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
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
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
Environmental Sciences
Seyed Vahid Mousavi, Parham Joolaei Ahranjani, Sara Farshineh Saei, Naser Mehrdadi, Gholamreza Nabi Bidhendi, Binta Hadi Jume, Shahabaldin Rezania, Amin Mojiri
Summary: The present study developed and evaluated nano-adsorbents based on zirconium oxide and graphene oxide as a novel adsorbent for the efficient removal of ammonia from industrial effluents. Various parameters were optimized and kinetic models and adsorption isotherms were used to verify the efficiency of the adsorbent.
Article
Chemistry, Physical
Imran Ali, Alexander Babkin, Irina Burakova, Alexander E. Burakov, Elena A. Neskoromnaya, Alexey G. Tkachev, Stefan Panglisch, Najla AlMasoud, Taghrid S. Alomar
Summary: The study investigated the use of graphene oxide/polyhydroquinone nanocomposite for the removal of samarium ions in aqueous solutions. Various parameters such as sorption and desorption were analyzed, and the maximum sorption capacity was determined using Langmuir model. The method shows potential for efficient purification and remediation of hydrogeosystems containing rare earth elements, including samarium ions.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
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
Chemistry, Physical
Mohamed E. Mahmoud, Rehab M. El-Sharkawy, Ghada A. A. Ibrahim
Summary: Immobilized biosorbents with enzymes have shown great potential in the fields of environmental and energy science. In this study, a magnetic bionanocomposite was successfully synthesized by covalently immobilizing lipase onto a supporting matrix of magnetic graphene oxide-immobilized-cellulose. The as-synthesized bionanocomposite exhibited excellent adsorption performance for the removal of methylene blue and malachite green from water. The results highlight the promising application of the magnetic bionanocomposite as a green material for the efficient removal of environmental dye pollutants.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Hadeel Saad, F. A. Nour El-Dien, Nadia E. A. El-Gamel, Ahmed S. Abo Dena
Summary: Water contamination is a serious global issue due to the depletion of water resources suitable for drinking and agriculture. Researchers have developed a magnetic adsorbent nanomaterial for removing the anionic dye bromocresol green from wastewater. The adsorbent has high adsorption capacity and can be easily removed using a strong magnetic field.
Article
Environmental Sciences
Wei Chen, Jingde Luan, Xiaokun Yu, Xueqin Wang, Xin Ke
Summary: Polystyrene @ graphene oxide layered composite microspheres (Pst@GO) were prepared using Pickering emulsion method for the removal of dye pollutants from water solution. The presence of folds on the surface of Pst@GO improved its adsorption capacity.
ENVIRONMENTAL TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Sanny Verma, Mallikarjuna N. Nadagouda
Summary: The review discusses the progress made in the past eight years in utilizing graphene-based composites for phosphorus removal from wastewater through adsorption. It highlights adsorption as a simple and effective method with environmental benefits, cost-effectiveness, and a variety of adsorbent materials.
Article
Materials Science, Multidisciplinary
Mohamed E. Mahmoud, Mohamed F. Amira, Mayar M. H. M. Azab, Amir M. Abdelfattah
Summary: Novel nanocomposite NH2-Fe3O4-GO-MnO2-NH2 was synthesized for efficient removal of Congo red dye, demonstrating excellent extraction percentages (96-100%) and showing high potential in water remediation for dye removal.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Engineering, Chemical
Rafal Sitko, Marcin Musielak, Maciej Serda, Ewa Talik, Beata Zawisza, Anna Gagor, Malgorzata Malecka
Summary: A superior nanoadsorbent (GO-TSC) for highly effective removal of mercury ions from water solutions was developed by grafting thiosemicarbazide molecules onto graphene oxide nanosheets. The adsorption on GO-TSC is significant across a broad pH range, with a maximum adsorption capacity of 231 mg g(-1) at pH 3.5 and impressive selectivity towards Hg(II) ions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Xianlu Feng, Bin Qiu, Yan Dang, Dezhi Sun
Summary: The study demonstrated that the β-cyclodextrin-immobilized reduced graphene oxide composite exhibited excellent adsorption performance for naproxen in aquatic environments. The adsorption process followed pseudo-second-order kinetics and the Langmuir adsorption model, with main mechanisms involving host-guest interaction, hydrogen bonding, and π-π interactions. Additionally, the composite could be regenerated with ethanol after use.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Franciele da Silva Bruckmann, Tais Zuchetto, Cristian Mafra Ledur, Claudia Lange dos Santos, Willian Leonardo da Silva, Solange Binotto Fagan, Ivana Zanella da Silva, Cristiano Rodrigo Bohn Rhoden
Summary: This study focused on the removal of the drug methylphenidate from aqueous solutions using graphene derivatives as adsorbent materials. Theoretical and experimental methods were combined to analyze the adsorption process, showing that graphene oxide (GO) and reduced graphene oxide (rGO) have high adsorption capacities for methylphenidate, providing a promising alternative for the removal of drug contaminants from wastewater.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
S. Shadman, M. Massinaei, A. Zeraatkar Moghaddam
Summary: In this study, MCGO and MCNGO graphene-based magnetic nanocomposite adsorbents were synthesized for efficient removal of cyanide from aqueous solutions. The adsorption capacity of MCGO and MCNGO exceeded 93% and 98% respectively under optimal conditions, showing promising potential for practical applications.
