abundant active sites. Subsequent functionalization with L-cysteine introduces sulfhydryl (-SH) groups, enabling specific chelation toward Cu²⁺ and enhancing selectivity. During detection, Cu²⁺ is effectively preconcentrated via the synergistic interactions of hydroxyl (-OH) and sulfhydryl (-SH) groups, followed by electrochemical reduction to Cu⁰ under a negative potential. The deposited Cu⁰ is then oxidized during the stripping process, generating a characteristic current signal proportional to the Cu²⁺ concentration. Combined with SWASV, this dual-active-site strategy achieves high sensitivity, excellent selectivity, and reliable analytical performance, demonstrating its effectiveness for trace Cu²⁺ detection in sweat. Download: Download high-res image (221KB) Download: Download full-size image
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Miaomiao Zhang,Zhen Dai,Yongqi Wang,Xuelei Li,Zhihui Xu,Qingwen Li,Aruuhan Bayaguud
LRNM/LIC delivers 253.4 mAh g⁻ 1 at 0.1 C, outperforming LRNM/LSPSC (168.5 mAh g⁻ 1 ). • LIC forms stable In 2 O 3 passivation layer, but LSPSC has irreversible side reactions. • VGCF enables LRNM/LIC/VGCF to retain 98.72% capacity after 100 cycles at 0.2 C. Cobalt-free lithium-rich manganese-based oxides have emerged as promising cathode materials for all-solid-state lithium batteries (ASSLBs) owing to their high energy density and cost efficiency. This study systematically evaluates the interfacial compatibility between the 0.3Li 2 MnO 2 ·0.7LiNi 0.5 Mn 0.5 O 2 (LRNM) cathode and two representative solid electrolytes—namely, the sulfide electrolyte Li 9.54 Si 1.74 P 1.44 S 11.7 Cl 0.3 (LSPSC) and the halide electrolyte Li 3 InCl 6 (LIC). The LRNM/LIC cathode achieves a high specific discharge capacity of 253.4 mAh g −1 at 0.1 C, which considerably exceeds that of the LRNM/LSPSC cathode (168.5 mAh g −1 ). Moreover, the LRNM/LIC cathode retains 87.32% of its initial capacity after 100 cycles at 0.5 C, indicating excellent cycling stability. The main reason for this improvement is that LSPSC undergoes irreversible side reactions at the interface with LRNM, generating substances such as SO 4 2- , SO 3 2- , and polysulfides. By contrast, LIC reacts with LRNM to form a stable interface layer (In 2 O 3 passivation layer), which inhibits continuous interfacial side reactions and substantially enhances interface stability. Furthermore, the influence of different conductive agents (vapor-grown carbon fiber (VGCF), carbon nanotubes, and acetylene black) on the conductivity and interfacial stability of LRNM/LIC is explored. Results indicate that the cycling stability of the LRNM/LIC/VGCF cathode is enhanced, achieving a capacity retention rate of 98.72% at 0.2 C after 100 cycles because VGCF forms a continuous three-dimensional conductive network. This study provides valuable insights for the development of low-cost LRNM-based ASSLBs with high energy density. Download: Download high-res image (227KB) Download: Download full-size image
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高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Zhiyong Yang,Guofang Zhang,Ruiqin Zhang,Lu Bai,Shilong Sun,Yiming Li,Zhuocheng Liu,Feng Hu,Jianyi Xu,Ruihua Guo,Yanghuan Zhang
The BaCe 0.98 M 0.02 O 3 (M = Ce, Y, Li, Mn, Ni) solid solution was successfully synthesized via a combustion method. The microstructure and spectra characteristics were analyzed systemically. The X-ray diffraction (XRD) results showed that the structures of the BaCeO 3 -based materials kept cubic perovskite single-phase structure. The findings from the Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analyses revealed that the doped samples exhibited smaller grain sizes and the doped elements are distributed uniformly. The spectral analyses revealed that the doped samples contain higher contents of oxygen vacancies in the lattices. The electrochemical hydrogen storage characteristics of the samples demonstrated that the doped samples possess greater discharge capacities compared to pure BaCeO 3 . The Y-doped sample demonstrated superior electrochemical performance, delivering a remarkable specific capacity of 377 mA h/g (hydrogen content of 4.56 %) with excellent capacity retention of 371 mA h/g after 50 cycles. Moreover, the incorporation of Y ions not only significantly enhanced the rate capability but also effectively suppressed the self-discharge behavior. The hydrogen storage mechanism was speculated. The characteristics of hydrogen storage are significantly influenced by the lattice parameters, the concentration of oxygen vacancies and defects, as well as the nature of the doped ions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Bolong Zhao,Yonggang Sun,Guangsuo Yu,Min Xu,Juan Zhang,Duoning Zhao,Yulong Ma
