Article
Environmental Sciences
Xinxin Chen, Siheng Cai, Nan Zhang, Jieqiu Yang, Tangjian Peng, Fei Yang
Summary: Heavy metal pollution poses a serious threat to the environment and human health. Biosorption, a cost-effective and environmentally friendly method, has gained worldwide attention. This study investigates the biosorption of U(VI) onto live and dead cells of a Sphingopyxis strain YF1. The results show that both live and dead cells have good adsorption performance, with the maximal adsorption capacities of U(VI) being 140.7 mg g(-1) and 205.7 mg g(-1), respectively. The mechanisms of U(VI) adsorption by Sphingopyxis sp. YF1 were also revealed.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Xuan Han, Yong Zhang, Chunmiao Zheng, Xiangnan Yu, Shiyin Li, Wei Wei
Summary: In this study, a novel nanocrystalline chlorapatite (CIAP) was successfully prepared using eggshell wastes as a calcium source by a green method. The CIAP showed excellent stability and adsorption performance for Cr(VI), and demonstrated potential for multiple reuses. This material has the capability to be a promising candidate for enhancing oxyanion contaminants such as Cr(VI) removal from water.
Article
Engineering, Environmental
Catarina Helena Pimentel, Lidia Diaz-Fernandez, Diego Gomez-Diaz, Maria Sonia Freire, Julia Gonzalez-Alvares
Summary: Reducing the harmful impacts of CO2 emissions and greenhouse effect on climatic conditions is necessary. In this study, biochar and activated carbons were produced and characterized. The activated carbon activated at 600 degrees C with KOH at a ratio of 1:4 w/w showed the highest CO2 adsorption capacity and selectivity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Jeremie Huynh, Ruben Palacio, Audrey Allavena, Herve Gallard, Michael Descostes, Anne-Sophie Mamede, Sebastien Royer, Emmanuel Tertre, Isabelle Batonneau-Gener
Summary: The study investigated the adsorption of U(VI) from natural mine water using sorbents modified by NH2 organic moieties in packed columns, finding that amine-functionalized SBA-15 was effective for U(VI) removal. Results showed that mesostructuration did not play a significant role in adsorption capacity, and the density of amine functional groups was crucial. Additionally, competitor ions such as Ca2+ and HCO3- were found to have a negative impact on U(VI) species adsorption on amino modified silica.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Preeti Tewatia, Manpreet Kaur, Sonal Singhal, Anupama Kaushik
Summary: Functional ecofriendly fluorescent probe and bioadsorbents were fabricated from wheat straw to detect and alleviate hazardous uranyl ions from wastewater, showing potential application for probing and removal of uranyl ions with high efficiency.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
Khaled Al-Zawahreh, Maria Teresa Barral, Yahya Al-Degs, Remigio Paradelo
Summary: Compost from pine bark has shown effective adsorption for different classes of textile dyes. The adsorption capacity was higher for Basic Violet 10 (BV10) than for Direct Blue 151 (DB151) in batch conditions, and competition reduced the uptake of both dyes. Furthermore, the presence of both dyes in solution decreased their affinities in column tests. The column biosorbent could be effectively regenerated using ethanol.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Engineering, Environmental
Pummarin Khamdahsag, Dickson Y. S. Yan, Pongnapa Poompang, Nichapa Supannafai, Visanu Tanboonchuy
Summary: Arsenite was effectively removed via oxidation and adsorption in fixed-bed columns using K-OMS2 and Fe-BTC. K-OMS2 showed high efficiency in oxidizing As(III) to As(V) with leached Mn and K concentrations below the groundwater standard. Fe-BTC exhibited good adsorption capacity for As(V) with low Fe leaching and more than 75% removal efficiency. In the combined use of the two columns, over 62% of total As was removed under optimal conditions.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Water Resources
Jyoti Singh, Santhosh Kumar Kumaresan, Sarvanshi Swaroop, Vishal Mishra
Summary: The present study aims to develop a mathematical model that relates reactor parameters with the breakthrough curve in fixed-bed column adsorption. The effects of operating parameters such as bed height, flow rate, and initial adsorbate concentration on adsorption were investigated using various breakthrough curves. The arbitrary constants of the developed model were found to depend on the operating parameters of the breakthrough kinetics. The proposed model showed excellent results for the referenced data, with a breakthrough curve R-2 greater than 0.98. The model's flexibility allows for easier optimization of the reactor parameters and reduction in the number of complicated experiments needed.