Article
Energy & Fuels
Ebru Kurtulbas, Ayse Gizem Pekel, Irem Toprakci, Gulsum Ozcelik, Mehmet Bilgin, Selin Sahin
Summary: In this study, a carboxylic acid-based deep eutectic solvent was synthesized and used for removing diclofenac from water. The designed solvent system achieved an approximate 80% removal of diclofenac and was influenced by factors such as initial concentration, solvent level, and temperature.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Energy & Fuels
Selin Sahin, Ayse Gizem Pekel, Irem Toprakci
Summary: Sonication-assisted extraction was used to extract bioactive substance from Hibiscus sabdariffa. By optimizing the process conditions and designing a deep eutectic solvent, the maximum yield of total polyphenol was achieved. Water content was found to be the most important parameter, and the extraction process was studied through kinetics and evaluation of effective diffusivity.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Energy & Fuels
Ruya Samli, Zeynep Behrin Guven Aydin, Selin Sahin
Summary: This paper investigates the method of enriching sunflower and corn oil with polyphenols by adding olive leaf extracts. Eleven different computer modeling techniques were simulated and compared, and it was found that Artificial Neural Networks (ANN) were the most accurate method for predicting and optimizing total phenolic content after ultrasound-assisted extraction.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Energy & Fuels
Sah Ismail Kirbaslar, Selin Sahin
Summary: The valorization of biomass based on feedstock is essential for sustainability due to the finite nature of fossil fuels. In this study, olive tree by-products, specifically leaves, were investigated using microwave-assisted extraction to obtain extracts rich in phenolics, flavonoids, and antioxidant activity. The optimal extraction conditions were determined using a central composite design, resulting in high yields of these valuable compounds.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Energy & Fuels
Raneen Albarri, Irem Toprakci, Ebru Kurtulbas, Selin Sahin
Summary: In this study, microwave-assisted extraction was used to extract bioactive materials from Moringa oleifera leaves. The effects of extraction time, temperature, and power on the extraction process were investigated. The results showed that the extraction rate, diffusion coefficient, mass transfer coefficient, and Biot number increased with increasing temperature during the extraction process.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Energy & Fuels
Raneen Albarri, Selin Sahin
Summary: This study proposes a green extraction method using automated solvent extraction from the leaves of Moringa oleifera. By employing central composite design and response surface approach, the optimal conditions for achieving the highest total phenolic and flavonoid contents were determined. The results were validated through antioxidant activity tests using ABTS and DPPH assays, which showed a positive and satisfactory correlation with the findings.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Chemistry, Multidisciplinary
Irem Toprakci, Selin Sahin
Summary: The study evaluates the microcapsule technology of encapsulating olive leaf extract using alginate as coating. By experimental design and optimization, efficient encapsulation is achieved under the optimum conditions.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2022)
Article
Food Science & Technology
Zeynep Cigeroglu, Selin Sahin, Ebru Kurtulbas
Summary: This study compared the quality and shelf life of garlic oil using commercial and homemade products. Commercial products showed longer shelf life than homemade ones. The research findings contribute to assessing the storage stability of garlic-infused oils as herbal supplements.
