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Marko Chigondo, Hugues Kamdem Paumo, Madhumita Bhaumik, Kriveshini Pillay, Arjun Maity
Hydrous CeO2 -Fe3 O4 (HCeFe) decorated polyaniline nanofibers (HCeFe NFs) were obtained through a simple co-precipitation deposition approach on pre-synthesized polyaniline nano-fibers (PANI NFs), and evaluated as adsorbents for fluoride removal from synthetic and real water samples. Field emission scanning electron microscopy/energy dispersive X-ray spectroscopy (FE-SEM/EDS), high resolution-transmission electron microscopy (HR-TEM), Braunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric-differential thermal analysis (TGA-DTA), X-ray photoelectron spectroscopy (XPS) and dynamic mechanical analysis (DMA) techniques were used to characterize the hybrid nanomaterials...
July 31, 2018: Journal of Colloid and Interface Science
P Barragán-Peña, M G Macedo-Miranda, M T Olguín
Two kinds of clinoptilolite-rich tuffs from the state of Sonora (Mexico), previously treated with NaCl solution and then modified with thiourea, were investigated to remove Cd2+ from aqueous solution in a fixed-bed column system. Experiments were conducted with a 30 mg L-1 Cd2+ solution at a pH value of 5 and three-bed heights of sodium- and thiourea-modified clinoptilolite-rich tuffs. The experimental data were examined with the Bed Depth Service Time model (BDST), the Thomas model, and a mass balance approach...
August 13, 2018: Environmental Technology
Nimra Ilyas, Sadia Ilyas, Sajjad Ur Sajjad-Ur-Rahman, Sidra Yousaf, Aqsa Zia, Sidra Sattar
In the present study, biosorption behavior of a green filamentous alga, spirogyra in its native and modified states was investigated for copper removal from an electroplating industrial effluent. For this, the effluent containing 194 mg·L-1 Cu2+ in sulfate medium was contacted with both forms of spirogyra, under the parametric variations of effluent pH, adsorbent dosage, contact time, and sorption temperature. The study revealed spirogyra as a prominent candidate for removing contaminant metal cation; however, at the same condition, biosorption capacity of modified biomass in gel form was higher than the native spirogyra...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Gargi Biswas, Philips Prince Pokkatt, Aratrika Ghosh, Biswajit Kamila, Kalyan Adhikari, Susmita Dutta
Fluoride contamination in groundwater is now becoming a global concern. In the present study, removal of fluoride using dry biomass (DBM) of a micro-algal consortium of Chlorococcum infusionum and Leptolyngbya foveolaurum, collected from a coke-oven effluent treatment plant, Durgapur, India, has been investigated. The large volume of algal bloom in the industrial effluent has created serious disposal issues and caused severe environmental concerns. A biosorption technique has been carried out to valorize the waste algae biomass into a potential adsorbent...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Fei Gao, Liwen Xiao, Hongzhou Zhang
The studies described in the Research Communication aimed to describe the feasibility of using coal fly ash to synthesize nano-zeolite, and the ammonium and phosphate adsorption efficiencies of the nanomaterial in dairy wastewater. Chemical treatment of coal fly ash was conducted and changes observed. Samples treated with NaOH had an increased cation exchange capacity and P sorption index compared to the initial fly ash, due to particle modification from smooth surface to plate- and rod-shape crystals, referred to as nano-zeolite...
August 13, 2018: Journal of Dairy Research
Lin Xu, Shihe Xu, Qiaoli Zhang, Qiang Xu, Shengxiao Zhang, Yaqi Cai
Cis-/trans-2,4,6-triphenyl-2,4,6-trimethylcyclotrisiloxanes (cis-P3 and trans-P3) and cis-/trans-2,4,6,8-tetraphenyl-2,4,6,8-tetramethylcyclotetrasiloxanes (cis-P4 and trans-P4a,b,c) were detected in personal care products [<LOD-54.2 µg/g, detection frequencies (df) =14.5-15.5%, n=110] collected from a Chinese city, suggesting their potential release to local municipal wastewater treatment plant (WWTP). In the local WWTP, per capita mass loadings of P3 and P4 were 43.4-340 µg/d in influents, while neither P3 nor P4 were detected in effluents...
