Article
Chemistry, Physical
Beata Szczepanik, Piotr Slomkiewicz, Dariusz Widel, Marianna Czaplicka, Laura Frydel
Summary: The photocatalytic degradation kinetics of aniline and its derivatives were studied under different photocatalysts, with complete degradation observed after 300 minutes. The higher adsorption capacity and immobilization of TiO2 and Fe2O3 on the halloysite surface in nanocomposites significantly increased the photocatalytic activity compared to commercial catalysts.
Article
Chemistry, Applied
Mounir Khelifa, Senia Mellouk, Gisele Laure Lecomte-Nana, Isabelle Batonneau-Gener, Kheira Marouf-Khelifa, Amine Khelifa
Summary: This study explored the effect of sulfuric acid treatment on the physicochemical and adsorptive properties of halloysite, and proposed a coherent mechanism for the interaction between chloramphenicol and acid-leached halloysite. The results showed that acid treatment significantly increased the specific surface area and adsorption capacity of the samples for chloramphenicol.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Physical
Vanessa de Abreu Pereira, Iara dos Santos Paz, Amanda Lima Gomes, Lorena Alves Leite, Pierre Basilio A. Fechine, Men de Sa Moreira de S. Filho
Summary: Halloysite nanotubes (HNT) are natural aluminum silicate clays with a hollow tubular structure. Acid activation improved the properties of HNT, facilitating the incorporation and release of curcumin. Curcumin was incorporated via electrostatic interactions with Al3+ and partially adsorbed on the HNT pores surface.
APPLIED CLAY SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Ana Borrego-Sanchez, Claro Ignacio Sainz-Diaz, Luana Perioli, Cesar Viseras
Summary: The study found that retinol, niacinamide, and glycolic acid can be stably adsorbed on the internal surface of halloysite, forming hydrogen bonds with the hydroxyl groups of the inner surface and showing electrostatic interaction with water molecules. This indicates that the adsorption of these active ingredients in halloysite nanotubes is favorable and may be used for future topical formulations for skincare.
Article
Environmental Sciences
J. A. Alvarez-Alvareza, A. Aguilar-Aguilar, A. Robledo-Cabrera, R. Ocampo-Perez, R. Leyva-Ramos, E. Padilla-Ortega
Summary: Nanocomposites based on alginate and halloysite were developed and characterized. The Hy/Alg nanocomposites exhibited negative charge density and good thermal stability. The adsorption capacity for Cd(II) decreased with increasing halloysite content in the nanocomposite. The Cd(II) adsorption equilibrium was affected by pH and temperature, with electrostatic interactions playing a role. The adsorption rate was enhanced by the presence of Hy in the nanocomposites.
ENVIRONMENTAL RESEARCH
(2023)
Article
Materials Science, Ceramics
Sylvain Tome, Dzoujo T. Hermann, Victor O. Shikuku, Stephen Otieno
Summary: In this study, two geopolymers were prepared using volcanic ash as the precursor material, through acid activation and alkaline activation methods. The alkaline activated geopolymer exhibited higher adsorption capacity, faster adsorption kinetics, and better thermodynamic properties compared to the acid activated geopolymer, suggesting its superior performance as a sorbent for dye removal.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Environmental
Chunxia Guo, Weidong Chen, Shufang Yan, Yachao Chen, Xueping Zhao, Pengfei Zhang, Wen Ma, Ao Yang
Summary: Research has shown that zirconia loaded on halloysite nanotubes (ZrO2/HNTs) can effectively extract arsenic (As(III)) from water. The ZrO2/HNTs nanohybrid has a large surface area and abundant hydroxyl groups, which contribute to its high As(III) adsorption capacity. Furthermore, the nanohybrid exhibits sufficient selectivity towards As(III) even in the presence of common coexisting ions. The study highlights the potential of ZrO2/HNTs as a material for arsenic-contaminated water treatment.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Elham Zandi-Mehri, Lobat Taghavi, Farid Moeinpour, Iman Khosravi, Saber Ghasemi
Summary: In this study, a hydroxyl terminated triazine-based dendritic polymer was synthesized and grown on the surface of halloysite nanotubes to efficiently remove Pb(II) ions from aqueous solution. The nano-adsorbent exhibited good adsorption performance, and the removal of Pb(II) ions was mainly attributed to chelation through O atoms.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Physical
Min Xia, Haibo Liu, Hanlin Wang, Fuwei Sun, Xuehua Zou, Tianhu Chen, Ziyang Chu, Dong Chen, Yuefei Zhou, Qiaoqin Xie
Summary: The interaction between halloysite and hematite affects the environmental fate of organic pollutants by altering their adsorption and degradation processes, as demonstrated in this study. The presence of hematite changes the Zeta potential of halloysite, while halloysite enhances the dispersion of hematite and improves the activation of H2O2 for degradation of pollutants. The hydroxyl radicals were identified as the main reactive species for the degradation process, highlighting the importance of understanding the migration, enrichment, and degradation of organic pollutants in soil.