Nitrogen doping plays a crucial role in activating the Fenton catalytic activity of transition metal oxides. However, the mechanism by which nitrogen doping sites influence the properties of these oxides remains unclear. We successfully incorporated nitrogen atoms into the internal lattice of MnFe 2 O 4 spinel through thermal activation and identified two major doping sites: interstitial nitrogen (N int ) and substitutional nitrogen (N sub ). Through in-situ DIRFTS experiments and DFT calculations, we proposed a unique mechanism. Both sites can effectively activate the catalytic activity of the oxides, but N sub is particularly effective in altering the electron distribution of Mn elements within the lattice. This alteration promotes the transformation of superoxide (•O 2 – /•OOH) to H 2 O 2 , thereby further enhancing catalytic activity. Compared to un-doped MnFe 2 O 4 , experimental results obtained using MnFe 2 O 4 N 0.4 as the catalyst demonstrated that the degradation rate constant of tetracycline in simulated wastewater increased from 0.0072 min −1 to 0.2745 min −1 . Furthermore, the degradation rate of tetracycline reached 98.7 %. For real wastewater experiments, the COD removal rate was 77.4 %, and the mineralization rate was 62.5 %. This study offers new insights into the design of nitrogen-doped transition metal oxide catalysts.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 5
·11994-12004
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IF 5.19
Ye Chen,Fang Tingwei,Long Xinyi,Wang Hui,Chen Shao,Zhou Jie
Compared with that of the transition metal mixed oxide pellet catalyst, the catalytic activity of the supported mixed oxide catalyst was significantly reduced, which was limited in practical industrial applications. In this work, supported Cu-Mn-Ce mixed oxide catalysts were prepared by non-thermal plasma. Catalyst characterization result demonstrated that plasma treatment could promote the proportion of oxygen vacancy and enhance the adsorptive strength of VOCs on the surface of catalyst. Meanwhile, plasma treatment process exerted a slight influence on the pore structure and morphological property of the catalyst. Consequently, CMC/SiO 2 –P exhibited much higher catalytic activity than CMC/SiO 2 prepared by the incipient wetness impregnation method for the catalytic oxidation of toluene and n-hexane. Among the catalysts prepared, the 15%CMC/SiO 2 –P catalyst even exhibited a high catalytic activity comparable to that of the supported noble metal catalyst for the oxidation of the inert hexane. The T 98 of toluene and n-hexane over 15%CMC/SiO 2 –P was 260 and 280°C under the conditions of VOC concentration at 1000 ppm and WHSV at 20,000 mL·g −1 ·h −1 , respectively. This work provided a novel method for the preparation of the supported transition metal mixed oxide catalyst.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Mingyang Li,Wanlu Zhang,Xuewei Zhang,Yongfu Lian,Xiaoyu Niu,Yujun Zhu
Catalytic oxidation is considered as the most effective and economical method to remove low concentration volatile organic compounds (VOCs). Activation of oxygen to form active oxygen species on metal oxides catalyst plays a key role in the process. Three copper-manganese oxide catalysts with cubic Cu 1.5 Mn 1.5 O 4 phases were prepared by microwave heating (CM-MW), sol–gel (CM-SG) and co-precipitation (CM-CP) methods, and applied for the elimination of toluene and benzene as representative aromatic VOCs. These catalysts exhibit different catalytic oxidation performance due to their different physicochemical properties. Various characterizations were used to clarify the role of different oxygen species in the oxidation of VOCs, and the reaction pathway. In situ DRIFTS were carried out to explore the function of surface adsorbed oxygen, oxygen vacancy , and surface lattice oxygen in the catalytic oxidation of VOCs over three catalysts. Various types of intermediate species and detailed reaction pathways are also explored by combining in situ DRIFTS and mass spectrometry . Among these catalysts, CM-MW with nanosheet morphology shows the best catalytic oxidation performance of toluene and/or benzene with/without H 2 O due to the most abundant active oxygen species, and the highest oxygen vacancy concentration which is beneficial to activate oxygen. Meanwhile, toluene and benzene do not interfere with each other during the mixture oxidation. This study can provide new inspiration for rational design of metal oxide catalysts to remove VOCs.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Qiao Li,Xinyue Ma,Chengsi Qi,Rui Li,Wei Zhang,Jiansheng Li,Jinyou Shen,Xiuyun Sun
