Article
Green & Sustainable Science & Technology
Shadpour Mallakpour, Zohreh Amini
Summary: This research focuses on the green synthesis of a silver nanoparticle-based nano-catalyst for reducing 4-nitrophenol pollutants. The use of natural extract of green tea instead of chemical reductant is explored. Layered double hydroxides (LDHs) and chitosan (CS) are used to enhance catalytic activity and reusability of the nano-catalyst. The prepared CS/Ag-LDH NC film shows high efficiency in reducing 4-nitrophenol.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Peicheng Jiang, Wenyuan Guo, Jin Peng, Wei Peng, Huiyong Li, Chang Peng, Shu Chen
Summary: Researchers prepared a novel transition metal carbidessupported bimetallic Ag/Cu nanoparticles composite (Ag/Cu/MXene) catalyst by one-pot reduction method. The MXene carrier effectively promoted the riping and immobilization of bimetallic Ag/Cu nanoparticles. The composite catalyst showed high catalytic activity for the reduction of 4-nitrophenol (4-NP) due to improved electron transfer capacity, with a turnover frequency (TOF) of 1127.2 h-1.
Article
Chemistry, Inorganic & Nuclear
Xiaokun Wang, Luyao Xin, Xiangqing Li, Lixia Qin, Taiyang Zhang, Shi-Zhao Kang
Summary: Rapid restoration of sea water with high concentration of 4-nitrophenol is necessary during a pollution incident. Rice-like WO2.92/Bi2WO6 nanoparticles were prepared and their catalytic activity was explored. The as-prepared sample showed high efficiency in the fast restoration of highly concentrated 4-nitrophenol effluent. When used in sea water, the removal efficiency of 4-nitrophenol reached 100% within 8 minutes. Our work provides new insights for designing an efficient catalyst for the rapid removal of highly concentrated 4-nitrophenol from sea water.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Hele Guo, Abc Yali, Hongliang Dong, Wei Zong, Kaibin Chu, Weiwei Li, Zhongli Fan, Guanjie He, Yue-E Miao, Ivan P. Parkin, Feili Lai, Tianxi Liu
Summary: In this study, ultrafine PtRh alloy nanoparticles were successfully prepared using an organic molecular cage (OMC) confinement strategy. The nanoparticles were imprisoned in the cavities of a reduced chiral covalent imine cage (RCC3), which acted as a homogenizer in solution. The RCC3, acting as an electron-acceptor, improved the catalytic activity of Pt atoms. Due to the synergistic effect of Pt/Rh atoms and the unique function of the RCC3, the reaction rate constants of Pt1Rh16@RCC3 were significantly higher than those of bulk Pt1Rh16, Pt@RCC3, and Rh@RCC3. This work presents a feasible strategy for homogenizing heterogeneous alloy nanoparticle catalysts in solution, with great potential for advanced catalytic applications.
Article
Engineering, Electrical & Electronic
Krishnasamy Lakshmi, Ragunathan Jayashri, Krishna Kadirvelu
Summary: Increased industrial activity has resulted in the release of large quantities of phenolic compounds and their derivatives into the environment, with 4-nitrophenol being particularly harmful to human organs. A newly developed fluorescent nanocomposite CQDs@CeO2 shows exceptional properties and has high efficiency in reducing 4-nitrophenol.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Gongshu Wang, Zhuang Hu, Zhangpei Chen, Jiwei Wang, Jianshe Hu, Xiaoxu Xu
Summary: Developing efficient and recoverable palladium catalysts is important. In this study, nitrogen-doped macroporous chitosan carbon microspheres (MCM) were prepared using emulsion polymerization, and core-shell structured MCM@Pd@COF catalysts were developed. These catalysts efficiently catalyzed Suzuki coupling reactions and the reduction of 4-nitrophenol, and showed high stability and photocatalytic properties under visible light irradiation. Mechanistic investigation revealed the efficient production of radical species under visible light, driving the photocatalytic degradation of organic dyes. The catalytic activity of MCM@Pd@COF remained unchanged after multiple uses.
