Article
Biochemistry & Molecular Biology
Suresh Velpula, Sashidhar Rao Beedu, Karuna Rupula
Summary: In this study, bimetallic Ag-Au, Ag-Pd, and Au-Pd nanoparticles were synthesized using a natural biopolymer gum kondagogu as a reducing and capping agent. Characterization of the nanoparticles showed different catalytic efficiencies in the reduction of 4-nitrophenol, with Ag-Pd exhibiting the highest efficiency among the three.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
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
Chemistry, Inorganic & Nuclear
Zhongjia Wu, Junlun Zhu, Wei Wen, Xiuhua Zhang, Shengfu Wang
Summary: In this study, Cu/Ag-COF was synthesized and showed better catalytic activity for the degradation of 4-NP, indicating a synergistic catalytic effect to enhance the catalytic activity of metal nanoparticles. Furthermore, Cu/Ag-COF exhibited good catalytic performance after eight cycles, demonstrating good stability and reusability.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Yu Chen, Senqin Fan, Jiaojiao Chen, Lei Deng, Zeyi Xiao
Summary: A catalytic membrane nanoreactor (CMNR) with Cu-Ag bimetallic catalysts immobilized in membrane pores was successfully fabricated via flowing synthesis and replacement reaction. The Cu core acts as an electron-deficient site to activate the -NO2 group for p-NP, while the Ag shell enhances active H spilling to the Cu surface for hydrogenation. The highest reaction rate constant of 1071 min(-1) was achieved for CMNR immobilized with Cu-Ag-2 due to suitable adsorption activation behavior and best hydrogen spillover behavior.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Applied
Derya Oncel Ozgur
Summary: In this study, a tailored mussel-inspired concept was introduced to facilitate the sustainable immobilization of silver nanoparticles onto graphene oxide sheets. The dopamine mediated graphene hybrid with Ag NPs exhibited excellent catalytic reduction activities due to promoting electron transfer and dispersion of small-sized silver nanoparticles on the surface of graphene. The resulting hybrid showed 15 times higher catalytic activity compared to the graphene/silver hybrid without modification.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Yuhang Zhao, Radwan M. Sarhan, Alberto Eljarrat, Zdravko Kochovski, Christoph Koch, Bernd Schmidt, Wouter Koopman, Yan Lu
Summary: Bimetallic nanostructures can generate a new type of photo-enhanced nanoreactors by utilizing photo-generated heat to accelerate catalytic reactions. The study demonstrates that the photothermal conversion of Au-Pd nanorods can be improved by coating with polydopamine or TiO2, resulting in increased reaction rates.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Shixian Deng, Baihan Zhao, Yayan Xing, Yuzhe Shi, Yujie Fu, Zhiguo Liu
Summary: Proanthocyanidins-functionalized Au/Ag bimetallic nanoparticles were synthesized by a hydrothermal method and characterized by various techniques. The nanoparticles exhibit uniform core-shell structures and show high removal efficiency for certain organic dyes.
GREEN CHEMISTRY LETTERS AND REVIEWS
(2021)
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
Engineering, Environmental
Xue-Qi Zhang, Rong-Fang Shen, Xiao-Jing Guo, Xi Yan, Yan Chen, Jiang-Tao Hu, Wan-zhong Lang
Summary: A convenient and environment-friendly grafting and reduction strategy was used to anchor bimetallic AgCu nanoparticles on polypropylene fabrics in this study. The prepared samples showed excellent catalytic activity in the reduction of 4-NP, with a proven synergistic effect between Ag and Cu nanoparticles. These results suggest that the PP composite with Ag-Cu nanoparticles could effectively provide superb catalytic efficiency and stability in 4-nitrophenol reduction, making it suitable for practical applications in diverse waste water treatment.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Wenjuan Ma, Guimin Zhang, Peng Zhang, Zhengyi Fu
Summary: This paper reports the synthesis of Ag-Pd bimetallic hollow nano-hexagons using galvanic replacement reaction and co-reduction method. By controlling the role of cetyltrimethylammonium bromide (CTAB) and the amount of palladium chloride acid (H2PdCl4), the composition and structure of the bimetals can be finely tuned. The study concludes that hollow bimetallic nano-hexagons with the composition of AgPd0.61 exhibit the highest catalytic activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Chun Wang, Lei Yang, Xiaofang Yuan, Wending Zhou, Meisong Xu, Wanliang Yang
Summary: In this study, novel silver nanoparticles supported on amino-functionalized peeled-watermelon-like silica-coated magnetic catalysts were successfully synthesized for the catalytic reduction of 4-nitrophenol in wastewater. The Fe3O4@SiO2-NH2-Ag catalyst exhibited excellent catalytic activity, easy recovery under an external magnetic field, and the ability to be reused for multiple cycles, making it a promising material for practical applications.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Limin Song, Kaiyuan Tan, Yingyue Ye, Baolin Zhu, Shoumin Zhang, Weiping Huang
Summary: In today's age of resource scarcity, the development and utilization of low-cost renewable energy sources have garnered significant global attention. This study utilized modified cheap natural halloysite nanotubes as supports for metal catalysts, resulting in highly efficient catalytic performance.
