Sorption of dye from aqueous solution by peat
TL;DR: In this paper, the sorption of two dyes, namely Basic Blue 69 and Acid Blue 25 onto peat has been studied in terms of pseudo-second order and first order mechanisms for chemical sorption as well as an intraparticle diffusion mechanism process.
About: This article is published in Chemical Engineering Journal.The article was published on 1998-06-01. It has received 3502 citations till now. The article focuses on the topics: Sorption.
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TL;DR: It is evident from a literature survey of about 210 recent papers that low-cost sorbents have demonstrated outstanding removal capabilities for certain dyes, and chitosan might be a promising adsorbent for environmental and purification purposes.
3,906 citations
TL;DR: An overview of second-order kinetic expressions is described in this paper based on the solid adsorption capacity, which shows that a pseudo-second-order rate expression has been widely applied to the Adsorption of pollutants from aqueous solutions onto adsorbents.
3,458 citations
Cites background from "Sorption of dye from aqueous soluti..."
...Although there are many factors which influence the adsorption capacity, including the initial adsorbate concentration [12,48–51], the reaction temperature [10,12,50], the solution pH value [52,53], the adsorbent particle size [48] and dose [12,48,51], and the nature of the solute [12,54], a kinetic model is concerned only with the effect of observable parameters on the overall rate....
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TL;DR: From a comprehensive literature review, it was found that some LCAs, in addition to having wide availability, have fast kinetics and appreciable adsorption capacities too.
3,163 citations
01 Aug 2004
TL;DR: The theoretical results (derived equations) show that the observed rate constants of pseudo-first-order and pseudo-second-order models are combinations of adsorption and desorption rate constants and also initial concentration of solute.
Abstract: The kinetics of sorption from a solution onto an adsorbent has been explored theoretically. The general analytical solution was obtained for two cases. It has been shown that at high initial concentration of solute (sorbate) the general equation converts to a pseudo-first-order model and at lower initial concentration of solute it converts to a pseudo-second-order model. In other words, the sorption process obeys pseudo-first-order kinetics at high initial concentration of solute, while it obeys pseudo-second-order kinetics model at lower initial concentration of solute. The theoretical results (derived equations) show that the observed rate constants of pseudo-first-order and pseudo-second-order models are combinations of adsorption and desorption rate constants and also initial concentration of solute. The obtained theoretical equations are used to correlate experimental data for sorption kinetics of some solutes on various sorbents. The predictions of the theory are in excellent agreement with the experimental data.
1,860 citations
TL;DR: The inaccurate use of technical terms, the problem associated with quantities for measuring adsorption performance, the important roles of the adsorbate and adsorbent pKa, and mistakes related to the study of adsor adaptation kinetics, isotherms, and thermodynamics are discussed.
1,691 citations
References
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TL;DR: In this paper, it was shown that the rate of adsorption of persistent organic compounds on granular carbon is quite low and the rate is partially a function of the pore size distribution of the adsorbent, of the molecular size and configuration of the solute, and of the relative electrokinetic properties of adsorbate and adsorbents.
Abstract: Laboratory investigations show that rates of adsorption of persistent organic compounds on granular carbon are quite low. Intraparticle diffusion of solute appears to control the rate of uptake, thus the rate is partially a function of the pore size distribution of the adsorbent, of the molecular size and configuration of the solute, and of the relative electrokinetic properties of adsorbate and adsorbent. Systemic factors such as temperature and pH will influence the rates of adsorption; rates increase with increasing temperature and decrease with increasing pH. The effect of initial concentration of solute is of considerable significance, the rate of uptake being a linear function of the square-root of concentration within the range of experimentation. Relative reaction rates also vary reciprocally with the square of the diameter of individual carbon particle for a given weight of carbon. Based on the findings of the research, fluidized-bed operation is suggested as an efficient means of using adsorption for treatment of waters and waste waters.
7,115 citations
TL;DR: In this article, the effect of initial dye concentration, wood particle size and temperature on the initial sorption rate of Basic Blue 69 and Acid Blue 25 onto wood has been studied in terms of pseudo-second order, intraparticle diffusion and pseudo-first order chemical sorption processes.
1,404 citations
TL;DR: In this article, the removal of Cu(II) by adsorption on fly ash has been found to be concentration, pH and temperature dependent, indicating the process to be diffusion controlled.
513 citations
TL;DR: In this paper, the adsorption of Telon Blue (Acid Blue 25) on peat has been investigated and the effects of contact time, initial dye concentration and peat particle size were studied.
450 citations
TL;DR: In this article, the batch adsorption of Ni(II) onto sphagnum moss peat has been studied, and the reaction was pH dependent, the optimum range being 4.0-7.0.
409 citations