Review
Chemistry, Applied
Seong-Nam Nam, Byung-Moon Jun, Chang Min Park, Min Jang, Kyung-Suk Cho, Ji Yi Lee, Chanhyuk Park, Shane A. Snyder, Ahjeong Son, Yeomin Yoon
Summary: This study reviews the application of graphene/(reduced) graphene oxide-based nanoadsorbents in water purification, with a focus on the adsorption mechanisms for bisphenol A removal. The results show that the removal of bisphenol A varies significantly depending on the properties of compounds, adsorbents, and water chemistry conditions. Therefore, this study evaluates the adsorption capacities of nanoadsorbents, the influences of water quality factors, the mechanisms affecting adsorption, and the desorption and reusability of carbon-based nanomaterials.
SEPARATION AND PURIFICATION REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Feng Gao, Lei Zhang, Libin Yang, Xuefei Zhou, Yalei Zhang
Summary: Three types of graphene oxides (GOs) were prepared and used for the removal of Cr(VI). The adsorption performance of GOs was affected by initial concentration, pH, adsorbent dosage, contact time, and temperature. The adsorption mechanisms involved redox reaction, electrostatic attraction, pore filling, ion exchange, and complexation. The adsorption processes were mainly monolayer chemisorption and equilibrium could be reached in 30 min. The saturation adsorption capacities of GO-M1, GO-M2, and GO-M3 for Cr(VI) were estimated to be 3.5412 mg.g(-1), 2.3631 mg.g(-1), and 7.0358 mg.g(-1), respectively. The adsorption processes of Cr(VI) by GOs were endothermic, entropy-driven, and thermodynamically spontaneous and feasible. These findings provide important insights into the mechanism and application of Cr(VI) removal by GOs.
Article
Chemistry, Multidisciplinary
Dinh-Trinh Tran, Thi-My-Trinh Ha, Thi-An-Hang Nguyen, Viet-Cuong Dang, Van-Duong Dao
Summary: This study successfully produced rGO material and characterized it comprehensively, while studying the adsorption properties of TC on it, including adsorption kinetics, thermodynamics, and adsorption isotherms. The experimental results showed that the adsorption of TC on rGO is spontaneous, endothermic, and governed by both physisorption and chemisorption.
SEPARATION SCIENCE AND TECHNOLOGY
(2022)
Article
Agricultural Engineering
Komal Saini, Abhisek Sahoo, Bijoy Biswas, Avnish Kumar, Thallada Bhaskar
Summary: Lignin-derived zeolite templated carbon materials were used for methyl orange removal, showing high adsorption efficiency. Response surface methodology optimized the adsorption parameters, with adsorbent dosage found to be the most influential variable. Additionally, the theoretical adsorption capacity of the adsorbents was high and the kinetic data fit the pseudo-second-order model well.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Abdulrahman Abu-Nada, Ahmed Abdala, Gordon McKay
Summary: Graphene oxide (GO) was successfully synthesized and characterized in this study, showing excellent adsorption capability for removing Sr (II) from aqueous solutions. The adsorption equilibrium and kinetic results were in agreement with the Langmuir isotherm model and the pseudo-second-order kinetic model. The maximum strontium adsorption capacity reached 131.4 mg/g, suggesting potential applications in wastewater treatment.
Article
Engineering, Environmental
Swati Verma, Ki-Hyun Kim, Navneet Kumar, Satya Sundar Bhattacharya, Mu Naushad, Raj Kumar Dutta
Summary: In this study, ammonia-functionalized graphene oxide (NH(3)GO) sheets were synthesized via solvothermal method for the adsorptive removal of organic pollutants in water. The NH(3)GO sheets exhibited high adsorption capacity and partition coefficient for different types of organic pollutants. Thermodynamic analysis revealed the endothermic and spontaneous nature of the adsorption process.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Taiba Naseem, Fozia Bibi, Saira Arif, Muhammad Waseem, Sirajul Haq, Mohamad Nor Azra, Taavi Liblik, Ivar Zekker
Summary: The study utilized rGO-ZnO for removing Cr (VI) from aqueous medium, which was found to be more economical and promising than GO. The adsorption kinetics followed the pseudo-first-order model, while the equilibrium study showed that the non-linear Langmuir model was a better fit. The calculated maximum adsorption capacities for GO and rGO-ZnO nanocomposite were 19.49 mg/g and 25.45 mg/g, respectively, with endothermic and spontaneous nature of adsorption detected.