Article
Environmental Sciences
C. Vijina, K. P. Majitha, Shima P. P. Damodaran
Summary: In this work, a simple and environmentally friendly approach was followed to synthesize amine-functionalized reduced graphene oxide (RGO)-supported silver nanoparticle (AgNPs) with superior catalytic efficiency for the reduction of organic pollutants. RGO/AgNPs nanohybrid was synthesized by hydrothermal reduction of silver nitrate in the presence of amino-propyl trimethoxy silane (APTMS)-functionalized graphene oxide (GO) nanosheets. The nanohybrid exhibited uniform and smaller-sized silver nanoparticles on the surface of RGO nanosheets due to the presence of APTMS. The RGO/AgNPs nanohybrid showed excellent catalytic activity, favorable kinetic parameters, and sustained catalytic efficiency after recycling, making it a promising catalyst for environmental remediation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Wen-Zhe Xiao, Ling-Ping Xiao, Yue-Qin Yang, Shang-Ru Zhai, Run-Cang Sun
Summary: This study reports a catalyst consisting of silver nanoparticles immobilized on an amine-functionalized metal-organic framework, which exhibits superior degradation efficiency and recyclability for organic pollutant remediation in water.
Article
Environmental Sciences
Pooja Bhatia, Mala Nath
Summary: This article presents the development of an efficient and sustainable Ag/NiO catalyst for the removal of hazardous chemicals from wastewater. The catalyst, composed of anchored Ag nanoparticles on NiO octahedrons, demonstrates excellent catalytic activity for the reduction of nitrophenols and organic dyes. It also shows promising performance in treating mixtures of pollutants and real industrial wastewater samples.
Article
Chemistry, Physical
Nadine J. Kanik, Artur Kuligiewicz, Jeffrey T. Cullen
Summary: This study examined the effects of different pre-treatments on the structural H-isotope composition of clay minerals. The results showed that different pre-treatments had varied impacts on different clay minerals, and the choice of pre-treatment should be based on the specific properties and mineralogy of the samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Lorenzo Lisuzzo, Giuseppe Cavallaro, Stefana Milioto, Giuseppe Lazzara
Summary: This study proposes Pickering emulsions based on wax and halloysite clay nanotubes for coating silk sutures to increase their loading capacity towards eosin. The presence of halloysite/wax microspheres on the surface of silk sutures has also been explored for controlled release of hydrophobic drugs. The influence of the coating on the thermal and mechanical properties of the sutures has been studied using various techniques. In conclusion, the wax/halloysite Pickering emulsions can successfully generate hydrophobic microdomains on the surface of silk sutures, leading to enhanced flexibility and improved loading capacity towards eosin.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Bruna F. Alves, Rita C. P. Nunes, Luiz C. Bertolino, Elizabete F. Lucas
Summary: Operational problems in the oil industry caused by the precipitation of paraffins can be prevented by using polymeric additives. This article evaluates the use of polymeric nanocomposites as pour point reducers in different types of crude oil and finds that they are more efficient than pure poly(ethylene-covinyl acetate) (EVA) in reducing the pour point. The nanocomposites also modify the wax crystals and reduce the viscosity of the oil samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
K. A. Daniels, C. C. Graham, A. C. Wiseall, J. F. Harrington, P. Sellin
Summary: Geological storage with clay buffer is widely preferred for removing hazardous radioactive waste. The impact of fluid salinity and void space on the swelling behavior of barrier bentonites was examined through experiments. The findings suggest that clay swelling is suppressed at higher salinities, which affects the void-filling process.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
N. Werling, A. Kuligiewicz, A. Steudel, R. Schuhmann, F. Dehn, K. Emmerich
