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https://www.readbyqxmd.com/read/29026782/bentonite-clay-as-a-natural-remedy-a-brief-review
#1
REVIEW
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
https://www.readbyqxmd.com/read/28961501/nanoparticles-and-modified-clays-influenced-distribution-of-heavy-metals-fractions-in-a-light-textured-soil-amended-with-sewage-sludges
#2
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
https://www.readbyqxmd.com/read/28858690/the-influence-of-lake-water-alkalinity-and-humic-substances-on-particle-dispersion-and-lanthanum-desorption-from-a-lanthanum-modified-bentonite
#3
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
https://www.readbyqxmd.com/read/28856593/the-role-of-some-feed-additives-in-fish-fed-on-diets-contaminated-with-cadmium
#4
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
https://www.readbyqxmd.com/read/28804805/acid-activation-of-upper-eocene-ca-bentonite-for-soybean-oil-clarification
#5
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)...
August 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28803188/remediation-of-internal-phosphorus-loads-with-modified-clays-influence-of-fluvial-suspended-particulate-matter-and-response-of-the-benthic-macroinvertebrate-community
#6
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
https://www.readbyqxmd.com/read/28773068/reuse-of-pillaring-agent-in-sequential-bentonite-pillaring-processes
#7
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
https://www.readbyqxmd.com/read/28715679/a-parametric-study-on-hydraulic-conductivity-and-self-healing-properties-of-geotextile-clay-liners-used-in-landfills
#8
Fatemeh Parastar, Sayyed Mahdi Hejazi, Mohammad Sheikhzadeh, Azam Alirezazadeh
Nowadays, the raise of excessive generation of solid wastes is considered as a major environmental concern due to the fast global population growth. The contamination of groundwater from landfill leachate compromises every living creature. Geotextile clay liner (GCL) that has a sandwich structure with two fibrous sheets and a clay core can be considered as an engineered solution to prevent hazardous pollutants from entering into groundwater. The main objective of the present study is therefore to enhance the performance of GCL structures...
July 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28695994/comparative-efficacy-of-bentonite-clay-activated-charcoal-and-trichosporon-mycotoxinivorans-in-regulating-the-feed-to-tissue-transfer-of-mycotoxins
#9
Sheraz Ahmed Bhatti, Muhammad Zargham Khan, Zahoor Ul Hassan, Muhammad Kashif Saleemi, Muhammad Saqib, Aisha Khatoon, Masood Akhter
BACKGROUND: Mycotoxins contamination in animal products and by-product is a persistent threat to food and feed industry. The present study was designed to evaluate the comparative inhibitory effects of bentonite (BN), activated charcoal (AC) and a newly discovered yeast Trichosporon mycotoxinivorans (TM) against feed-to-tissue transfer of mycotoxins. RESULTS: A dose dependent increase as determined by HPLC, in the residues of AFB1 and OTA was exhibited in the groups of birds fed AFB1 and OTA alone...
