SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Bin Xu,Baobin Wang,Zhiling Du,Zilong Han,Changhai Ji,Rongting Ji,Zheng Wang,Zhiying Li,Kaixiang Jiang,Wenzhong Yang
Following the design concept of high efficiency, environmental friendliness, and stable performance, the application of an electrodeposition-capacitive deionization combined process for copper removal from high-concentration wastewater is the first time proposed in this study. As a pretreatment, electrodeposition exhibited efficient copper ions removal capacity (94.53 %) within only 80 min, and the optimal operation conditions were obtained as 75 mA/cm 2 current density, 1.5 cm electrode spacing, pH value 4, and 1000 mg/L initial copper ion concentration. The electrodeposit predominantly consisted of Cu 0 with minor copper oxide impurities was characterized and can be reintroduced into the production process as a valuable raw material. Subsequently, the wastewater underwent advanced treatment via capacitive deionization technology, resulting in the final copper ion concentration of 0.43 mg/L, which met the discharge limit of criteria (GB 39731–2020, less than 0.5 mg/L). The experimental results demonstrate that the combined process is feasible for treating high-concentration copper-containing wastewater, thereby offering a new technological pathway for the efficient wastewater treatment and resource recovery.
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ChemistrySelect
·
2025
·Vol. 10
·期 37
·e03784
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IF 2
Lisha Zhang,Shengming Zhu,Yawen Sun,Rui Duan,Yuting Jin,Jiawei Zhang,Yuan Dang,Zhaomin Song,Xuemao Guan
Porous carbon materials have been considered as one of the most suitable candidate cathodes for the aqueous supercapacitors due to their wide sources, low cost, high structure stability, and surface area. The doping strategy is always used to enhance their electrochemical energy storage performances. Previous works focus on the effective treatment of different carbon precursors to promote their electrochemical properties but little works pay attention to the modification of commercial activated carbon (AC). Herein, a simple and facile way to prepare nitrogen, oxygen co-doping activated carbon (N, O-AC-2) with porous structure has been proposed and developed via one-step pyrolysis. With the more doping content, especially oxygen content with abundant C═O functional groups, the N, O-AC-2 for the supercapacitors exhibits high specific capacitance and excellent rate performance. Furthermore, N, O-AC-2 electrode for the zinc ion hybrid capacitor also shows good electrochemical performance in terms of high capacitance, rate capability, and cycle stability with a high capacity retention. Thus, this one-step co-doping strategy of modifying the AC is promising to provide information for the doping modification and synthesis of porous carbon and facilitate the development of good-performance porous carbon electrode materials. Graphical By heat treatment with the addition of KOH and urea, a nitrogen and oxygen co-doping strategy for modifying commercial porous activated carbon is proposed to achieve excellent electrochemical performance. The effect of KOH and urea on the structural and electrochemical performance is further investigated.
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Journal of the American Chemical Society
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2025
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IF 15.6
Yunbo Dai,Zhangyi Xiong,Haoyu Yin,Chunyu Lai,Xiaole Weng,Zhijie Chen,Le Shi
The electrochemical chlorine evolution reaction (CER) is crucial for the chlor-alkali industry but is often hindered by the competing oxygen evolution reaction (OER). The current electrocatalysts for CER have been predominantly metal-based or noble-metal-based materials, such as dimensionally stable anodes (DSAs). Herein, we synthesized a series of metal-free covalent organic frameworks (Tp-Pa-COFs), showing an unexpected CER activity with an overpotential (102 mV) lower than DSA (182 mV) at a current density of 400 mA cm–2 at 90 °C. The Tp-Pa-COF showed superior CER selectivity (100 ± 4%) and stability (over 200 h) compared to noble metal and non-noble metal catalysts. Through operando characterization and theoretical calculations, we identified carbonyl and amine groups as active sites, where preferential Cl– adsorption breaks the conventional CER-OER scaling relationship. This study highlights the potential of COF-based materials as highly efficient, sustainable alternatives for industrial chlorine production, advancing the development of metal-free electrocatalysts.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Bingyuan Zhang,Xiaoyu Guan,Jiahe Ren,Sai Zheng,Qingxin Han,Yanxia Zhu,Dongping Li,Motoki Ueda,Xue-Chuan Wang,Yi Chen
