Synthesis and Characterization of the Mixed Mg/Al Hydrotalcite‐Like Compounds

Abstract

A series of mixed MgAl-HTlc, Mg 12x Al x -NO 3 -HTlc (where X 5 M(III)/(M(III)1 M(II)) 5 1/3 in the starting solution) were prepared following the coprecipitation method at a constant pH under different synthesis temperatures. Their structural, textual and rheological properties were examined respectively. It is found from the results that the increase of the synthesis temperature will increase the interlayer spacing of the layered compounds, but under the room temperature, the sample shows the best crystallinity. Nitrogen adsorption isotherms were used to determine the surface areas and pore structure of these compounds, and the effect of the synthesis temperature on the surface characteristics is discussed. It is thought that the microporosity was related to the treatment temperature, and most of the samples contain large amount of micropores about 1.5 nm. The results of the hydrated diameters showed that all the samples are polydispersity, but flocculation occurred in the samples, which were prepared under higher temperatures. The flow curve of the suspension showed that the samples, which were prepared under relatively low temperatures, behaved as Newton-like behavior with a slight shear -thickening, whereas the flow curves of the other samples, which were prepared under higher temperatures, are shear-thinning, typical behavior of the flocculated system. The result of the rheology is accordant with the results of the hydrated diameters, the coagulation suspension showed the non-Newton flow behavior, whereas the other suspensions showed the Newton-like flow.Keywords Hydrotalcite-like compounds, temperature effect INTRODUCTIONHydrotalcite-like compounds (HTlc) belong to a large class of anionic and basic clays, also known as layered double hydroxide. They are composed of positively charged brucite-like [Mg(OH) 2 ] layers with trivalent cations substituting for divalent cations at the centers of octahedral sites of hydroxide sheets whose vertexes contain hydroxide ions, and each OH 2 group is shared by three octahedral cations and points toward the interlayer regions. [1] The excess positive charges of HTlcs are compensated by interlamellar anions. Although, in principle, any anion could be placed in the interlamellar space, carbonates are the anions commonly found in naturally occurring materials. They can be represented by the general formula [M II

Researches and Development of Activated Water and its Effects on Biological Growth

“…The key parameters of electrolyzed water are pH and redox potential. According to pH, it is classified to strong acidic electrolyzed water (pH<2.7), weak 166 Advance in Ecological Environment Functional Materials and Ion Industry III acidic electrolyzed water (pH 5.0-6.5), weak alkaline electrolyzed water (pH 8.0-9.5), strong alkaline electrolyzed water (pH>11) [2]. The researches on electrolyzed water show that it has influences on biological growth [24][25][26], but the influences cannot be simply described because of the complex growing process of living things.…”

“…People have noticed that activated water is different from raw water and better for healthcare many years ago. It was found that activated water have the effects on sterilization, growth-promoting of normal cells, inhibition of growth of cancer cells, promotion in growth of animals and plants [1][2][3][4]. In this paper, magnetized water, mineral and ceramic activated water and electrolyzed water are studied from the materials used in activation, the method used in getting activated water, the properties of activated water and the its effects on living things.…”

EFFECT OF COMBINED MICROWAVE-ULTRASOUND IRRADIATION IN THE STRUCTURE AND MORPHOLOGY OF HYDROTALCITE LIKE COMPOUNDS Al/Mg-CH3COO AND ITS EVALUATION IN THE SORPTION OF A REACTIVE DYE

“…or inorganic compensation anion (CO 2− 3 , SO 2− 4 , Cl − , NO − 3 , etc.) with charge n-,and x is the molar metal ratio (M(III)/(M (III)+ M(II)) with values from 0.2 to 0.33, within this interval the structure of the HT remains stable (Shu-Ping et al, 2006;Ocadiz 2015;Zarazua 2018).…”

Influence of Water Activated by Ceramic on Growth of Epidermal Cells of Newborn Mice

“…Usually, activated water is obtained by a certain method, such as electrolytic water, ultrasonic water, ozone water, magnetized water, mineral water [1,2]. By measuring pH value, surface tension, viscosity, 17 O NMR half width, Raman spectrum, ultraviolet (UV) absorbance, and other properties, it is found that activated water is different from common water [3][4][5][6][7][8]. The physical parameters, structure and clusters in water have been modified.…”

“…It has been confirmed that there is a significant effect on promoting growth of animals and plants. However, the research on its function on cells is less [5,13,14].…”