Article
Energy & Fuels
James F. Amaku, Jude C. Nnaji, Segun A. Ogundare, Kovo G. Akpomie, Comfort M. Ngwu, Helen O. Chukwuemeka-Okorie, Siyaka Mj Zubairu, Boniface I. Ugwu, Stephen A. Odoemelam, Jeanet Conradie
Summary: In this research, a novel green tillite-based adsorbent (CMT) was synthesized by modifying the surface of natural/pristine tillite (PT) with Chrysophyllum albidum stem bark extract. CMT showed higher efficiency and adsorption capacity for Cr(VI) removal compared to most materials used for this purpose. The results also demonstrated the reusability of CMT and the chemisorption as the rate-controlling step. This study highlights the potential of Chrysophyllum albidum stem bark extract anchored on tillite as a green adsorbent for efficient Cr(VI) removal from polluted water.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Chemistry, Physical
Hemant Mittal, Ali Al Alili, Pranay P. Morajkar, Saeed M. Alhassan
Summary: The synthesized GO/PEI-NCH hydrogel demonstrated high adsorption capacity for Cr(VI) contaminated water, good stability, and reusability through multiple adsorption-desorption cycles, making it a promising candidate for wastewater treatment.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Green & Sustainable Science & Technology
Huiting Zeng, Honghu Zeng, Hua Zhang, Asfandyar Shahab, Kang Zhang, Yanqin Lu, Iqra Nabi, Faiza Naseem, Habib Ullah
Summary: The research demonstrates that eucalyptus activated carbon can effectively remove hexavalent chromium from water, with a significantly higher removal rate than eucalyptus carbon. The surface area of activated carbon increased significantly, and the adsorption process is influenced by multiple factors.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Ataollah Babakhani, Majid Sartaj
Summary: This study successfully removed cadmium from aqueous solution using Cd(II)-imprinted chitosan hydrogel beads. The synthesis was confirmed through various analyses, and the adsorption process parameters and mechanisms were determined through batch adsorption tests and isotherm investigations.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Polymer Science
Wei Jia, Jiang Du, Ming Jiang, Mengying Zhang, Enlin Han, Hongqing Niu, Dezhen Wu
Summary: Amino-rich functionalized polyimide-polyethyleneimine fibers were successfully prepared in this study to overcome the shortcomings of nanofiber membranes. Characterization techniques were used to analyze the structure and morphology of the fibers at each functionalization step. The adsorption process followed a pseudo-second-order model, and the Langmuir model was more suitable for describing the adsorption isotherm. The fibers also exhibited good regeneration performance and stable tensile strength. This work achieved efficient removal of Cr (VI) by combining the excellent properties of the fibers.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Green & Sustainable Science & Technology
Yanyan Liu, Xiaoxiao Xie, Jie Wang, Jun Tao, Yaru Li, Xiaochun Ye, Kai Xu
Summary: The article investigates the adsorption characteristics of aqueous Cr(VI) biochar by magnetic ?Fe2O3/Fe3O4/NaOH lotus stem biochar (SMBC). SMBC was successfully prepared with a saturation magnetization of 66.608 emu/g and a BET specific surface area of 239.56 m(2)/g. The adsorption isotherm study showed that the theoretical maximum adsorption capacity of SMBC for Cr(VI) was 196.270 mg/g. The adsorption mechanism of SMBC to Cr(VI) mainly included electrostatic interaction, redox, and complexation. Desorption and regeneration experiment results showed that SMBC could be easily recycled from the solution under the force of an external magnetic field, with about 80% of the original adsorption capacity maintained after six cycles.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2023)
Article
Chemistry, Inorganic & Nuclear
Vaishnavi Gomase, Ravin Jugade, Priyanka Doondani, D. Saravanan, Sadanand Pandey
Summary: In this study, chitosan was successfully modified by crosslinking and forming a composite with cotton-straw-derived biochar. The modified materials showed enhanced adsorption capacities for Cr(VI) and better stability and surface area.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Biochemistry & Molecular Biology
Ashraf Ali, Sarah Alharthi, Nora Hamad Al-Shaalan, Alia Naz, Hua-Jun Shawn Fan
Summary: In this study, amide-modified biochar was synthesized through low-temperature pyrolysis of rice husk and utilized for the removal of Cr(VI) from wastewater. The results showed that under optimal conditions (pH 2, adsorbent time of 60 min, adsorbent dosage of 2 g/L, and metal concentration of 100 mg/L), the amide-modified biochar achieved a removal efficiency of 97% for Cr(VI). The adsorption data fitted well with the Langmuir isotherm model, and the kinetics study revealed a pseudo-second-order kinetic model for Cr(VI) adsorption.