APPLIED WATER SCIENCE
(2023)
Article
Agricultural Engineering
Uplabdhi Tyagi
Summary: The study highlights the potential of Vetiveria Zizanioides derived biochar for heavy metal removal in multicomponent systems. Biochar efficiency varies with pH, metal ion concentration and residence time. Fixed-bed column testing showed that multicomponent sequence provides more protection against premature exhaustion of biochar.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Vijoyeta Chakraborty, Papita Das, Pankaj Kumar Roy
Summary: In this study, a nanocoated adsorbent was produced using sawdust to effectively remove cadmium from solution. The nanocomposite showed higher removal capacity compared to normal sawdust-based composites, making it a viable alternative for pollutant treatment. This method offers sustainability and low cost benefits.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Chemistry, Multidisciplinary
Candelaria Tejada-Tovar, Angel Villabona-Ortiz, Rodrigo Ortega-Toro
Summary: This study demonstrated that bio adsorbents prepared from yam starch and plantain waste can effectively remove Cr (VI) and Ni (II) from aqueous solutions, with removal efficiencies above 80%. Temperature was found to have the most significant influence on Cr (VI) removal, while adsorbent dose and temperature were relevant factors for Ni (II) removal.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Jolanta Karolina Warchol, Paulina Sobolewska, Wlodzimierz Tylus, Roman Petrus
Summary: Natural clinoptilolite tuff and chabazite-clinoptilolite tuff were modified with hexadecyltrimethylammonium bromide (HDTMA-Br) in fixed-bed column for Cr(VI) sorption. The efficiency of Cr(VI) uptake by prepared surface modified zeolites (SMZs) increased with increasing of HDTMA loading. Ion exchange is the predominant mechanism of Cr(VI) sorption, with XPS analysis revealing reduction to less-toxic Cr(III) by N-containing groups and Fe+2 ions on the zeolite external surface.
Article
Chemistry, Physical
Yonghong Niu, Yuyang Hu, Wencai Wang
Summary: In this paper, the synergistic effect of co-gasification for coal gangue and pine sawdust was studied, and it was found that there was a synergistic effect between the two. Under certain conditions, the co-gasification synergistic effect yielded the best results, with the highest hydrogen volume fraction and alkali metal content.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Chemistry, Applied
Anny Leudjo Taka, Michael J. Klink, Xavier Yangkou Mbianda, Eliazer Bobby Naidoo
Summary: The inadequate access to clean water worldwide, especially in Southern Africa, is largely due to pollution by a variety of contaminants. Traditional water treatment methods are facing challenges from new emerging pollutants, necessitating the development of simpler and more cost-effective purification methods using natural polymers like chitosan modified with nanomaterials. Research on functional chitosan-based nanomaterials proves their effectiveness in eliminating environmental pollutants from wastewater.
CARBOHYDRATE POLYMERS
(2021)
Article
Engineering, Environmental
Tobias Reinhardt, Eduard Rott, Philip A. Schneider, Ralf Minke, Harald Schoenberger
Summary: This study found that the introduction of an acidic regeneration step can improve the adsorption performance on GFH when treating real membrane concentrate, achieving 95% adsorption efficiency. However, in alkaline regeneration, desorption performance significantly decreases when the electrical conductivity of NaOH drops below 90 mS/cm. Regularly replacing NaOH can significantly improve desorption performance.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
