Article
Environmental Sciences
J. -k. Kang, B. N. Pham, C. -g. Lee, S. -j. Park
Summary: This study used different macroalgae as biosorbents to remove heavy metals. Costaria costata showed the best biosorbent activity and had various functional groups in its cell wall structure. The modification of Costaria costata was ineffective in improving its biosorption capacity. The adsorption of heavy metals onto Costaria costata occurred via covalent bonding, and heavy metal removal was enhanced with increasing initial solution pH. Among competing cations, Al3+ had the greatest inhibitory effect. The dried biomass of Costaria costata could potentially eliminate heavy metals from aqueous solutions due to its high efficiency, easy acquisition, low cost, and easy preparation.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Zhukela Lin, Yiwei Hu, Yijun Yuan, Baowei Hu, Binliang Wang
Summary: Microplastics have the potential to concentrate and transport heavy metals in the aquatic environment, with the sorption behavior of heavy metals onto them being pH and ionic strength dependent. Among the tested materials, polyvinylchloride PVC showed the highest maximum sorption capacity for lead (II) under the experimental conditions.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Environmental Sciences
Harini Methma Perera, Anushka Upamali Rajapaksha, Sudantha Liyanage, Anusha Ekanayake, Rangabhashiyam Selvasembian, Achlesh Daverey, Meththika Vithanage
Summary: A novel Chitosan-modified Mimosa pigra biochar (CMPBC) was found to have higher efficiency in removing hexavalent chromium (Cr(VI)) from aqueous systems compared to pristine biochar. The sorption of Cr(VI) was heavily dependent on pH, with the highest adsorption occurring at pH 3.0. The results suggest the potential use of CMPBC as an easily available, environmentally sustainable, and inexpensive sorbent for the decontamination of Cr(VI) from water.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Physical
Zhi-lei Zeng, Chuang Yu, Rao -ping Liao, Xiaoqing Cai, Zhi-hao Chen, Zhaokai Yu, Ze-xiang Wu
Summary: This study developed a carboxylate polymer grafted montmorillonite to improve the adsorption capacity of heavy metals. The structural changes of montmorillonite before and after modification were characterized. The results showed that the modified method significantly enhanced the adsorption performance of montmorillonite for cadmium ions.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Biochemistry & Molecular Biology
Peng Zhang, Li Yuan, Jinyu Zeng, Kui Zou, Bingzhi Liu, Taiping Qing, Bo Feng
Summary: This study isolated 7 Pseudomonas strains and evaluated their alginate production under different environmental conditions. Alginate-biomass hydrogel beads were prepared using these strains and their adsorption performance and mechanism to Pb2+ and Cd2+ were analyzed. The results showed that certain strains had high alginate yield and biomass adsorption capacity, which is significant for alginate recovery from activated sludge and heavy metal wastewater treatment.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Biotechnology & Applied Microbiology
Mi-Ra Park, Gwi-Taek Jeong
Summary: This study investigated the production of reducing sugar from Gracilaria verrucosa through physiochemical pretreatment and subsequent enzymatic hydrolysis, achieving a higher yield of reducing sugar with reduced formation of fermentation inhibiting compounds compared to hydrothermal pretreatment. The physiochemical pretreatment method, incorporating ultrasonication and an acid catalyst, shows promise in converting macroalgae to sugars.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Biochemistry & Molecular Biology
Xinan Xu, Lixia Zhang, Ye Han, Zhijiang Zhou
Summary: This study investigated the adsorption capacity of immobilized and free EPS on Pb2+ and Zn2+, with immobilized EPS showing better performance. Thermodynamic studies and adsorption isotherm models confirmed that the adsorption process was mainly chemisorption, involving complexation reactions and ion exchange.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Review
Environmental Sciences
Asmaa Benettayeb, Muhammad Usman, Coffee Calvin Tinashe, Traore Adam, Boumediene Haddou
Summary: This review paper discusses the application of Moringa oleifera as a biosorbent for water purification and the methods to improve its adsorption. Different parts of this plant have been found to have good adsorption capacity and treatment efficiency. The review summarizes important research findings and presents future suggestions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Food Science & Technology
Wen Li, Yinyuan Chen, Tao Wang
Summary: Lactic acid bacteria strain Weissella viridescens ZY-6 showed potential in removing Cd2+ from aqueous solutions, with its binding capacity influenced by various factors. Cd2+ was found to mainly adsorb on the bacterial cell walls, and ZY-6 treatment effectively removed Cd2+ from vegetable and fruit juices.
Article
Metallurgy & Metallurgical Engineering
T. E. Nikiforova, V. A. Kozlov, E. N. Karaseva
Summary: The effect of chemical modification on the sorption properties of cellulose for Cu(II) ions was studied, showing that the modified sorbent had a 2.7 times higher sorption capacity compared to native cellulose due to the presence of new sorption centers. Analysis included the utilization of kinetic models, with results most accurately described by the pseudosecond order model, and isotherms well described by the Langmuir equation. The surface structure changes and appearance of carboxyl groups in cellulose during modification were confirmed by scanning electron microscopy and IR spectra.
