PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
·
IF 7.8
Jing Bai,Qijia You,Yushuan Peng,Zhihao Li,Yuling Zhang,Qiulin Deng,Huiwei Liao,Faqin Dong,Xiaofeng Zeng,Zixun Yan
In this work, a novel calcium-aluminum layered double hydroxide-chitosan composite gel bead (LDH-CS) was synthesized for the efficient removal of Pb 2+ from high-salinity oil/gas field wastewater. The successful manufacture of CaAl-LDH by coprecipitation was achieved by utilizing CH 3 COONa to activate PG as an alternative to traditional calcium sources, thereby supporting the value-added use of industrial solid waste. Furthermore, the excellent compatibility between CS and LDH was confirmed through multiple characterization techniques, including SEM/EDS, FT-IR, XRD, and XPS. The greatest adsorption capability of LDH-CS was 827.9±9.6 mg g -1 under the optimal conditions of 0.2 g L -1 dosage, pH of 5, and 25 °C, as confirmed by batch experiments. Fixed-bed experiments confirmed that LDH-CS exhibits outstanding selective adsorption performance in high-salinity wastewater systems from actual oil/gas field, achieving a 99% removal efficiency for Pb 2+ . Compared with traditional powder adsorbents, the efficiency of solid-liquid separation after adsorption is substantially improved by embedding LDH powder in chitosan matrix in LDH-CS gel bead. This design prevents secondary pollution from suspended particles and ensures heavy metal release levels are well below safety limits. LDH-CS provides a practical, efficient and cost-effective technical solution for the treatment of lead-containing wastewater.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
·
IF 4.1
Yaoxia Yang,Fuxing Zhou,Ruirui Zhang,Bolin Xiong,Zhen Yao,Dongfei Sun,Qingtao Wang,Zhiwang Yang
Hydrogen is the most suitable green energy for the current era, and electrolyzing water to produce hydrogen is the most efficient preparation method. The development of efficient oxygen evolution reaction (OER) electrocatalysts is crucial for sustainable energy conversion. In our work, we construct a hierarchical CNFS@NiFe-LDH/NF heterostructure by integrating ZIF-67-derived cobalt sulfide with nickel‑iron layered double hydroxide (LDH) and bimetallic sulfides on nickel foam (NF). This composite synergistically combines the high surface area and active sites from the MOF-derived sulfide, the tunable layered structure and abundant -OH groups from the LDH-which facilitate OH − adsorption and O O formation-as well as electronic modulation effects from the bimetallic sulfides. The catalyst exhibits excellent OER performance with an overpotential of 236 mV at 10 mA cm −2 and a Tafel slope of 42.23 mV dec −1 under alkaline conditions, and maintains high conductivity and low charge transfer resistance throughout operation. Meanwhile, the catalyst showed excellent stability for at least 66 h during the OER process at 50 mA cm −2 , which demonstrates outstanding durability. Moreover, this catalyst have satisfactory hydrophilicity/aerophobicity. This work provides an effective strategy for designing high-performance and stable electrocatalysts via heterogeneous interface engineering.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Qinglei Sun,Mei Tang,Peter Vang Hendriksen,Bo Chen
A novel hierarchically porous magnetic ZnFe 2 O 4 /MgAl-layered double hydroxide (LDH) was reported as an effective adsorbent for the elimination of Congo Red (CR) from water. Three-dimensional stackable MgAl-LDH nanosheets synthesized through hydrothermal method were attached to the surface of ZnFe 2 O 4 microsphere , using the inexpensive, non-toxic, quick and simple bio-template technique. Mg/Al molar ratios played a crucial role in crystal phase synthesis and adsorption capacity. Adsorption kinetics and thermodynamics of CR adsorption by ZnFe 2 O 4 /MgAl-LDH were also investigated. The adsorption kinetics followed the pseudo-second-order. The maximum adsorption capacity (294.12 mg g −1 ) was obtained by the ZnFe 2 O 4 /MgAl-LDH with Mg/Al molar of 2, which was more productive than the base adsorbent without MgAl-LDH attaching (28.58 mg g −1 ). Adsorption isotherm revealed Langmuir-type monolayer adsorption. The adsorption processes were spontaneous and endothermic in nature. Absorbents fabricated in this work could be easily regenerated by rinsing the material in methanol and magnetically separated from the solution. Adsorbent synthesized in this work is very promising composite for purification of water from toxic chemicals.
