Article
Chemistry, Physical
Somayeh Rahdar, Kaushik Pal, Leili Mohammadi, Abbas Rahdar, Yassman Goharniya, Somayeh Samani, George Z. Kyzas
Summary: In this study, copper oxide nanoparticles (CuO-NPs) were synthesized and used as adsorbents to remove nitrate ions from water sources. The optimization process was carried out using response surface modeling and the optimum conditions were determined. The results confirmed successful fitting of the model to Langmuir isotherm and second-order kinetics.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Physical
Pankaj Indurkar, Mrinmoy Mondal, Vaibhav Kulshrestha
Summary: In this study, a new Cu-doped BTC aerogel adsorbent was synthesized and used for the efficient removal of Pb(II) ions from aqueous solutions. By optimizing the experimental conditions, it was achieved that the adsorbent had a high removal efficiency of 99.96%. The adsorbent also showed good reusability and adaptability, making it a promising material for water treatment applications.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Environmental
Kabuyaya Kighuta, Anantha-Iyengar Gopalan, Dong-Eun Lee, Gopalan Saianand, Yao-Long Hou, Sung-Sik Park, Kwang-Pill Lee, Jun-Cheol Lee, Wha-Jung Kim
Summary: This study focused on the design and optimization of TiO2-ZnO composite using response surface methodology, with evaluation of photocatalytic NOx removal efficiency. Experimental results validated the RSM predictions, showing different efficiencies for NOx removal based on calcination temperature and ZnO weight percent. The best photocatalytic performance was observed in the composite with 2.1 wt % of ZnO calcined at 558°C.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Shu-Hui Liu, Ting-Jun Zhu, Chi-Wen Lin
Summary: In this study, a composite cathode was developed using response surface methodology (RSM) by compounding biochar produced from peanut shells with conductive carbon black (CCB), aiming to reduce the cost of cathode materials and improve the removal of copper ions from wastewater.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Metallurgy & Metallurgical Engineering
Hasan Movahhedi, Ashkan Mohammad Beygian, Eskandar Keshavarz Alamdari, Davood Moradkhani
Summary: Due to the scarcity of water, wastewater from hydrometallurgical processes has been recognized as a valuable resource for recovery or reuse. This study evaluated a method for reusing hydrometallurgical raffinate in the leaching of low-grade oxide copper ore, and found optimal conditions for the leaching process using response surface methodology. A two-unit counter-current leaching system was then adopted to maximize copper dissolution, increasing overall leaching efficiency by up to 80%.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY REVIEW
(2023)
Article
Thermodynamics
W. M. Farouk, A. S. Abdullah, Suha A. Mohammed, Wissam H. Alawee, Z. M. Omara, F. A. Essa
Summary: This study introduces a mathematical model to predict the thermal performance of pyramid solar distiller (PSD) using response surface methodology (RSM). It considers different environmental parameters and nanoparticle types and concentrations. The results demonstrate that Cu2O-PSD, Al2O3-PSD, and TiO2-PSD have higher productivity compared to conventional PSD.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Iman Kattoof Harith
Summary: This study aimed to produce a quaternary blended cement with high performance in terms of sustainability, mechanical properties, and durability. Fly ash, glass powder, and nanosilica were used as supplementary cementitious materials (SCMs). The optimal dosages of the SCMs were determined to maximize compressive strength and minimize chloride ion penetration, while reducing the cement content. The results showed that nanosilica and glass powder content significantly affected the compressive strength, while fly ash content had a negligible effect. Fly ash, nanosilica, and glass powder contents were found to have significant effects on the resistance against chloride ions. An optimal mixture containing 20% fly ash, 1.9% nanosilica, and 15% glass powder as partial replacements of cement resulted in a sustainable concrete with the lowest cement content, 46.56 MPa compressive strength, and 688.98-C total chloride ion passing at 28-day age.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Physical
Gaurab Kumar Ghosh, Ankit Kotia, Niranjan Kumar, Subrata Kumar Ghosh
Summary: This study experimentally evaluated the rheological characteristics of graphene-gear oil nanolubricant under varying conditions, using Response Surface Methodology. The results showed that the nanolubricant exhibited different viscosity values under different combinations of concentration, temperature, and shear rate. A mathematical correlation was proposed to predict the relative viscosity, which closely resembled the experimental data.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Green & Sustainable Science & Technology
Salim Rashid Salim Alalyani, Nageswara Rao Lakkimsetty, Feroz Shaik, M. J. Varghese
Summary: The demand for alternate fuels/biofuels is increasing rapidly to counter the adverse economic and environmental impacts created by conventional fossil fuels. This study focused on the production of bioethanol from corn starch, with factors such as substrate loading, temperature, pH, reaction time, and enzyme titer studied for their influence on bioethanol yield. A central composite design using response surface methodology was employed to optimize these factors, resulting in a bioethanol yield of 98.3%. The experimental results were in good agreement with the predicted values.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2023)
Article
Chemistry, Inorganic & Nuclear
Simona Gabriela Muntean, Liliana Halip, Maria Andreea Nistor, Cornelia Pacurariu
Summary: This paper presents the efficient application of a carbon magnetic nanocomposite as an adsorbent for the elimination of metal ions (copper, lead and zinc) from aqueous solutions. The study used a Box-Behnken factorial design combined with response surface methodology to investigate the effect and interactions of three variables on the pollutant removal process. The results showed high removal efficiencies and the applicability of the magnetic carbon nanocomposite for wastewater treatment.
