Article
Engineering, Environmental
Laishram Saya, W. Rameshwor Singh, Sunita Hooda
Summary: Given the large amount of harmful pharmaceuticals being released into the water stream, it is crucial to eradicate or reduce these chemicals to a minimum permissible limit. This study reports the fabrication of a magnetic guar gum graphene oxide nano-composite (mGG/GO NC) for the adsorption of ciprofloxacin from wastewater. Various techniques were used to characterize the guar gum and the nanocomposite, and it was found that the adsorption process followed the pseudo second order model and Langmuir isotherm model. The nanocomposite exhibited high adsorption capacity and recyclability, potentially due to a synergistic effect of multiple interactions in the adsorption mechanism.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Endar Hidayat, Tomoyuki Yoshino, Seiichiro Yonemura, Yoshiharu Mitoma, Hiroyuki Harada
Summary: A carbonized zeolite/chitosan (C-ZLCH) composite adsorbent was produced to address Cu(II) and Cr(VI) water pollution. The optimal pH values for Cu(II) and Cr(VI) were determined to be 8.1 and 9.6, respectively. The highest adsorption capacities for Cu(II) and Cr(VI) were found to be 111.35 mg/g at 60 min and 104.75 mg/g at 90 min, respectively, using C-ZLCH as the adsorbent.
Article
Engineering, Environmental
Sara Mola Ali Abasiyan, Azar Nasiri Sour, Amir Mokhtari, Farahnaz Dashbolaghi, Mohammad Sabzi
Summary: In this study, chitosan/sodium alginate/nano cellulose nanocomposite hydrogels were prepared using a green route and used as sorbents to adsorb Cd2+ ions from water and soil systems. The influences of various factors on adsorption and desorption isotherms were investigated, and it was found that CSA-N was more efficient than CSA for cadmium removal. The Langmuir and Freundlich models provided the best fit for the experimental adsorption data for CSA and CSA-N, respectively.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2022)
Article
Biochemistry & Molecular Biology
Thouraya Turki, Abdelkader Hamdouni, Alexandru Enesca
Summary: Fluorine is a common element that is found in various forms and concentrations in the Earth's crust, air, food, and natural waters. Its effects on human health depend on the absorbed concentration, with low levels being beneficial and high levels being toxic. Adsorption using modified zeolites has been proven to be an efficient and cost-effective method for removing fluoride from water. The study investigated the adsorption process and determined influential parameters such as particle size, stirring rate, pH, initial concentration, contact time, and temperature. The findings showed that modified zeolite had a 94% removal efficiency at specific conditions.
Article
Engineering, Environmental
Nooraddein A. Ekrayem, Almahdi A. Alhwaige, Wael Elhrari, Mohamed Amer
Summary: The study developed eco-friendly polymeric spheres derived from crosslinking of chitosan (CTS) with different polyesters. The spheres showed enhanced structure and stability in aqueous media, with decreased hydrophilicity, and were effective in adsorbing lead ions (Pb2+) from aqueous solutions. The experimental data was fitted well with the Freundlich isotherm model, showing the best fit for the adsorption process.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Inorganic & Nuclear
Sarat Kanrar, Abir Ghosh, Ayan Ghosh, Mriganka Sadhukhan, Tanmay Bhowmik, Uday Chand Ghosh, Palani Sasikumar
Summary: Chromium(III)/zirconium(IV) impregnated chitosan-beta-cyclodextrin bio-composite (CB@CZ) was fabricated successfully using a simple chemical method. The material shows selective adsorption of Cu(II) ions and has potential for removing Cu(II) from contaminated waste-water.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Environmental Sciences
Manikandan Rajendran, Selvaraj Barathi, Maryium Sajjad, Gadah Albasher, Jintae Lee
Summary: Arsenic remediation is a serious global issue. Carbon-encapsulated Fe nanoparticle composites (Fe/C CNPs) were synthesized and their adsorption behavior was investigated. The results suggest that Fe/C CNPs can be used for the remediation of arsenic-contaminated water.
ENVIRONMENTAL RESEARCH
(2022)
Article
Multidisciplinary Sciences
Edwin Andrew Ofudje, Ezekiel F. Sodiya, Olajire S. Olanrele, Fatai Akinwunmi
Summary: This study investigated the use of chemically synthesized apatite (CHAp) powder as an adsorbent for removing Cd2+ from water. The effects of time, initial Cd2+ concentration, amount of CHAp, temperature, and solution pH on the adsorption process were studied. Various analytical techniques were used to analyze the synthesized hydroxyapatite (HAp) powder and confirm its adsorption capacity. The results showed that CHAp performed well as an adsorbent for Cd2+ and could be used in bioremediation applications.
