Article
Chemistry, Physical
G. Montavon, S. Ribet, C. Bailly, Y. Hassan Loni, B. Made, B. Grambow
Summary: This study investigates the retention of U(VI) in intact Callovo-Oxfordian claystone in the context of radioactive waste management in deep geological formations. The experimental results indicate that temperature has an impact on the retention, with an increasing trend at higher temperatures. However, the adsorption model underestimates the temperature effect on U(VI) retention.
APPLIED CLAY SCIENCE
(2023)
Article
Chemistry, Physical
S. Ribet, F. Maia, C. Bailly, B. Made, B. Grambow, G. Montavon
Summary: The effect of temperature (20-80 degrees C) on U(VI) adsorption by Callovo-Oxfordian claystone (COx) in deep geological formations was studied. The study followed a step-by-step approach, starting with a single mineral and gradually increasing the complexity of the system. The temperature effect on U(VI) adsorption was found to be dependent on the study conditions and the speciation of U(VI) in solution.
APPLIED CLAY SCIENCE
(2023)
Article
Engineering, Environmental
Pramod Kumbhar, Dattatray Narale, Rakhee Bhosale, Chitra Jambhale, Jin-Hyeok Kim, Sanjay Kolekar
Summary: This study reports the synthesis and application of tea waste/Fe3O4 magnetic composite for the adsorption of crystal violet dye from aqueous solution. The composite showed high efficiency and adsorption capacity for the removal of CV dye. The adsorption process was found to be spontaneous and heat releasing.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Prabu Deivasigamani, P. Senthil Kumar, Sathish Sundaraman, Michael Rahul Soosai, A. Annam Renita, M. Karthikeyan, Nessipkhan Bektenov, Omirserik Baigenzhenov, D. Venkatesan, J. Aravind Kumar
Summary: This study successfully synthesized coffee husk activated carbon through chemical modification and demonstrated its effectiveness in removing Methylene blue dye from wastewater. The experimental variables, including dosage, pH, temperature, and contact time, were carefully adjusted to optimize the adsorption process. The results showed that chemical activation enhanced the adsorptive potential of coffee husk by increasing the number of pores and roughness.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Soheil Hamidi Tabrizi, Bahareh Tanhaei, Ali Ayati, Sara Ranjbari
Summary: In this study, the surface of montmorillonite K10 was successfully modified to Mt-HDA, resulting in improved removal efficiency of Tartrazine (TZ) from aqueous phase. The experimental results showed that HDA modification significantly enhanced the adsorption ability of montmorillonite towards TZ molecules, with fast adsorption process and maximum adsorption capacity of 59mg/g at 45 degrees C.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
L. Montes, E. Pavon, A. Cota, Alba
Summary: The study evaluated the influence of clay minerals on the retention of Zr(IV) in nuclear waste, and found three immobilization mechanisms including cation exchange, precipitation/crystallization, and chemical interaction. This is of significant importance for waste management and environmental risk control.
Article
Environmental Sciences
Esperanza Pavon, Maria D. Alba
Summary: This study aims to predict the immobilization behavior of zirconium by clay minerals and investigate the influence of factors such as zirconium cation nature, temperature, time, and pH on the immobilization process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
Sabha M. El-Sabbagh, Hamed I. Mira, Osman A. Desouky, Shimaa S. Hussien, Dina M. Elgohary, Anwaar O. Ali, Ahmed M. A. El Naggar
Summary: The efficacy of fungal chitosan-polystyrene-Co-nanocomposites (FCPNC) as a material for the adsorptive removal of cadmium (Cd) ions from aqueous solutions was assessed. The synthesis and characterization of FCPNC were accomplished using various analytical techniques. The results showed that FCPNC had a high adsorption capacity and excellent adsorption performance under different experimental conditions.