July 11, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28674686/batch-sedimentation-studies-for-freshwater-green-alga-scenedesmus-abundans-using-combination-of-flocculants
#10
Raghu K Moorthy, M Premalatha, Muthu Arumugam
Microalga is the only feedstock that has the theoretical potential to completely replace the energy requirements derived from fossil fuels. However, commercialization of this potential source for fuel applications is hampered due to many technical challenges with harvesting of biomass being the most energy intensive process among them. The fresh water microalgal species, Scenedesmus abundans, has been widely recognized as a potential feedstock for production of biodiesel (Mandotra et al., 2014). The present work deals with sedimentation of algal biomass using extracted chitosan and natural bentonite clay powder as flocculant...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28651314/stabilization-of-heavy-metals-in-soil-using-two-organo-bentonites
#11
Kai Yu, Jian Xu, Xiaohong Jiang, Cun Liu, Wesley McCall, Jinlong Lu
Stabilization of Cu, Zn, Cd, Hg, Cr and As in soil using tetramethylammonium (TMA) and dodecyltrimethylammonium (DTMA) modified bentonites (T-Bents and D-Bents) as amendments was investigated. Toxicity characteristic leaching procedure (TCLP) was used to quantify the metal mobility after soil treatment. The structural parameters of modified bentonites, including the BET surface area, basal spacing and zeta potential were obtained as a function of the TMA and DTMA loading at 40, 80, 120, 160 and 200% of the bentonite's cation exchange capacity, respectively...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28599961/charcoal-and-charcoal-based-dentifrices-a-literature-review
#12
REVIEW
John K Brooks, Nasir Bashirelahi, Mark A Reynolds
BACKGROUND: Sales of charcoal dentifrices and powders have rapidly emerged into the Internet marketplace. The authors conducted a literature review to examine the efficacy and safety of charcoal and charcoal-based dentifrices. METHODS: The authors searched the MEDLINE and Scopus databases for clinical studies on the use of charcoal and charcoal-based dentifrices and laboratory investigations on the bioactivity or toxicity of charcoal and charcoal-based dentifrices, published through February 2017...
June 7, 2017: Journal of the American Dental Association
https://www.readbyqxmd.com/read/28549407/incorporating-zataria-multiflora-boiss-essential-oil-and-sodium-bentonite-nano-clay-open-a-new-perspective-to-use-zein-films-as-bioactive-packaging-materials
#13
Mahboobeh Kashiri, Yahya Maghsoudlo, Morteza Khomeiri
Active zein films with different levels of Zataria multiflora Boiss. essential oil were produced successfully. To enhance properties of this biopolymer for food packaging applications, sodium bentonite clay was used at two levels (2 and 4%). The results indicated that the addition of Z. multiflora Boiss. essential oil caused a reduction in tensile strength and Young's modulus and slight increase in the percent of elongation at break of the films. Maximum solubility in water and water vapor permeability was observed by incorporation of 10% Z...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/28511044/bentonite-modified-with-zinc-enhances-aflatoxin-b1-adsorption-and-increase-survival-of-fibroblasts-3t3-and-epithelial-colorectal-adenocarcinoma-cells-caco-2
#14
Janaína Nones, Anita Solhaug, Gunnar Sundstøl Eriksen, Domingos Lusitâneo Pier Macuvele, Anicleto Poli, Cíntia Soares, Andrea Gonçalves Trentin, Humberto Gracher Riella, Jader Nones
Bentonites are commonly used as feed additives to reduce the bioavailability and thus the toxicity of aflatoxins by adsorbing the toxins in the gastrointestinal tract. Aflatoxins are particular harmful mycotoxins mainly found in areas with hot and humid climates. They occur in food and feedstuff as a result of fungal contamination before and after harvest. The aim of this study was to modify Brazilian bentonite clay by incorporation of zinc (Zn) ions in order to increase the adsorption capacity and consequently reduce the toxicity of aflatoxins...
May 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28488150/lanthanum-modified-bentonite-potential-for-efficient-removal-of-phosphates-from-fishpond-effluents
#15
Eyal Kurzbaum, Yasmin Raizner, Oded Cohen, Guy Rubinstein, Oded Bar Shalom
Adsorption has been suggested as an effective method for removing phosphates from agricultural wastewater effluents that contain relatively high phosphate concentrations. The present study focused on the use of a bentonite-lanthanum clay (Phoslock(®)) for reducing the dissolved phosphate concentration in fishpond effluents. Batch experiments with synthetic phosphate-spiked solutions and with fishpond effluents were performed in order to determine adsorption equilibrium isotherms and kinetics as well as to determine the efficiency of Phoslock(®) in removing phosphate from these solutions...