Effective removal of Sb(III) and Sb(V) has long been an urgent task for protecting human health and environment. In this study, novel magnetic mesoporous Fe Mn binary oxides (MMFMs) were fabricated via calcinating the Mn encapsulated carboxymethyl cellulose-Fe(III) hydrogel, and the structure of MMFMs were closely related to the Fe:Mn ratio. Owing to the mesoporous structure together with synergistic effect of Fe Mn binary component, the MMFMs exhibited excellent mass transfer and adsorption ability to Sb(III) and Sb(V). MMFM 3 achieved a maximum Sb(III) and Sb(V) adsorption capacity of 281.5 and 204.6 mg/g, respectively. Co-existing anions of Cl − , NO 3 − and SO 4 2− exhibited marginal influence on the adsorption for both Sb(III) and Sb(V), except the PO 4 3− for Sb(III) and SiO 3 2− or PO 4 3− for Sb(V). X-ray photoelectron spectroscopic investigation revealed that high valence Mn(IV) was mainly responsible for the oxidation transformation of the highly toxic Sb(III) into less toxic Sb(V), while the FeO x content played major role for the adsorption of Sb(V). The generated inner-sphere Fe O Sb complex between Fe-OH groups and Sb(III/V) dominantly contributed to the removal of Sb(III/V). Overall, mesoporous structure, magnetic separation ability, excellent adsorption performance together with exceptional regeneration properties demonstrated the great potential of MMFMs for Sb(III/V) remediation.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Manman Li,Kunlun Yang,Xin Huang,Shiguang Liu,Yifan Jia,Peng Gu,Hengfeng Miao
In this study, the flat microfiltration ceramic membrane (CM) was modified by wet impregnation method (Mn-Fe-CM) to catalyze ozone (O 3 ) for the oxidative degradation of trimethoprim (TMP). The conventional characterization test showed that the Mn-Fe binary oxides (Mn/FeO x ) with the crystal structure of FeMnO 3 were successfully loaded on the membrane and the catalytic performance of Mn-Fe-CM for O 3 was apparently enhanced as compared to CM. Consequently, compared with O 3 oxidation alone, the degradation and mineralization efficiencies of TMP in the O 3 /Mn-Fe-CM system were both improved and 98.6% of TMP could be removed within 10 min. The degradation efficiency of TMP decreased with the increasing pH and the addition of Cl - 、HCO 3 – 、PO 4 3- , while humic acid (HA) exhibited negative effect on the TMP removal. Radical scavenger experiment and electron paramagnetic resonance (EPR) analysis confirmed that direct oxidation by O 3 played an important role in the degradation of TMP, while hydroxyl radical (·OH) and 1 O 2 also participated. Fe(II) could act as an intermediate to transfer electrons and accelerate the transformation of Mn(III) to Mn(II) and Mn(IV) to Mn(III) during the ozonation process, which definitely strengthened the synergic catalytic effect of Mn-Fe-CM. The proposed degradation mechanism of TMP mainly contained hydroxylation , carbonylation , demethoxylation and deamination . Due to the strong catalytic ozonation performance for organic pollutants degradation, the O 3 /Mn-Fe-CM system revealed better anti-membrane fouling ability, strong cyclic usage performance and high applicability for the actual surface water treatment.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Ying Yang,Yingjie Li,Chunxiao Zhang,Zirui He,Jianli Zhao
CaO/CaCO 3 thermochemical heat storage has been considered as a competitive technology in concentrated solar power plants. Carbide slag and red mud are solid wastes from the chlor-alkali industry and aluminum industry, respectively. In this work, the red mud/Mn co-doped high alumina cement-stabilized carbide slag was synthesized for CaO/CaCO 3 heat storage. The effects of the addition of high alumina cement and red mud/Mn on the heat storage capacity, cyclic stability, and optical absorption of the modified carbide slag were investigated. The modified carbide slag exhibits excellent heat storage capacity and optical absorption. The Ca 3 Al 2 O 6 and CaMnO 3 inhibit the growth of CaO grains. FeMnO 3 and Ca 2 Fe 2 O 5 possess high optical absorption properties . The additions of Mn and red mud enhance the heat storage rate and basicity of the carbide slag. The effective conversion of the modified carbide slag is 0.62 after 30 cycles, which is 3.1 times as high as that of the untreated carbide slag. The modified carbide slag reaches the optical absorptance of ~58%, which is 6.5 times as high as that of the untreated one. Thus, the red mud/Mn co-doped high alumina cement-stabilized carbide slag is a potential candidate for the CaO/CaCO 3 heat storage system .
