Borax sludge is the waste produced by a trommel sieve in the borax production process and is used as an adsorbent for Cr(III) removal. The effects of various parameters, including pH, initial Cr(III) concentration and contact time were investigated for batch adsorption of Cr(III). The experimental results obtained were applied to different adsorption isotherms and kinetic models. The results indicated that the Temkin isotherm (R 2 = 0.9749) was most suitable to explain the adsorption characteristics of borax sludge, and the removal of Cr(III) was achieved by a physisorption process. The overall kinetic data fitted the pseudo-second order rate model (R 2 = 0.9990). According to thermodynamic studies, which were carried out at different temperatures, changes in enthalpy (ΔH) and entropy (ΔS) values for Cr(III) adsorption by borax sludge were determined to be 69.395 kJ/mol and 0.276 kJ/mol K, respectively. The study implied that borax sludge could be used as an alternative adsorbent in the adsorption of Cr(III) from aqueous solutions.
Breast milk is suggested as the best method for baby nourishment by The World Health Organization (WHO, 2003). However, in some cases, breastfeeding is not possible due to different metabolic reasons. In such cases, an infant formula that is similar to the breast milk content is designed to meet infant nourishment requirements during the first 6 months after birth. It is important to know the content of infant milk formula for a baby's health. The purpose of this presented study is to determine the elemental (Fe, Cu, Al, Cd, As, Ni, Ba) contents of the four different brands of first infant milk formula sold in the Turkish markets. Elemental contents of samples were identified by Inductively Coupled Plasma Atomic Emission Spectrometer (ICP-OES) after a microwave digestion process. Target hazard quotients (THQ) of analyzed elements were calculated and risk analyses were conducted. According to the results, the hazard indexes (HI) of infant milk formula samples were founded as less than 1 and all samples were included in the low risk group. UDC Classification: 66.03; DOI: http://dx
Abstract:The invention of mesoporous materials is of significant interest to many scientists worldwide. The Mobil Crystalline Materials No 41 (MCM-41) is a well-known mesoporous molecular sieve that was discovered in 1992 by a scientist at the Mobil Oil Corporation. The MCM-41 is widely used in catalysis, ion exchange, drug delivery, optics, gas sensing, and sorption. In this study, the surface of a mesoporous silica MCM-41, synthesized from pure silica, is functionalized with a methyl group by grafting. The synthesized and functionalized samples are characterized by X-ray powder diffractometer (XRD), and the functionalized sample are also characterized by Fourier transform infrared spectroscopy (FTIR). The textural properties of the samples are determined using N2 adsorption and desorption analysis. Thermal behaviors of the samples are analyzed using thermogravimetry (TG) and derivative thermogravimetry (DTG). The results of the analyses show that the functionalization of the synthesized material through grafting was accomplished with the surface area of the functionalized sample determined as 600.87 m 2 g -1 .UDC Classification: 66.03; DOI: http://dx
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