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bentonite clay

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https://www.readbyqxmd.com/read/29666549/reinforced-cassava-starch-based-edible-film-incorporated-with-essential-oil-and-sodium-bentonite-nanoclay-as-food-packaging-material
#1
Butsadee Iamareerat, Manisha Singh, Muhammad Bilal Sadiq, Anil Kumar Anal
Biodegradable packaging in food materials is a green technology based novel approach to replace the synthetic and conventional packaging systems. This study is aimed to formulate the biodegradable cassava starch based films incorporated with cinnamon essential oil and sodium bentonite clay nanoparticles. The films were characterized for their application as a packaging material for meatballs. The cassava starch films incorporated with sodium bentonite and cinnamon oil showed significant antibacterial potential against all test bacteria; Escherichia coli , Salmonella typhimurium and Staphylococcus aureus...
May 2018: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/29661660/epipremnum-aureum-and-dracaena-braunii-as-indoor-plants-for-enhanced-bio-electricity-generation-in-a-plant-microbial-fuel-cell-with-electrochemically-modified-carbon-fiber-brush-anode
#2
Pranab Jyoti Sarma, Kaustubha Mohanty
In this study, two different unexploited indoor plants, Epipremnum aureum and Dracaena braunii were used to produce clean and sustainable bio-electricity in a plant microbial fuel cell (PMFC). Acid modified carbon fiber brush electrodes as well as bare electrodes were used in both the PMFCs. A bentonite based clay membrane was successfully integrated in the PMFCs. Maximum performance of E. aureum was 620 mV which was 188 mV higher potential than D. braunii. The bio-electricity generation using modified electrode was 154 mV higher than the bare carbon fiber, probably due to the effective bacterial attachment to the carbon fiber owing to hydrogen bonding...
April 13, 2018: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/29653300/comparison-of-solvent-extraction-and-extraction-chromatography-resin-techniques-for-uranium-isotopic-characterization-in-high-level-radioactive-waste-and-barrier-materials
#3
Santiago Hurtado-Bermúdez, María Villa-Alfageme, José Luis Mas, María Dolores Alba
The development of Deep Geological Repositories (DGP) to the storage of high-level radioactive waste (HLRW) is mainly focused in systems of multiple barriers based on the use of clays, and particularly bentonites, as natural and engineered barriers in nuclear waste isolation due to their remarkable properties. Due to the fact that uranium is the major component of HLRW, it is required to go in depth in the analysis of the chemistry of the reaction of this element within bentonites. The determination of uranium under the conditions of HLRW, including the analysis of silicate matrices before and after the uranium-bentonite reaction, was investigated...
April 5, 2018: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29619873/synthesized-and-characterization-of-organobentonite-for-anionic-dye-removal-application-to-real-textile-effluent
#4
F Ayari, S Khelifi, M Trabelsi-Ayadi
Clays have been considered as potential alternative adsorbent due to their high adsorptive property, abundance and non toxic compounds. Adsorption of cationic dyes by natural clays have been studied and appreciable results have been reported, but few have been interested in anionic dyes, widely used by the textile industries, yet they are toxic, non-biodegradable and hardly adsorbable on natural clay, modified clay have emerged as an alternative adsorbent such as organoclay. In this study, organobentonite was prepared with hexadecyltrimethylammonium bromide (HDTMA) at three cation exchange capacity (CEC) levels and used as adsorbents for the removal of, reactive blue II (RBII- ); anionic dye used in Tunisian textile industry specialized on dyeing jeans...
April 5, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29618247/preparation-and-application-of-a-new-crosslinked-polyammonium-as-a-shale-inhibitor
#5
Ye Zhengqin, Ye Zhongbin, Huang Lei, Bai Yun, Li Lili, Zhang Jie, Qu Chentun, Chen Gang
BACKGROUND: Despite the fact that a number of traditional shale inhibitors have been utilized widely in drilling operations, the same additive may be unfavorable for different drilling due to environmental protection requirements which limit scales of use. Hence, a series of polyammonium compounds was prepared from dimethylamine, epichlorohydrin, and melamine (DEM). METHODS: To concentrate our efforts, we used both standard and extra methods to investigate the inhibitive properties of a melamine crosslinking agent using mud balls immersion tests, linear expansion measurements, laser particle distribution measurements, thermogravimetric analysis, and scanning electron microscopy...
