Article
Biochemistry & Molecular Biology
Keling Wang, Bingying Jia, Yehong Li, Jihong Sun, Xia Wu
Summary: This study prepared various cation-exchanged clinoptilolites and investigated their thermodynamic and kinetic properties as well as adsorption performances for CH4, N-2, and CO2. The results showed that the exchanged process became more spontaneous and difficult with the increase of exchange times.
Article
Materials Science, Multidisciplinary
Zeynep Gorkem Dogaroglu, Yagmur Uysal, Aydeniz Demir, Mehmet Nuri Makas, Zehranur Caylali
Summary: This study aimed to synthesize zeolite-based hydrogel composites for decolorization of real textile wastewater. The hydrogel was created via initial bridging with polyvinyl alcohol and sodium alginate, with zeolite particles distributed throughout the matrix. Response Surface Methodology was used to determine optimal adsorption conditions. The hydrogel composite achieved 86% color removal and a 166 Pt-Co/g adsorption capacity. The composite followed a pseudo-second-order kinetics model and a Langmuir adsorption isotherm. The study also demonstrated the potential of these particles as low-cost adsorbents for color removal from industrial wastewater.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Biotechnology & Applied Microbiology
Katrina Wruck, Graeme J. Millar, Tony Wang
Summary: This study revealed that fusion activation of natural zeolites improved the robustness of the synthesis process and opened up new avenues for green zeolite formation. Future studies should focus on reducing the activation costs by lowering activation temperature and sodium hydroxide consumption.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Environmental Sciences
Tonni Agustiono Kurniawan, Mohd Hafiz Dzarfan Othman, Mohd Ridhwan Adam, Xue Liang, Huihwang Goh, Abdelkader Anouzla, Mika Sillanpaa, Ayesha Mohyuddin, Kit Wayne Chew
Summary: This study investigates the use of natural zeolite clinoptilolite as a low-cost adsorbent for removing chromium from aqueous solutions. The adsorbent is pretreated with NaCl to enhance its removal performance and is regenerated with NaOH to sustain cost-effectiveness. Results show that NaCl-treated clinoptilolite has a higher Cr adsorption capacity and can treat a larger bed volume at a longer breakthrough time compared to as-received clinoptilolite. However, the treated effluents still do not meet the required Cr limit set by the EPA.
Article
Engineering, Chemical
Thalles S. Diogenes, Rafaelle G. Santiago, Debora A. S. Maia, Daniel V. Goncalves, Diana C. S. Azevedo, S. Mardonio P. Lucena, Moises Bastos-Neto
Summary: This study characterizes and investigates natural clinoptilolite through experimental and molecular simulation approaches. The obtained data can assist in the design of adsorption processes using clinoptilolite.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Biochemistry & Molecular Biology
Andzelika Gesikiewicz-Puchalska, Michal Zgrzebnicki, Beata Michalkiewicz, Agnieszka Kalamaga, Urszula Narkiewicz, Antoni W. Morawski, Rafal Wrobel
Summary: Zeolite 13X (NaX) was modified through ion-exchange with alkali and alkaline earth metal cations to enhance CO2 adsorption. The highest adsorption capacities were achieved with materials containing alkali metals, particularly the Li0.61Na0.39X form of zeolite. Exchange with alkaline earth metals led to decreased surface area and micropore volume, impacting CO2 adsorption. Interestingly, divalent cations resulted in the formation of mesopores.
