CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Yabo Guo,Zhihao Feng,Jiangyi Guo,Lu-Hua Zhang,Fengshou Yu
Electrochemical nitrate reduction reaction (NO 3 RR) is an energy efficient and environmentally friendly technology that removes nitrate compounds from wastewater while producing ammonia as a value-added product. NO 2 − is a crucial intermediate in the electrocatalytic NO 3 RR, and regulating the intermediate adsorption structure is the key to improve the reaction efficiency. However, stabilizing the reaction intermediates by optimizing the catalyst structure remains a great challenge. Herein, We demonstrate copper phthalocyanine (CuPc) anchored on a Mg(OH) 2 -decorated nitrogen-doped carbon composite as an efficient electrocatalyst for NO 3 RR, achieving ambient conditions ammonia synthesis in neutral electrolytes. The incorporation of Mg(OH) 2 induces interfacial electron transfer, creating a charge-redistributed Cu active site that facilitates the adsorption of NO 3 − and reaction intermediates. Moreover, the Mg 2+ sites with negative electrostatic potential (ESP) interact with the oxygen sites exhibiting positive ESP on the critical NO 3 RR intermediate, thereby optimizing the adsorption geometry while enhancing both the stability of the intermediate and its subsequent catalytic conversion. When used for electrochemical NO 3 − reduction reaction (NO 3 RR), the developed CuPc/Mg(OH) 2 /NC exhibits a prominent Faradaic efficiency for NH 3 formation (FE NH3 ) of 98.09 % and NH 3 yield of 12.632 mg h −1 cm −2 .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Feitong Chen,Yulin Fan,Zhuohan Lin,Zhixian Li,Xueqing Qiu,Hongming Lou,Yuxia Pang
This study presents a pH-switchable Fenton-like system based on sulfur-doped FeP synthesized via a confined gas–solid strategy, where ·OH dominates at pH 3.0 and Fe(IV)=O prevails at pH 6.0. Sulfur incorporation modulates the FeP electronic structure by expanding the lattice, enhancing Fe–P covalency, and increasing electron density, thereby promoting charge transfer and reducing the activation barrier for H 2 O 2 activation. The optimized FePS 15 catalyst achieved ~99% sulfamethoxazole degradation (150 mg/L) within 15 minutes, exhibiting a reaction rate 2.54 times higher than that of undoped FeP. When further supported on lignin-derived carbon spheres (FePS 15 @LC), it exhibited enhanced structural integrity, suppressed iron leaching, and improved reusability. These findings demonstrate that sulfur doping drives pH-dependent ROS switching from ·OH to Fe(IV)=O, supporting adaptable Fenton-like catalysis. This work improves mechanistic insight into ROS modulation and enables pH-adaptable advanced oxidation processes for pollutant removal.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Xiaoying Zhou,Shiyu Fang,Tiantian Zhang,Zuliang Wu,Jing Li,Wei Wang,Jiali Zhu,Junliang Wu,Daiqi Ye,Rui Han,Qingling Liu,Shuiliang Yao,Erhao Gao,Dayu Wu
The development of non-noble metal catalysts for low-temperature CO oxidation is a pivotal subject in various disciplines. In this study, an optimized Mn-doped NiO catalyst (Mn-NiO-0.5), prepared via aerosol pyrolysis with an equal molar ratio of Ni to Mn, demonstrates remarkable performance. It achieves an 82 % CO conversion at -20 °C and a 100 % conversion between 10 °C and 800 °C. The catalyst’s turnover frequency ( TOF ) for CO oxidation significantly surpasses that of previously reported noble-metal-based catalysts, underscoring its superior efficiency. Dynamic analyses suggest that the enhanced catalytic activity is a result of the unique atom burr structure, which presents an extensive surface area replete with abundant active sites. This structural feature is instrumental in maximizing the catalyst’s interaction with CO molecules. Experimental findings, corroborated by density functional theory (DFT) calculations, elucidate the mechanism of CO oxidation on the Mn-NiO-0.5 catalyst. The process is facilitated by the synergistic action of bimetallic sites, where the Ni–OH site acts as the primary adsorption point for CO. Subsequently, the CO is oxidized to bicarbonate through the interaction with the oxygen (O or O 2 ) at adjacent Mn sites. This pioneering study introduces a paradigm-shifting insight: the effectiveness of non-noble metal oxide catalysts can now compete with, and in some cases, outperform their noble metal counterparts. This breakthrough is set to transform the industry, presenting a compelling alternative to conventional noble metal catalysts and propelling the evolution of state-of-the-art environmental conservation technologies.