The continuous supply of clean energy is one of the major challenges faced by all mankind. In this work, combining the wisdom of the biology with hydrovoltaic electricity technology, the biomimetic hydrovoltaic devices that can provide continuous power generation are proposed. To achieve excellent power generation performance with large-scale applications, the leather collagen fibers (CF) bearing natural nano-/micro-channels and abundant oxygen-containing groups are employed as the matrix, which is then constructed as hydrovoltaic devices by Spruce isomorphic mapping strategy to solve the fatigue and insufficient stamina existing in the water evaporation process. The final products, collagen fiber-based hydrovoltaic devices (CFHD) gain an efficient energy output, exemplified by their Voc (0.58 V) approximately six times of that the collagen fiber-based evaporator (0.10 V). The six CFHD in series can obtain the Voc of 3.51 V and in parallel achieve the Isc of 30.63 μA. Combined with their excellent thermal stability, flexibility, applicability, low cost, convenient assembly, miniaturization, and all-weather power generation, the CFHD show great promise in outdoor power generation. Therefore, the present work aims to provide advanced hydrovoltaic power generation devices especially for energy scarcity areas to support their operation and development, and meanwhile actuate advancements in the green energy storage and conversion field.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Yang Zhang,Peng Lu,Chi Feng,Xuhua Zheng,Pengbo Hu
Benzene (C 6 H 6 ) is a typical gaseous pollutant in newly-decorated buildings, which is harmful to people's health. For fast and complete purification of C 6 H 6 , photocatalysis has been widely applied. However, effectively purifying low-concentration but still detrimental C 6 H 6 remains troublesome. To address this issue, this study aims to investigate the commonly-detected concentration of C 6 H 6 and prepares germanium & graphene quantum dots-doped titanium dioxide (Ge-GQDs/TiO 2 ) via the hydrothermal impregnation method for its purification. In the meantime, density functional theory (DFT) calculations are used to uncover the microscopic mechanisms in the above experiments. The characterization results reveal that replacing Ti 4+ with Ge 4+ generates lattice distortion (thereby producing oxygen vacancies and Ge-O-Ti for wider visible-light absorption) and functional groups of dopant GQDs achieve π → π ⁎ conjugation (thereby preventing nanoparticle aggregation and constructing hierarchical porosity). The experimental results demonstrate that 0.2 wt% Ge-0.3 wt% GQDs/TiO 2 achieves 100 % purification efficiency of 15 ppm C 6 H 6 within 2 h at 25 °C and RH 5 % with its losses being less than 15 % after 20 purification-regeneration cycles. The DFT calculation results disclose that doping of both Ge and GQDs enhances the adsorption intensity of C 6 H 6 and lowers the transition-state (TS) energy barriers of first-order decomposition of C 6 H 6 , making the purification process easier. This study provides a systematic comprehension of low-concentration C 6 H 6 purification in buildings.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Yujie Wang,Xiaoqiang Li,Wenjie Zhu,Ce Zheng
Conventional methods like hot pressing (HP) for fabricating SiC-ZrC ceramics typically require high temperatures and external pressure, which can significantly degrade the performance of SiC fibers and restrict the nuclear application of SiC-ZrC composites. In contrast, this work successfully fabricated dense, high-purity SiC-ZrC ceramics with no obvious residual Si using a relatively low-temperature and pressureless RMI method. An obvious correlation between byproduct ZrSi 2 and processing temperature was observed. Notably, significant phase homogeneity differences were observed in the ceramics obtained from pure Si versus Si-Zr alloy infiltration. The low-temperature and pressureless preparation process of the RMI method in this study has promoted the application of SiC-ZrC ceramics as a modified matrix in SiC f /SiC composites for accident-tolerant fuel (ATF) cladding.