June 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28486167/removal-of-cyanobacteria-and-cyanotoxins-from-lake-water-by-composites-of-bentonite-with-micelles-of-the-cation-octadecyltrimethyl-ammonium-odtma
#16
Assaf Sukenik, Yehudit Viner-Mozzini, Mordechay Tavassi, Shlomo Nir
Cyanobacteria and their toxins present potential hazard to consumers of water from lakes, reservoirs and rivers, thus their removal via water treatment is essential. The capacity of nano-composites of Octadecyltrimethyl-ammonium (ODTMA) complexed with clay to remove cyanobacterial and their toxins from laboratory cultures and from lake water, was evaluated. Column filters packed with micelles of ODTMA complexed with bentonite and granulated were shown to significantly reduce the number of cyanobacteria cells or filaments and their corresponding toxins from laboratory cultures...
September 1, 2017: Water Research
https://www.readbyqxmd.com/read/28482527/rubber-elastomeric-nanocomposites-with-antimicrobial-properties
#17
Małgorzata Przybyłek, Mohamed Bakar, Mariola Mendrycka, Urszula Kosikowska, Anna Malm, Marta Worzakowska, Tomasz Szymborski, Karolina Kędra-Królik
In this paper we show an elastomeric nanocomposite that exhibits antibacterial and antifungal activity. It comprises a rubber blend matrix and a nanofiller, which is a modified bentonite clay (Nanobent® ZR2). We have developed innovative technology for the nanofiller incorporation into the rubber matrix. This new approach was successfully implemented in pilot production at the Polish chemical manufacturer Spoiwo (Spoldzielnia Pracy Chemiczno-Wytworczej 'Spoiwo', Radom, Poland). Here we reveal that addition of the functionalised bentonite affects the mechanical and thermal behaviour of elastomers...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28341479/a-method-for-independent-modelling-in-support-of-regulatory-review-of-dose-assessments
#18
Björn Dverstorp, Shulan Xu
Several countries consider geological disposal facilities as the preferred option for spent nuclear fuel due to their potential to provide isolation from the surface environment on very long timescales. In 2011 the Swedish Nuclear Fuel & Waste Management Co. (SKB) submitted a license application for construction of a spent nuclear fuel repository. The disposal method involves disposing spent fuel in copper canisters with a cast iron insert at about 500 m depth in crystalline basement rock, and each canister is surrounded by a buffer of swelling bentonite clay...
March 22, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28303615/rare-earth-elements-and-select-actinoids-in-the-canadian-house-dust-study
#19
P E Rasmussen, C Levesque, M Chénier, H D Gardner
Nationally representative baseline data are presented for rare earth elements (REE), thorium (Th) and uranium (U) in house dust sampled from 1025 urban homes, in units of concentrations (μg g(-1) ), loadings (μg m(-2) ), and loading rates (ng m(-2)  d(-1) ). Spearman rank correlations indicate that, in addition to outdoor sources, consumer products and building materials can influence indoor dust concentrations of REE, Th, and U. Correlations (P<.01) with numbers of occupants, dogs, and cats suggest soil track-in...
September 2017: Indoor Air
https://www.readbyqxmd.com/read/28303542/sorption-and-desorption-of-silver-ions-by-bentonite-clays
#20
Leonel Vinicius Constantino, Juliana Nunes Quirino, Alessandra Maffei Monteiro, Taufik Abrão, Paulo Sérgio Parreira, Alexandre Urbano, Maria Josefa Santos
Anthropogenic activities have increased the concentration of metal species in the environment. The toxicity of silver ions to aquatic and terrestrial organisms has required monitoring by analytical methods, besides actions to promote its control as pollutant. Sorption and desorption processes are directly related to the mobility and availability of metal ions in the environment. In this context, clay minerals can be used for pre-concentration, removal and recovery of silver ions from aqueous solution. Herein, two bentonite clays (BaVC-1 and SWy-2) were characterised and applied to investigate the sorption and desorption of silver ions...
April 2017: Environmental Science and Pollution Research International
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