APPLIED SURFACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Yoshihiro Chida, Takeru Tomimori, Tomoaki Ebata, Noboru Taguchi, Tsutomu Ioroi, Kenta Hayashi, Naoto Todoroki, Toshimasa Wadayama
Summary: This study proposes an experimental platform to investigate the relationship between surface nanostructures and properties of high-entropy alloy electrocatalysts. High-entropy alloys have gained attention for improving performance of electrocatalysts. Understanding the relationship between surface atomic-level structures and catalytic properties is crucial for developing new catalysts. The platform allows the vacuum synthesis of atomic-level-controlled single-crystal high-entropy alloy surfaces and evaluation of their catalytic properties.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Lin-Yan Zhang, Yu-Mei Bao, Yan-He Chen, Qing Zhang, Na Zhang, Jian-Yong Zhang, Zhen-Jiang Liu
Summary: In the p-n junction of Co/Cu-ZIF/Fe2O3, electrons flow from n-type Fe2O3 to p-type bimetallic Co/Cu-ZIF, resulting in band bending and an inner electric field. Density function theory calculations showed that this change in electronic properties could enhance water oxidation performance. Experiments demonstrated that the Co/Cu-ZIF(1/1)/Fe2O3 heterojunction achieved a low overpotential and small Tafel slope, outperforming monometallic Co-ZIF and FC substrate. Furthermore, the p-n junction promoted the electrocatalytic degradation of 4-nitrophenol with high removal rate and low energy consumption. Therefore, MOFs-based p-n junctions with electron configuration modulation hold promise for boosting electrochemical water oxidation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Environmental Sciences
Xuan Zhou, Xuefeng Bai
Summary: PdCu alloy nanocatalysts supported on NiFe layered double hydroxide (PdCu-LDHs) were prepared by a green ultrasound-assisted reduction method. The action of ultrasound dissociated hydroxyl groups on the surface of LDHs to reduce Cu2+ and Pd2+ to Cu-0 and Pd-0, promoting the synergy between Pd alloy and LDHs. The electronic effects between Cu and Pd improved the catalytic performance and stability of PdCu-LDHs for the reduction reaction of 4-NP.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Xiaogang Liao, Lin Zheng, Qi He, Gang Li, Li Zheng, Hongmei Li, Tian Tian
Summary: The Ag/TiO2 monolithic membrane catalyst showed excellent catalytic performance and high stability in 4-NP degradation, maintaining degradation rates above 73% after six consecutive recycling runs. This promising material is highly active and easy to recover, making it a potential candidate for 4-NP degradation.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Chemical
Degui Li, Tong Liu, Yujia Luo, Xiangqun Zhuge, Kun Luo, Zhihong Luo, Xiaoteng Liu, Kui Zhang
Summary: We demonstrate a simple route to recycle gold nanoparticle (Au NP) catalysts by altering surface wettability. The hydrophilic Au NPs were used to catalyze the reduction of 4-nitrophenol (4-NP) and then separated from the suspension by interfacial ligand exchange. The catalyst was regenerated through reversible ligand exchange.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Applied
Tamara S. Kharlamova, Margarita V. Salina, Valery A. Svetlichnyi, Mikhail A. Salaev, Andrey I. Stadnichenko, Grigory V. Mamontov
Summary: This study focuses on the design of ceria-supported Pt-Ag bimetallic catalysts for the reduction of 4-nitrophenol. The addition of silver to platinum and the conditions used for bimetallic catalyst treatment can enhance catalyst activity. The optimal Pt:Ag ratio depends on the sample pretreatment and can impact the catalyst's activity.
Article
Nanoscience & Nanotechnology
Yali Liu, Hongliang Dong, Haowei Huang, Wei Zong, Yue-E Miao, Guanjie He, Ivan P. Parkin, Feili Lai, Tianxi Liu
Summary: Encapsulating gold nanoparticles in soluble porous organic cages stabilizes their size and enhances the catalytic reduction performance of 4-nitrophenol. Electron deficiency and lower energy barriers promote electron transfer during the hydrogenation process.
ACS APPLIED NANO MATERIALS
(2022)
Article
Engineering, Chemical
Li Hu, Xingyan Liu, An Guo, Jie Wu, Yi Wang, Yan Long, Guangyin Fan
Summary: In this study, a cobalt@porous carbon nanosheets catalyst was synthesized through a salt-template method, and it exhibited excellent performance in the destruction and reduction of 4-nitrophenol. The catalyst showed efficient activation of peroxymonosulfate at low temperature and demonstrated remarkable catalytic activity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Environmental Sciences
Suryun Oh, Hayoung Yu, Yosep Han, Hyeon Su Jeong, Hye-Jin Hong
Summary: In this study, a CNF/PEI-Cu aerogel was developed as an effective catalyst for degrading 4NP wastewater, demonstrating strong potential as practical and economical catalysts.
Article
Chemistry, Physical
Ankur Kumar, Sasanka Deka
APPLIED CATALYSIS A-GENERAL
(2020)
Article
Chemistry, Physical
Lakshya Kumar, Meenakshi Chauhan, Purna K. Boruah, Manash R. Das, S. A. Hashmi, Sasanka Deka
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Chemistry, Physical
Bindu Antil, Lakshya Kumar, Ravi Ranjan, Sulakshana Shenoy, Kartick Tarafder, Chinnakonda S. Gopinath, Sasanka Deka
Summary: The study presents a unique one-dimensional vermicultar rope-like graphitic carbon nitride nanostructure with abundant channels, high nitrogen content, and rich electroactive sites, enabling highly effective hydrogen evolution reaction.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Lakshya Kumar, Bindu Antil, Ankur Kumar, Manash R. Das, Sasanka Deka
Summary: In this study, a one-pot colloidal approach was used to synthesize a one-dimensional non-noble metal FeCoP electrocatalyst with rod-shaped morphology. The FeCoP electrocatalyst exhibited excellent oxygen evolution reaction (OER) activity and superior stability, making it a promising candidate for OER applications. Mechanistic insights into the OER performance of FeCoP nanorods were obtained through extensive characterization and analysis.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Bindu Antil, Lakshya Kumar, Manash R. Das, Sasanka Deka
Summary: Metal-organic frameworks (MOFs) with well-defined and tailorable porous structures, high surface areas, and inherent semiconductor-like behavior have emerged as potential photocatalysts. However, their photocatalytic H-2 evolution reaction is still limited. Researchers have developed a novel non-noble-metal cocatalyst and loaded it into ZnCo-MOF, significantly improving the H-2 production rate.