Article
Materials Science, Multidisciplinary
O. Allahdin, N. Poumaye, M. Wartel, A. Boughriet
Summary: A metakaolinite-rich brick from Central African Republic was modified using a zeolitization process with sodium hydroxide, and the synthesized material was studied for ion-exchange behavior with different cationic metals. The importance of factors such as hydrated radius, ionic potential, hydration free energy, kinetics, and mass transfer/diffusion on the ion-exchange process at the brick-water interface was highlighted through experiments.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Vikas Yadav, Lalit Kumar, Neha Saini, Meenakshi Yadav, Nahar Singh, Vajjiravel Murugasen, Ezhilselvi Varathan
Summary: This study aims to evaluate the efficiency of ca-form natural clinoptilolite zeolite in ammonia removal. The results show that the removal efficiency of clinoptilolite zeolite in ammonia ions is 76.48% in the batch study. The adsorption process is best described by the pseudo-second-order and Freundlich models, and it is endothermic.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Chemistry, Physical
Sen Yang, Xiantang Liu, Gang Yang
Summary: This study uses molecular dynamics simulations to investigate cation exchange mechanisms at clay interfaces, revealing different selectivities for various binary ion systems and highlighting the strong coupling between thermodynamics, kinetics, and confinement effects. The results provide new insights into cation exchange processes at clay interfaces and offer explanations for experimental observations at the molecular level.
APPLIED CLAY SCIENCE
(2021)
Article
Environmental Sciences
Thaisa Frossard Coslop, Ramiro Picoli Nippes, Rosangela Bergamasco, Mara Heloisa Neves Olsen Scaliante
Summary: Diazepam has been detected in water sources globally, impacting the quality of drinking water, prompting the search for effective removal methods. Using natural clinoptilolite zeolite as an adsorbent offers a cheap and eco-friendly solution to remove this drug from water. Experimental results demonstrate the significant potential of zeolite for adsorbing diazepam in water.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Yi Liu, Shuanghui Zhao, Xiumei Qiu, Yi Meng, Hongquan Wang, Sen Zhou, Qiancheng Qiao, Chunjie Yan
Summary: This study demonstrates a simple method to prepare clinoptilolite-based zeolite-geopolymer foams. The obtained material possesses micropores of zeolite and meso/macropores of geopolymer matrix, and shows good static sorption performance for toxic heavy metals. The adsorption amounts for Cr3+, Pb2+, Ni2+, Cu2+, and Cd2+ are 6.21 mg/g, 6.11-6.13 mg/g, 5.92-6.07 mg/g, 5.53-5.93 mg/g, and 5.44-5.79 mg/g, respectively.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Applied
Leqian Song, Xuesen Du, Yanrong Chen, Zhongqing Yang, Jingyu Ran, Guangpeng Yang, Qiao Shi, Zongguo Xue
Summary: Zeolites with high Si/Al ratio are widely used in industrial desulfurization due to their stability and hydrophobicity. The study investigated the adsorption behavior of H2S in different zeolites using simulation methods and found that zeolites with a pore size of 7-9 angstrom and higher accessible area exhibit efficient adsorption. In the presence of CO, CO2, H2O, and N-2, FAU shows preferential adsorption on H2S. Co-SSZ doped on CHA is identified as the most promising adsorbent in the research.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Applied
Buse Sonmez, Emre Baser, Ozge Yilmaz Gel
Summary: This study aims to increase the photodecolourization efficiency of TiO2 on methylene blue by preparing TiO2 supported zeolite clinoptilolite catalysts. Metal-incorporated co-catalysts showed better performance than TiO2-ZC co-catalysts, with Fe-TiO2-ZC being the most efficient co-catalyst.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Biotechnology & Applied Microbiology
Mohd Azhar Abd Hamid, Hamidi Abdul Aziz, Mohd Suffian Yusoff, Sheikh Abdul Rezan
Summary: A novel single hybrid treatment method combining continuous clinoptilolite-augmented electrocoagulation with a sequencing batch reactor (SBR) process was introduced for highly concentrated ammoniacal nitrogen (NH3-N) and colour removal from landfill leachate. It was found that under optimal operating conditions, the proposed method was effective in removing NH3-N and colour, maintaining stable removal rates.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Green & Sustainable Science & Technology
Jadwiga Grzeszczak, Agnieszka Wroblewska, Karolina Kielbasa, Zvi C. Koren, Beata Michalkiewicz
Summary: In this study, the catalytic application of naturally occurring zeolite, clinoptilolite, in the oxidation of alpha-pinene was investigated. The main products obtained were ff-pinene oxide, verbenol, and verbenone, with a conversion of 35%.