Article
Chemistry, Physical
Sesegma Ts. Khankhasaeva, Sayana V. Badmaeva, Marina V. Ukhinova
Summary: The adsorption of diclofenac (DCF), a common pharmaceutical pollutant, on Fe2O3-pillared montmorillonites (Fe-PMts) was studied. Fe-PMts were synthesized by intercalation of natural montmorillonite with iron polyoxocations. The pillaring process significantly increased the specific surface area and sorption capacity of the clay. The pH, sorbent content, DCF concentration, and temperature were found to be the main factors affecting DCF adsorption. The kinetic data and adsorption isotherm were analyzed using various models, and the results showed that the adsorption followed pseudo-second order kinetics and Langmuir isotherm. The thermodynamic parameters indicated that the adsorption of DCF on Fe-PMt was spontaneous and exothermic. Fe-PMt was proven to be an effective and environmentally friendly sorbent for DCF removal in pharmaceutical wastewater treatment.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Sushma Yadav, Anupama Asthana, Ajaya Kumar Singh, Rupa Chakraborty, S. Sree Vidya, Ambrish Singh, Sonia A. C. Carabineiro
Summary: This study focuses on the efficient adsorption of fluoroquinolone antibiotics using Met-GO/SA hydrogel beads, with various characterization techniques used to analyze the prepared adsorbents. The results show that the functionalized adsorbent has better adsorption efficiency compared to the non-functionalized adsorbent, making it a promising candidate for large-scale water remediation.
Article
Environmental Sciences
A. Khan, S. Noor, M. S. Khan, R. Khattak, A. Malik, U. U. Rahman, I. Zekker, N. U. Rahman, L. A. Shah
Summary: Aromatic triarylmethane dyes residues cause serious water pollution in the environment. Adsorbents such as graphene oxide (GO) have been found to effectively remove crystal violet (CV) dye from wastewater. Different parameters and experimental results indicate that GO, graphite, and graphene quantum dots (GQDs) have high removal capacities for CV dye, with GQDs showing the highest efficiency. Thermodynamic and kinetic experiments suggest that the adsorption process is spontaneous, endothermic, and follows both pseudo-first and pseudo-second-order kinetics. The Langmuir adsorption isotherm model fits the adsorption data best, indicating chemisorption with single coverage layer.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Cai Zeng, Kaihua Huang, Chengke Wang, Yutao Gong, Na Huang, Xiaoping Huang, Huifang Yang, Song Zou, Hong Zhong
Summary: In this study, octyl hydroxamic acid (OHA) was used as a collector for galena flotation, and its adsorption kinetics on galena surface was fully investigated. The optimal pH for adsorption was found to be 9.5, and adsorption equilibrium was reached within 2 hours. It was observed that the adsorption process was exothermic, spontaneous, ordered, and monolayer. The adsorption of OHA on galena surface altered the surface charges and enhanced the hydrophobicity, as confirmed by zeta potential and contact angle measurements, respectively. XPS analysis revealed that OHA primarily chemisorbed on the galena surface through binding reactions between the two oxygen atoms of the -C(=O)-NHOH group and Pb(OH)+ ions at pH 9.5. Flotation experiments demonstrated that 4 x 10-5 mol/L OHA collected 98.62% of galena at pH 9.5, which was higher than the efficiency achieved by sodium isopropyl xanthate (SIPX) under the same experimental conditions.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Physical
Burcu Gunes, Yannick Jaquet, Laura Sanchez, Rebecca Pumarino, Declan McGlade, Brid Quilty, Anne Morrissey, Zahra Gholamvand, Kieran Nolan, Jenny Lawler
Summary: The study prepared crosslinked calcium alginate-graphene oxide beads and activated them for removal of organic pollutants, showing high adsorption capacities and adaptability. The activated beads exhibited good adsorption performance, with fitting accuracy and thermodynamic parameters playing important roles in the adsorption process.
Article
Environmental Sciences
Dibya Ranjan Rout, Hara Mohan Jena
Summary: This study focuses on the batch adsorption of phenol from an aqueous solution using reduced graphene oxide (RGO) as an adsorbent. The optimized adsorption conditions were determined and various models were used to analyze the adsorption behavior. The results showed that RGO had the ability to regenerate and effectively remove phenol.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Yurong Gao, Zheng Fang, Wenhui Lin, Hanbo Chen, Amit Bhatnagar, Jianhong Li, Yanhai Xie, Yanping Bao, Junfeng Chen, Hongting Zhao, Jun Meng, Wenfu Chen, Hailong Wang
Summary: The effect of flake-size graphene on biochar modification and its bisphenol S (BPS) adsorption performance was explored for the first time in this study. It was found that small-sized graphene was interspersed in the macropores of biochar, while large-sized graphene effectively prevented the agglomeration and pore blockage of biochar. Large-flake graphene oxide modified biochar (LGB) showed the highest adsorption capacity towards BPS, exhibiting 2.8 times higher adsorption than pristine biochar.
ENVIRONMENTAL POLLUTION
(2023)
Article
Biotechnology & Applied Microbiology
V. Nithya Priya, M. Rajkumar, J. Mobika, S. P. Linto Sibi
Summary: Efficient nanocomposite adsorbents based on carboxymethyl cellulose incorporated Fe-Al layered double hydroxide reduced graphene oxide were synthesized for the adsorption of Arsenate ions in wastewater. The incorporation of carboxymethyl cellulose improved the active sites and adsorption capacity of the composites. The adsorption parameters and kinetics were optimized, and the possible mechanism between Arsenate ions and the composites was electrostatic interaction. The synthesized nanocomposite adsorbents showed good reusability and stability.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