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高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Junjun Lv,Linmeng Wang,Rushuo Li,Kaiyue Zhang,Danfeng Zhao,Yaqiong Li,Xiangjun Li,Xiubing Huang,Ge Wang
The development of high-performance electrocatalysts is a highly efficient strategy to optimize the sluggish kinetic property of the oxygen evolution reaction (OER). Herein, we synthesize a kind of nickel foam (NF)-supported electrocatalyst composed of a one-dimensional Co3O4 nanowire as the core and a two-dimensional NiFe-LDH nanosheet as the shell (denoted as NiFe-60/Co3O4@NF). Fluorine is introduced into the precursor Co(OH)F of Co3O4, which results in improved thermal stability and significantly increased regularly distributed oxygen vacancies, while the electrochemically deposited NiFe-LDH nanosheets possess a crystalline/amorphous hybrid structure. As a result, the hetero-interface mainly constituting Ni species from NiFe-LDH and Co3O4 from Co(OH)F contributes to the interaction between Co and Fe species and facilitates the electron transfer. Simultaneously, the interaction between oxygen vacancies in Co3O4 and coordinatively unsaturated Fe species in the amorphous area in NiFe-LDH is also determined, finally completing the electron backtracking. Benefiting from these factors, only low overpotentials of 221 and 257 mV are required to deliver the current densities of 100 and 500 mA cm–2, respectively, with a quite small Tafel slope of 34.6 mV dec–1 during OER for the well-designed NiFe-60/Co3O4@NF electrocatalyst.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Liang Xie,Shixia Chen,Yicheng Hu,Yeqian Lan,Xiang Li,Qiang Deng,Jun Wang,Zheling Zeng,Shuguang Deng
Cobalt-nickel bimetallic phosphide intersectional nanosheet arrays are fabricated on carbon fiber cloth (CoNi-LDH-350P@CFC) via facile one-step hydrothermal synthesis of CoNi-LDH and a sequent phosphating at an optimal temperature (350 °C). Phosphating temperature is proven to be crucial in modulating the morphology and structure of phosphatized LDHs. The CoNi-LDH-350P@CFC nanosheet arrays not only provide sufficient redox-active sites but also boost the electrical conductivity and facilitate the ion and charge transport. Consequently, the CoNi-LDH-350P@CFC as a self-supported electrode could deliver an ultrahigh specific capacity of 803 C g −1 (or 223 mAh g −1 ) at a current density of 0.5 A g −1 and superior rate retention of 70% at a high rate of 30 A g −1 . Furthermore, the assembled CoNi-LDH-350P@CFC//active carbon (AC) asymmetric supercapacitors (ASCs) can exhibit an impressive energy density of 42 Wh kg −1 at a power density of 400.4 W kg −1 with acceptable cycling stability of 87.7% capacitance retention after 3000 cycles at 10 A g −1 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mingyu Wang,Honglin Kuang,Lu Zhou,Mengru Shan,Sihao Jiang,Danying Ma,Shiwen Lv,Yanqing Cong,Yingqi Song,Yi Zhang
Sea urchin-like Cu x S nanoflowers were prepared on copper foam substrate by in situ thermal oxidation and hydrothermal vulcanization. Then, thiophene (Th) was copolymerized with MgAl layered double hydroxide (MgAl-LDH) on Cu x S to obtain a polythiophene (PTh)/MgAl-LDH@Cu x S composite photocathode. Under visible-light irradiation, the electrode exhibits high photocurrent response and excellent stability for 72 h. Under an applied voltage of 3 V, the photogenic carrier was effectively separated, and combined with the graphite anode to generate highly oxidizing reactive oxygen species (ROS) and active chlorine directly and indirectly, which can achieve logarithmic inactivation of 7.57 and 7.07 log 10 CFU/mL against Escherichia coli and Bacillus subtilis within 15 and 25 min, respectively. The mechanism of photoelectrocatalytic reaction for disinfection was explored through cell membrane integrity, DNA/protein leakage and active substances analysis, and a free radical capture experiment proved that O 2 ∙– and h + played key roles in the disinfection process. The purification and degradation of different actual wastewaters show that the photoelectrocatalytic system has great practical application potential in water disinfection.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Lifeng Hao,Junhuan Zhao,Kangyuan Li,Weiping Zheng,Yanfei Yang,Chenyang Qiu,Zewen Jiang,Wenjun Xia
