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https://www.readbyqxmd.com/read/30340678/uranium-speciation-in-coal-bottom-ash-investigated-via-x-ray-absorption-fine-structure-and-x-ray-photoelectron-spectra
#1
Yinglong Sun, Menxin Wu, Lirong Zheng, Bangda Wang, Yi Wang
Similar to chromium contamination, the environmental contamination caused by uranium in radioactive coal bottom ash (CBA) is primarily dependent on the chemical speciation of uranium. However, the relationship between uranium speciation and environmental contamination has not been adequately studied. To determine the relationship between uranium speciation and environmental contamination, X-ray absorption fine structure (XAFS) and X-ray photoelectron spectra (XPS) analyses were performed to determine the uranium speciation in CBA exposed to different chemical environments and simulated natural environments...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340309/landfill-leachate-treatment-by-sorption-in-magnetic-particles-preliminary-study
#2
Paulo A Augusto, Teresa Castelo-Grande, Leticia Merchan, Angel M Estevez, Xavier Quintero, Domingos Barbosa
Leachates are still an open issue in environmental protection. Many of the applied methods for their treatment present low efficiency and thus need to be used collectively. In practice reverse osmosis is mostly used, as it is the most effective option, regardless of its cost. Magnetic methods to treat effluents have been used for water and wastewater treatment by the use of magnetic particles together with magnetic separation for the removal of contaminants. However, large-scale applications are few or even non-existent when we deal with complex contaminated media such as landfill leachates, for which not even research studies at laboratorial scale with real samples have been done yet...
January 15, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30340296/stability-and-stabilizing-efficiency-of-mg-fe-layered-double-hydroxides-and-mixed-oxides-in-aqueous-solutions-and-soils-with-elevated-as-v-pb-ii-and-zn-ii-contents
#3
Barbora Hudcová, Martina Vítková, Petr Ouředníček, Michael Komárek
Although the mechanisms of metal(loid) removal from aqueous solutions using LDHs (layered double hydroxides) and mixed oxides (thermally treated LDHs; CLDHs) have been studied, research dealing with their stability, stabilizing efficiency and remediation potential for contaminated soils remains scarce. We present a complex study investigating the stabilizing efficiency of Mg-Fe LDHs and CLDHs at different conditions, including aqueous solutions and real soils with highly elevated As(V), Pb(II) and Zn(II) concentrations...
January 15, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30340280/defluoridation-investigation-of-yttrium-by-laminated-y-zr-al-tri-metal-nanocomposite-and-analysis-of-the-fluoride-sorption-mechanism
#4
Hualing Jiang, Xueqin Li, Lei Tian, Tao Wang, Qi Wang, Pingping Niu, Pinghua Chen, Xubiao Luo
In this study, a laminated nanocomposite of Y-Zr-Al with significantly high surface area of 256.6 m2 /g was successfully prepared, and was used to investigate the defluoridation performance of sorbent based on Yttrium. The composite showed high fluoride sorption performance, especially at low F- concentration conditions. SEM, BET, Elemental Mapping and XPS were used to characterize physicochemical properties of the composite in detail. Several influence factors including pH, presence of coexisting anions and contacting time were detailly investigated...
January 15, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30340157/accumulated-gibbs-free-energy-as-a-quantitative-measure-of-desorption-hysteresis-associated-with-the-formation-of-metastable-states
#5
Mikhail Borisover
The persistence of metastable states was proposed in the literature as one explanation for sorption-desorption hysteresis (SDH) of organic compounds on soils and sediments. When such metastable states freely exchange sorbate molecules with the surroundings and there is no spontaneous exit of a whole system from that state, it is possible to determine the extra Gibbs free energy (ΔGext ) accumulated in a system due to the persistence of metastable states. A novel contribution of this paper is the characterization of SDH, in which the sorption isotherm (SI) and desorption isotherm (DI) do not close a loop, in terms of free energy needed to create "frozen", metastable states...
