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Balasubramani Ravindran, Dinh Duc Nguyen, Dhiraj Kumar Chaudhary, Soon Woong Chang, Jaisoo Kim, Sang Ryong Lee, JoungDu Shin, Byong-Hun Jeon, SeokJoo Chung, JaeJoung Lee
Excessive nutrients and toxic gas emissions from animal manure management are of great global concern, with negative environmental and economic consequences worldwide. Due to biochar recalcitrance and sorption properties, this study investigated the effect of the biochar(BC) derived from bamboo, amendment on swine manure(SM) composting efficiency through physical, physio-chemical, gaseous emissions, microbiological, and phytotoxic analysis during the 56 day process of in-vessel composting. The treatments were set-up from different ratios of biochar to swine manure mixed with sawdust(SD)(i...
December 2, 2018: Journal of Environmental Management
Marcos R F DA Silva, Maria Eliana L R DE Queiroz, Antônio A Neves, Antônio A DA Silva, André F DE Oliveira, Renan L DE Oliveira, Mariane M Azevedo
Biochar is a carbonaceous material that has excellent potential as a fertilizer and soil conditioner. However, there is a lack of information concerning the effects of the amount and particle size of this pyrogenic material on the soil sorption capacity. In this work, evaluation was made of changes in clomazone (CMZ) sorption in a Red Latosol following soil conditioning using different percentages (0.25, 0.5, and 1% w/w) of sugarcane biochar in three particle sizes (<106, 106-508, and 508-610 µm). The conditioned soils presented apparent sorption coefficients (Kd) up to 1300 times higher than that of pure soil, besides changes in the behavior of CMZ sorption...
October 2018: Anais da Academia Brasileira de Ciências
Zhixuan Wang, Junaid Saleem, John P Barford, Gordon McKay
Cellulose is widely used as an effective sorbent to treat wastewater. Cellulosic sorbents have the advantage of biodegradability, as they are natural plant based materials, compared with the synthetic materials such as polypropylene (PP) or polyurethane (PU). Among the raw biomass materials used for cellulose production, rice husk is one of the most cost competitive and widely available. In this work, biological treatments are compared to find the most effective treatment method for cellulose fiber production from rice husk...
December 5, 2018: Environmental Technology
Rivka B Fidel, David A Laird, Kurt A Spokas
Biochars are potentially effective sorbents for NH4 + and NO3 - in water treatment and soil applications. Here we compare NH4 + and NO3 - sorption rates to acid-washed biochars produced from red oak (Quercus rubra) and corn stover (Zea mays) at three pyrolysis temperatures (400, 500 and 600 °C) and a range of solution pHs (3.5-7.5). Additionally, we examined sorption mechanisms by quantification of NH4 + and NO3 - sorption, as well as Ca2+ and Cl- displacement for corn stover biochars. Solution pH curves showed that NH4 + sorption was maximized (0...
December 4, 2018: Scientific Reports
Mária Porubská, Angela Kleinová, Peter Hybler, Jana Braniša
Sorption of higher concentrations of Cu(II) solution onto natural sheep wool or wool irradiated by an electron beam was studied. Sorption isotherms were of unexpected character, showing extremes. The samples with lower absorbed doses adsorbed less than non-irradiated wool, while higher doses led to increased sorption varying with both concentration and dose. FTIR spectra taken from the fibre surface and bulk were different. It was concluded that there was formation of Cu(II)-complexes of carboxylic and cysteic acids with ligands coming from various keratin macromolecules...
December 2, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Yao Huang, Yanyan Gong, Jingchun Tang, Siyu Xia
A novel thiol-functionalized graphene oxide/Fe-Mn (SGO/Fe-Mn) was investigated for aqueous Hg2+ and CH3 Hg+ removal. Mercury were removed mainly through ligand exchange and surface complexation with surface active sites (i.e., -SH, OH, OCO, CC, SiO, and ππ bond). SH had the strongest binding ability with mercury, forming sulfur-containing organic matter or polymers with Hg2+ , and sulfur-containing organometallic compounds or thiolate-like species with CH3 Hg+ . The BET sorption isotherm model well simulated the sorption isotherm data of Hg2+ (R2 =0...
November 18, 2018: Journal of Hazardous Materials
Ling Ou, Travis W Gannon, Consuelo Arellano, Matthew L Polizzotto
Atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) is one of the most widely used herbicides worldwide, and groundwater contamination is of concern, especially in heavily used regions and in edaphic conditions prone to leaching. Soil sorption plays an essential role in atrazine environmental fate, yet consistent atrazine risk prediction remains limited. A quantitative meta-analysis was conducted to characterize the effect of soil properties on atrazine sorption, using 378 previous observations in 48 publications from 1985 to 2015 globally, which included data on soil properties and sorption parameters...