JOURNAL OF FOOD PROCESSING AND PRESERVATION
(2022)
Article
Biochemical Research Methods
Ebru Kurtulbas, Selcuk Sevgen, Ruya Samli, Selin Sahin
Summary: This study aims to develop model equations to examine the stability of total phenolic material (TPM) and total anthocyanin (TA) in the sour cherry peel extract under different storage conditions. The results show that storing the samples at -20 degrees Celsius in the freezer provides the best stability.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2023)
Article
Biochemical Research Methods
Gulderen Cosgun, Keziban Kubra Gungor, Ferhan Balci-Torun, Selin Sahin, Mehmet Torun
Summary: This study aims to encapsulate 5-O-caffeoylquinic acid (chlorogenic acid) and caffeine extracted from coffee silver skin (CSS) using the spray drying method. Optimized conditions were found to be a spray drying inlet temperature of 190°C, extract concentration of 10 degrees Bx, and a wall material composition of modified starch/arabic gum (MS:AG) 10.5:9.5, which resulted in good drying yield and bioactive retention. The concentration stage could be utilized to produce free-flowing powdered particles for the food processing industry.
PHYTOCHEMICAL ANALYSIS
(2023)
Article
Food Science & Technology
Irem Toprakci, Mehmet Torun, Selin Sahin
Summary: The aim of this study is to recommend a preserving method of a natural plant extract for further food applications. Plum peel extract was used as active material source and encapsulated in alginate beads using ionic gelation. The optimized conditions for the highest encapsulation efficiency and antioxidant activity were determined to be 15% CaCl2, 1.44% alginate, and 18 min of hardening time. The beads showed perfect sphere morphology under microscope analysis but slightly deviated from perfect sphericity in shape analysis.
JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION
(2023)
Article
Food Science & Technology
Irem Toprakci, Mehmet Torun, Selin Sahin
Summary: This study aims to contribute to valorization approaches for recovery of high-value-added substances in environmentally friendly ways. Waste byproducts from a popular juice product (peel) were extracted using a GRAS solvent and preserved through encapsulation in alginate beads. Process conditions were optimized using statistical experimental design, resulting in nearly 80% encapsulation efficiency. The resulting capsules exhibited antioxidant properties and could potentially be used in food formulations. Morphological properties were also measured.
Article
Biochemical Research Methods
Irem Toprakci, Gulderen Cosgun, Ferhan Balci-Torun, Mehmet Torun, Selin Sahin
Summary: In this study, olive leaf extract was encapsulated in biodegradable and edible polymers using the spray drying method. The encapsulation system was optimized, and the encapsulated extract was tested for its bioavailability and potential as a functional food ingredient. The results showed that the encapsulated extract had high encapsulation efficiency, encapsulation yield, and antioxidant activity, indicating its potential application in preventing lipid oxidation and improving product quality.
PHYTOCHEMICAL ANALYSIS
(2023)
Article
Energy & Fuels
Keziban Kubra Gungor, Irem Toprakci, Ferhan Balci Torun, Mehmet Torun, Selin Sahin
Summary: Ginger extract was encapsulated in maltodextrin/modified starch microcapsules using spray drying. The optimal conditions were achieved with 20% (w/v) modified starch in the mixture, an inlet air temperature of 140.5?, and resulted in 400.09 mg/100 g total phenolics, 65.29% product yield, 98.32% solubility, and 25.84% Carr index. The release of bioactive content from the microcapsules was higher in the intestinal system than in the gastric system. Sunflower oil, when used as a model food product, showed increased oxidative stability, total phenolic content, and antioxidant activity when the microcapsules were added.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Biochemistry & Molecular Biology
Ferhan Balci-Torun, Irem Toprakci, Nahide Gulsah Deniz, Sinem Ortaboy, Mehmet Torun, Selin Sahin
Summary: Lemon peels were used as a source of volatile components in this study, and automatic solvent extraction was utilized for the recovery of limonene-rich citrus volatile extract for the first time. The process parameters were optimized using Box-Behnken design and response surface methodology, with the optimum conditions achieved at approximately 10 g fresh lemon peel, 15 min immersion time, and 13 min washing time. The identified major volatiles in the peel extract included alpha-terpinene, beta-pinene, citral, gamma-terpinene, and linalool. FT-IR and H-1- and C-13-NMR spectroscopies were used to verify the volatile compounds.
CHEMISTRY & BIODIVERSITY
(2023)