Article
Multidisciplinary Sciences
Mehmet Emin Kucuk, Iryna Makarava, Teemu Kinnarinen, Antti Hakkinen
Summary: In this study, NaP and LTA zeolites were successfully synthesized from woody biomass ash using alkali fusion-assisted hydrothermal method. The synthesized zeolites were tested for the adsorption of Cu(II), Cd(II), Pb(II), and Zn(II) ions. The results showed that the maximum adsorbed amount of metals followed the order Pb(II) > Cu(II) > Cd(II) > Zn(II) for both NaP and LTA zeolite. The kinetic data fit well with the pseudo-second order model, indicating chemisorption as the rate-limiting step. The isotherm data were well described by the Sips and Redlich-Peterson models, indicating a non-ideal heterogeneous adsorption process.
Article
Chemistry, Multidisciplinary
Ali Hashem, Chukwunonso Onyeka Aniagor, Mohamed Abdel-Fattah Afifi, Ashraf Abou-Okeil, Sayed Hussein Samaha
Summary: Through grafting and hydrolyzation of native corn starch, chemically crosslinked superabsorbent hydrogels with heavy metal chelation properties were produced, demonstrating fast swelling and high water absorption capacity. Extensive adsorption data modeling confirmed the dominance of the metal complexation mechanism in the adsorption process, validating the potential application of SAHs as biosorbents for heavy metal decontamination.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(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
Chao Hu, Zuhong Zheng, Mengyao Huang, Fan Yang, Xuewei Wu, Aiqun Zhang
Summary: This study analyzed a magnetite-chitosan composite through various techniques and explored its adsorption properties for Cu(II) and Cd(II). The results showed that the optimum pH for adsorption was 5.0, the equilibrium time was about 10 minutes, and the adsorption capacity reached 26.28 mg/g for Cu(II) and 18.67 mg/g for Cd(II). The temperature had a certain impact on the adsorption amount, and the composite material had a relatively rough outer surface, with dominant adsorption being attributed to chitosan. The research suggests the importance of further optimizing the composite system through green synthesis for heavy metal adsorption.
Article
Environmental Sciences
Mahmuda Akter, Noriko Hirase, Md. Tajuddin Sikder, Md. Mostafizur Rahman, Toshiyoki Hosokawa, Takeshi Saito, Masaaki Kurasaki
Summary: Lead (Pb) is a highly toxic heavy metal that can enter the biological system through the food chain, and lead ion (Pb (II)) can be released into the environment from natural and anthropogenic sources. Among various remediation techniques, adsorption is considered effective for its economic and versatile properties. The study showed that the CS-AC-PVA composite beads have better adsorption capacity for Pb (II) compared to lone CS, AC, and CS-AC beads, with a 44% increase compared to CA-AC beads. The adsorption capacity of CS-AC-PVA beads for Pb (II) was highest at 25 degrees C, following the Freundlich isotherm model with increasing concentrations and decreasing temperatures. This demonstrates the potential of CS-AC-PVA composite beads as an adsorbent for environmental remediation of Pb (II) from aqueous solutions.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Chemistry, Multidisciplinary
Rahmi, Muhammad Iqhrammullah, Ulfa Audina, Husni Husin, Haya Fathana
Summary: A film adsorbent OC/Chi-EDTA was prepared from OPEFB-based charcoal through a simple phase inversion technique, showing advantageous properties for Cd (II) adsorptive removal. The material exhibited high tensile strength, adsorption capacity, and thermal stability, with successful adsorption mechanisms of electrostatic attraction and complexation for Cd (II) uptake.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2021)
Article
Engineering, Chemical
Mohamed E. Mahmoud, Gehan M. Nabil, Shimaa M. T. Elweshahy
Summary: This study demonstrates a microwave-assisted method for synthesizing a novel crosslinked nanocomposite from TiO2NP-chitosan and ZrO2NP-chitosan for the removal of trivalent gadolinium and samarium ions from water. The synthesized nanocomposite exhibits good sorption properties controlled by various factors, with maximum uptake capacities achieved at pH 7. Models used to describe the adsorption processes agree with pseudo-first order and Langmuir-Freundlich isotherms.