PROTECTION OF METALS AND PHYSICAL CHEMISTRY OF SURFACES
(2021)
Article
Chemistry, Physical
Young-Kyu Hong, Jin-Wook Kim, Hyuck-Soo Kim, Sang-Phil Lee, Jae-E Yang, Sung-Chul Kim
Summary: Heavy metal pollution in the environment is a critical issue that affects ecosystem and human health significantly. The study focused on evaluating heavy metal adsorbents using modified industrial byproducts. The results showed that sintered bottom ash had high sorption efficiency for Cd and Pb, with chemical precipitation being the dominant sorption mechanism. Further research is needed to improve the sorption capacity and longevity of these materials.
Article
Environmental Sciences
Melvin S. Samuel, E. Selvarajan, Ramalingam Chidambaram, Himanshu Patel, Kathirvel Brindhadevi
Summary: Chromium, a valuable but toxic ecological pollutant, needs to be reduced in marine systems to lower toxicity levels. Various adsorbents have been found effective in decreasing chromium concentrations, addressing the issue of chromium contamination.
Article
Chemistry, Physical
Justyna Bak, Peter Thomas, Dorota Kolodynska
Summary: In this study, chitosan-modified biochars were synthesized and applied for the efficient adsorption of Cu(II), Cd(II), Zn(II), Co(II), and Pb(II) ions from aqueous media. The materials exhibited a heterogeneous, well-developed surface and demonstrated good thermal stability. The sorption mechanism was determined by the presence of carboxyl, hydroxyl, and phenol functional groups. The optimal sorption conditions were determined by varying the sorbent dose, pH, contact time, initial concentration, and temperature. The sorbents could be regenerated with nitric acid, achieving a high yield. This study provides a cost-effective and high-performance method for water decontamination.
Article
Green & Sustainable Science & Technology
Chen Zhang, Xinqi Zhang, Tingyu Su, Yiheng Zhang, Liwei Wang, Xuancan Zhu
Summary: This review comprehensively assesses five different modification schemes, including acid/alkali/salt treatment, inert supports, functional groups, nanomaterials, and multi-phase sorbents, to provide insights into the mechanisms, performances, and commercial analysis for trace CO2 capture. The features of different schemes are compared and tabulated to guide sorption performance enhancement. Commercial assessments for TCC materials are conducted using a multivariable model, and future development of sorption performance enhancement schemes for low-concentration capture of CO2 is proposed.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Engineering, Environmental
Hala M. Hamadeen, Elsayed A. Elkhatib, Mohamed E. Badawy, Samir A. M. Abdelgaleil
Summary: The study developed a novel nanoscale Moringa olivera seeds waste (nMSW) as an effective bio-nanosrbent for enhanced removal of chlorpyrifos from contaminated wastewater. The nMSW exhibited superior adsorption capacity compared to conventional bulk MSW and most reported green sorbents, with remarkable removal efficiency achieved in a short contact time period. The thermodynamic parameters and bio-sorption data suggested the main driving forces in CPF removal mechanism by nMSW.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
A. Baran Sozmen, Ayca Ata, Bikem Ovez
Summary: This study investigated the growth of Chlorella miniata under different temperature and light intensity conditions. Mathematical models were tested using experimental data, and the Aiba model for light intensity and Skewed Normal Distribution model for temperature performed the best. A new model was developed to consider the combined effects of light intensity and temperature on algal growth. The calculated optimum conditions for maximum specific growth rate were 22.43°C and 291.5 μmol photon m(-2) s(-1) for temperature and light intensity, respectively.
BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Ozcan D. Ova, A. Ata, B. Ovez
Summary: This study provides information about a promising source of unique bioactive compounds derived from the diatom Phaeodactylum tricornutum and the favorable growth conditions for different applications. The study compares the photosynthetic pigment composition of P. tricornutum with a well-known green microalgae C. miniata. The results show that P. tricornutum has a higher chlorophyll-a content, while C. miniata has a higher ss-carotene content. The study also indicates that the accumulation of chlorophyll-a and ss-carotene increases with higher temperature and decreased light intensity, while zeaxanthin content is maximized at the highest light intensity and limited at higher temperature values.
RESEARCH JOURNAL OF BIOTECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Sung-Yeoul Kim, Vikash Chandra Roy, Jin-Seok Park, Byung-Soo Chun
Summary: This study aims to extract functional substances from Undaria pinnatiida sporophyll using supercritical carbon dioxide (SC-CO2) and subcritical water extraction (SWE). The results showed that the consecutive green extraction method can yield extracts rich in fucoxanthin and beta-carotene, and the sporophyll of Undaria pinnatiida contains health-beneficial fatty acids. Additionally, SWE can extract substances with antioxidant, antibacterial, and antihypertensive activities.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2024)