Review
Environmental Sciences
Shima Barakan, Valeh Aghazadeh
Summary: This review discusses the recent trends in using natural and modified clay minerals for removing toxic organic/inorganic pollutants over the last 30 years. Modification methods can improve the adsorption properties of clay minerals and have the potential to make a greater impact on environmental protection.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Shiyao Fan, Qi Xin, Yahui Zhang, Xu Zhao, Xinwei Liu, Xuanzhang Hao, Eming Hu, Hongqiang Wang, Junwen Lv, Zhiwu Lei, Qingliang Wang
Summary: This study proposed a new method for efficient and clean release of uranium and zirconium from hazardous uranium purification waste streams. By using alkali disaggregation coupled with acid leaching, the structure of the waste slag was destroyed, exposing the target elements. Under optimized conditions, the leaching rates of uranium and zirconium were enhanced to 99.12% and 96.77%, respectively, while the content of uranium and zirconium in the slags decreased significantly, meeting the internationally required clean release standard.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Christiana Mystrioti, Stefania Koursari, Anthimos Xenidis, Nymphodora Papassiopi
Summary: The study demonstrates that gallic acid is effective in rapidly reducing Cr(VI) to Cr(III) in mild acidic conditions, following 2nd order kinetics in the pH range 3-5, with a different reduction mechanism observed at pH 5 and pH 6.
Article
Materials Science, Multidisciplinary
Ai-li Yang, Sheng-ya Yang, Yu-kuan Zhu
Summary: The research developed a hybrid material using tea waste and graphene oxide for efficient uranium adsorption, achieving nearly 100% removal in 20 minutes. The material showed good reusability with an 85% removal rate after 5 cycles.
NEW CARBON MATERIALS
(2021)
Article
Environmental Sciences
Huimin Zhang, Steve Larson, John Ballard, Jing Nie, Qiqi Zhang, Joseph A. Kazery, Shaloam Dasari, Nihar Pradhan, Qilin Dai, Olanrewaju M. Olafuyi, Xianchun Zhu, Youhua Ma, Fengxiang X. Han
Summary: This study investigated the modification of clay minerals by exopolysaccharides (EPS) and its impact on uranium adsorption. The results showed that EPS could enhance the adsorption capacity of montmorillonite and kaolinite for U(VI). The adsorption capacity was affected by pH, sulfate, and phosphate.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Biochemistry & Molecular Biology
Jiali Gan, Dongdong Le, Qingliang Wang, Qi Xin, Eming Hu, Zhiwu Lei, Hongqing Wang, Hongqiang Wang
Summary: A physically crosslinked polyvinyl alcohol/phosphorylated chitosan (PPP) hydrogel electrode was designed using the freezing thawing method to improve the removal rate of uranium and reduce radioactive pollution. The PPP hydrogel showed excellent adsorption efficiency for uranium, with a treatment efficiency of 100% within 15 minutes for the absorption of 200 mL uranium tailings leachate. The PPP hydrogel exhibited good adaptability to a wide range of pH conditions and maintained an adsorption efficiency above 85% for a 950 mg/L uranium solution. The synergistic effect of various functional groups in the material, such as phosphate, hydroxyl, and ammonium, contributed to the adsorption capacity of PPP for uranium. Additionally, the electrochemical adsorption method significantly enhanced the adsorption performance of PPP hydrogel.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2024)
Article
Environmental Sciences
Xiaorong Song, Chenglin Li, Zhihui Chai, Yuan Zhu, Yuling Yang, Manyi Chen, Ruijia Ma, Xinquan Liang, Junhua Wu
