APPLIED CLAY SCIENCE
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2024
·
IF 5.3
Yi Ye,Linxi Wang,Haiyan Li,Jianhong Luo
Oily wastewater has become one of the great threats to the environment. Membrane separation technology has become a research focus in wastewater treatment due to its advantages in environment protection, low sedimentation cost, low energy consumption and reusability. NPA/ZnMgAl-LDHs (NPA, nylon film material loaded with nano-TiO 2 particles, LDHs , layered double hydroxides) material based on nylon film material (PA) was synthesized using a two-step method. Various characterization methods confirmed the successful introduction of TiO 2 and ZnMgAl-LDHs. The testing of water contact angle (WCA) and underwater oil contact angle (UOCA) confirmed that the original PA substrate possesses hydrophobicity and lipophilicity. The superhydrophilicity and superoleophobicity of NPA/ZnMgAl-LDHs material were brought by the introduction of TiO 2 and ZnMgAl-LDHs. NPA/ZnMgAl-LDHs material shows stable and efficient separation efficiency (> 99%), and exhibits high separation flux in simple oil-water separation and oil in water emulsion demulsification. In addition, its separation efficiency is almost unaffected under environments of different pH, and the separation flux remains at a high level. The photocatalytic activity is another satisfactory result of NPA/ZnMgAl-LDHs material. Methyl orange solution was effectively degraded by NPA/ZnMgAl-LDHs material within 120 min, and the efficiency is up to 99.09%.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Kai Lv,Xu Liang,Qinglin Yao,Liangmiao Zhang,Zongtao Zhang,Yanfeng Gao
This work reports a series of yellow-green near-infrared (NIR) reflective pigments, Ba(Mg 6-x-y Zn y Ti 6-x Cr 2x )O 19 (x = 0–1.0, y = 0–2.5), with strong NIR reflectivity for solar thermal energy regulation. Comprehensive analyses were carried out to characterize the obtained pigments including X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, UV–Vis–NIR spectrophotometry, and CIE L*a*b* color measurement. Absorption spectra of Ba(Mg 6-x Ti 6-x Cr 2x )O 19 showed that the yellow-green absorption is attributed to the octahedrally coordinated Cr 3+ with d-d electron transitions of 4 A 2 (F)→ 4 T 1 (F) and 4 A 2 (F)→ 4 T 2 (F). However, their broad absorption peak centered at 1200 nm severely deteriorated the insulating properties of the pigments. Through substituting Mg with Zn, the obtained pigment Ba(Mg 2.5 Zn 2.5 Ti 5 Cr 2 )O 19 showed an excellent NIR solar reflectance (R* = 67 %) with color performances (L* = 61.98, a* = −18.72, b* = 22.23). EnergyPlus simulation results show that for a warm city (Haikou), the Ba(Mg 2.5 Zn 2.5 Ti 5 Cr 2 )O 19 coating for the external surface of a model house (TSR = 35 %, R* = 55 %) can reduce annual cooling energy consumption by 8 % of the house.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Binyang Luo,Hao Wang,Chao Chen,Lichun Liu,Kai Wu,Haidong Li,Danfeng Ye,Yanyan Li,Li Cui,Jinli Qiao
The Zn dendrite limits the practical application of aqueous zinc-ion batteries in the large-scale energy storage systems. To suppress the growth of Zn dendrites, a zinc ionophore of hydroxychloroquine (defined as HCQ) applied in vivo treatment is investigated as the electrolyte additive. HCQ dynamically regulates zinc ion concentration in the outer Helmholtz layer, promoting even Zn plating at the anode/electrolyte interface . This is evidenced by the scanning electron microscopy, which delivers planar Zn plating after cycling. It is further supported by the X-ray diffraction spectroscopy, which reveals the growth of Zn (0 0 2) plane. Additionally, the reduced production of H 2 during Zn plating/stripping is detected by the in-situ differential electrochemical mass spectrometry (DEMS), which shows the resistance of Zn (0 0 2) to hydrogen evolution reaction. The mechanism of dynamic regulation for zinc ion concentration is demonstrated by the in-situ optical microscopy. The hydrated zinc ion can be further plated more rapidly to the uneven location than the case in other regions, which is resulted from the dynamic regulation for zinc ion concentration. Therefore, the uniform Zn plating is formed. A cycling life of 1100 h is exhibited in the Zn||Zn symmetric cell at 1.6 mA cm −2 with the capacity of 1.6 mAh cm −2 . The Zn||Cu battery exhibits a cycling life of 200 cycles at 4 mA cm −2 with a capacity of 4 mAh cm −2 and the average Coulombic efficiency is larger than 99 %. The Zn||VO 2 battery with HCQ modified electrolyte can operate for 1500 cycles at 4 A g −1 with a capacity retention of 90 %. This strategy in the present work is wished to advance the development of zinc-ion batteries for practical application.