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Sustainable Materials and Technologies
·
2025
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IF 9.2
Dan Xu,Yuwei Hua,Yanyan Huang,Yiming Zhao,Xin Chen,Jingyuan Zhang,Ge Chen,Guangyang Liu,Zhijian Wu,Xiaomin Xu,Donghui Xu
The rapid industrialization and extensive use of synthetic dyes have led to significant environmental pollution, particularly through dye wastewater, which poses severe ecological risks. Conventional single treatment methods often struggle to effectively remove complex and stable dye molecules. In this study, we developed COF-based chitosan hydrogel microspheres by combining COF-LZU1 and Co(OH)₂ via co-precipitation and self-assembly techniques. The synergistic effect between COF and Co(OH)₂ enabled simultaneous adsorption and degradation of neutral red, significantly enhancing the adsorption capacity. Under optimal conditions (15 mg of composite material, 20 min reaction time, pH = 7), the composite exhibited an adsorption capacity of 1325.48 mg/g and a degradation efficiency of 100 %, surpassing the performance of most conventional adsorbents. Furthermore, the incorporation of Co(OH)₂ into COF enhanced the stability of the composite material, as indicated by thermodynamic analysis and adsorption performance across different component ratios. Adsorption process modeling revealed that the adsorption kinetics fit well with the Elovich model, while isothermal adsorption followed the Langmuir model. Among common interfering substances, CH₃COO − was found to enhance the catalytic process, whereas humic acid inhibited it. Quenching experiments and EPR analysis confirmed that superoxide anion radicals (•O₂ − ) and singlet oxygen ( 1 O₂) were the primary active species in the catalytic process, with hydroxyl radicals (•OH) playing a relatively minor role. This study highlights the synergistic interaction of COF and Co(OH)₂ in improving adsorption performance, stability, and catalytic efficiency, providing a novel strategy for the preparation of advanced composite materials and new insights into pollutant removal mechanisms.
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Journal of Energy Storage
·
2025
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IF 9.8
Rongjun Wu,Lisheng Deng,Linfa Xiao,Pei Lu,Shusen Lin,Noriyuki Kobayashi,Mitsuhiro Kubota,Chao Wang,Hongyu Huang,Xianglong Luo
Mg(OH) 2 /MgO-based thermochemical energy storage (TCES) has garnered significant interest for its potential in moderate-temperature long-term thermal energy storage, which is crucial for the stable and efficient utilization of solar energy, due to its high energy storage density, low cost, and non-toxicity. However, its practical applications are limited by agglomeration and sintering issues, which decrease the dehydration/hydration rate and reduce durability. This study focuses on designing a MgO-based composite structure by in-situ casting MgO nanoparticles within the pores of nanoporous carbon (NC). The composites were synthesized by a calcination method. Their TCES performances were tested using a thermogravimetric analysis. The NC, with an average pore size of 14.1 nm, effectively confined the growth of MgO particles within its pores, thereby producing MgO particles with small size and uniform dispersion while maintaining a high proportion of MgO in the composite. Consequently, the composite demonstrated the fastest hydration, achieving a 98.7 % conversion ratio, which was 58.9 % higher than that of pure MgO. Meanwhile, the composite exhibited a high dehydration rate and a large heat storage density of 946.5 kJ/kg. Importantly, the composite showed excellent structural stability and exhibited good durability over 60 cycles, with a slight decrease (6.0 %) in heat storage density, whereas pure MgO showed a decrease of 63.1 %. The high energy storage density and superior durability of the developed composite, compared to existing Mg(OH) 2 /MgO-based materials, make it a promising candidate for TCES applications. This study offers a reference for the rational design of TCES materials with agglomeration inhibition and reaction activity.