October 9, 2018: Chemosphere
https://www.readbyqxmd.com/read/30340155/distribution-and-dispersal-of-metals-in-contaminated-fibrous-sediments-of-industrial-origin
#6
Anna Apler, Ian Snowball, Paul Frogner-Kockum, Sarah Josefsson
Industrial emissions can impact aquatic environments and unregulated discharges from pulp and paper factories have resulted in deposits of cellulose fiber along the Swedish coast. These deposits are contaminated by metals, but due to their unique fibrous character the extent of sorption and dispersal of the metals is unclear. Fibrous sediments were sampled at two sites in the Ångermanälven river estuary, Sweden. The partitioning of metals between the sediment, pore water and bottom water was investigated and the degree of bioavailability was evaluated...
October 4, 2018: Chemosphere
https://www.readbyqxmd.com/read/30339936/marine-microplastics-bound-dioxin-like-chemicals-model-explanation-and-risk-assessment
#7
Qiqing Chen, Haibo Zhang, Annika Allgeier, Qian Zhou, Jacob D Ouellet, Sarah E Crawford, Yongming Luo, Yi Yang, Huahong Shi, Henner Hollert
Microplastics have become one of the most pervasive emerging pollutants in the marine environment because of their wide occurrence and high sorption ability for hydrophobic organic contaminants (HOCs). Among the associated HOCs, dioxin-like chemicals (DLCs) can pose severe health risks; however, information on effects of microplastics bound DLCs is lacking. To fill this knowledge gap, this study integrated chemical analysis and in vitro bioassays to elucidate the potential dioxin-like effects of microplastics bound DLCs...
October 12, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30339932/analytical-and-mathematical-assessment-of-emerging-pollutants-fate-in-a-river-system
#8
Constantinos Noutsopoulos, Elena Koumaki, Vasileios Sarantopoulos, Daniel Mamais
The fate of several emerging pollutants in a Greek river system was assessed through analytical measurements and mathematical modelling. Target compounds selected in this study consist of five endocrine disrupting chemicals and four non-steroidal anti-inflammatory drugs. Two sampling campaigns were implemented to assess target compounds concentrations along the river system during dry period. Furthermore a mathematical model was developed in order to simulate the spatial distribution of target compounds concentration...
October 12, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30339539/utilization-of-pleurotus-eryngii-biosorbent-as-an-environmental-bioremedy-for-the-decontamination-of-trace-cadmium-ii-ions-from-water-system
#9
Farah Amin, Farah Naz Talpur, Aamna Balouch, Muhammad Kashif Samoon, Hassan Imran Afridi, Muhammad Ali Surhio
In many parts of the world, cadmium metal concentration in drinking water is higher than some international guideline values. To reduce its level below the safety limit, a sustainable and environmental friendly approach is crucial. Thereby, present article introduce an efficient, non-pathogenic and a novel fungal biosorbent Pleurotus eryngii for the removal of Cd(II) ions from aqueous system. The efficiency of P. eryngii were improved and optimized by investigating many significant factors such as; pH, biosorbent dose, initial Cd(II) ion concentration, temperature and contact time...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30339538/removal-of-methyl-orange-dye-and-copper-ii-ions-from-aqueous-solution-using-polyaniline-coated-kapok-ceiba-pentandra-fibers
#10
Marvin U Herrera, Cybelle M Futalan, Rontgen Gapusan, Mary Donnabelle L Balela
Hollow tubular structured kapok fibers (Ceiba pentandra) were coated with polyaniline (PANI) molecules using an in situ oxidative polymerization technique. The tubular morphology of the kapok fibers was retained after PANI coating. The Fourier transform infrared (FT-IR) spectrum of the PANI-coated kapok fibers illustrated the vibration modes associated with the presence of PANI molecules. The PANI-treated kapok fibers achieved complete wettability with water molecules (zero water contact angle) from initially being highly hydrophobic (contact angle = 120°)...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30339525/fabrication-of-%C3%AE-cyclodextrin-modified-mesostructured-silica-coated-multi-walled-carbon-nanotubes-composites-and-application-for-paraben-removal
#11
Chuyuan Ding, Jun He, Mengxia Xu, Chengjun Wang
In this work, the novel β-cyclodextrin modified mesostructured silica coated multi-walled carbon nanotubes (MWCNTs) composites were synthesized and applied for the removal of parabens in aqueous solution. The prepared MWCNTs/SiO2 /β-CD composites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. The effects of the amount of adsorbent, pH and elution solvents on the removal efficiency of parabens from water solutions were investigated...