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International Journal of Electrochemical Science
·
2024
·
IF 1.3
Qijing Zhang,Kaijie Liang,Zhengri Shao,Jinguang Liang,Baoyi Ren
This article has been retracted: please see Elsevier Policy on Article Withdrawal ( https://www.elsevier.com/locate/withdrawalpolicy ). This article has been retracted at the request of the Editor-in-Chief. A post-publication investigation was prompted by concerns raised by the authors about the integrity of the results presented in their published article. Based upon the information provided by the authors and their subsequent assessment, the Editor-in-Chief lost confidence in the validity of the results reported in the paper. A decision to retract the article was therefore made in accordance with the journal's commitment to upholding the highest standards of scientific integrity and accuracy in published research.
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Water
·
2024
·Vol. 16
·期 14
·2026
·
IF 3
Yang Gu,Chengjun Qiu,Wei Qu,Wei Tao,Zizi Zhao,Huili Hao
Cadmium (Cd) and zinc (Zn) in seawater enter the human body through the food chain. Combined toxicity tests indicated that high concentrations of Cd(II) and low concentrations of Zn(II) had a synergistic effect on humans. Thus, there is an urgent need to prepare a sensor for rapid and simultaneous detection of Cd(II) and Zn(II) in seawater. Herein, a reduced graphene oxide/carboxylated multi-walled carbon nanotube (rGO/MWCNT-COOH)-modified glassy carbon electrode was prepared in the experiments using the dropping method. The synthesis of various materials achieved the purpose of expanding the surface area, and scanning electron microscopy was used to observe the structure of the composite membrane. Moreover, the large number of functional groups on the surface of the composite membrane can also increase the adsorption of ions. For the determination of trace cadmium (II) and zinc (II) in seawater, the method used was differential pulse voltammetry (DPV). The results show that the peak current, which was obtained in the range of 5–400 μg/L for Cd(II) and Zn(II), has a linear relationship with concentration, corresponding to the detection limits of 0.8 μg/L for Cd(II) and 0.98 μg/L for Zn(II). The modified electrode was used to determine the Cd(II) and Zn(II) content in the coastal seawater of the Maowei Sea, and the recovery rate was between 95.8 and 98.2% for Cd(II) and 96.7~99.4% for Zn(II), which provided a novel approach of detection to define trace Cd(II) and Zn(II) in seawater.
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Processes
·
2024
·Vol. 12
·期 12
·2670
·
IF 2.8
Ke-Hong Chen,Ao-Tian Gu,Liang Zhang,Hao Tang,Zhi-Ming Zhang,Yi-Ming Zhou,Yu-Qi Cheng,Yi Yang
Chloramphenicol antibiotics (CAPs) are broad-spectrum antibiotics, and excessive consumption has led to increasingly dangerous residues in the environment. The accumulation of these highly toxic and difficult-to-biodegrade CAPs and their long-term exposure in ecological environments can pose insidious and long-term hazards to human health and aquatic organisms. In this study, co-carbon composite nanocatalysts (CoxZn10−x-NC) with many carbon nanotubes on the surface were prepared via the one-step pyrolysis of bimetallic CoxZn10−x-ZIF with different Co/Zn ratios and used for the degradation of trace amounts of CAPs in a water column. The microstructure and chemical composition of the prepared catalysts were fully characterized using SEM, TEM, and XPS. The CAP degradation experiments demonstrated that Co6Zn4-NC in CoxZn10−x-NC possessed the highest catalytic activity level, removing 100% of the CAPs in 60 min. The CAPs had a corresponding reaction rate constant of 0.22 min−1, and Co6Zn4-NC was able to completely mineralize 44.57% of them. Doping moderate amounts of Zn can effectively improve the carbon nanotube structure on the catalyst surface and promote the generation of monoatomic Co, thus improving catalytic activity. The results of the free-radical burst experiments and electron paramagnetic resonance (EPR) showed that the free-radical pathway mainly dominated within the Co6Zn4-NC+PMS system, in which SO4•−was the main ROS for CAP degradation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
·
IF 20.2
Yongjian Wei,Ying Li,Yunfei Xu,Yuze Zu,Yinghui Sun,Tong Xu,Haiou Liang,Jie Bai