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ChemSusChem
·
2025
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IF 6.6
Yue Wang,Han Qin,Xiangming Wang,Feng Yan,Yang Zhao,Xianbo Yu
Graphical A hierarchical heterostructure consisting of amorphous FeNi(OH) X nanosheets electrodeposited on crystalline Ni 3 S 2 scaffolds with abundant catalytic active sites and superior electronic conductivity is reported to enhance its catalytic activity and long-term stability for overall water splitting. The advancement of inexpensive and productive bifunctional electrocatalysts for overall water splitting is essential for achieving hydrogen energy production. Herein, a hierarchical heterostructure catalyst composed of amorphous FeNi(OH) X nanosheets supported on a crystalline Ni 3 S 2 scaffold, which is anchored to nickel foam through a combined hydrothermal-electrodeposition strategy, is reported. The crystalline Ni 3 S 2 framework exhibits metal-like electrical conductivity and optimized hydrogen adsorption kinetics, while the amorphous FeNi(OH) X overlayer offers abundant adaptive active sites that enhance oxygen evolution reaction (OER) activity. The interfacial charge redistribution decreases the activation energy required for water splitting and accelerates the proton-coupled electron transfer process. Electrochemical tests demonstrate that the catalyst achieves performance at a current density of 10 mA cm −2 , with hydrogen evolution reaction (HER) and OER overpotentials as low as 78 and 183 mV, respectively. In addition, an alkaline electrolyzer assembled with this catalyst serving as both cathode and anode can sustain a current density of 10 mA cm −2 with only 1.51 V and keep a long-term stability exceeding 100 h, surpassing the performance of commercial Pt/C||IrO 2 systems. This study provides a design paradigm that integrates conductive crystalline frameworks with amorphous layers, addressing the tradeoff between conductivity and catalytic multifunctionality in nonprecious metal electrocatalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Haoran Jiang,Yong Hu,Wu Xu,Ziwen Dong,Song Kong
Cellulose-based paper, widely used in cultural heritage preservation and art, suffers from inherent flammability. Conventional phosphorus-based flame retardants, derived from depleting phosphate ores, necessitate sustainable alternatives. This study introduces an innovative layer-by-layer assembly strategy to fabricate biomass-derived MH-P@Mn and MH-P@Ni core-shell flame retardants. Phytic acid, a biogenic phosphorus source, chelates metal ions (Mn 2+ /Ni 2+ ) to form stable coatings on magnesium hydroxide. When applied to cellulose paper, these materials exhibit superior flame-retardant performance compared to commercial phosphorus-based counterparts, particularly at medium-to-high loadings. Mechanistically, they enhance inert gas emission during pyrolysis, delaying thermal degradation. The mild, rapid synthesis enables development of eco-friendly, multifunctional cellulose paper with enhanced fire resistance and sustainable phosphorus utilization, promising diverse applications.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Hong Jia,Mengyang Wang,Mengyao Feng,Guangzhi Li,Longhua Li,Yu Liu
Constructing heterostructures with nanotube arrays not only provides rich ion electron pathways to promote rapid Faraday reactions, but also enhances interfacial electron transfer, supplying larger capacitance and rapid energy storage. Herein, NiCo-layered double hydroxide (LDH)/NiCo 2 S 4 nanotube arrays decorated with black phosphorus quantum dots (BPQD) is prepared through solvothermal method and electrostatic adsorption. In the unique structure, tubular structure of NiCo-LDH/NiCo 2 S 4 /BPQD nanoarrays on carbon cloth can expose sufficient redox reaction active sites and multiple ion diffusion channels to promote rapid faradic reactions. Density functional theory (DFT) theoretical calculations further confirm the enhancement of conductivity and OH – adsorption in ternary composite materials. The as-obtained NiCo-LDH/NiCo 2 S 4 /BPQD achieves an ultra-high capacitance of 2938.2F g −1 at 1.0 A g −1 . Finally, an asymmetric supercapacitor consists of activated carbon and NiCo-LDH/NiCo 2 S 4 /BPQD exhibits a satisfactory energy density of 133.7 Wh kg −1 at 800 W kg −1 . In addition, after 10,000 repetitions of charging/discharging, the capacitance still remains 76.5 %. Above results suggest that NiCo-LDH/NiCo 2 S 4 /BPQD electrode may facilitate the further development of hierarchical array structure electrodes in the energy storage field.