Article
Chemistry, Physical
Haijie He, Kuan Chai, Tao Wu, Zhanhong Qiu, Shifang Wang, Jie Hong
Summary: This study investigated the adsorption capacity of kaolin, kaolin-sodium bentonite, and kaolin-organic bentonite for removing rhodamine B from water. The results showed that the addition of bentonite improved the adsorption capacity of kaolin for rhodamine B. The Langmuir and Freundlich isotherm models were suitable for describing the adsorption process, while a pseudo-second order kinetic model described the adsorption kinetics.
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
Engineering, Chemical
Nilgun Onursal
Summary: This study used mixed-type clay as an adsorbent to remove Ni(II) ions from aqueous solutions. Crystallographic analysis was performed for identification. Various parameters such as concentration, temperature, amount of adsorbent, and thermodynamic parameters were examined. The data fitted the Langmuir adsorption isotherm model the best and the clay showed moderate efficiency in removing Ni(II) ions.
DESALINATION AND WATER TREATMENT
(2022)
Article
Environmental Sciences
Sami Ullah, Altaf Ur Rahman, Fida Ullah, Abdur Rashid, Tausif Arshad, Eva Viglasova, Michal Galambos, Niyaz Mohammad Mahmoodi, Haseeb Ullah
Summary: The study evaluated the potential of three different natural inorganic clays for removing malachite green dye from aqueous solutions. Results showed that Langmuir isotherm model and pseudo-first-order kinetic model best described the adsorption behavior of MG, and natural inorganic clays with higher surface area can be effective adsorbents for removing MG dye.
Article
Environmental Sciences
Abdul Ahad Khan, Salman Raza Naqvi, Imtiaz Ali, Muazzam Arshad, Hamad AlMohamadi, Umair Sikandar
Summary: The aim of this work is to synthesize algae-derived biochar through slow pyrolysis and use it as an adsorbent to remove Cr (VI). The maximum removal percentage of Cr (VI) is 97.88% and the Langmuir isotherm model and pseudo-nth order models are suitable to describe the adsorption and kinetics. The maximum adsorption capacity of algal biochar is 186.94 mg/g.
Article
Chemistry, Physical
Maria Ulfa, Abu Masykur, Amanah Firdausa Nofitasari, Novia Amalia Sholeha, Suprapto Suprapto, Hasliza Bahruji, Didik Prasetyoko
Summary: In this study, mesoporous sodalite nanoparticles were synthesized from Indonesian kaolin with the addition of CTABr as a template. The effects of aging time and temperature on the surface area and mesoporosity of sodalite were investigated. The results showed that higher aging temperatures and longer aging times led to the formation of sodalite with larger surface area and higher mesopore volume.
Article
Biochemistry & Molecular Biology
Justyna Ulatowska, Lukasz Stala, Izabela Polowczyk
Summary: Good sorption properties and simple synthesis route make schwertmannite an increasingly popular adsorbent. The study compared the properties and sorption performance of adsorbents obtained by Fe3+ hydrolysis and Fe2+ oxidation methods. Results show that both iron-based adsorbents are suitable for removing Cr(VI) ions from aqueous solutions, mainly attributed to ion exchange with SO42- groups.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)