WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 10
·1-14
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IF 3
Liu Jingliang,An Fengxia,Zheng Di,Li Chao,Sun Jingya
In this study, Mn-Ni-layered double hydroxides (Mn-Ni-LDHs) were synthesized and utilized to activate peroxymonosulfate (PMS) for degrading reactive brilliant blue KN-R (KN-R) in aqueous solutions. The characterization results demonstrate that the catalysts synthesized are layered structures, and the surface area is 169.3 m 2 /g. The Mn-Ni-LDHs exhibited significant efficiency effective for the degradation of KN-R via activating PMS, achieving 96.5% degradation of KN-R within 90 min under optimal conditions (0.20 g/L catalyst, 10 mM PMS, pH=10.0 and 25°C). The reaction followed pseudo-first-order kinetics with a rate constant of 0.0351 min -1 , and the apparent activation energy was calculated to be 11.94 kJ/mol. Electron paramagnetic resonance (EPR) and free radical scavenging experiments identified ·O 2 − and 1 O 2 as the primary reactive species involved in the reaction for KN-R degradation. The proposed catalytic mechanism suggests that redox cycling between Mn 4+ /Mn 3+ and Ni 3+ /Ni 2+ within Mn-Ni-LDHs plays a critical role in enhancing PMS activation, thereby promoting the continuous generation of active oxygen species.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Zhaomin Lu,Guang Li,Kuang Sheng,Ting Wu,Wenwen Luo,Hu Zhou,Qingfeng Yi
Further enhancing the electrocatalytic performance of transition metal sulfides for oxygen evolution and oxygen reduction reactions (OER and ORR) is crucial for the development of high-efficiency electrochemical energy devices. Here, the highly efficient iron-doped nickel sulfide/cobalt sulfide heterostructure catalyst (Fe-NiS 2 /CoS 2 ) was successfully prepared via a combination of hydrothermal-sulfidation-reduction strategy. Physical characterizations coupled with electrochemical tests reveal that Fe doping plays a key role in the excellent performance of Fe-NiS 2 /CoS 2 by lowering charge transfer resistance, optimizing electronic structure, and promoting reaction kinetics synergistically. As a result, the Fe-NiS 2 /CoS 2 catalyst exhibits a bifunctional electrocatalytic reactivity with a low ΔE of 0.61 V, surpassing noble-metal-based catalyst and most of the reported iron-related sulfide bifunctional catalysts. Specifically, the catalyst exhibits low overpotentials of 265 mV at 10 mA cm −2 and 381 mV at 100 mA cm −2 for the OER, while maintaining an ORR E 1/2 of 0.88 V. Aqueous zinc-air battery (ZAB) based on Fe-NiS 2 /CoS 2 achieve the specific capacities of 678.5 mAh g Zn −1 and along with 200 h cycling stability. This work provides an effective approach to improving transition metal sulfides, with potential for broader application in OER/ORR-related energy technologies.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Xiaoxue Cheng,Chenchen Li,Qifan Ling,Xinyu Wang,Jiangshan Zhang,Kexin Zhang,Naparat Kasetsomboon,Shuang Wang,Ding Jiang
Vanillonitrile (VN), a valuable pharmaceutical intermediate, is traditionally synthesized through toxic cyanide-based routes. Herein, we report a green, two-step approach for VN synthesis starting from vanillin (VL), a lignin-derived platform molecule. The process integrates solvent-assisted condensation and catalytic pyrolysis, supported by mechanistic insights from density functional theory (DFT). In the first step, vanillin azine (VA) is selectively synthesized in ethanol, with solvent polarity and noncovalent interactions governing reaction kinetics and selectivity. Pyrolysis experiments and quantum chemical calculations reveal that hydrogen-transfer-induced N–N bond cleavage is the dominant route for VA conversion. A heterostructured Ni/NiO@CN catalyst featuring interfacial Ni–N sites was developed to lower activation energy and promote electron redistribution, enhancing VN selectivity to 57.2%. Surface potential and spin polarization analysis further confirmed efficient electron transfer pathways. This work provides a sustainable and efficient route to nitrogen-containing fine chemicals from renewable lignin and offers mechanistic guidance for future biomass-based catalytic designs.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Adil Shafi Ganie,Shahid Hussain,Aadil Ahmad Bhat,Zhenyu Miao,Talib K. Ibrahim,Xiangzhao Zhang,Mohammed Mujahid Alam,Abdullah G. Al-Sehemi,Rajesh Kumar Manavalan,Guanjun Qiao,Guiwu Liu