October 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/30339320/a-general-mechanistic-model-for-predicting-the-fate-and-transport-of-phthalates-in-indoor-environments
#12
Yirui Liang, Chenyang Bi, Xinke Wang, Ying Xu
A mechanistic model that considers particle dynamics and their effects on surface emissions and sorptions was developed to predict the fate and transport of phthalates in indoor environments. A controlled case study was conducted in a test house to evaluate the model. The model-predicted evolving concentrations of benzyl butyl phthalate in indoor air and settled dust and on interior surfaces are in good agreement with measurements. Sensitivity analysis was performed to quantify the effects of parameter uncertainties on model predictions...
October 19, 2018: Indoor Air
https://www.readbyqxmd.com/read/30339016/optimizing-h-2-d-2-and-c-2-h-2-sorption-properties-by-tuning-the-pore-apertures-in-metal-organic-frameworks
#13
Feng-Juan Zhao, Yan-Xi Tan, Wenjing Wang, Zhanfeng Ju, Daqiang Yuan
By adjustment of the arm lengths of two triphenylamine-based ligands, two nearly isostructural metal-organic frameworks (MOFs), namely, the reported nanoporous FIR-29 (FIR = Fujian Institute of Research) and the new microporous FJI-Y9 (FJI = Fujian Institute), are obtained, and all exhibit honeycomb lattices of hexagonal channels with Ca-COO chains connected by tris[(4-carboxyl)phenylduryl]amine (H3 TCPA) ligands and 4,4',4''-nitrilotribenzoic acid (H3 NTB) ligands, respectively. Although the Brunauer-Emmett-Teller (BET) surface area (1117 m2 g-1 ) and pore size (8...
October 19, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/30338884/pathways-of-mineral-associated-soil-organic-matter-formation-integrating-the-role-of-plant-carbon-source-chemistry-and-point-of-entry
#14
Noah W Sokol, Jonathan Sanderman, Mark A Bradford
To predict the behavior of the terrestrial carbon cycle, it is critical to understand the source, formation pathway, and chemical composition of soil organic matter (SOM). There is emerging consensus that slow-cycling SOM generally consists of relatively low molecular weight organic carbon substrates that enter the mineral soil as dissolved organic matter and associate with mineral surfaces (referred to as 'mineral-associated OM', or MAOM). However, much debate and contradictory evidence persists around: (1) whether the organic C substrates within the MAOM pool primarily originate from aboveground versus belowground plant sources, and (2) if C substrates directly sorb to mineral surfaces or undergo microbial transformation prior to their incorporation into MAOM...
October 19, 2018: Global Change Biology
https://www.readbyqxmd.com/read/30338734/synthesis-of-functionalized-magnetite-titanium-dioxide-nanocomposite-for-removal-of-acid-fuchsine-dye
#15
Sara Rahnama, Shahab Shariati, Fatan Divsar
In this research, a novel magnetite titanium dioxide nanomesopore functionalized by amine groups (Fe3O4@SiO2@TiO2-NH2) was synthesized and its potential for efficient removal of Acid fuchsine (AF) as an anionic dye from aqueous solutions was investigated. For this aim, the core-shell structure of Fe3O4@SiO2@TiO2 was prepared using Fe3O4 as magnetic core, tetra ethyl orthosilicate as silica and tetra butyl titanate as titanium sources for shell. The synthesized nanomesopores (particle size lower than 44 nm) were characterized by FT-IR, XRD, DRS, SEM and TGA instruments...