January 2018: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/29602071/-ce-al-oxide-pillared-bentonite-a-high-affinity-sorbent-for-plutonium
#6
Yangchun Leng, Qintang Li, Qiang Tian, Xiaoyuan Chen, László Almásy, Yuliang Liu, Guangai Sun, Xianguo Tuo, Minhao Yan, Mark J Henderson
The ability of bentonite and montmorillonite pillared by Al-oxide and mixed (Ln-Al)-oxides (Ln = La, Ce) to remove239 plutonium solution species from water is comparatively investigated at pH 7 and pH 4. Small-angle scattering and neutron contrast variation with H2 O/D2 O mixtures is used to verify the ingress of water in the calcined products after hydrophilicity was introduced by an NH3 -H2 O vapor treatment. The size and shape of the (La/Ce)-Al oxo-hydroxy pillaring cations (2 nm spheres) is determined by small-angle x-ray scattering from the pillaring solutions...
March 16, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29589244/performance-and-mechanisms-of-thermally-treated-bentonite-for-enhanced-phosphate-removal-from-wastewater
#7
Xiang Chen, Lu Wu, Feng Liu, Pei Luo, Xuliang Zhuang, Jinshui Wu, Zhenke Zhu, Shengjun Xu, Guixian Xie
Optimization of clays as adsorbent for low concentration phosphorus removal from wastewater has received increasing attention in recent years. This study explored the feasibility of using bentonite as an adsorbent for phosphate (P) removal from synthetic wastewater, by assessing the performance of thermally treated bentonite for P removal and elucidating the mechanisms of P adsorption. Natural bentonite (B25) was thermally treated at 100-1000 °C (B100-B1000) for 2 h. Physical and chemical properties were measured by the SEM, XRD, pore size distribution, EDX, and cation exchange capacity (CEC) methods...
March 27, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29549799/lanthanum-modified-drinking-water-treatment-residue-for-initial-rapid-and-long-term-equilibrium-phosphorus-immobilization-to-control-eutrophication
#8
Changhui Wang, Yu Wu, Youquan Wang, Leilei Bai, Helong Jiang, Juhua Yu
This study presents an approach for developing inactivating materials to achieve an initial rapid and a long-term equilibrium P immobilization to control eutrophication based on drinking water treatment residue (DWTR), which is a byproduct of potable water production. By taking advantage of the long-term equilibrium P adsorption by DWTR, the La chemical properties, and the previous success of using La-modified bentonite clay (Phoslock® ), we used DWTR as a La carrier with different ratios to develop the specific materials...
March 9, 2018: Water Research
https://www.readbyqxmd.com/read/29549259/removal-of-metal-ions-and-humic-acids-through-polyetherimide-membrane-with-grafted-bentonite-clay
#9
Raghavendra S Hebbar, Arun M Isloor, Balakrishna Prabhu, Inamuddin, Abdullah M Asiri, A F Ismail
Functional surfaces and polymers with branched structures have a major impact on physicochemical properties and performance of membrane materials. With the aim of greener approach for enhancement of permeation, fouling resistance and detrimental heavy metal ion rejection capacity of polyetherimide membrane, novel grafting of poly (4-styrenesulfonate) brushes on low cost, natural bentonite was carried out via distillation-precipitation polymerisation method and employed as a performance modifier. It has been demonstrated that, modified bentonite clay exhibited significant improvement in the hydrophilicity, porosity, and water uptake capacity with 3 wt...
March 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29525753/desorption-and-mobility-mechanisms-of-co-existing-polycyclic-aromatic-hydrocarbons-and-heavy-metals-in-clays-and-clay-minerals
#10
Mohsen Saeedi, Loretta Y Li, John R Grace
The effects of soil components such as clay minerals and as humic acids, as well as co-existing metals and polycyclic aromatic hydrocarbons, on desorption and mobility are examined. Three types of artificially blended clay and clay mineral mixtures (pure kaolinite, kaolinite + sand and kaolinite + sand + bentonite), each with different humic acid content, were tested for desorption and mobility of acenaphthene, fluorene and fluoranthene by three extracting solutions CaCl2 (0.01 M) and EDTA (0.01M) with non-ionic surfactants (Tween 80 and Triton X100)...