The continuous release of harmful gases and increased industrial activities has made environmental monitoring essential for evaluating their impact on human health and ecosystem. In this study, a spherical nanostructure of Nickel (Ni) doped CeO 2 was derived from hydrothermally synthesized cerium-based metal-organic framework (Ce-MOF) via MOF encapsulation-calcination method for ultrasensitive detection of H 2 S at ppb level. The physical characterizations and microstructure of the Ni-CeO 2 composite revealed porous surface with a hollow spherical framework structure. The H 2 S gas-sensing performance of CeO 2 increased with Ni doping and exhibited remarkable sensitivity up to 100 ppb at low operational temperature. Notably, Ni-CeO 2 -6 composite shows an improved response of 108 (R a /R g ) at an operational temperature of 100°C. Furthermore, NC-6 displays good linearity (R 2 =0.998) towards H 2 S concentration with a low detection limit (8.68 ppb). The composite nanostructure shows good humid tolerance with minimum response deviation (6 %), on increasing the relative humidity (RH) from 15 % to 60 % at room temperature. In addition to this, the composite nanostructure shows excellent selectivity towards H 2 S, combined with good repeatability, and sustained stability. The enhanced response of Ni-doped CeO 2 can be correlated with increased surface area, porous morphology, and reactive oxygen sites on the surface. The study reveals the synergistic interplay of MOF-derived framework and Ni doping for increasing oxygen vacancies and enhancing the surface reactivity for improved gas-sensing performance.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Ting Wu,Jianpeng Sun,Zhan Zhao,Kelei Huang,Xiangchao Meng
Modulation of d-band center of Ni to achieve an equilibrium between H-adsorption and Hdesorption (H ads /H des ) remains a great challenge. Herein, Ni@C derived from MOFs was treated by ultraviolet light. It was found that sp 2 edge carbon were converted to sp 3 defective carbon and further combined with Ni clusters. Experimental and theoretical calculations confirmed that the enhanced d-p orbital hybridization between C-Ni promoted a large negative shift of the dband center of Ni, which was in favor of improving the HER activity of the catalyst. Moreover, the core-shell structure of carbon-coated Ni effectively protected the Ni sites and improved its catalytic stability when applied in electrocatalytic water splitting. As a result, as-prepared UV-Ni@C/NF exhibited excellent HER activity in both alkaline aqueous solution (overpotential of 309 mV at 1000 mA cm -2 ) and acidic aqueous solution (overpotential of 446 mV at 1000 mA cm -2 ). This study indicated the UV-illumination-induced defects method as a feasible strategy to precisely regulate the d-band center of Ni.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yi-Lin Zhao,Lu-Hui Li,Li-Na Zhu,Xin Wang
Hydrogen peroxide (H₂O₂) is a crucial oxidative stress biomarker associated with various diseases, especially tumor progression and inflammatory disorders. Accurate monitoring of H₂O₂ is essential for understanding the microenvironmental dynamics involved in disease development. However, traditional metal oxide-based electrochemical sensors often suffer from low catalytic efficiency and nanoparticle aggregation. Herein, we report a high-performance, binder-free H₂O₂ sensor based on a rationally engineered Au–CoMn₂O₄/Ni foam heterostructure. This integrated architecture leverages the conductive 3D Ni foam and an interface-mediated interaction-enhanced charge transfer interface to significantly enhance sensing performance. The resulting sensor exhibits two sensitivities, 3100.04 μA·mM⁻¹·cm⁻² (2–666 μM) and 821.41 μA·mM⁻¹·cm⁻² (1.066–22.166 mM), an ultralow detection limit of 0.036 μM, and a practical linear detection range spanning 2 μM–22.166 mM (R² = 0.99). It also demonstrates excellent selectivity, long-term stability (<3% signal decay over 30 days), and reproducibility (RSD ≈ 2.5%). Notably, the sensor enables real-time electrochemical monitoring of H₂O₂ released by A549 lung cancer cells under phorbol 12-myristate 13-acetate (PMA) stimulation, highlighting its potential as a platform for advanced electrochemical sensing. Importantly, the sensing mechanism can be well interpreted via interfacial structure analysis and electrochemical validation, without requiring theoretical simulations.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Yongyan Xue,Jing Chen,Jinglin Gou,Jie Yang,Tuoping Hu,Jingjing Jiao,Xiao-Qing Wang