We report a hydrothermal engineering strategy to synergistically regulate structural barriers, oxygen vacancy-driven redox cycling, and surface functionalization in Ce-NiCo-LDH coatings for ultralong corrosion protection. Vertically aligned LDH nanosheets constructed a tortuous labyrinth barrier to physically impede corrosive species penetration. Oxygen vacancies acted as electron reservoirs to drive Ce 3+ /Ce 4+ redox cycling, enabling dynamic passivation repair via preferential Ce 4+ → Ce 3+ reduction at vacancy sites. Surface functionalization further enhanced protection through two independent pathways: CTAB induced interlocked fibrous nanostructures for mechanical reinforcement, while PFDT grafting formed a fluorine-rich hydrophobic barrier through C-F dipole interactions. EIS characterization demonstrated a 3.6-fold enhancement in charge transfer resistance (Rct = 5.1 × 10 5 Ω·cm 2 ) for the sequentially hydrothermally processed Ce-NiCo-LDHs compared to their single-step counterparts (1.4 × 10 5 Ω·cm 2 ). The CTAB-modified coating achieved 99.0 % inhibition efficiency, while PFDT modification provided long-term hydrophobicity. This triple-scale synergy-structural obstruction, redox-mediated self-healing, and surface engineering-provides a universal framework for designing advanced protective coatings.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Guanyu Qiao,Taotao Ai,Weiwei Bao,Jie Han,Zhifeng Deng,Peng Jiang,Xueling Wei,Xiangyu Zou
The global energy transition driving an urgent need for sustainable renewable energy technologies. Hydrogen’s role as a clean, high-efficiency energy vector stems from its ability to store large amounts of energy without generating carbon emissions, relies on water electrolysis technology for its efficient production. However, commercial noble metal catalysts (IrO 2 and RuO 2 ) have drawbacks such as high cost and poor stability, limiting their large-scale application. To address this, this study developed a hierarchical CoMoO 4 @CoFe-LDH heterostructure catalyst aimed at simultaneously optimizing oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance to achieve efficient overall water splitting. A core–shell structure was constructed through a dual-stage synthesis procedure (hydrothermal growth of CoMoO 4 nanorod arrays followed by electrodeposition of CoFe-LDH nanosheets). In situ analysis revealed that Mo species dissolution during the OER process induces surface reconstruction, generating highly active Co(Fe)OOH species, significantly lowering the reaction energy barrier. Experimental results showed that the catalyst exhibited outstanding OER activity and HER activity. Additionally, the catalyst exhibits outstanding stability (OER continuous operation for 50 h without degradation) and achieves efficient Overall Water Splitting Performance (starting voltage 1.52 V at 10 mA/cm 2 ). Density functional theory (DFT) calculations further confirm the optimized electronic structure at the heterointerface.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Chaoen Li,Ziyu Zhang,Li Che,YuYang Zhou,Honglin Gao,Hanjie Sun,Aiyi Dong
Electrolyzing seawater presents a promising strategy to address the energy crisis. The optimally sulfur-doped S 0.45 -MnCr layered double hydroxide (LDH) catalyst demonstrates exceptional hydrogen evolution reaction (HER) performance in alkaline seawater at 50 °C, requiring overpotentials of only 57.9 mV and 245.4 mV to achieve 10 and 500 mA cm −2 , respectively. For overall seawater splitting, it requires only 1.72 V to deliver 100 mA cm −2 . When used as a cathode in a magnesium-seawater batteries (MSBs), it delivers a power density of 7.80 mW cm −2 . Sulfur doping simultaneously triggers the formation of highly active MnCO 3 during synthesis. Characterization confirms that sulfur doping promotes chromium leaching, thereby enlarging the electrochemical active surface area (ECSA). In situ XRD analysis at various potentials verifies the formation of additional active MnCO 3 species during HER, consistent with the activity enhancement observed in chronopotentiometric measurements. This work offers novel insights for designing bifunctional catalysts for direct seawater electrolysis.
