Article
Polymer Science
Nouf F. Al-Harby, Ebtehal F. Albahly, Nadia A. Mohamed
Summary: A novel uracil-modified chitosan (UCs) adsorbent has been successfully synthesized and its structure and adsorption performance have been studied. The results show that the adsorption capacity of UCs for anionic Congo Red dye is related to factors such as solution pH, dye concentration, and temperature. The adsorption process follows pseudo-second order and Elovich models, and involves multiple steps. The isotherm analysis indicates that the adsorption of CR dye by UCs follows the Langmuir model, suggesting monolayer adsorption. Thermodynamic analysis shows that the adsorption process is endothermic and leads to increased randomness in the system.
Article
Biochemistry & Molecular Biology
Perumal Karthikeyan, Sankaran Meenakshi
Summary: A novel and environmentally-friendly chitosan encapsulated magnetic kaolin beads were fabricated and applied for the adsorption of phosphate and nitrate ions from water in this study. The synthesized beads showed promising potential as selective and effective adsorbents for the removal of phosphate and nitrate ions from aqueous solutions.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Polymer Science
Nouf F. Al-Harby, Ebtehal F. Albahly, Nadia A. Mohamed
Summary: The novel CCs adsorbent, prepared via a four-step procedure, shows high adsorption capacity for CR dye and fits multiple kinetic and isotherm models. The adsorption process is endothermic, spontaneous, and involves multiple steps. Desorption efficiency remains high after several cycles.
Article
Chemistry, Multidisciplinary
C. Arab, R. El Kurdi, D. Patra
Summary: Zn(Cur)O NPs were synthesized and characterized, with adsorption increasing as the nanoparticle amount increases and dye concentration decreases. An acidic medium was found to improve the adsorption process.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Elias Mosaffa, Dhruvi Patel, Nasim Amiri Ramsheh, Rishikumar Indravadan Patel, Atanu Banerjee, Hossein Ghafuri
Summary: In this study, a unique 3D bead structure of adsorbent, composed of bacterial cellulose microfilaments reinforced chitosan adorned with melamine 2D plates, was synthesized for anionic dye removal. The adsorbent showed high specific surface area and abundant functional groups, resulting in exceptional adsorption capacity. The characteristics and optimal conditions of the adsorbent were assessed and analyzed.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2024)
Article
Environmental Sciences
K. Kayalvizhi, N. M. Alhaji, D. Saravanakkumar, S. Beer Mohamed, K. Kaviyarasu, A. Ayeshamariam, Amal M. Al-Mohaimeed, Mohamed Ragab AbdelGawwad, Mohamed S. Elshikh
Summary: This study investigated the adsorption behavior of biomaterial activated Sawdust-Chitosan nanocomposite beads on Ni (II) and Cu (II) ions removal from aqueous solutions. The structural analysis and surface morphology were evaluated using PXRD, TEM, and EDAX techniques, while the functional groups behavior was discussed using FTIR technique. The adsorption properties were determined using isotherm models and the maximum adsorption capacity was inferred.
ENVIRONMENTAL RESEARCH
(2022)
Article
Multidisciplinary Sciences
Meiyan Wu, Yidong Zhang, Xiaoyan Feng, Fei Yan, Qian Li, Qiu Cui, Bin Li
Summary: Cationic cellulose nanofibrils (CCNF)/sodium alginate (SA) beads with porous internal structure were prepared and used to adsorb Congo red. The maximum adsorption capacity reached 518.4 mg/g, which was superior to most cellulose-based adsorption materials. Physical adsorption, dominated by hydrogen bond and electrostatic adsorption, was proposed as the main adsorption mechanism. The beads showed high Congo red removal efficiency even after multiple cycles.