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Mengzhu Wang,Hengjia Zhu,Bangxiang Liu,Panwang Hu,Jianming Pan,Xiangheng Niu
Multimodal detection is a promising paradigm because of its advantages of expanding usage scenarios and improving reliability. However, it is very challenging to design reasonable strategies to achieve the multimodal sensing of targets. Herein, we developed an unprecedented bimodal ratiometric colorimetric/fluorometric method by exploring a novel bifunctional artificial oxidase mimic, Mn-doped N-rich carbon dots (Mn-CDs), to achieve the high-performance determination of nitrite in complicated matrices. The Mn-CDs exhibited both tunable photoluminescence and high oxidase-like activity, effectively catalyzing the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation to generate blue TMB+. When nitrite was introduced, the TMB+ species generated would specifically react with nitrite to produce diazotized TMB+, resulting in a color change from blue to green and finally to yellow. Simultaneously, the fluorescence of Mn-CDs was quenched by the diazotized TMB+ product via the inner filter effect. Hence, the existence of nitrite could lead to the simultaneous variations of visual color and photoluminescence, providing the principal basis for the bimodal ratiometric colorimetric/fluorometric quantification of the target. With the method, excellent sensitivity, selectivity, reliability, and practicability for nitrite detection were verified. Our work proposes a new bimodal strategy for nitrite measurement using bifunctional CDs-based enzyme mimics, which will inspire future effort on the exploration of promising multifunctional nanozymes and their advanced applications in biochemical sensing.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Lin Zhang,Fenglian Fu,Guangda Yu,Guangzhao Sun,Bing Tang
Ferrihydrite-humic acid co-precipitates have impacts on the adsorption and reduction of Cr(VI) in the natural environment. Besides, ferrihydrite-humic acid co-precipitates usually coexist with foreign metal cations like Al(III) and Mn(II), which may change the properties of ferrihydrite and affect the fate of Cr(VI). In this work, structurally incorporated Al(III) or Mn(II) in ferrihydrite-humic acid co-precipitates with Cr(VI) (Fh-HA-Cr-Al or Fh-HA-Cr-Mn) were prepared, and the behavior and phase transformation of co-precipitates were explored via the characterization analyses of samples during aging for 10 days. This study showed that partial adsorbed Cr(VI) was reduced to Cr(III) in the presence of humic acid , thereby reducing the toxicity of Cr(VI). Interestingly, two different results occurred because of the incorporation of Al(III) and Mn(II). Al(III) hindered the transformation of ferrihydrite and changed the aging products by inhibiting the dissolution of ferrihydrite, which decreased Cr to incorporate iron minerals. By contrast, doping of Mn(II) accelerated the phase transformation of co-precipitates, and was more conducive to the encapsulation and fixation of Cr. The results of this study can facilitate the understanding of the effects of Al(III) and Mn(II) on Cr(VI) fixation during the aging of Fh-HA-Cr.
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高影响因子
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