Article
Engineering, Chemical
Sangeetha Jayaraman, R. Sharmil Suganya, Thiruvengadam Venugopal
Summary: Three types of activated carbon were prepared and analyzed for their ability to remove methylene blue dye. The results showed that all the activated carbon had a similar functional group and exhibited effective adsorption of methylene blue. The activated carbon also had a high surface area and suitable pore size for the removal of the dye.
DESALINATION AND WATER TREATMENT
(2023)
Article
Food Science & Technology
Izabela Staniszewska, Konrad W. Nowak, Danuta Zielinska, Iwona Konopka, Magdalena Zielinska
Summary: The aim of this study was to determine the optimal parameters of pulsed vacuum osmotic dehydration (PVOD) of fermented beetroot slices. The response surface methodology (RSM) was employed to optimize PVOD and improve the efficiency of the process. The optimum parameters were found to be a temperature of 20℃, sugar concentration of 60%, vacuum impregnation time of 10 minutes, and slice thickness of 6 mm.
FOOD AND BIOPROCESS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Khalid Aziz, Faissal Aziz, Rachid Mamouni, Layla Aziz, Nabil Saffaj
Summary: A new biocomposite material based on polyaniline and Brachychiton populneus shells (BP@PANI) was synthesized successfully through in situ chemical polymerization. The BP@PANI material showed effective adsorption of thiabendazole (TBZ) and methyl parathion (MP) pesticides from wastewater and demonstrated excellent recyclability.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Zeynab Naserifard, Mahmood Niad, Saeid Zarei
Summary: In this study, a nanomagnetic biocomposite sorbent was synthesized by extracting cellulose from Cystoseria myricaas algae collected from the Persian Gulf and combining it with Fe3O4 nanoparticles. Various characterization techniques were used to analyze the composite material, and the effects of different factors on the nanomagnetic biocomposite were studied. The optimal conditions for copper uptake were determined using response surface methodology.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Polymer Science
Jean Flores-Gomez, Victor Hugo Romero-Arellano, Milton Vazquez-Lepe, Alvaro de Jesus Martinez-Gomez, Juan Morales-Rivera
Summary: In this paper, a model for Cr (VI) removal and optimization was developed using a novel aerogel material, chitosan-resole CS/R aerogel. The aerogel was fabricated using freeze-drying and thermal treatment, which ensured a stable network structure despite non-uniform ice growth. Computational techniques were used to model and optimize the adsorption capacity of the aerogel. The developed model successfully described the process and was optimized to achieve superior Cr (VI) removal under specific conditions.
Article
Chemistry, Physical
Maria Harja, Carmen Teodosiu, Dorina Nicolina Isopescu, Osman Gencel, Doina Lutic, Gabriela Ciobanu, Igor Cretescu
Summary: Fly ash wastes can be effectively used in concrete formulation as a replacement for cement, by undergoing an alkali activation process. The study investigated the relationship between the processing conditions, particle characteristics, and compressive strength values of the concrete. The results showed that the processed fly ash can be a suitable potential building material, solving waste disposal issues and reducing cement consumption.