Article
Chemistry, Applied
Yuru Yang, Lei Zeng, Zongkun Lin, Huabin Jiang, Aiping Zhang
Summary: A chitosan-based bead was synthesized by crosslinking and sulfhydryl modification reaction, with good removal ability for heavy metal ions Pb2+, Cu2+, and Cd2+. The adsorption process of the beads fits the Langmuir isotherm model and pseudo second-order kinetics model.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Multidisciplinary
Muhammad Ali Abbasi, Abdul Rehman, Zeeshan Ali, Muhammad Atif, Zulqurnain Ali, Waqas Khalid
Summary: Phase-pure La-doped bismuth ferrite (La-BFO) nanostructures were successfully synthesised using a wet chemical method. The La-BFO exhibited excellent adsorption performance for anionic Congo red, with an increasing doping concentration of La leading to higher adsorption capacity and removal efficiency. The initial pH of the solution strongly influenced the adsorption capacity.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Biochemistry & Molecular Biology
Reda M. Abdelhameed, Mahmoud El-Shahat, Hassan Abdel-Gawad, Bahira Hegazi
Summary: The current paper describes the application of newly formulated beads from copper-benzenetricarboxylate (Cu-BTC), polyacrylonitrile (PAN), and chitosan (C), Cu-BTC@C-PAN, C-PAN, and PAN, for the removal of phenolic chemicals from water. The adsorption optimization of 4-chlorophenol (4-CP) and 4-nitrophenol (4-NP) using beads was studied, including the effects of various experimental factors. The Langmuir model and pseudo-second-order kinetic equation were found to be suitable for explaining the adsorption isotherms and kinetics of the system. Cu-BTC@C-PAN beads showed higher adsorption capacities compared to PAN for both 4-CP and 4-NP.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Environmental Sciences
Ahmed Hamd, Doaa Salah, Huda Fadol Alyafei, Nofal K. Soliman, Ahmed A. M. El-Reedy, Ali M. Elzanaty, Sameerah I. Al-Saeedi, Azza Al-Ghamdi, Mohamed Shaban, Refat El-Sayed, Sayed A. Ahmed
Summary: This study explored the adsorption of Congo red dye from textile effluent using natural clay glauconite as a sustainable and inexpensive adsorbent. The effects of varying concentrations of sodium hydroxide on glauconite alteration were examined, and the optimal NaOH concentration that improves removal efficiency and adsorption capacity was determined. The results showed that the CR removal efficiency increased with modification up to a 2 M NaOH activation. The analysis of kinetics and isotherms of CR adsorption revealed that the Freundlich isotherm closely matched the experimental results, and the pseudo-second-order model explained the obtained results accurately. The investigation on reusability demonstrated that the adsorbents could be efficiently reused. Overall, glauconite and its NaOH-activated forms are effective and affordable adsorbents for removing CR from textile effluent.
Article
Acoustics
Furong Hou, Danli Wang, Xiaobin Ma, Lihua Fan, Tian Ding, Xingqian Ye, Donghong Liu
Summary: Chitin suspensions treated with enzymolysis and sonoenzymolysis showed improved adsorption properties for Congo red dyes, with Langmuir isotherm and pseudo-second order model being more reliable in describing the adsorption process. Thermodynamic studies indicated a spontaneous adsorption process, with physical adsorption between chitin and CR confirmed through structural characterization before and after adsorption. Sonoenzymolysis resulted in a larger specific surface area and higher porosity, providing more active sites for adsorption.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Qin Qin, Mei Li, Ping Lan, Yexin Liao, Shouxiang Sun, Hongquan Liu
Summary: Chitin aerogel doped with nano-calcium carbonate was prepared and showed good adsorption properties for Congo Red. The adsorption capacity was influenced by initial concentration and pH, with adsorption kinetics controlled by liquid film diffusion and intra-particle diffusion.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Environmental Sciences
Dianjia Zhao, Xizhou Shen
Summary: Novel eco-friendly cross-linked chitosan-diatomite/calcium alginate (CS-DE@CA) composite hydrogel beads were successfully prepared for water purification. The CS-DE@CA exhibited higher removal efficiencies for Congo red compared to DE@CA, and the adsorption capacity increased with the starting concentration of Congo red. The adsorption process was dominated by chemisorption, and the as-prepared sorbent maintained exceptional adsorption capacity after multiple adsorption-desorption cycles.