March 8, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29509416/preparation-characterization-and-in-vitro-testing-of-nano-clay-antimicrobial-activities-and-elicitor-capacity
#11
Danila Merino, Andrea Yamila Mansilla, Claudia A Casalongué, Vera Alejandra Alvarez
Clay based nanocomposites (nano-clays) are interesting systems to hold a wide type of active substances with a wide field of industrial applications. Bentonite-Chitosan nano-clay was obtained via cationic exchange of natural bentonite (Bent) with an aqueous solution of chitosan (CS). Their physicochemical and morphological properties were discussed under the light of Fourier Transform Infrared Spectroscopy, X-ray diffraction, Thermogravimetric analysis and Scanning electron microscopy. Bent-CS characterization indicated that CS was intercalated in a 10% w/w...
March 6, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29475706/evaluation-of-the-ability-of-calcite-bentonite-and-barite-to-enhance-oil-dispersion-under-arctic-conditions
#12
Ronan Jézéquel, Justine Receveur, Tim Nedwed, Stéphane Le Floch
A test program was conducted at laboratory and pilot scale to assess the ability of clays used in drilling mud (calcite, bentonite and barite) to create oil-mineral aggregates and disperse crude oil under arctic conditions. Laboratory tests were performed in order to determine the most efficient conditions (type of clay, MOR (Mineral/Oil Ratio), mixing energy) for OMA (Oil Mineral Aggregate) formation. The dispersion rates of four crude oils were assessed at two salinities. Dispersion was characterized in terms of oil concentration in the water column and median OMA size...
February 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29471976/organic-contaminant-removal-efficiency-of-sodium-bentonite-clay-bc-mixtures-in-high-permeability-regions-utilizing-reclaimed-wastewater-a-meso-scale-study
#13
Yang Xiao, Yunkai Li, Zigong Ning, Pengxiang Li, Peiling Yang, Chengcheng Liu, Zhongwei Liu, Feipeng Xu, Paul Dylan Hynds
Wastewater reclamation now represents an effective measure for sustainable water resource management in arid regions, however wastewater components (organic micropollutants) may potentially impact local ecological and/or human health. Previous studies have shown that sodium bentonite/natural clay (BC) mixes may be used to effectively reduce riverbed infiltration in regions characterized by excessively high hydraulic conductivity. Accordingly, the current study sought to investigate the contaminant removal efficiency (Re) of several BC mass ratios in simulated dry riverbeds...
January 31, 2018: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/29465808/investigating-the-potential-barrier-function-of-nanostructured-materials-formed-in-engineered-barrier-systems-ebs-designed-for-nuclear-waste-isolation
#14
REVIEW
Jaime Cuevas, Ana Isabel Ruiz, Raúl Fernández
Clay and cement are known nano-colloids originating from natural processes or traditional materials technology. Currently, they are used together as part of the engineered barrier system (EBS) to isolate high-level nuclear waste (HLW) metallic containers in deep geological repositories (DGR). The EBS should prevent radionuclide (RN) migration into the biosphere until the canisters fail, which is not expected for approximately 103 years. The interactions of cementitious materials with bentonite swelling clay have been the scope of our research team at the Autonomous University of Madrid (UAM) with participation in several European Union (EU) projects from 1998 up to now...
February 21, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/29457717/oedometric-small-angle-neutron-scattering-in-situ-nano-pore-structure-during-bentonite-consolidation-and-swelling-in-co2-environments
#15
Thomas Dewers, Jason E Heath, Charles R Bryan, Joseph T Mang, Rex Paul Hjelm, Mei Ding, Mark Taylor
Results of oedometric consolidation experiments linked with small-angle neutron scattering (SANS) measurements are presented, using SWy-2 Wyoming bentonite clay in dry and water-bearing N2 and CO2 atmospheres. Oedometric SANS involves deforming a porous sample under uniaxial strain conditions with applied axial force and internal pore pressure control, and combines with SANS for in situ observation of pore structure evolution and interaction. Scattering from both interlayer (clay intra-aggregate) and free (inter-aggregate) pores is observed, showing decreasing pore size with dry consolidation and interactions between interlayer and free pore types with swelling and consolidation...