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高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Weihua Fei,Yun Song,Najun Li,Dongyun Chen,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
A visible-light-active Ni foam@ZnO@ZnFe-LDH composite photocatalyst was fabricated with well-defined porous 2D/2D interconnected nanosheets of ZnO and binary ZnFe layered double hydroxide (ZnFe-LDH) growing vertically on the Ni foam substrate. In view of the excellent conductivity of Ni foam, it can be used as an electrode substrate to deposit ZnO nanosheets on the surface by electrodeposition . Then the ultrathin layered 2D ZnFe-LDH was uniformly coated on ZnO nanosheets by hydrothermal method. A highly effective three-electrode photoelectrocatalytic (PEC) system was constructed with Ni foam@ZnO@ZnFe-LDH as photoanode. The 2D/2D core-shell heterojunction formed between ZnO core and ZnFe-LDH shell not only resulted in a narrowing bandgap and increased the visible light absorption of the ZnO, but also promoted the migration of the photogenerated electrons and then the degradation efficiency with a low applied potential was greatly improved. The dyes (Acid Red 1 as model) and hexavalent chromium ions (Cr(VI)) in water can be simultaneously removed by oxidation reaction on the anode and reduction reaction on the cathode, respectively. In addition, the Ni foam@ZnO@ZnFe-LDH composite photocatalyst also showed outstanding stability during the application process. Thus, the photoelectrocatalytic synergitic effect based on Ni foam@ZnO@ZnFe-LDH gives a simple and effective strategy to fast remove Cr(VI) and organic pollutants in PEC process at low voltage.
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 22
·10243-10252
·
IF 9.931
Xiaolong Guo,Tianxu Zheng,Guipeng Ji,Ning Hu,Chaohe Xu,Yuxin Zhang
Rechargeable zinc–air (Zn–air) batteries having high theoretical energy density are the most attractive energy technologies for future electric vehicles and flexible/wearable electronics. However, the serious lack of highly efficient and cost-effective oxygen electrocatalysts is one of the major obstacles for their future commercialization. Herein, we presented a core/shell design based on porous NiCo2O4 nanowires and ultrathin NiMn LDH nanosheets as an efficient method for the synthesis of electrocatalysts for rechargeable Zn–air batteries. Due to the large active surface area, rapid mass/charge transport, and high electron conductivity as well as unique structures, the core/shell NiCo2O4@NiMn LDH materials could deliver a rather low OER overpotential of 255 mV at 10.0 mA cm−2 while maintaining good stability in alkaline media. When these materials were further employed as air-cathode materials for Zn–air batteries, they exhibited an ultrahigh energy density (866 W h kg−1), superior reversibility (initial round-trip efficiency of 63.5%) and excellent stability (voltage gap increased by only about 20 mV after 500 cycles), which were much better than those of commercial Ir/C catalyst. Furthermore, the as-prepared flexible solid Zn–air battery also displayed very good mechanical properties, long cycle life and outstanding round-trip efficiency (70–74%).
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高影响因子
Journal of Water Process Engineering
·
2025
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IF 6.7
Jianchun Qin,Wenlin Zhao,Wensheng Zhao,Gao Cheng,Xiuxian Huang,Yuan Liu,Jiebing He,Xing Wei,Shunyan Ning,Lin Yu
Uranium (U) contamination in natural waters poses a serious threat to both ecosystems and human health. However, the efficient adsorption and separation of U(VI) remains significantly challenging due to its extremely low concentrations and the complexity of coexisting ions. Herein, we demonstrated that MgAl-LDH/CNT composites with synergistic interfacial properties were successfully synthesized via a hydrothermal method, enabling efficient adsorption and separation of U(VI) from various natural waters while maintaining excellent chemical stability and anti-interference capacity. The evaluation of adsorption performance indicated that U(VI) adsorption by MgAl-LDH/CNT composites reached equilibrium within 10 min at pH 3, exhibiting a maximum adsorption capacity of 126.4 mg/g at 298 K. Furthermore, MgAl-LDH/CNT composites exhibited excellent resistance to coexisting ions, maintaining the adsorption efficiency over 95 % after five adsorption-desorption cycles. The adsorption mechanism studies based on FT-IR, XPS, and DFT revealed that the -OH function groups in MgAl-LDH/CNT composites were involved in U(VI) complexation with a binding energy of 3.69 eV. U(VI) was preferentially enriched on the MgAl-LDH surface and its interface with CNT, confirming the interface-dominated adsorption mechanism of MgAl-LDH/CNT composites. This work provides a promising strategy for efficient adsorption and separation of U(VI) from natural waters, while offering valuable insights into environmental remediation and sustainable nuclear resource management.
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