Exploring the impact of metal oxide crystal facets on the cycloaddition reaction of CO 2 with epoxides is meaningful because pure metal oxides exposing specific crystal facets show considerable promise as catalysts for industrial applications. In this study, we developed a simple strategy to prepare single-crystal ZnO nanosheet materials with controllable crystal facets through hydrothermal synthesis, followed by pyrolysis under different atmospheres. Studies revealed that the formation of ZnO single-crystal nanosheets involves the decomposition of the precursors and an ordered phase transition. Based on the quantitative correlation between oxygen vacancies, surface Zn, and the catalytic activity of ZnO (002) with varying numbers of oxygen vacancies, together with TPD, Py-IR, in-situ EPR, fluorescence spectroscopy characterizations, and DFT calculations, a synergistic mechanism between oxygen vacancies and surface Zn was proposed. Specifically, oxygen vacancies are the active sites for CO 2 , whereas saturated coordination surface Zn atoms activate epoxides. At 125 °C, 2 MPa, and 4 h, 93.3 % yield of the product was achieved using only 5 mg of the optimal ZnO catalyst. The excellent performance, stability, and applicability of single-crystal nanosheets make them ideal candidates for industrial applications. This study provides a new insight into the catalytic mechanisms of CO 2 cycloaddition over metal oxides.
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LANGMUIR
·
2025
·
IF 3.9
Shiqin Long,Qingze Chen,Hongyan Wei,Jing Liu,Shoushu Wei,Yixuan Yang,Hongbo Li,Runliang Zhu,Hongping He
Soil minerals are important natural adsorbents that regulate heavy metal fate; yet, the influence of natural drying on their adsorption behavior remains poorly understood. This study compared how drying affects Cd(II) and Zn(II) retention and selectivity on two widespread soil minerals, ferrihydrite (Fhy) and kaolinite (Kln), using single/binary adsorption experiments. Results indicated that drying significantly enhanced Cd(II) and Zn(II) retention on Fhy by promoting inner-sphere complexation and enhancing the stability of metal-mineral bonds, as evidenced by extended X-ray absorption fine structure (EXAFS) spectroscopy analyses. In contrast, the effect on Kln was less pronounced, with Cd(II) and Zn(II) predominantly adsorbed via electrostatic interactions and drying having a minimal impact. Crucially, drying induced contrasting selectivity changes: it enhanced the selective adsorption of Zn(II) on Kln while favoring Cd(II) selectivity on Fhy. Density functional theory (DFT) computations corroborated this finding, showing lower adsorption energies for Cd(II) than for Zn(II) on Fhy, with the reverse trend observed on Kln. This preferential adsorption of Cd(II) on Fhy and Zn(II) on Kln after drying was attributed to the drying process facilitating the formation of more stable bonds between metal ions and mineral surfaces. These findings establish a theoretical framework for predicting the fate of metals in dehydration-affected soils and contribute to a systematic understanding of the environmental functionality of soil minerals.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Qian Zhang,Kang Chen,Xinwen Li,Yanan Wei,Ying Hu,Rongmei Liu,Guixiang Qian,Zhongliang Tian,Chao Yang
Lithium extraction from salt lakes represents a crucial approach to developing lithium resources and plays a vital role in advancing the global energy transition. China possesses abundant lithium resources in its salt lakes. However, the high sodium content present in salt lake brines presents a significant challenge to efficient lithium extraction. This study investigates the capability of the LiFePO 4 -Zn battery system for extracting lithium from salt lake brine with a high Na + /Li + ratio. The system demonstrates a significant rejection effect on Na + and exceptional selectivity for Li + , even in high-concentration sodium ion aqueous solutions. In a chloride aqueous solution containing 0.25 g/L of Li⁺ and 100 g/L of Na⁺, the sodium-to-lithium mass ratio decreased from 400 to 13.52 after three cycles, indicating that the extraction efficiency of Li⁺ achieved reached 90.28 %.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Cuihuan Lv,Jinpeng Cai,Guohui Wang,Jiuxiu Chen,Hao Lai,Peilun Shen,Dianwen Liu