Achieving clean hydrogen energy requires the logical development of stable, high-performance, and inexpensive hydrogen evolution reaction (HER) electrocatalysts. Herein, a range of Ni-MOF@MoS 2 -X/NF (X = 0.05, 0.06, 0.10, 0.15, 0.20) heterogeneous electrocatalysts were constructed by anchoring MoS 2 nanosheets onto the surface of nickel-based metal-organic framework (Ni-MOF) material self-supported on nickel foam (NF) via weak interactions under a two-step solvothermal method, which exhibited flower-like microspheres with interconnected nanosheets. Compared with Ni-MOF/NF, Ni-MOF@MoS 2 -X/NF (X = 0.05, 0.06, 0.10, 0.15, 0.20) show prominent HER electrocatalytic property in 1.0 M KOH solution. Specifically, the optimal Ni-MOF@MoS 2 -0.15/NF exhibits better HER electrocatalytic property than the Pt/C catalyst, which has a lower overpotential of only 25 mV with the Tafel slope of 54.68 mV dec −1 at a current density of 10 mA cm −2 in alkaline solution. Furthermore, in natural seawater, an overpotential of 90 mV was required to drive the HER process at a current density of 10 mA cm −2 . The 60 h stability tests of Ni-MOF@MoS 2 -0.15/NF in natural seawater and 1.0 M KOH showed excellent endurance. Density functional theory (DFT) calculations indicate that the ΔG H∗ of Ni-MOF@MoS 2 (0.50 eV) is lower than that of Ni-MOF (0.96 eV). This work presents a novel approach to constructing effective HER catalysts made of non-precious metals in natural seawater.
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Batteries-Basel
·
2025
·Vol. 11
·期 9
·342
·
IF 4.8
Wei Cao,Chenhan Xiong,Yanqiu Yu,Xiang Ji,Hao Xu,Ziwei Chen,Jun Chen,Rui Wang
Nickel–zinc batteries are promising candidates for safe, cost-effective, and high-power energy storage. However, the poor cycling stability of zinc anodes, mainly caused by dendrite growth and dissolution, remains a major challenge for their practical application. Herein, carbon-coated nano-ZnO (ZnO@C) composites were synthesized via a sol–gel method using polyvinyl alcohol (PVA) and zinc acetate as precursors. By systematically tuning the carbon content, the ZnO@C-6 sample with a carbon-to-ZnO mass ratio of 1:6 exhibited the best structural and electrochemical performance. Characterization confirmed a uniform amorphous carbon layer that enhanced conductivity and inhibited ZnO dissolution. Electrochemical tests demonstrated that ZnO@C-6 exhibited high reversible capacity (500 mAh g−1at 12 C after 1000 cycles), coulombic efficiency (>80%), and superior rate capability up to 30 C. Post-cycling SEM confirmed that the carbon coating effectively inhibits dendrite formation and preserves electrode morphology. These findings highlight the critical role of carbon coatings in stabilizing ZnO-based anodes and offer a viable pathway toward high-performance Ni-Zn batteries.
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Journal of Materials Research and Technology-JMR&T
·
2024
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IF 6.2
Shuxin You,Shilong Xing,Chuanhai Jiang
The synergistic mechanism of microparticles and nanoparticles on optimizing microstructures homogeneity and enhancing microhardness and corrosion resistance of mixed coatings was deeply researched by co-electrodepositing CeO 2 microparticles and CeO 2 nanoparticles into nickel matrix. Microparticles contribute to enhancing the microhardness of the coating, while nanoparticles promote the homogeneity of the microstructure, thereby improving the corrosion resistance of the coating. Therefore, by co-electrodepositing microparticles and nanoparticles into the nickel matrix, microparticles and nanoparticles in the nickel matrix generate a synergistic optimization effect, combining the advantages of microparticles and nanoparticles. Microparticles are mainly responsible for enhancing the microhardness of the coating, while nanoparticles are responsible for promoting the homogeneity of the microstructure in the coating, maintaining a homogeneous distribution of microhardness, and improving the corrosion resistance of the coating. Ultimately, the mixed coating achieves both high microhardness and excellent corrosion resistance, along with homogeneous microhardness distribution.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2024
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IF 8
Rujiao Jiang,Baojun Yi,Qi Wei,Zhi He,Zhengshuai Sun,Jiayi Yang,Wenbin Hua