Summary: In this study, diatomite was refined by a simple purification method of calcination combined with acid washing. The purified diatomite showed successful adsorption of gallic acid from molasses wastewater, providing a promising material for sugar mill wastewater pretreatment. The optimal purification conditions and adsorption characteristics were explored in detail, demonstrating the potential of purified diatomite as an effective adsorbent for GA removal.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Analytical
Ibrahim H. Zidan, Mohamed F. Cheira, Ahmed R. Bakry, Bahig M. Atia
Summary: In this study, uranium adsorption from sulphate solutions was performed using Duolite ES-467 aminophosphonic acid chelating resin. The optimal adsorption parameters were determined and the kinetic and thermodynamic behavior of the adsorption process were investigated. The optimized factors were applied to recover U(VI) from the leach liquor and produce a uranium concentrate.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Bahig M. Atia, Mohamed A. Gado, Mohamed F. Cheira, Hassan S. El-Gendy, Mohamed A. Yousef, Mohamed D. Hashem
Summary: In this study, a new amide was successfully synthesized using a poly phosphoric acid catalyst for the extraction of Th(IV) from ore samples in Egypt. The optimized factors were applied for the recovery of Th(IV), resulting in a thorium oxide concentrate with high purity.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Eman M. Allam, Taysser A. Lashen, Saeyda A. Abou El-Enein, Mohamed A. Hassanin, Ahmed K. Sakr, Mohamed F. Cheira, Aljawhara Almuqrin, Mohamed Y. Hanfi, M. I. Sayyed
Summary: This study presents a novel adsorbent, sodium diethyldithiocarbamate/polyvinyl chloride (DdTC/PVC), for rare earth element (REE) sorption, which has higher adsorption properties and easier synthesis compared to other sorbents. The three-liquid-phase extraction technique (TLPE) was used to separate REEs into three groups. The synthesized DdTC/PVC was characterized and the factors affecting the sorption process were analyzed. The desorption of rare earth ions from DdTC/PVC was also investigated. The extracted rare earth oxalate concentrate was utilized for further separation into three groups via TLPE. This technique is simple and suitable for extracting REEs.
Article
Chemistry, Physical
Ahmed K. Sakr, Ibrahim F. Al-Hamarneh, Hassanien Gomaa, Mostafa M. Abdel Aal, Mohamed Y. Hanfi, M. I. Sayyed, Mayeen Uddin Khandaler, Mohamed F. Cheira
Summary: This study investigates the use of clay as an adsorbent for uranium extraction from nuclear effluent. The experiments show that optimizing pH value, agitation time, clay dosage, initial uranium ions concentration, and system temperature can enhance the adsorption efficiency. The new adsorbent has an uptake capacity of 175.10 mg g-1 and is most effective at pH 4.5, 60 minutes, and 25 degrees C.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Polymer Science
Bahig M. Atia, Ahmed K. Sakr, Mohamed A. Gado, Hassan S. El-Gendy, Nagwa M. Abdelazeem, Enass M. El-Sheikh, Mohamed Y. Hanfi, M. Sayyed, Jamelah S. Al-Otaibi, Mohamed F. Cheira
Summary: A new synthetic chelating ligand HTIP was successfully prepared and its specifications were determined using various analytical techniques. The study showed that HTIP has a good retention capacity for U(VI) ions and identified the optimum experimental conditions. Furthermore, thermodynamic and kinetic studies indicated the advantages of HTIP in U(VI) extraction.
Article
Environmental Sciences
H. A. Ibrahium, M. M. Abdel Aal, N. S. Awwad, B. M. Atia, H. E. Ali, M. A. Gado, R. A. Hakami, M. F. Cheira
Summary: In this study, HPIPB/XAD-2 was used as a solid support to investigate the optimum parameters for vanadium(V) adsorption. The chemical structure of HPIPB/XAD-2 was analyzed using various techniques. The batch extraction technique was employed to determine the optimal experimental conditions. The results showed that HPIPB/XAD-2 exhibited high adsorption potential and efficient desorption of vanadium(V).