Article
Green & Sustainable Science & Technology
Ali Dawood Salman, Tatjana Juzsakova, Moayyed G. Jalhoom, Phuoc-Cuong Le, Thamer Adnan Abdullah, Igor Cretescu, Endre Domokos, Van-Huy Nguyen
Summary: This study explores the use of novel extractants, including 15-crown-5, 12-crown-4, cryptand 2.2.2, and DC18-crown-6, to separate and recover scandium from aqueous media. The results show high selectivity for scandium in 15-crown-5, 12-crown-4, and cryptand 2.2.2, making them valuable in the processing industry of rare earth elements. The pH value of the aqueous solution significantly affects the extraction efficiency and selectivity.
JOURNAL OF SUSTAINABLE METALLURGY
(2022)
Article
Chemistry, Physical
Nisrine Nouj, Naima Hafid, Noureddine El Alem, Ingrid Ioana Buciscanu, Stelian Sergiu Maier, Petrisor Samoila, Gabriela Soreanu, Igor Cretescu, Catalina Daniela Stan
Summary: Cuttlefish bone liquid waste was used as a biocoagulant to treat food industry wastewater in this study, and the waste was quantitatively characterized. The results showed that the waste contained sufficient soluble chitin fractions for food wastewater treatment. Satisfactory removal efficiencies were achieved under optimal conditions through process optimization.
Review
Chemistry, Physical
Ali Dawood Salman, Tatjana Juzsakova, Saja Mohsen, Thamer Adnan Abdullah, Phuoc-Cuong Le, Viktor Sebestyen, Brindusa Sluser, Igor Cretescu
Summary: This article discusses in detail the recovery of scandium from wastes and various resources using solvent extraction. The metallurgical extractive procedures for scandium recovery are presented, and different ways to improve extraction efficiency are explored. The article also emphasizes the important role of different operational parameters in the extraction process.
Article
Environmental Sciences
Catalina Nutescu Duduman, Consuelo Gomez de Castro, Gabriela Antoaneta Apostolescu, Gabriela Ciobanu, Doina Lutic, Lidia Favier, Maria Harja
Summary: In this study, Ag-doped TiO2 nanoparticles were synthesized using the sol-gel method and tested for photocatalytic degradation of methylene blue. The experimental results showed that the addition of a photosensitizer increased the degradation efficiency of TiO2-Ag. A parametric study revealed the optimal photocatalyst dose and methylene blue concentration. Acetone was found to modify the photodegradation mechanism and enhance the degradation performance. The recycling tests demonstrated the high photocatalytic stability of calcined TiO2-Ag material.
Article
Chemistry, Inorganic & Nuclear
Maria Harja, Nicoleta Lupu, Horia Chiriac, Dumitru-Daniel Herea, Gabriela Buema
Summary: The effectiveness of a Fe3O4-loaded fly ash composite for the adsorption of Congo red dye was studied in this research. The magnetic adsorbent was characterized by various techniques, and the results showed good saturation magnetization and superparamagnetic behavior. Factors such as dose, initial concentration, and contact time were found to influence the removal of Congo red dye. The Freundlich adsorption isotherm and pseudo-second-order kinetic model provided the best fit for the experimental data. The maximum adsorption capacity of Congo red dye was reported to be 154 mg/g using the proposed magnetic adsorbent. Further characterization of the adsorbent after adsorption was also conducted.
Article
Environmental Sciences
Lidia Favier, Andrei-Ionut Simion, Raluca Maria Hlihor, Ildiko Fekete-Kertesz, Monika Molnar, Maria Harja, Christophe Vial
Summary: Heterogeneous photocatalysis is a promising technique for the removal of the biorefractory water pollutant clofibric acid. The study demonstrates that the efficiency of photocatalytic degradation can be significantly improved through response surface methodology-based optimization. The optimal photocatalytic conditions achieved approximately 70% carbon mineralization for a pollutant concentration of 1.5 mg/L, catalyst concentration of 0.61 g/L, and irradiation time of 190 min. Furthermore, nitrate was found to have a positive effect on pollutant removal, while hydrogenocarbonates slowed down the elimination process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Physical
Nicolae Apostolescu, Ramona Elena Tataru Farmus, Maria Harja, Mihaela Aurelia Vizitiu, Corina Cernatescu, Claudia Cobzaru, Gabriela Antoaneta Apostolescu
Summary: CeO2/ZnO-based photocatalytic materials were synthesized by the sol-gel method to establish heterojunctions and enhance the degradation efficiency of certain antibiotics. The optimal catalyst concentration for chlortetracycline was determined to be 0.05 g/L, while for ceftriaxone it was 0.05 g/L. CeO2/ZnO assemblies showed superior degradation efficiency compared to individual ZnO or CeO2. Sample S3 demonstrated good photocatalytic properties for the elimination of ceftriaxone and tetracycline in both single and binary solutions. This study offers new insights into the identification of potent and cost-effective photocatalysts for wastewater treatment.