Article
Polymer Science
Jorge Lozano-Montante, Raquel Garza-Hernandez, Mario Sanchez, Edgar Moran-Palacio, Guillermo Nino-Medina, Mario Almada, Luis Hernandez-Garcia
Summary: This study successfully achieved the adsorption of Pb(II) ions in water by cellulose derivatives, and identified that cellulose composite materials cross-linked with chitosan modified with 2-methylpyridine and succinic anhydride have higher adsorption capacities. Kinetic data showed a pseudo-second-order behavior in the adsorption process.
Article
Biochemistry & Molecular Biology
Mayur K. Vekariya, Rajesh H. Vekariya, Pathik S. Brahmkshatriya, Nisha K. Shah
CHEMICAL BIOLOGY & DRUG DESIGN
(2018)
Article
Chemistry, Multidisciplinary
Mayur K. Vekariya, Rajesh H. Vekariya, Kinjal D. Patel, Nirav P. Raval, Prapti U. Shah, Dhanji P. Rajani, Nisha K. Shah
Article
Chemistry, Physical
Mayur K. Vekariya, Dhaval B. Patel, Pranav A. Pandya, Rajesh H. Vekariya, Prapti U. Shah, Dhanji P. Rajani, Nisha K. Shah
JOURNAL OF MOLECULAR STRUCTURE
(2019)
Article
Engineering, Environmental
Nirav P. Raval, Manish Kumar
Summary: This study focuses on the removal of arsenate from groundwater using bilayer-oleic coated iron-oxide nanoparticles. The adsorbent showed efficient removal of arsenate at neutral pH, following pseudo-second-order kinetics and Freundlich isotherm models. Regeneration and competition studies supported the potential field application of the proposed adsorbent.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Nirav P. Raval, Santanu Mukherjee, Nisha K. Shah, Petros Gikas, Manish Kumar
Summary: The study shows that chemically cross-linked chitosan microsphere can effectively remove dyes from wastewater, with the best removal efficiency at 69.40 and 148 mg g(-1) under certain experimental conditions. The removal rates of different dyes vary under optimal conditions, as shown by adsorption isotherm and kinetics analysis. Parameters like temperature, pH, initial concentration, adsorbent dosage, and contact time have significant impacts on the removal efficiency.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Kaling Taki, Nirav P. Raval, Manish Kumar
Summary: Magnetized geopolymer showed enhanced sorption capacity for As(V) compared to unmodified geopolymer, particularly at near neutral pH; The sorption process onto magnetized geopolymer was influenced by intraparticle diffusion and surface complexation mechanisms; Regeneration of exhausted composite adsorbent was achieved using 0.1 M NaOH for up to five cycles of sorption-desorption-regeneration.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Manish Kumar, Kiran Dhangar, Alok Kumar Thakur, Bhagwana Ram, Tushara Chaminda, Pradeep Sharma, Abhay Kumar, Nirav Raval, Vaibhav Srivastava, Jorg Rinklebe, Keisuke Kuroda, Christian Sonne, Damia Barcelo
Summary: The ongoing COVID-19 pandemic has led to an increase in the consumption of antimicrobial substances, subsequently resulting in higher prevalence of antidrug resistance in Escherichia coli (E. coli) in ambient water bodies. The rise in ADR, particularly towards non-fluoroquinolone drugs, is associated with effective SARS-CoV-2 gene copies and may pose a risk even in areas where wastewater treatment plants show less increase in ADR.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Manish Kumar, Santanu Mukherjee, Alok Kumar Thakur, Nirav Raval, Alicia Kyoungjin An, Petros Gikas
Summary: The study demonstrates the effectiveness of impregnating organosilane into quartz sand particles for treating arsenic-polluted water, with increased removal efficiency through chemisorption. The optimal dosage of adsorbent is 10 g/L, and chemical adsorption and charge/ion-dipole interaction are found to be possible mechanisms for arsenate removal.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Agricultural Engineering
Nirav P. Raval, Manish Kumar
Summary: This study focuses on developing a novel biosorbent for removing arsenate from water resources. The biosorbent showed high adsorption capacity and can effectively remove different types of contaminants. This research is significant for addressing water pollution issues.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Kiran Dhangar, Manish Kumar, Marwan Aouad, Jurgen Mahlknecht, Nirav P. Raval
Summary: This study investigated the influences of ionic strengths, valence, metals, and organic substances on the size and zeta potential of BC-NPs in aquatic systems. The results showed that strong ionic strength promotes aggregation of BC-NPs until repulsion forces become dominant due to more negative zeta potential. The aggregation of BC-NPs depended on the ionic valence, with divalent ions causing more aggregation than monovalent ions. Metal ions at higher concentration promoted the aggregation rate of BC-NPs, with Cu+2 being the most dominant metal.