October 19, 2018: Combinatorial Chemistry & High Throughput Screening
https://www.readbyqxmd.com/read/30336237/populus-tremula-nerium-oleander-and-pergularia-tomentosa-seed-fibers-as-sources-of-cellulose-and-lignin-for-the-bio-sorption-of-methylene-blue
#16
Nouha Sebeia, Mahjoub Jabli, Adel Ghith, Yassine El Ghoul, Fahad M Alminderej
Cellulose-based substrates could represent potential funds for the sorption of pollutants. Herein, methylene blue was selected for demonstrating the bio-sorption efficiency of Nerium oleander, Pergularia tomentosa and Populus tremula seed fibers. Their cellulose contents were 45%, 43.8% and 60%. Their lignin amounts were 21%, 8.6% and 12%, respectively. Fourier Transform InfraRed suggested that the interaction of these bio-products with methylene blue could occur between hydroxyl and ester groups of cellulose and lignin and the sulfur and nitrogen atoms of the dye...
October 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30336006/polyaniline-nanofiber-electrodes-for-reversible-capture-and-release-of-mercury-ii-from-water
#17
Yoonseob Kim, Zhou Lin, Intak Jeon, Troy Van Voorhis, Timothy M Swager
π-Conjugated polyaniline nanofiber networks are an attractive material platform for reversible and selective capture and release of toxic heavy metal ions from water. The nanofiber geometry facilitates fastsorption kinetics, sulfur functionalization of the backbone for improved adsorption, and electrochemical control of the oxidation (charge) state for reversible triggered sorption/desorption of metal ions. These active materials also function as sensors in that the sorption of mercury ions can be detected by analysis of cyclic voltammograms...
October 18, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/30332661/a-review-on-removal-of-organophosphorus-pesticides-in-constructed-wetland-performance-mechanism-and-influencing-factors
#18
REVIEW
Tao Liu, Shirong Xu, Shaoyong Lu, Pan Qin, Bin Bi, Haodong Ding, Ying Liu, Xiaochun Guo, Xiaohui Liu
The residues of organophosphorus pesticides (OPPs) have been widely detected in rivers, the gulf, and even groundwater and drinking water, which may pose a serious threat to aquatic ecosystems and human health. Compared to other treatments, constructed wetlands (CWs) have been demonstrated to be a cost-effective alternative risk mitigation strategy for non-point-source pesticide pollution. This review summarizes 32 studies related to the remediation of OPPs in 117 CWs during 2001-2017 worldwide. The performances, mechanisms and influencing factors in the studies are comprehensively and critically reviewed in this paper...
October 10, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30328896/influence-of-a-hydrophobic-monomer-on-the-physical-and-mechanical-properties-of-experimental-surface-sealants
#19
Maria Cecília Caldas Giorgi, Amalie Perez Vogt, Carina de Jesus Corneta, Marilia Mattar de Amoêdo Campos Velo, Débora Alves Nunes Leite Lima, Giselle Maria Marchi Baron, Flávio Henrique Baggio Aguiar
This study evaluated the effect of adding the hydrophobic monomer 1,12 dodecanediol dimethacrylate (DDDMA) to experimental sealants with and without thermocycling on degree of conversion (DC), water sorption (WS), water solubility (WSB), color stability (ΔE), and micro-shear bond strength (μSBS). Five experimental and one commercially available sealant (Bisco - BIS) were tested. The experimental sealants were formulated by mixing different percentages of DDDMA monomers and urethane dimethacrylate (UDMA). The photoinitiator system was composed by camphorquinone (CQ) and tertiary amine 4-ethyl benzoate dimetilamiono (EDBA)...
October 11, 2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/30325553/water-vapor-exposure-chamber-for-constant-humidity-and-hydrogen-and-oxygen-stable-isotope-composition
#20
Erik J Oerter, Michael Singleton, Melissa Thaw, M Lee Davisson
RATIONALE: Water vapor exposure experiments have applications for studying water physisorption and chemisorption hydration and hydroxylation reactions on a wide variety of material surfaces. The stable isotopes of hydrogen and oxygen in the water molecule are a useful tracer of water exchange mechanisms and/or rates in such vapor exposure experiments. METHODS: We designed and built a humidity chamber system that uses membrane-mediated liquid-vapor exchange of water followed by mixing with dry air to control the relative humidity of air and its δ2 H and δ18 O isotopic composition...
October 16, 2018: Rapid Communications in Mass Spectrometry: RCM
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