Organic depressants often exhibit low selectivity at high dosages, and introduce risks of concentrate dewatering. The combined depressants composed of inorganic and organic substances can significantly reduce reliance on organic depressant dosage, providing a promising solution to this challenge. In order to achieve highly efficient separation of sphalerite and pyrite in the CuSO 4 -butyl xanthate (PBX) flotation system, the combined depressant Fe 2+ / baicalin (BCL) was innovatively employed to inhibit copper-activated pyrite. The flotation tests indicate that compared with the single depressant BCL, the combined depressant Fe 2+ /BCL demonstrates superior selective inhibitory effects on copper-activated pyrite. For artificially mixed ores, a zinc concentrate is obtained with a zinc grade of 62.33 % and a zinc recovery of 93.86 % when the combined depressant of 10 mg/L Fe 2+ and 5 mg/L BCL are used, and the separation efficiency is significantly improved from 40.66 to 79.69 %. Adsorption characteristic studies indicated that BCL exhibits stronger affinity for copper-activated pyrite than for sphalerite. The introduced Fe 2+ provide additional active sites, thereby enhancing the depression effect on copper-activated pyrite. Following Fe 2+ /BCL modification, the adsorption of PBX on copper-activated pyrite was hindered, while having no substantial impact of that on sphalerite, which is also confirmed by molecular dynamics simulations. Therefore, the combined depressant Fe 2+ /BCL markedly widened the hydrophobicity difference between sphalerite and pyrite, creating the potential for their effective separation.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xiao Yang,Shuting Huang,Dongyun Chen,Shihong Dong,Najun Li,Qingfeng Xu,Hua Li,Jianmei Lu
Microbial fuel cells (MFCs) offer simultaneous wastewater treatment and energy generation, but their performance is limited by sluggish oxygen reduction reaction (ORR) kinetics at the cathode. To address this, we aimed to develop a low-cost, high-performance catalyst as an alternative to noble metals. We hypothesized that a hollow Zn/multi-heteroatom co-doped carbon structure derived from ZIF-8 could enhance ORR activity by improving active site exposure and charge transport. The catalyst was synthesized via template-guided structural transformation and optimized pyrolysis. The resulting Zn/DAFP-800 exhibited a high surface area (748.62 m 2 g −1 ), a Tafel slope of 71.24 mV dec −1 , and achieved a maximum power density of 2535.32 ± 7.64 mW m −2 in MFCs with 93.62 % retention over 30 days. Additionally, it achieved 92 % chemical oxygen demand (COD) removal in simulated industrial wastewater. These findings demonstrate the catalyst’s promise for practical applications in electrocatalysis and sustainable energy conversion systems.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 9
·e70363
·
IF 0
Zi-hang Yuan,Si-ya Zheng,Yu-mei Dai,En Tang
The escalating global challenges posed by antibiotic resistance and oxidative stress demand the urgent development of dual-functional materials integrating both antimicrobial and antioxidant capacities to address these intertwined biological threats. This raises a pivotal question: Why not engineer a material capable of simultaneously delivering antioxidant and antibacterial functionalities? To bridge this critical gap, we strategically designed two novel Co and Zn metal–organic frameworks (MOFs) through supramolecular interactions to achieve synergistic antimicrobial–antioxidant performance, rigorously validated via multimodal characterization. Different from traditional antibiotics, these MOFs exert antibacterial effects by controlling the release of metal ions and other mechanisms. Co and Zn-MOFs demonstrated robust antimicrobial efficacy against both Gram-negative and Gram-positive bacteria, coupled with potent antioxidant properties. Zn-MOFs exhibited enhanced antibacterial activity by intensifying membrane disruption via strengthened hydrophobic interactions with bacterial surfaces, whereas Co-MOFs showcased superior antioxidant capacity derived from their redox-active nature. This study unravels the critical mechanistic interplay between metal-bacteria interfacial dynamics and the preservation of cell wall structural integrity. These MOFs redefine multifunctional material paradigms for combating drug-resistant pathogens and oxidative damage, offering transformative potential for biomedical innovations and beyond.
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