Article
Biochemistry & Molecular Biology
Gautam Priyadarshi, Nirav P. Raval, Mrugesh H. Trivedi
Summary: The textile/dyeing industries are known for their high water consumption and the resulting contamination of water bodies with dye-laden effluent. This study proposed a fast method for synthesizing a nanocomposite adsorbent (C-CS@ZnO) using microwave-assisted synthesis. The sorbent showed a high sorption capacity for methyl orange dye and demonstrated potential for large-scale textile effluent treatment. This research is significant for addressing the environmental impact of textile/dyeing industries.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Agricultural Engineering
Rahul Silori, Jian Zang, Nirav P. Raval, Balendu Shekher Giri, Juergen Mahlknecht, Abrahan Mora, Jaime Duenas-Moreno, Syed Mohammad Tauseef, Manish Kumar
Summary: This study produced carbon-negative biochar from the pyrolysis of sawdust biomass alone and from the co-pyrolysis of sawdust and plastic waste. The pyrolyzed biochar showed better removal efficiencies for ciprofloxacin and sulfamethoxazole compared to the co-pyrolyzed biochar. The adsorption process involved mechanisms such as H bonding, electrostatic interactions, and 7C-7C electron donor-acceptor interactions, and followed a pseudo-second-order kinetic model.
BIORESOURCE TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mrugesh Trivedi, Chirag N. Patel, Druma Vaidya, Nirav P. Raval, Manish Kumar
Summary: The study aimed to investigate the effects of BPA on DNA damage and cytotoxicity in HepG2 cell line at concentrations ranging from 0.02-200μg/mL, as well as the ameliorating effect of GA (10-50μg/mL). The results showed that BPA was not genotoxic and cytotoxic at low dose exposure (0.02μg/mL), but induced significant DNA damage and cytotoxicity in a dose-dependent manner at concentrations of 2-200μg/mL. However, the addition of GA (10-50μg/mL) with BPA (200μg/mL) inhibited DNA damage and cytotoxicity.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Engineering, Environmental
Nirav P. Raval, Gautam Priyadarshi, Santanu Mukherjee, Hiral Zala, Dhaouadi Fatma, Adrian Bonilla-Petriciolet, Ben Lamine Abdelmottaleb, Laurent Duclaux, Mrugesh H. Trivedi
Summary: The development of cost-effective adsorbents for dye removal in wastewater purification is a growing and important area of research. This study focuses on the preparation of zinc-oxide nanoparticles impregnated chitosan nanocomposite beads for the removal of Eriochrome BlackT dye. Results demonstrate that the microwave-assisted preparation of the composite beads provides the highest adsorption capacities and removal efficiency. The novelty of this study lies in the easy preparation method and the high adsorption capacity, mechanical strength, and specific surface area of the composite material, which effectively remove dye molecules from textile wastewater.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)