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Journal of Water Process Engineering
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2024
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IF 6.3
Hongwei Wang,Xianliang Ren,Fang Wu,Gaobin Liu,Shufang Zhang,Haijun Luo,Zhiqin Zheng,Liang Fang
MXenes have demonstrated exceptional potential in the adsorption of uranium (U(VI)) from wastewater. However, significant challenges remain in the investigation of its adsorption capacity and mechanism. To enhance the adsorption capacity of Ti 2 CT x , this study conducted alkalization experiments on Ti 2 CT x and subsequently prepared Ti 2 C(OH) 0.13 @SA aerogel spheres by combining alkalized Ti 2 C(OH) 0.13 with sodium alginate (SA). The results indicated that alkalization effectively increased the proportion of OH functional groups. After alkalization treatment, Ti 2 C(OH) 0.13 exhibits a significantly enhanced adsorption capacity, reaching up to 951 mg g −1 , which represents more than a twofold increase compared with untreated Ti 2 CT x . The adsorption follows pseudo-second-order kinetics and the Langmuir isotherm model, suggesting chemical and monolayer adsorption, respectively. Thermodynamic studies reveal an endothermic adsorption process. DFT calculations demonstrate that the OH functional group forms chemical bonds with U(VI), promoting reductive adsorption. Aside from electrostatic adsorption, XPS analysis confirms Ti(II) oxidation and U(VI) reduction. This study further investigates the adsorption capacity of Ti 2 C(OH) 0.13 @SA aerogel spheres in simulated seawater environments. It is found that even at an ultra-low concentration of U(VI) as low as 3.3 μg/L, these aerogel spheres still exhibit significant adsorption performance, with an adsorption capacity reaching up to 3.21 mg g −1 , highlighting their substantial potential for applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Baolai Wang,Kaili Wei,Fuming Chen,Yinzhen Wang,Guannan He,Wei Li,Junming Liu,Qinyu He
It has been found it more difficult in completely degrading A-ring of tetracycline (TC) than completely degrading B-D rings of tetracycline. Thus, it is very necessary to find an effective route to completely degrading A-ring of tetracycline. In this work, a Z-scheme heterojuncted core-shell La(OH) 3 @BaTiO 3 composite (LB) was designed and fabricated through hydrothermal method . Many characterization techniques were employed to investigate the microstructure, phases, composition, energy band structure , and the lifetime of photogenerated carriers. In the mean time, the photocatalytic properties, including the degradation of A-ring and B-D rings of TC, as well as active species during photo-degradation were investigated. It is found that the as-prepared LB has an improved lifetime of photo-produced carriers, as well as high photocatalytic properties, being attributed to the core-shell structured heterojunction La(OH) 3 @BaTiO 3 . In addition, it is also found that ·O 2 − is more effective on degrading A-ring of TC than other active species, likely owed to the PKa3 value (3.3) of A-ring in TC. This work has supplied a route to completely degrading the A-ring of TC: rationally design and prepare a Z-scheme heterojuncted composites which supply very negative conduction band bottom potential.
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-13
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IF 14.919
Ji Xixi,Lin Yanhong,Zeng Jie,Ren Zhonghua,Lin Zijia,Mu Yongbiao,Qiu Yejun,Yu Jie
Development of excellent and cheap electrocatalysts for water electrolysis is of great significance for application of hydrogen energy. Here, we show a highly efficient and stable oxygen evolution reaction (OER) catalyst with multilayer-stacked hybrid structure, in which vertical graphene nanosheets (VGSs), MoS 2 nanosheets, and layered FeCoNi hydroxides (FeCoNi(OH) x ) are successively grown on carbon fibers (CF/VGSs/MoS 2 /FeCoNi(OH) x ). The catalyst exhibits excellent OER performance with a low overpotential of 225 and 241 mV to attain 500 and 1000 mA cm −2 and small Tafel slope of 29.2 mV dec −1 . Theoretical calculation indicates that compositing of FeCoNi(OH) x with MoS 2 could generate favorable electronic structure and decrease the OER overpotential, promoting the electrocatalytic activity. An alkaline water electrolyzer is established using CF/VGSs/MoS 2 /FeCoNi(OH) x anode for overall water splitting, which generates a current density of 100 mA cm −2 at 1.59 V with excellent stability over 100 h. Our highly efficient catalysts have great prospect for water electrolysis.
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Nanomaterials
·
2022
·Vol. 12
·期 21
·3771
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IF 5.719
Shizhuo Wang,Jikang Jiang,Minyan Gu,Yuanbo Song,Jiang Zhao,Zheng Shen,Xuefei Zhou,Yalei Zhang
To substitute fossil resources, it is necessary to investigate the conversion of biomass into 1,2-propanediol (1,2-PDO) as a high-value-added chemical. The Pt/deAl-Beta@Mg(OH)2catalytic system is designed to obtain a higher 1,2-PDO production yield. The optimal yield of 1,2-PDO is 34.1%. The unique shell-core structure of the catalyst demonstrates stability, with a catalytic yield of over 30% after three times of use. The primary process path from glucose to 1,2-PDO, glucose-hexitol-1,2-PDO, is speculated by the experiments of intermediate product selectivity. The alkaline catalytic mechanism of the reaction process is elucidated by studying catalyst characterization and analyzing different time courses of products. The introduction of Mg(OH)2improves the target yield by promoting the isomerization from glucose to fructose and retro-aldol condensation (RAC) conversion, with pseudo-yield increases of 76.1% and 42.1%, respectively. By studying the processes of producing lactic acid and 1,2-PDO from glucose, the glucose hydrogenolysis flow chart is improved, which is of great significance for accurately controlling 1,2-PDO production in industrial applications. The metal, acid, and alkali synergistic catalytic system constructed in this paper can provide a theoretical basis and route reference for applying biomass conversion technology in practice.Keywords:1,2-propanediol;alkaline modification;core–shell catalyst
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