November 2018: Journal of Environmental Quality
Jesus Cantu, Diego F Gonzalez, Yvette Cantu, Tom Eubanks, J G Parsons
In the present study, pyrrhotite (Fe7 S8 ) was investigated for the removal of Pb2+ and Cu2+ ions from aqueous solution. The Fe7 S8 material was prepared through a solvothermal method and was characterized using XRD. The average particle size for the nanomaterial was determined to be 29.86 ± 0.87 nm using XRD analysis and Scherrer's equation. Batch studies were performed to investigate the effects of pH, time, temperature, interfering ions, and the binding capacity of Pb2+ and Cu2+ ions to the Fe7 S8 nanomaterial...
July 2018: Microchemical Journal, Devoted to the Application of Microtechniques in All Branches of Science
Roger Mamitiana Razanajatovo, Jiannan Ding, Shanshan Zhang, Hang Jiang, Hua Zou
The aim of the present study was to evaluate the sorption and desorption of sulfamethoxazole (SMX), propranolol (PRP) and sertraline (SER) by polyethylene (PE) microplastics in water. After the 96 h mixture, the sorption percentages of pharmaceuticals on PE microplastics decreased according to the following order: SER (28.61%) > PRP (21.61%) > SMX (15.31%). The sorption kinetics were fitted well with the pseudo-second-order model. Both linear and Freundlich models were able to describe the sorption isotherm...
November 2018: Marine Pollution Bulletin
Avni Solanki, Treavor H Boyer
This research advances the knowledge of the pharmaceutical removal interactions by biochar in synthetic and real urine through the use of reference adsorbents and adsorbate probes. Earlier work has combined biochar and urine for pharmaceutical removal, however, the interactions that influence adsorption are unknown. In this study, bamboo biochar and softwood biochar were chosen as the representative materials and the model pharmaceuticals were naproxen and paracetamol. To further investigate the physical-chemical interactions, two nonpolar adsorbates, para-xylene and dimethylnaphthalene, were tested...
November 27, 2018: Chemosphere
Kien Tiek Wong, Pichiah Saravanan, In Wook Nah, Jaeyoung Choi, Chulhwan Park, Namchan Kim, Yeomin Yoon, Min Jang
In this study, magnetic layered double hydroxides (mag-LDHs) were synthesized through compositing magnetite with three different metals (Mg, Cu and Al) under ultrasound (US, 100 kHz frequency and 50 W power). For the first time, mag-LDHs were applied to sonocatalytic reduction of nitrate (NO3 - ) and the reduction mechanism were determined by conducting kinetic tests and various spectroscopic analyses. Based on the kinetic data, NO3 - reduction and the selectivity for N2 highly depends on the ratio between Mg/Al, solution pH and sonication frequency...
November 27, 2018: Chemosphere
Katherine T Peter, Skuyler Herzog, Zhenyu Tian, Christopher Wu, John E McCray, Katherine Lynch, Edward P Kolodziej
The hyporheic zone (HZ), located at the interface of surface and groundwater, is a natural bioreactor for attenuation of chemical contaminants. Engineered HZs can be incorporated into stream restoration projects to enhance hyporheic exchange, with flowpaths optimized to promote biological habitat, water quantity, and water quality improvements. Designing HZs for in-stream treatment of stormwater, a significant source of flow and contaminant loads to urban creeks, requires assessment of both the hydrology and biogeochemical capacity for water quality improvement...
November 23, 2018: Water Research
Jean-Sean Tay, Billy Bing Liang Choong, Ing Hong Ooi, Bee Siew Tan
The purpose of this study was to investigate the effect of substituting triethyleneglycol dimethacrylate (TEGDMA) with 2,2,2-trifluoroethyl methacrylate (TFEMA) on water sorption, water solubility, degree of conversion, polymerization shrinkage, fluoride release and flexural strength of bisphenol-A-glycerolate dimethacrylate (Bis-GMA)/TEGDMA/urethane dimethacrylate (UDMA) dental composites. Flexural strength, water sorption and water solubility were measured according to ISO 4049 standard. Degree of conversion was determined by FTIR technique...
December 1, 2018: Dental Materials Journal
Niloufar Nekouei Marnani, Afsaneh Shahbazi
The synergistic combination of two different environmentally friendly functional groups (EDTA and Chitosan) with magnetic graphene oxide (mGO) nano-sheets was used for synthesizing a promising nanobiocomposite adsorbent (CS-EDTA-mGO) for efficient removal of a cationic dye, Rhodamine B (RhB), from aqueous solutions. CS-EDTA-mGO nanobiocomposite was characterized by XRD, FTIR, VSM, TGA, and zeta potential. Further, the morphological features of the synthesized graphene oxide and mGO were examined by SEM technique...