August 13, 2018: Environmental Science & Technology
Hong Chen, Youn Jeong Choi, Linda S Lee
Global phase out of perfluorooctane sulfonic acid (PFOS) has led to increasing production of alternatives such as the chlorinated polyfluoroalkyl ether sulfonic acids (Cl-PFESAs) for which little is known on their environmental fate. In this study, sorption by soils, aerobic soil biodegradation, and oxidation potential of 6:2 Cl-PFESA (9-chlorohexadecafluoro-3-oxanonane-1-sulfonate) and 8:2 Cl-PFESA (9-chlorooctadecafluoro-3-oxanonane-1-sulfonate) were evaluated. 6:2 Cl-PFESA sorption was quantified for aqueous and acetone/water solutions whereas 8:2 PFESA was could only be accurately measured in acetone/water solutions...
August 12, 2018: Environmental Science & Technology
Xueyong Zhou, Hang Li, Daying Liu, Jianchao Hao, Huifen Liu, Xianzhi Lu
Bt crops have been widely commercialized for cultivation in the world, but as yet, the effects of Bt toxin on sorption of heavy metals in soils has not been reported. In this study, the effects of toxin from Bacillus thuringiensis on Pb (II) sorption by red (Ultisol) and black soil (Vertisol) were studied using the batch method. The results showed that Pb(II) sorption by both soil types decreased in the presence of Bt toxin from 0 to 10 mg/L, which was probably due to the sorptive sites competition and Pb-toxin complex formation...
August 2, 2018: Journal of Hazardous Materials
Robin Guibal, Sophie Lissalde, Yoann Brizard, Gilles Guibaud
Pharmaceutical monitoring (37 pharmaceuticals and 3 human tracers) was conducted in a headwater streams in southwest France, an area characterized by a low population density with an elderly population (30% > 60 years old) and extensive agriculture (cow cattle breeding). Polar Organic Chemical Integrative Sampler (POCIS) were exposed for 14-day consecutive periods in 2016 at three sampling points. Three human wastewater tracers and 20 pharmaceuticals commonly used for human and/or cattle were quantified in headwaters...
July 31, 2018: Journal of Hazardous Materials
Po-Hsin Su, Dave Ta Fu Kuo, Yang-Hsin Shih, Chih-Yu Chen
Substantial variability in sorption capacity of black carbon (BC) has been a major challenge for accurate fate and risk assessment of organic pollutants in soils and sediments. 16 model organic sorbates (logKOW  = 0.38-4.21) encompassing diverse chemical functionalities were used to probe the sorption capacity of two diesel soot samples representative of graphitic BC (BC1, specific surface area (SSA) = 87 m2 /g) and amorphous, oxygenated BC (BC2; SSA = 3.6 m2 /g). The BC-water sorption coefficients (logKBC ) of the model sorbates were determined using reversed-phase liquid chromatography (RP-LC) on soot-filled columns...
July 27, 2018: Water Research
Qiuci Miao, Erping Bi
Effects of alkyl chain length of ionic liquid (IL), soil components and solution inorganic cations on a selected IL (1-methyl-3-octylimidazolium chloride, [OMIM]Cl) interaction with Chinese soils were investigated using batch sorption experiments. The results indicated that sorption energy was mainly controlled by chain length of [OMIM]Cl and contents of soil organic matter (SOM). [OMIM]Cl sorption on soils was mainly controlled by cation exchange process. Contributions of SOM and clay minerals (CMs) to [OMIM]Cl sorption were 7...
October 1, 2018: Journal of Environmental Management
Fanqi Jing, Saran P Sohi, Yuyan Liu, Jiawei Chen
Biomass derived biochar is a stable carbon-rich product with potential for soil amendment. Introduced into the natural environment, biochar will naturally experience 'ageing' processes that are liable to change its physicochemical properties and the mobility of sorbed pollutants over the longer term. To elucidate the reciprocal effects of biochar ageing and heavy metal adsorption on the affinity of biochar for organic pollutants, we systematically assessed the adsorption of diethyl phthalate (DEP), representative of phthalic acid esters (PAEs), to fresh and aged biochars with and without coexistence of Cd2+ ...
August 1, 2018: Environmental Pollution
P Ciffroy, M Benedetti
The main objectives of this study were to evaluate global uncertainty in the prediction of Distribution coefficients (Kds) for several Trace Metals (TM) (Cd, Cu, Pb, Zn) through the probabilistic use of a geochemical speciation model, and to conduct sensitivity analysis in speciation modeling in order to identify the main sources of uncertainty in Kd prediction. As a case study, data from the Loire river (France) were considered. The geochemical speciation model takes into account complexation of TM with inorganic ligands, sorption of TM with hydrous ferric oxides, complexation of TM with dissolved and particulate organic matter (i...