February 19, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29441378/iron-montmorillonite-clays-as-active-sorbents-for-the-decontamination-of-hazardous-chemical-warfare-agents
#16
F Carniato, C Bisio, C Evangelisti, R Psaro, V Dal Santo, D Costenaro, L Marchese, M Guidotti
A class of heterogeneous catalysts based on commercial bentonite from natural origin, containing at least 80 wt% of montmorillonite clay, was designed to transform selectively and under mild conditions toxic organosulfur and organophosphorus chemical warfare agents into non-noxious products with a reduced impact on health and environment. The bentonite from the natural origin was modified by introducing iron species and acid sites in the interlayer space, aiming to obtain a sorbent with strong catalytic oxidising and hydrolytic properties...
February 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29438286/hdpe-chitosan-blends-modified-with-organobentonite-synthesized-with-quaternary-ammonium-salt-impregnated-chitosan
#17
Maria José G de Araújo, Rossemberg C Barbosa, Marcus Vinícius L Fook, Eduardo L Canedo, Suédina M L Silva, Eliton S Medeiros, Itamara F Leite
In this study, blends based on a high density polyethylene (HDPE) and chitosan (CS) were successfully prepared by melt processing, in a laboratory internal mixer. The CS biopolymer content effect (up to maximum of 40%), and, the addition of bentonite clay modified with quaternary ammonium salt (CTAB) impregnated chitosan as a compatibilizing agent, on the properties of the blends was analyzed by Fourier transform-infrared spectroscopy (FT-IR), wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermogravimetric analyses (TG), tensile strength, and scanning electron microscopy (SEM)...
February 13, 2018: Materials
https://www.readbyqxmd.com/read/29433257/incorporation-of-bentonite-clay-in-cassava-starch-films-for-the-reduction-of-water-vapor-permeability
#18
M K S Monteiro, V R L Oliveira, F K G Santos, E L Barros Neto, R H L Leite, E M M Aroucha, R R Silva, K N O Silva
Complete factorial planning 23 was applied to identify the influence of the cassava starch(A), glycerol(B) and modified clay(C) content on the water vapor permeability(WVP) of the cassava starch films with the addition of bentonite clay as a filler, its surface was modified by ion exchange from cetyltrimethyl ammonium bromide. The films were characterized by X-ray diffraction(XRD), fourier transform by infrared radiation(FTIR), atomic force microscopy(AFM) and scanning electron microscopy(SEM). The factorial analysis suggested a mathematical model thats predicting the optimal condition of the minimization of WVP...
March 2018: Food Research International
https://www.readbyqxmd.com/read/29428756/effect-of-adding-clay-with-or-without-a-saccharomyces-cerevisiae-fermentation-product-on-the-health-and-performance-of-lactating-dairy-cows-challenged-with-dietary-aflatoxin-b1
#19
Y Jiang, I M Ogunade, D H Kim, X Li, A A Pech-Cervantes, K G Arriola, A S Oliveira, J P Driver, L F Ferraretto, C R Staples, D Vyas, A T Adesogan
The study was conducted to examine the effect of supplementing bentonite clay with or without a Saccharomyces cerevisiae fermentation product (SCFP; 19 g of NutriTek + 16 g of MetaShield, both from Diamond V, Cedar Rapids, IA) on the performance and health of dairy cows challenged with aflatoxin B1 (AFB1). Twenty-four lactating Holstein cows (64 ± 11 d in milk) were stratified by parity and milk production and randomly assigned to 1 of 4 treatment sequences. The experiment had a balanced 4 × 4 Latin square design with 6 replicate squares, four 33-d periods, and a 5-d washout interval between periods...
February 7, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29428710/simultaneous-removal-of-amoxicillin-ampicillin-and-penicillin-by-clay-supported-fe-ni-bimetallic-nanoparticles
#20
Xiulan Weng, Wanling Cai, Ruifang Lan, Qian Sun, Zuliang Chen
This study examined functional bentonite-supported nanoscale Fe/Ni (B-Fe/Ni) for the simultaneous removal of β-lactam antibiotics such as amoxicillin (AMX), ampicillin (AMP) and penicillin (PEN). The results show only 94.6% of AMX, 80.6% of AMP and 53.7% of PEN were removed in the mixed antibiotic solution, while 97.5% of AMX, 85.1% of AMP and 74.5% of PEN were removed in individual antibiotic solution. The decreased removal in a mixed antibiotic solution was attributed to competition between antibiotics for: firstly, active sites of iron oxide for the adsorption; and secondly, accepted electrons for the degradation in passivation of the nZVI surface...
February 8, 2018: Environmental Pollution
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