November 16, 2018: Chemosphere
Ellen H Winstanley, Katherine Morris, Liam G Abrahamsen-Mills, Richard Blackham, Samuel Shaw
Iron (oxyhydr)oxide nanoparticles are known to sorb metals, including radionuclides, from solution in various environmental and industrial systems. Effluent treatment processes including the Enhanced Actinide Removal Plant (EARP) (Sellafield, UK) use a neutralisation process to induce the precipitation of iron (oxyhydr)oxides to remove radionuclides from solution. There is a paucity of information on mechanism(s) of U(VI) removal under conditions relevant to such industrial processes. Here, we investigated removal of U(VI) from simulated effluents containing 7...
November 22, 2018: Journal of Hazardous Materials
Marcel Mikeska, Adam Burečcek, Ondčrej Dutko, Pavlína Peikertová, Jana Kupková, Lumír Hružík, Daniela Plachá
Organically modified vermiculites can be used as nanostructured adsorbents of organic compounds from waters or gaseous phases similarly as organically modified smectites or bentonites. There is a large amount of research data focused on adsorption properties of organoclays, however only a little information is about their post-sorption treatment. This work is focused on study of two possible ways of subsequent processing of organovermiculite after its use as sorbent for heavily polluted waste water. At first, the vermiculite modified with hexadecylpyridinium ions was used in batch static sorption against phenol ammonium water from the coke industry to get highly contaminated sorption material, especially containing organic hydrocarbons and their derivatives...
May 1, 2019: Journal of Nanoscience and Nanotechnology
David J Cocovi-Solberg, Maria Rosende, Michal Michalec, Manuel Miró
In this work, inexpensive manufacturing of unibody transparent mesofluidic platforms for pressure-driven Lab-On-a-Valve (LOV) methodologies is accomplished via rapid one-step 3D prototyping from digital models by user-friendly freeware. Multichannel architecture having 800-1800 µm cross-section features with unconventional 3D conduit structures and integrating optical and electrochemical detection facilities is for the first time reported. User-defined flow-programming capitalizing upon software control for automatic liquid handling is synergistically combined with additive manufacturing harnessing stereolithographic 3D printing so as to launch the so-called 4th generation of micro-flow analysis (3D-µFIA)...
December 2, 2018: Analytical Chemistry
Jianzhe Ma, Yang Lei, Muhammad Asim Khan, Fengyun Wang, Yuting Chu, Wu Lei, Mingzhu Xia, Sidi Zhu
This paper describes a modification method of Na-montmorillonite (Na-Mt) with carboxymethyl-chitosan (CMC). The as-prepared samples were analyzed by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface analyzer and thermogravimetric analysis (TGA). Two common tetracycline antibiotics, tetracycline (TET) and chlortetracycline (CTC), were selected as the represented pollutants and adsorbed by CMC-Mt under different experimental conditions. The intercalation of CMC obviously amplified the basal spacing of the interlayers confirmed by XRD measurements and improved the adsorption capacities of montmorillonite to some degree...
November 27, 2018: International Journal of Biological Macromolecules
Irina Timofeeva, Mariya Alikina, Anna Vlasova, Mikhail Osmolowsky, Mikhail Voznesenskiy, Olga Volina, Leonid Moskvin, Olga Osmolovskaya, Andrey Bulatov
In this study, Fe3O4-based composite magnetic nanoparticles were found to separate volatile compounds directly in the gas phase for the first time. The phenomenon of H2Se sorption on the magnetic nanoparticles was studied in detail and applied for separation and preconcentration. The developed approach was applied for the determination of selenium in dietary supplement samples after microwave digestion by ETA-AAS as a proof-of-concept example.
November 29, 2018: Analyst
Joanna Dobrzyńska, Marzena Dąbrowska, Rafał Olchowski, Ryszard Dobrowolski
A gold(III)-imprinted thiocyanato-functionalized silica network of type SBA-15 was prepared by co-condensation of tetraethoxysilane (TEOS) with thiocyanatopropyltriethoxysilane (TCTES) in the presence of Pluronic123 and Au(III) ions. Compared to the non-imprinted material, the imprint has a higher selectivity and adsorption capacity for Au(III). The maximum static adsorption capacity for Au(III) is 475 mg·g-1 for the ion-imprinted, and 62 mg·g-1 for the non-imprinted sorbent. The imprint was applied to the sorption of Au(III) from digested geological samples prior to its determination by graphite furnace atomic absorption spectrometry...
November 28, 2018: Mikrochimica Acta
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