August 2, 2018: Environmental Pollution
Shuo Lin, Yufeng Zhao, Yeoung-Sang Yun
Nonsteroidal anti-inflammatory pharmaceuticals are emerging organic micropollutants in surface water, groundwater, and wastewater, whose removal is very important yet challenging. As a new class of porous functional materials, metal-organic frameworks (MOFs) have attracted extensive attention for their adsorption applications. Here, we report that Zr(IV)-based MOFs (defective UiO-66, and MOF-808) have extraordinary adsorption ability to remove nonsteroidal anti-inflammatory pharmaceuticals from water. Excellent adsorption performances are obtained for UiO-66 and MOF-808, particularly for UiO-66, of which the adsorption capacities are the highest in a wide series of adsorptive materials previously reported...
August 10, 2018: ACS Applied Materials & Interfaces
Majid Daneshvar, Mohammad Raouf Hosseini
Sorption is the most effective approach to the treatment of acid mine drainage (AMD) and wastewaters, but the removal of the adsorbents from water has always been a challenging problem which may be resolved by using magnetic separation. In this work, a magnetic bioadsorbent was prepared using low cost and high-performance sources and applied in Cr(VI) removal from a synthetic solution. Initially, magnetite nanoparticles were synthesized from iron boring scraps by chemical co-precipitation method. Results of dynamic light scattering (DLS) and vibrating sample magnetometry (VSM) analyses showed that the synthesized nanoparticles were around 40 nm in size and had a significant magnetization...
August 9, 2018: Environmental Science and Pollution Research International
Nasim Baimani, Parviz Aberoomand Azar, Syed Waqif Husain, Homayon Ahmad Panahi, Ali Mehramizi
This study introduced a developed approach for dendritic β-cyclodextrin (β-CD) in order to obtain high sorption capacity. Synthetic strategy exploits the reactivity between acrylic acid and allyl glycidyl ether for high-yielding assembly via grafting on to the magnetic nanoparticles that are modified using 3-mercaptopropyltrimethoxysilane for various building branches and host-guest molecules of β-CD. The methodology has been applied for the preparation of a series of β-CD conjugated magnetic nanoparticles with dendrimers as a nano-sorbent for the extraction of methylprednisolone acetate...
August 2, 2018: Journal of Chromatography. A
Jairton Dupont, Nathalia Simon, Marcileia Zanatta, Jessé Neumann, Anne-Lise Girard, Graciane Marin, Hubert Stassen
A series of functionalized N-alkylimidazolium based ionic liquids (ImILs) were designed, through anion (carboxylates and halogenated) and cation (N-alkyl side chains) structural modifications, and studied as potential sorbents for CO2. The sorption capacities of as prepared bare ImILs could be enhanced from 0.20 to 0.60 molar fraction (mol CO2 per mol of sorbent) by variation of cation-anion-CO2 and IL-CO2-water interaction. By combining NMR spectroscopy with molecular dynamics simulations, a good description of interactions between ImIL and CO2 can be obtained...
August 9, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Collen Z Leng, Mark D Losego
Vapor phase infiltration (VPI) is a new approach for transforming polymers into organic-inorganic hybrid materials with unique properties. Here, we combine experimental measurements with phenomenological theory to develop a universal strategy for measuring, modeling, and predicting the processing kinetics of VPI. We apply our approach to the well-studied VPI system of trimethylaluminum (TMA) infiltrating poly(methyl methacrylate) (PMMA) because the system undergoes both precursor-polymer diffusion and reaction...
August 9, 2018: Physical Chemistry Chemical Physics: PCCP
Junho Han, Hee-Myong Ro
Arsenate and phosphate have similar properties due to their electrochemical structures, but their environmental impacts are unique. The abundance and competition of arsenate and phosphate determine their bioavailability and leachability; thus, it is essential to understand their fate in the soil environment. In this study, the effects of pH and surface loading on the competitive adsorption of arsenate and phosphate on four iron (hydr)oxides were evaluated by employing the Langmuir isotherm, competitive sorption ratio (CSR), and competition effect (CE)...
August 8, 2018: Environmental Science and Pollution Research International
Qianqian Dong, Feng Wang, Yihua Xiao, Penghui Li, Qinghui Huang
Eutrophication enhances the production of autochthonous dissolved organic matter (DOM), which is a major driving factor behind the impairment of many aquatic ecosystems. In a mesocosm study, we investigated the effects of the abundance and composition of DOM on the potential bioavailability of cadmium (Cd) caused by eutrophication, using three-dimensional excitation-emission matrix fluorescence spectroscopy integrated with tangential flow ultrafiltration technology. The complexing capacity of DOM-Cd and the sorption distribution coefficient between DOM and the bulk solution was calculated based on a 1 : 1 complexation model...
August 9, 2018: Environmental Science. Processes & Impacts
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