Summary: Thermal treatment of clay minerals can be used to produce building materials and environmentally friendly binders. This process involves dehydration, dehydroxylation, breakdown of structure, and recrystallization of high temperature phases. Rehydration and rehydroxylation are important factors to consider for geopolymers and SCM.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Xuan Wang, Hao Ding, Zhuoqun Xu, Jianmeng Zhang, Yanbin Yao
Summary: Rutile nano-TiO2 was loaded onto the surface of sericite to prepare sericite-rutile composite particles, which were then modified with HDTMS and sprayed onto the substrates to form sericite-rutile/HDTMS composite coatings with UV shielding and superhydrophobic self-cleaning properties. The coating exhibited good UV shielding rate and remained superhydrophobic after UV irradiation. The hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS contributed to the superhydrophobicity and UV shielding effect of the coating.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Kailang Sun, Taojun Zhang, Jie Zhou, Yonghong Liu, Minfeng Zeng, Zhen Yang, Ruokun Feng, Xiaorong Ren, Peng Zhang, Baoyi Wang, Xingzhong Cao
Summary: Chitosan-Pd0 nano particles encapsulated in Al, Co-pillared montmorillonite nanocomposites were successfully synthesized using a facile one-pot heat treatment method. The Al, Co pillaring effectively expanded the surface area and generated numerous mesopores in the interlayer space of the MMt. The resultant nanocomposite exhibited similar high comprehensive catalytic performances as the one prepared by the regular divided-multistep method. The encapsulation of CS chains and doping of Co in the Al pillaring also contributed to the improved catalytic performance.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Nathalie Fagel, Isabel Israde-Alcantara, Reza Safaierad, Marttiina Rantala, Sabine Schmidt, Gilles Lepoint, Pierre Pellenard, Nadine Mattielli, Sarah Metcalfe
Summary: Environmental conditions significantly influence clay minerals, and studying clay sediments in tropical lakes can provide valuable insights into past environmental conditions. In this study, multiproxy records from sediment cores of three crater lakes in central Mexico were analyzed. The results showed that disordered kaolinite, formed through hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments. The abundance of kaolinite varied in relation to organic carbon and organic matter-related elements, and showed opposite trends with lithogenic elements. Geochemical data suggested that the increase in kaolinite abundance is linked to the formation of organo-mineral aggregates and lake level changes in closed basins.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
M. J. Martin-Alfonso, A. Mejia, F. J. Martinez-Boza, P. Partal
Summary: The drilling industry is facing new challenges to develop eco-friendlier drilling fluids. Organic modified sepiolite dispersed in oil can be an excellent additive with suitable rheological properties. This study investigated the effect of alkyl ammonium modifiers on the microstructure and rheological properties of sepiolite-vegetable oil dispersions under high-temperature and high-pressure conditions.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Weiquan Zhan, Siyuan Yang, Shenxu Bao, Liuyi Ren, Cheng Liu
Summary: The interaction between talc and the depressor CMC was investigated through molecular dynamics simulation and density functional theory calculation. It was found that CMC showed stronger adsorption on the edge plane of talc due to enhanced interactions with polar groups and water molecules. The study also revealed specific interactions between H atoms in CMC and O atoms in the edge plane, as well as between O atoms in CMC and Si, Mg atoms in the edge plane. Hydration shells on the basal and edge planes of talc were examined to explain the phenomenon.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Pierre Dramou, Yiyang Sun, Xu Ni, Fangqi Wang, Hua He
Summary: In this study, a magnetic nanocomposite was prepared and used for the separation of rutin from real samples through magnetic solid phase extraction (MSPE). The nanocomposite exhibited high specific surface area, chemical and thermal stability, water solubility, and easy separation in aqueous solution. Characterization and experiments confirmed the successful synthesis and efficient enrichment ability of the nanocomposite.
APPLIED CLAY SCIENCE
(2024)