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Small
·
2025
·
IF 12.1
Lujia Chai,Zhaoen Liu,Yiwen Hu,Yiming Zheng,Yujuan Chen,Liang Zhang,Zihua Yang,Qingpeng Wang,Dong Sun,Kelei Zhuo
The inherent limitations of zinc anodes constrain the performance of zinc-ion batteries (ZIBs). Viable electrolyte additives offer a practical approach for stabilizing the zinc anode interfaces. This work systematically investigates the role of nitrogen/fluorine co-doped carbon dots (NF-CDs) as an electrolyte additive. Theoretical investigations indicate that the nitrogen and fluorine atoms on NF-CDs have stronger binding energies with Zn 2+ than water molecules and Zn 2+ , enabling NF-CDs to partially replace coordinated water within the Zn 2+ solvation sheath and reconstruct the Zn 2+ solvation structure. This mechanism is corroborated by nuclear magnetic resonance and Fourier transform infrared spectroscopy. The reconfigured solvation structure weakens the coordination between the bound water and Zn 2+ , inhibiting water-induced side reactions and enhancing the electrode's electrochemical stability. Concurrently, NF-CDs’ steric hindrance contributes to interfacial stabilization, facilitates the diffusion of solvated Zn 2+ , and mitigates zinc aggregation. Consequently, the zinc-symmetric cells incorporating NF-CDs achieve stable cycling for 1600 h at 1 mA cm −2 , while the zinc-copper cells maintain a 99.67% average coulombic efficiency over 900 cycles. The Zn||NVO (NaV 3 O 8 ·1.5H 2 O) full cell retains a specific capacity of 140 mAh g −1 after 1000 cycles at 5 A g −1 . The results demonstrate the NF-CDs’ potential as additives for enhancing the stability of ZIBs.
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PubMed
高影响因子
WATER RESEARCH
·
2026
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IF 12.8
Bin Chen,Weihu Zhang,Yunyun Guo,Yuan Bai,Lele Cui,Wenheng Jing
Electrochemical synthesis of hydrogen peroxide (H 2 O 2 ) presents a sustainable paradigm for decentralized chemical manufacturing, yet its practical implementation is severely impeded by catastrophic scaling in tap water electrolytes. Here, we reveal that on conventional gas diffusion electrodes, localized alkalinity-induced scaling precipitates a fatal hydrophilic transition, triggering irreversible water flooding and failure. To circumvent this, we introduce a structurally discontinuous electrode architecture engineered with artificial micro-cracks, which demonstrates exceptional stability for over 800 h at 100 mA cm −2 in tap-water-based electrolytes while maintaining a Faradaic efficiency >80 %. Operando electrochemical reflection-absorption imaging elucidates a unique tolerance mechanism wherein the crack channels retain their hydrophobicity and gas permeability to support sustained reaction despite the severe deactivation of catalyst islands by scaling. Leveraging this design, we engineer a scaled-up, membrane-free electrolyzer that, operating directly with tap water at 100 mA cm −2 , achieves high-throughput H 2 O 2 production (600 mL min −1 ) for >200 h. This work resolves the critical hardness tolerance bottleneck, establishing a robust foundation for the deployment of on-site H 2 O 2 electrosynthesis in diverse real-world water matrices.
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Journal of Energy Storage
·
2026
·
IF 10.7
Xueli Chen,Lu Han,Litao Zhao,Guangzhen Zhao,Guoliang Gao,Lianghao Yu,Xiuyang Shan,Quan Lin,Guang Zhu,Hailong Huang
The key challenge impeding the advancement of aqueous MHS lies the fabrication of structurally stable electrode materials with exceptional reaction kinetics and superior cycling performance. In this study, we employed elemental doping strategies to synthesize MnFe-6, which has wide interlayer spacing and an abundance of oxygen vacancies, by modulating its morphology and optimizing its structure. The MnFe-6 demonstrated superior electrochemical performance (199.4 F g −1 at 1 A g −1 ) in three-electrode tests. Systematic ex-situ XRD and XPS analysis reveal that the material's exceptional electrochemical properties originate from the pseudo capacitance generated by the reactions involving Mn 2+ and Mn 3+ /Mn 4+ , combined with the charge compensation facilitated by oxygen vacancies. An asymmetric MHS with MnFe-6 as the cathode material exhibits a specific capacitance of 171.2 F g −1 at 1 A g −1 .The MHS attained an excellent energy density of 160.7 Wh kg −1 at power density of 1299.8 W kg −1 . Moreover, it exhibited exceptional cyclability, retaining 96.5% of primary capacitance after 60,000 cycles tests at 10 A g −1 . This study establishes elemental doping as a viable and efficient strategy for the development of advanced MHS electrode materials.
