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bentonite clay

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
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
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
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
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
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
Eun-Sook Lee, Eun-Ji Song, So-Young Lee, So-Lim Park, Daeyoung Kim, Daniel Kim, Jae-Hwan Kim, Seong-Il Lim, Young-Do Nam
BACKGROUND: Bentonite is a natural clay mineral with health-promoting effects due to high adsorption abilities with high cation exchange capacity. Previously, we found an anti-obesity effect for the Bgp35b-p bentonite produced in South Korea where its high adsorbent ability of dietary lipids possibly partially removed lipidic environment in the gut (under revision). It hypothesized that Bgp35b-p affects the intestinal microbial community, thus the microbial changes were investigated via the next generation sequencing targeting bacterial 16s rRNA gene and the bioinformatics using QIIME were performed in feces of C57BL/6 male mice fed a HFD with the Bgp35b-p...
February 7, 2018: Journal of the Science of Food and Agriculture
Sundaram Jawahar, Adil Nafar, Bilal Ahmad Paray, Mohammad K Al-Sadoon, Chellam Balasundaram, Ramasamy Harikrishnan
The effect of Sodium Bentonite (SB) enriched diet on growth performance, innate immune response, and disease resistance in stinging catfish, Heteropneustes fossilis against Aeromonas hydrophila is reported. The infected fish fed with 5% SB had the maximum weight gain diet (PWG %) and specific growth rate (SGR %) were 26% and 29% when compared to 14% and 17% with 10% diet. Similarly the phagocytic activity increased significantly when infected fish were fed with 5% or 10% SB diets during the experimental period; the complement, respiratory burst and lysozyme activities were also significantly enhanced on weeks 2 and 4...
January 30, 2018: Fish & Shellfish Immunology
Patchimaporn Udomkun, Bhundit Innawong, Chatchalai Siasakul, Christopher Okafor
The effects were studied of two different adsorbent combinations (com I; bentonite: activated carbon: celite = 3:4:1 and com II; bentonite: activated clay: celite = 3:4:1 + 1% citric acid) on the physico-chemical changes of oil used continuously for deep-fat frying of chicken drumsticks. The results showed that the % FFA was reduced by 44.3, PV by 50.2, and FOS reading by 40.1% in com I whereas reductions of 41.6, 44.9, and 32.8%, respectively, were found in com II. The oil treated with com II exhibited a lighter color than with com I...
May 15, 2018: Food Chemistry
Carolina Sayury Miyashiro, Gabriela Bonassa, Lara Talita Schneider, Emanuelle Iaçana Berté Parisotto, Helton José Alves, Joel Gustavo Teleken
This work aims to evaluate the adsorption potential of bentonite and sugarcane bagasse clay for the reduction of free fatty acids in cooking oil through batch technique, experimental planning with different operating conditions (temperature, adsorbent mass and agitation). After were carried out kinetic studies and thermodynamic studies. Thus, both adsorbents were characterized by nitrogen fispersion, scanning electron microscopy with coupled energy dispersion spectroscopy. The sugarcane bagasse provided higher reductions compared to the bentonite clay, 58 and 50%, respectively...
December 29, 2017: Environmental Technology
Aisha Khatoon, Muhammad Zargham Khan, Zain Ul Abidin, Sheraz Ahmed Bhatti
A presence of mycotoxins in feed is one of the most alarming issue in the poultry feed industry. Ochratoxins, produced by several Aspergillus and Penicillium species, are important mycotoxin regarding the health status of poultry birds. Ochratoxins are further classified into to several sub-types depending upon their chemical structures i.e. ochratoxin A, B, C etc but ochratoxin A (OTA) is considered to be most important and toxic one. Bentonite clay, belonging to phyllosilicates and formed from weathering of volcanic ashes, has the adsorbing ability for several mycotoxins...
December 6, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Suchiwa Pan-On, Soravoot Rujivipat, Anan Ounaroon, Waree Tiyaboonchai
OBJECTIVE: To develop clay facial mask containing turmeric extract solid dispersion (TESD) for enhancing curcumin water solubility and permeability and to determine suitable clay based facial mask. METHODS: The TESD were prepared by solvent and melting solvent method with various TE to PVP K30 mass ratios. The physicochemical properties, water solubility and permeability were examined. The effects of clay types on physical stability of TESD, water adsorption and curcumin adsorption capacity were evaluated...
November 30, 2017: Drug Development and Industrial Pharmacy
Jock Asanja Alexander, Abdulsalam Surajudeen, El-Nafaty Usman Aliyu, Aroke Umar Omeiza, Muhammad Abbas Ahmad Zaini
The present work was aimed at evaluating the multi-metals column adsorption of lead(II), cadmium(II) and manganese(II) ions onto natural bentonite. The bentonite clay adsorbent was characterized for physical and chemical properties using X-ray diffraction, X-ray fluorescence, Brunauer-Emmett-Teller surface area and cation exchange capacity. The column performance was evaluated using adsorbent bed height of 5.0 cm, with varying influent concentrations (10 mg/L and 50 mg/L) and flow rates (1.4 mL/min and 2.4 mL/min)...