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Nuclear Science & Technology
Mohamed Y. Hanfi, Ahmed K. Sakr, A. M. Ismail, Bahig M. Atia, Mohammed S. Alqahtani, K. A. Mahmoud
Summary: The physical properties and radiation shielding capabilities of synthetic B2O3-As2O3 glass ceramic were investigated by varying the concentration of As2O3. XRD analysis showed improved crystallinity with the addition of As2O3. The radiation shielding properties, including the linear attenuation coefficient, half-value layer, transmission factor, and radiation protection efficiency, were studied for the B2O3-As2O3 glass ceramic.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Majed A. Bajaber, Ahmed H. Ragab, Ahmed K. K. Sakr, Bahig M. M. Atia, Wael M. M. Fathy, Mohamed A. A. Gado
Summary: A newly synthesized adsorbent (TIHP) was successfully used for the removal of Cr(VI) from water. The adsorption efficiency was highest at pH 2 and ambient temperature.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Saedah R. Al-Mhyawi, D. M. D. Bader, Majed A. Bajaber, Samia M. Abd El Dayem, Ahmed H. Ragab, Khaled A. Abd El-Rahem, Mohamed A. Gado, Bahig M. Atia, Mohamed F. Cheira
Summary: Heavy metal contamination is a global environmental issue with significant public health risks. This study introduces an eco-friendly approach of using a composite material called ZrO2/GO, obtained from synthesized nano zirconium oxide (ZrO2) and graphene oxide (GO) prepared from spent carbon rods, to address water contamination caused by heavy metals.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Environmental
Hassanien Gomaa, Mohamed A. Shenashen, Mohamed F. Cheira, Keisuke Sueki, Tarek A. Seaf El-Nasr, Mahmoud M. Selim, Sherif A. El-Safty
Summary: This study proposes an efficient method for extracting uranium from raw materials by utilizing Three-dimensional mesoporous silica monoliths (MSMs) derived from affordable and sustainable resources like rice husk. The MSMs exhibit high selectivity in extracting 238U isotopes from altered granite rock.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Mohamed Y. Hanfi, Andrian A. Seleznev, Ilia V. Yarmoshenko, Georgy Malinovsky, Elizaveta Yu. Konstantinova, Mohammed S. Alqahtani, Ahmed K. Sakr
Summary: Urban surface deposited sediments (USDS) are indicators of pollution that threaten the environment and human health. In Ekaterinburg, a highly populated metropolitan area in Russia, heavy metal pollution from anthropogenic activities and traffic emissions was detected. The potential ecological and carcinogenic risks were observed, highlighting the need for mitigation measures.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2023)
Article
Biochemistry & Molecular Biology
Rawan E. Elbshary, Ayman A. Gouda, Ragaa El Sheikh, Mohammed S. Alqahtani, Mohamed Y. Hanfi, Bahig M. Atia, Ahmed K. Sakr, Mohamed A. Gado
Summary: A new synthetic material HNAP/QA was prepared and found to have selective adsorption capability for W(VI) ions. The adsorption process was studied in detail and successful recovery of W(IV) from wolframite ore was achieved.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Green & Sustainable Science & Technology
Hassanien Gomaa, Mohamed A. Shenashen, Mohamed F. Cheira, Keisuke Sueki, Tarek A. Seaf El-Nasr, Mahmoud M. Selim, Sherif A. El-Safty
Summary: The expansion of engineering and development of porous materials from agro-waste-derived for the synthesis of bio-adsorbents as efficient extractors is a significant breakthrough in the economy and environment. This study successfully prepared a novel spongy mesoporous hybrid silica (SMS-L) from wheat straw through dissolution/precipitation methodology. The SMS and SMS-L bio-adsorbents were used to extract/preconcentrate 232Th isotope from Egyptian cataclastic rock (ECR), showing high adsorption capacity depending on the pH value of the extraction process. The research provides important insights into the utilization of sustainable waste and the potential for clean energy applications.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Multidisciplinary
Bahig M. Atia, Mohamed F. Cheira, Mohamed A. Hassanin, Hassan S. El-Gendy, Mohamed E. Elawady, Hazem K. A. Sarhan, Hend A. Radwan, Sameh H. Negm, Mohamed A. Gado
Summary: An innovative PVA-EC-GA composite was used to extract boron from a tourmaline ore sample in Egypt. Various analyses were conducted to ensure the proper preparation of the composite. The optimal conditions for the extraction process were determined, and the results showed high boron uptake capacity.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