ACS APPLIED ENERGY MATERIALS
(2022)
Review
Chemistry, Inorganic & Nuclear
Sasanka Deka
Summary: Supercapacitors have various applications in daily life and are crucial in supplementary electrochemical energy storage technologies along with batteries and fuel cells. They are used as power sources in portable electronics, automobiles, power backup, medical equipment, and more. This review focuses on the synthesis and electrochemical energy storage behavior of morphology-oriented transition metal oxide and mixed transition metal oxide nanoparticles, as well as the development of flexible and bendable supercapacitor devices based on these mixed transition metal oxides.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Ankur Kumar, Javed Muhommad, Siddhartha K. Purkayastha, Ankur K. Guha, Manash R. Das, Sasanka Deka
Summary: A newly developed transition metal boron amorphous alloy electrocatalyst can improve the efficiency of electrochemical water splitting by reducing the energy consumption of the oxygen evolution reaction (OER).
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Ankur Kumar, Siddhartha K. Purkayastha, Ankur K. Guha, Manash R. Das, Sasanka Deka
Summary: A nanoarchitecture composed of NiCu alloy on Co nanosheets was developed and used as an efficient electrocatalyst for HER, OER, and overall water splitting. The optimized catalyst displayed excellent activities with low overpotentials, Tafel slopes, and high mass activities, turnover frequencies, and exchange current densities. It achieved a current density of >1000 mA cm(-1) at low voltage in the electrolyzer, surpassing the commercial IrO2||Pt/C catalyst. The proposed mechanisms were supported by experimental and computational studies, revealing the involvement of nanoporous Cu-rich alloy and (100) surface exposed Co nanosheets as active sites for HER and OER, respectively.
Article
Nanoscience & Nanotechnology
Dharmendra Kumar Yadav, Javed Muhommad, Sasanka Deka
Summary: A two-step synthetic strategy was developed to produce porous nanostructured ZnCoNi-LDH nanosheets from bimetallic MOFs through a chemical reduction method. The optimized composition exhibited the best charge storage ability and specific capacitance. After 10,000 continuous charge-discharge cycles, the device retained 86% of its capacitance and delivered a high-capacitance-specific Coulombic efficiency.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Lakshya Kumar, Bindu Antil, Ankur Kumar, Manash R. Das, Omar Lopez-Estrada, Samira Siahrostami, Sasanka Deka
Summary: In this study, novel nonprecious transition-metal phosphide nanoparticles were developed as efficient electrocatalysts for hydrogen and oxygen evolution reaction and overall water splitting. The surface chemistry of these nanoparticles was explored to understand the reaction mechanism. The optimized catalyst exhibited attractive catalytic activities and durability.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Ankur Kumar, Siddhartha K. Purkayastha, Ankur K. Guha, Manash R. Das, Sasanka Deka
Summary: Trimetallic FeCoPd polyhedral alloy nanoparticles were developed as a highly efficient bifunctional electrocatalyst for hydrogen and oxygen evolution reactions. The nanoparticles showed high current density and stability in both acidic and basic electrolytes after surface oxidation treatment.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Electrochemistry
Javed Muhommad, Lakshya Kumar, Purna K. Baruah, Manash R. Das, Sasanka Deka
Summary: This study investigates a new series of Cu-Co-B amorphous alloy nanosheets as electrode materials for energy storage, showing significant improvement in energy storage compared to state-of-the-art materials and flexible devices.
BATTERIES & SUPERCAPS
(2022)
Article
Chemistry, Physical
Bindu Antil, Ravi Ranjan, Chinnakonda S. Gopinath, Sasanka Deka
JOURNAL OF MATERIALS CHEMISTRY A
(2020)
Article
Chemistry, Physical
Meenakshi Chauhan, Sasanka Deka
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Lakshya Kumar, Purna K. Boruah, Sukanya Borthakur, Lakshi Saikia, Manash R. Das, Sasanka Deka
Summary: A flexible high-performance supercapacitor cell using nanostructured CuCo-layered double hydroxide (LDH) as electrode material is reported for the first time, showing specific capacity, capacitance, cell voltage, energy density, and power density values. The flexible cell offers long-term stability and Coulombic efficiency, while providing valuable concepts for understanding its exceptional charge storage characteristics.
ACS APPLIED NANO MATERIALS
(2021)