Coal fly ash supported nZnO for the sorption of triphenyltin chloride/

Abstract

A laboratory study was performed to study the effects of various operating factors, viz. adsorbent dose, contact time, solution pH, stirring speed, initial concentration and temperature on the adsorption of triphenyltin chloride (TPT) onto coal fl y ash supported nZnO (CFAZ). The adsorption capacity increases with increase in the adsorbent amount, contact time, pH, stirring speed and initial TPT concentration, and decrease with increase in the solution temperature. The adsorption data have been analyzed by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) adsorption models to determine the mechanistic parameters associated with the adsorption process while the kinetic data were analyzed by pseudo fi rst-order, pseudo second-order, Elovich, fractional power and intraparticle diffusivity kinetic models. The thermodynamic parameters of the process were also determined. The results of this study show that 0.5 g of CFAZ was able to remove up to 99.60% of TPT from contaminated natural seawater at 60 min contact time, stirring speed of 200 rpm and at a pH of 8. It was also found that the equilibrium and kinetic data fi tted better to Freundlich and pseudo second-order models, respectively. It can therefore be concluded that CFAZ can be effectively used for shipyard process wastewater treatment.

Minimisation of environmental effects related with storing fly ash from combustion of hard coal

“…This fact formed the basis for doing an ignition losses test (weight method). During preliminary tests the parameters characterizing the processed ash were determined: density 2.27 g/cm 3 , bulk density 0.364 g/cm 3 , angle of natural build-up 32°. In test No.…”

“…Wólczańska 171/173, 90-924 Łódź, Poland. 3 Institute of Leather Industry, ul. Zgierska 73, 91-462 Łódź, Poland, corresponding author, e-mail: k.lawinska@ips.lodz.pl 4 Polytechnic Faculty, Department of Basis of Environmental Engineering, The President Stanislaw Wojciechowski State University of Applied Sciences in Kalisz, Nowy Świat 4, 62-800 Kalisz, Poland.…”

“…Coal fly ash is a by-product of the combustion of coal in electric power generating plants. It consists of powdery particles that are spherical in shape, and mostly glassy in nature [3]. Reference data shows that ash with finer graining is characterised by a larger content of the vitreous phase, while coarser grades are dominated by unburned coal particles [4].…”

Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

“…This result could be caused by the presence of both components, CFA and HAp, whose pH PZC values vary greatly. The pH PZC of CFA was found to be 8.1 [66], 10.70 [76], and 12.17 [77], depending on its origin and composition. The pH PZC of HAp occurs in a wide range, including 3.0 [78], 4.6 and 5.8 [33], 6.22-6.64 [79], and 7.9 [80], and strongly depends on the synthesis conditions and precursor types.…”

Preparation, characterization of a ceria loaded carbon nanotubes nanocomposites photocatalyst and degradation of azo dye Acid Orange 7

“…In addition, the total decolorization rate of Acid Orange 7 by the CeO 2 /CNTs nanocomposites photocatalyst was as high as 80.58%, and the optical decolorization rate was 66.58% after xenon lamp irradiation for 4 h, which is better than that of commercial CeO 2 (i.e., 43.13%). This result may be due to the adsorption capacity of commercial CeO 2 being lower than that of CeO 2 /CNTs, which resulted in the Acid Orange 7 molecules being more weakly adsorbed on the surface of commercial CeO 2 and affecting its subsequent optical decolorization performance , Ayanda et al 2015. Fig.…”