The use of Ni-based catalysts is a common method for eliminating tar through catalytic cracking. Carbon deposition is the main cause of deactivation in Ni/ZSM-5 catalysts, with filamentous MWCNTs being the primary form of carbon deposits. This study investigates the formation and evolution of CNTs during the catalytic process of biomass tar to explore the mechanism behind carbon deposition. The effect of the 9Ni/10MWCNTs/81ZSM-5 on toluene reforming was investigated through a vertical furnace. Gases produced by tar catalysis were evaluated through GC analysis. The physicochemical structure, properties and catalytic performance of the catalyst were also tested. TG analysis was used to assess the accumulation and oxidation reactivity of carbon on the catalyst surface. An analysis was conducted on the mechanism of carbon deposition during catalyst deactivation in tar catalysis. The results showed that the 9Ni/91ZSM-5 had a superior toluene conversion of 60.49%, but also experienced rapid and substantial carbon deposition up to 52.69%. Carbon is mainly deposited as curved filaments on both the surface and pore channels of the catalyst. In some cases, tip growth occurs where both carbon deposition and Ni coexist. Furthermore, specific surface area and micropore volume are reduced to varying degrees due to carbon deposition. With the time increased, the amount of carbon deposited on the catalyst surface increased to 62.81%, which gradually approached saturation, and the overall performance of the catalyst was stabilized. This situation causes toluene molecules to detach from the active sites within the catalyst, hindering gas release, which leads to reduced catalytic activity and further carbon deposition. It provides both a basis for the development of new catalysts and an economically feasible solution for practical tar reduction and removal.
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PubMed
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Junjie Su,Qi Yang,Zhihu Zhang,Ziyue Zhang
Nowadays, Ni/Fe bimetallic nanocomposites have shown great potential for removing Cr(VI). However, the action of Ni 0 in Cr(VI) removal is still controversial, which was studied in this work. In this study, Ni/Fe@Fe 3 O 4 -g-C 3 N 4 (NFFOCN) nanocomposites were applied to remove Cr(VI) from aqueous solutions and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. Batch experiments were conducted to evaluate the Cr(VI) removal performance. Experimental results demonstrated that under optimal operating conditions (pH 5.5, 10 mg/L Cr(VI), 0.3 g/L NFFOCN, 30°C), a Cr(VI) removal efficiency of 90.78% was achieved within 50 min. Theoretical maximum adsorption capacity was calculated to be 36.101 mg/g. Combining experimental and characterization results, it could be concluded that Cr(VI) removal was attributed to the synergistic effect of the NFFOCN components. Ni 0 not only participated directly in the reduction of Cr(VI) as an electron donor, but also converted the corrosion product H 2 of nano-zero-valent iron (nZVI) into highly reducible atomic hydrogen (·H) to remove Cr(VI). Additionally, Ni 0 could form a primary battery with nZVI, facilitating the electron transfer between nZVI and Cr(VI). NZVI and its derivatives, Fe 2+ ions and green rust, were responsible for Cr(VI) reduction. Furthermore, the presence of Fe 3 O 4 and carbon nitride (g-C 3 N 4 ) improved the stability and reactivity of the nanocomposites.
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CHINESE CHEMICAL LETTERS
·
2024
·
IF 9.4
Junyi Yu,Yin Cheng,Anhong Cai,Xianfeng Huang,Qingrui Zhang
Herein, the Cu(III) synthesized from copper plating effluent was developed for the first time to evaluate the onsite degradation performance of heavy metal complexes in the wastewater, thus achieving the purpose of “treating waste with waste”. The results indicated that synthetic Cu(III) presented the excellent decomplexation performance for Cu(II)/Ni(II)-organic complexes. The removal efficiency of Cu(II)/Ni(II)-EDTA significantly increased with increasing Cu(III) dosage, and the degradation of Cu(II)/Ni(II)-EDTA by synthetic Cu(III) system displayed highly pH-dependent reactivity. The radical quencher experiments confirmed that Cu(III) direct oxidation were mainly involved in the degradation of Cu(II)-EDTA. Additionally, the continuous decarboxylation process was proven to be the main degradation pathway of Cu(II)-EDTA in Cu(III) system. The coexisting substances (SO 4 2− , Cl − and fulvic acids) showed little impacts at low level for the removal of Cu(II)/Ni(II)-EDTA, while retarded the degradation of Cu(II)-EDTA slightly at high level, which features high selective oxidation. Encouragingly, it was also effective to remove Cu(II)/Ni(II)-EDTA from in treating actual Cu/Ni-containing wastewater through synthetic Cu(III) treatment.
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