October 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Maryam Moosavi
BACKGROUND: From old times, the human kind has used clays, externally or internally, for maintaining body health or treating some diseases. Meanwhile there are few scientific articles reviewing the beneficial effects of clays on body function. Bentonite clay is one of the available clays in nature, used as traditional habits, and remedies in many cultures. METHODS: These articles explored among 2500 scientific articles published in PubMed to sort the scientific works have been done on the effects of this clay on body function (it was about 100 articles)...
September 2017: Iranian Journal of Public Health
Morteza Feizi, Mohsen Jalali, Giancarlo Renella
We comparatively assessed the effect of modified clays (MCs) (zeolite and bentonite) and nanoparticles (NPs) (ZnO and MgO) on the distribution of cadmium (Cd), copper (Cu), nickel (Ni) and zinc (Zn) fractions in a light-textured soil amended with five sewage sludges (SSs) differed in chemical properties during a 92-day incubation experiment in the laboratory. Results indicated that presence of adsorbents and incubation time were critical parameters in stabilizing metals in SS-amended soil. The adsorbents that significantly decreased the easily soluble and exchangeable of metals in SS-amended soil (rate 2%) were bentonite, ZnO and MgO for Cd and Cu, ZnO and MgO for Ni, and bentonite and MgO for Zn...
September 18, 2017: Journal of Hazardous Materials
Kasper Reitzel, Kristiane Astrid Balslev, Henning S Jensen
A 12 days laboratory study on potential desorption of Lanthanum (La) from a commercial La modified clay (Phoslock) was conducted using lake water from 17 Danish lakes with alkalinities between 0.02 and 3.7 meq L(-1) and varying concentrations of DOC and humic acids (HA's). A similar study was conducted in artificial lake water with alkalinities from 0 to 2.5 meq L(-1)in order to exclude interference from dissolved HA's. To test if La in solution (FLa) was associated with fine particles, the water samples were filtered sequentially through three filter sizes (1...
November 15, 2017: Water Research
Mohamed Salah Ayyat, Hemat Kamal Mahmoud, Abd El-Aziz Mohamed El-Hais, Khaled Mahmoud Abd El-Latif
The decline of cadmium pollution in fish farms is needed by any adequate method. The present study was designed to explore the effect of dietary cadmium contamination and its amelioration by using dietary clay, probiotic (Bactocell®), vitamin C, and vitamin E supplementation in Nile tilapia fish diet on growth rate, feed efficiency, blood components, and cadmium residues. Fish were separated into 15 groups, each group of fish was stocked into three aquaria and each contains 20 fishes. The fish of the first five groups were fed the basal diet, the second five groups were fed the basal diet contaminated with 25 mg cadmium/kg, and the third five groups were fed the same diet contaminated with 50 mg cadmium/kg...
October 2017: Environmental Science and Pollution Research International
Salima Chakroun, Mongi Herchi, Wafa Mechti, Mohamed Essghaier Gaied
In central Tunisia, many upper Eocene outcrops supply smectitic claystone which are characterized by several analytical techniques (calcimetry, XRD, SediGraph, chemical analysis, surface area, etc.). Beidellite is the main mineral detected by the XRD method. Representative raw samples M1, taken from Henchir Souar (Zaghouan, Tunisia), were acid activated in order to improve their physicochemical properties. This study consists in optimizing the activation conditions with HCl 3 N by varying the following parameters: time (2, 4, and 6 h) and temperature (25, 50, 75, and 90 °C)...
October 2017: Environmental Science and Pollution Research International
Hongbin Yin, Grant B Douglas, Yongjiu Cai, Cheng Liu, Diego Copetti
Clay-based phosphorus (P) sorbents have been increasingly used as geoengineering materials for the management sediment-derived internal P loading in eutrophic lakes. However, the long-term behavior of these sorbents has remained elusive along with their response to burial under suspended particulate matter (SPM), and their effect on macroinvertebrate communities occupying dynamic regions at the sediment-water interface of shallow and turbid lakes. In this study, field mesocosm experiments were undertaken in Lake Chaohu, China, to study the effects of the application of lanthanum-modified bentonite (LMB) and thermally-modified calcium-rich attapulgite (TCAP) on sediment internal P loading and to assess their influence on macroinvertebrate community structure...
January 1, 2018: Science of the Total Environment
Francine Bertella, Sibele B C Pergher
This work describes the synthesis and characterization of pillared clays using a new pillaring method: the reuse of the pillaring solution. First, an Al pillared clay (PILC) was synthesized, and after filtration, the pillaring agent was stored and reused for an additional three pillaring procedures (P1, P2, and P3). The filtered pillaring solution was stored for one year and then reused for one additional pillaring procedure (P4). The samples were analyzed using XRD, N₂ physisorption measurements and chemical analysis (EDX)...
June 27, 2017: Materials
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