APPLIED CLAY SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Huan Gao, Miguel A. Soto, Zongzhe Li, Lucas J. Andrew, Mark J. Maclachlan
Summary: Scientists developed new aerogel sorbents by combining halloysite nanotubes and cellulose nanocrystals, and these materials effectively remove dyes from water. They are environmentally friendly, cost-effective, and have potential for water remediation.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Environmental
Mohammad Hassan Kanani-Jazi, Somaye Akbari
Summary: The successful fabrication of amino-dendritic and carboxyl functionalized halloysite nanotubes was achieved through convergent synthesis route and chemical coupling reaction. The modified samples were characterized by various techniques, and their adsorption capacities for different dyes were systematically examined. Additionally, the desorption experiments suggested that the modified nanoclay remained stable at neutral pH.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Inorganic & Nuclear
Zahra Asadi, Samahe Sadjadi, Mehdi Nekoomanesh-Haghighi, Naeimeh Bahri-Laleh
Summary: In this study, we investigated the effect of acid-treatment of halloysite on its performance as a support for immobilizing Pd nanoparticles. We found that long-time acid-treatment significantly increased the specific surface area and induced formation of fine particles within the lumen of halloysite, while short-time acid-treatment slightly increased the specific surface area and remarkably decreased Pd loading. The activity of the synthesized catalysts followed the order of Pd/Hal > Pd/Hal-A72 > Pd/Hal-A9, demonstrating the importance of Pd loading and accessibility of Pd nanoparticles in the catalysis of PAO hydrogenation containing structurally big molecules.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Aryan Ekhlasi, Atefeh Solouk, Masoumeh Haghbin Nazarpak, Pooria Pasbakhsh, Mahvash Shokrollahi
Summary: This study demonstrates the potential of using halloysite nanotubes for creatinine adsorption in hemodialysis membranes. The composite polyacrylonitrile membranes loaded with 20 wt% of calcined halloysite nanotubes show excellent performance in creatinine removal, mechanical properties, and biocompatibility. This innovative approach has significant implications for the development of hemodialysis membranes.
APPLIED CLAY SCIENCE
(2023)
Article
Engineering, Environmental
Minhua Su, Tao Ou, Jiayi Li, Lizhi Tong, Weixing Han, Yuhua Wu, Diyun Chen
Summary: Uranium mining and nuclear energy production generate large amounts of uranium-containing radioactive wastewater. Silicate minerals such as halloysite nanotubes enriched in Fe, Al, and Si have properties suitable for treating this wastewater. In this study, nanorod composites of halloysite nanotubes loaded with alpha-Fe2O3 and Fe3O4 were used to adsorb uranyl ions. The equilibrium adsorption was achieved within a short contact time, and the maximum adsorption capacities were 74.64 mg/g and 66.40 mg/g for He-HNTs and Ma-HNTs, respectively. Ma-HNTs showed excellent magnetic separation performance for uranium-containing radioactive wastewater. The sequestration behavior of U(VI) on He-HNTs and Ma-HNTs was dominated by ion exchange, surface complexation, and electrostatic interactions. Reduction processes contributed to greater U(VI) removal efficiency in the Ma-HNTs-U(VI) system. The iron oxide-halloysite composites hold great promise for treating uranium(VI)-containing wastewater.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Islem Chaari, Mounir Medhioub, Fakher Jamoussi, Ahmed Hichem Hamzaoui
Summary: The clay deposits of El Haria formation in Gafsa basin, Tunisia were treated with sulfuric acid to enhance surface properties and dye adsorption capacity. The acid treatment resulted in increased surface area and porosity of the material, leading to improved dye adsorption performance.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Analytical
Piotr M. Slomiciewicz, Beata Szczepanik, Magdalena Garnuszek, Pawel Rogala, Zygfryd Witkiewicz
JOURNAL OF AOAC INTERNATIONAL
(2017)
Article
Chemistry, Physical
A. Kubala-Kukus, B. Szczepanik, I. Stabrawa, D. Banas, K. Szary, M. Pajek, P. Rogala, K. Wojtowicz, P. Slomkiewicz
RADIATION PHYSICS AND CHEMISTRY
(2020)
Article
Environmental Sciences
Katarzyna Jedynak, Beata Szczepanik, Nina Redzia, Piotr Slomkiewicz, Anna Kolbus, Pawel Rogala
Article
Chemistry, Physical
Beata Szczepanik, Nina Redzia, Laura Frydel, Piotr Slomkiewicz, Anna Kolbus, Katarzyna Styszko, Tadeusz Dziok, Bogdan Samojeden
Article
Chemistry, Physical
Piotr Slomkiewicz, Beata Szczepanik, Marianna Czaplicka
Article
Chemistry, Physical
Beata Szczepanik, Dariusz Banas, Aldona Kubala-Kukus, Karol Szary, Piotr Slomkiewicz, Nina Redzia, Laura Frydel
Article
Chemistry, Physical
Beata Szczepanik, Piotr Slomkiewicz, Dariusz Widel, Marianna Czaplicka, Laura Frydel
Summary: The photocatalytic degradation kinetics of aniline and its derivatives were studied under different photocatalysts, with complete degradation observed after 300 minutes. The higher adsorption capacity and immobilization of TiO2 and Fe2O3 on the halloysite surface in nanocomposites significantly increased the photocatalytic activity compared to commercial catalysts.
Article
Chemistry, Physical
Beata Szczepanik, Piotr Slomkiewicz, Magdalena Garnuszek, Pawel Rogala, Dariusz Banas, Aldona Kubala-Kukus, Ilona Stabrawa
CLAYS AND CLAY MINERALS
(2017)
Article
Chemistry, Physical
Beata Szczepanik, Pawel Rogala, Piotr M. Slomkiewicz, Dariusz Banas, Aldona Kubala-Kukus, Ilona Stabrawa
APPLIED CLAY SCIENCE
(2017)
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)