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Bioengineering-Basel
·
2026
·Vol. 13
·期 3
·
IF 4.4
Tianyi Wang,Wenzhuo Chen,Yichen Liu,Kailiang Ren,Jin Liang,Jie Kong
Due to its affordability, widespread availability, non-toxicity, biodegradability, and renewability, cellulose is considered a crucial material for addressing the depletion of petroleum resources. In this study, a rotaxane-based supramolecular polymer derived from thermoplastic polyurethane (TPU) was synthesized and combined with cellulose to create a TPU–cellulose composite (TPU-C). This composite was employed as a separator for acrylate-based quasi-solid polymer electrolytes (QPEs). The polymer electrolyte demonstrated a high ionic conductivity of 0.16 mS cm−1at room temperature, a lithium-ion transference number of 0.63, and an electrochemical stability window extending up to 4.7 V. When paired with a LiFePO4(LFP) cathode, the coin cell retained 88.8% of its capacity after 100 cycles at 1 C. A cell assembled with Li and a high-voltage NCM622 cathode maintained a capacity of 65.8% after 100 cycles at 0.3 C. Additionally, the excellent electrochemical performance was analyzed through density functional theory (DFT) calculations to identify the underlying reasons for its outstanding behavior. This study offers new insights into expanding the application potential of cellulose-based composite materials.
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JOURNAL OF POWER SOURCES
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2026
·
IF 8.4
Ling Sheng,Hang Wang,Shaoyang Wu,Fan Wu,Xin Ye,Kang Liang,Jianbin Li,Peng Wei,Yurong Ren
Pitch serves as an economical substance characterized by a high carbon output, rendering it appropriate for employment as negative electrode components in Na-ion batteries, thereby facilitating enhanced value-added utilization. However, through direct thermal decomposition of pitch, the resulting carbon materials characterized by high graphitization, reduced interlayer spacing, and challenges in sodium ion deintercalation, ultimately leading to limited electrochemical performance. To expand the carbon interlayer spacing, this study adopted the phosphorus doping strategy, using NaH 2 PO 2 as the phosphorus source, which interacts with the aromatic molecules in pitch to form P-C bonds. The introduction of P-C bonds effectively suppressed graphite microcrystal development during high-temperature carbonization, resulting in decreased graphitization levels and expanded interlayer distances in the carbon matrix. Besides, P-C bonds demonstrate dual functionality by improving sodium ion adsorption while simultaneously reacting with alkali metal Na + to form Na x PC y , which directly participated in sodium storage. Consequently, the soft carbon material that has been doped with phosphorus showcases enhances sodium storage capabilities when compared to traditional soft carbon material obtained through direct pyrolysis, achieving a discharge capacity of 138.56 mAh g −1 when tested over 3500 cycles at 1 A g −1 . Therefore, this research demonstrates a simple and effective method for utilizing pitch in the sodium-ion batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Lu Yang,Liang Zhou,Liang Yuan,Junli Ren,Chuanfu Liu,Zengyong Li
The development of efficient catalytic systems for the low-temperature oxidation of biomass-derived sugars to value-added acids remains a key challenge in sustainable biorefining. In this study, a palladium catalyst supported on amine-functionalized biochar (Pd/BC-NH 2 ) derived from corn straw for the oxidation of corn straw hydrolysate. The catalyst achieved an exceptional total sugar acid yield of 88.2% under mild conditions at 323 K with NaHCO 3 weak base. Comprehensive characterization confirmed successful amine functionalization and Pd immobilization. Kinetic and thermodynamic analyses determined an activation energy of 41.88 kJ·mol −1 and revealed endothermic, non-spontaneous reaction characteristics. DFT calculations elucidated the mechanism, identifying hydroxide ion-assisted aldehyde C − H cleavage as the rate-determining step with an energy barrier of 56.92 kJ·mol −1 . The superior performance is attributed to a synergistic mechanism where NH 2 groups enrich surface OH − concentration and electronically modulate Pd sites. The catalyst maintained excellent stability over 10 cycles. This study provides a sustainable “waste-to-wealth” strategy for biomass valorization using a straw-derived catalytic system, supported by comprehensive mechanistic insights.
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