Article
Chemistry, Physical
Tatjana Juzsakova, Ali Dawood Salman, Thamer Adnan Abdullah, Rashed Taleb Rasheed, Balazs Zsirka, Rasha R. Al-Shaikhly, Brindusa Sluser, Igor Cretescu
Summary: The purpose of this study was to develop and test low-cost materials capable of removing methylene blue dye from water and wastewater by adsorption. The materials included silica gel powder (SG), silica gel mixed with eggshell powder (SG-ES), and a mixture of silica gel with sand from the western Iraqi desert (SG-SI). The developed silica gel with eggshell was found to be a good, cost-effective alternative to commercially available activated-carbon-based adsorbents. Different kinetic and isotherm models were applied to the experimental data, and a pseudo-second-kinetics-order model and the Freundlich model were found to be the most suitable for describing the adsorption process.
Article
Environmental Sciences
Maria Harja, Ramona Carla Ciocinta, Gabrijel Ondrasek, Daniel Bucur, Marcel Dirja
Summary: This study analyzed the bioaccumulation of heavy metal ions in plants of spontaneous flora. Soil samples from an urban area were analyzed for heavy metal ion content. The results showed that certain plants, such as B. juncea, have a high ability to accumulate and transfer heavy metals. Some plants, like mint and nettle, had increased levels of specific heavy metals, while others had low levels of toxic metals. The study recommended harvesting and using plants from soils that do not contain heavy metal ions.
Article
Environmental Sciences
Mustafa S. Mohammed, Shurooq T. Al-Humairi, Riyadh S. Al-Mukhtar, Saja Mohsen Alardhi, Auwal Aliyu, Ali Dawood Salman, Miklos Jakab, Forat Yasir AlJaberi, Brindusa Sluser, Igor Cretescu
Summary: Numerous recent studies have shown that discharging colored wastewater into the environment causes contamination, which has adverse impact due to textile, dyeing, and food industries. The current study presents experimental research on the clathrate hydrate technique used for producing pure water from of wastewater contaminated by dyes. The results showed that the povidone-iodine removal efficiency ranged between 86% and 92%, and the potassium permanganate removal efficiency ranged between 90% and 95%.
Article
Green & Sustainable Science & Technology
Leonid Vasiliu, Osman Gencel, Ioan Damian, Maria Harja
Summary: The co-incineration of tires waste in cement plants has multiple benefits including saving raw materials, reducing CO2 emissions, recovering thermal energy from waste with high energy content, and reducing waste disposal.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2023)
Article
Environmental Sciences
Mariana Diaconu, Gabriela Soreanu, Catalin Dumitrel Balan, Ingrid Ioana Buciscanu, Vasilica Maier, Igor Cretescu
Summary: Aquatic ecosystems polluted by heavy metals can affect microalgae growth. Microalgae exhibit metal tolerance and can accumulate a diversity of metal species. Spirulina platensis has biosorption ability for heavy metals like Zn, Cd, Pb, or Cr, making it useful for bioremediation. This study investigated the influence of heavy metal ions on S. platensis and its limitations in bioremediation.
Article
Energy & Fuels
Gokhan Hekimoglu, Ahmet Sari, Osman Gencel, Yunus Onal, Abid Ustaoglu, Ertugrul Erdogmus, Maria Harja, V. V. Tyagi
Summary: This study presents a leak-proof composite with enhanced properties by impregnating bio-based phase change materials into a cement-pumice based mortar matrix. The experimental results show that the composite exhibits lower mechanical strength but excellent thermal regulation and energy storage performance. Therefore, this composite material has potential applications in energy-efficient construction materials to improve the thermal performance of buildings.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Environmental Sciences
Mariana Diaconu, Irina Volf, Igor Cretescu, Tatjana Juzsakova, Gabriela Soreanu
Summary: This study investigates the coupling of VOC-degraders and microalgae for enhanced C-capture in air treatment biosystems. Results suggest that the co-immobilized consortium of microalgae and bacteria is the most suitable solution for biomass production and efficient removal of pollutants.
ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL
(2022)