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Journal ArticleDOI

Kinetics and thermodynamics of Methylene Blue adsorption on Neem (Azadirachta indica) leaf powder

01 Apr 2005-Dyes and Pigments (Elsevier)-Vol. 65, Iss: 1, pp 51-59
TL;DR: In this article, Methylene blue was adsorbed on an adsorbent prepared from mature leaves of the Neem tree (Azadirachta indica), and a batch adsorption study was carried out with variable adsorbate concentration, adsorbant amount, pH, and temperature.
About: This article is published in Dyes and Pigments.The article was published on 2005-04-01. It has received 690 citations till now. The article focuses on the topics: Freundlich equation & Adsorption.
Citations
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Journal ArticleDOI
TL;DR: An extensive list of various adsorbents such as natural materials, waste materials from industry, agricultural by-products, and biomass based activated carbon in the removal of various dyes has been compiled here.

2,979 citations

Journal ArticleDOI
TL;DR: It is evident from a literature survey of about 185 recently published papers that low-cost adsorbents have demonstrated outstanding removal capabilities for MB, and these include agricultural wastes, industrial solid wastes, biomass, clays minerals and zeolites.

2,493 citations

Journal ArticleDOI
TL;DR: In this paper, the use of agricultural solid wastes to remove two classes of dye, cationic and anionic dyes, was discussed and a simple comparison among cationi-and anionic dye adsorption by the same adsorbent was made, thus possibly opening the door for a better understanding of the dye-classified adaption process.

1,403 citations


Cites background from "Kinetics and thermodynamics of Meth..."

  • ...Many researchers have studied the adsorption of Methylene blue dye using agricultural solid wastes such as peanut hull [43], castor seed shell [44], coconut shell [45], guava leaf [46], neem leaf [47] and gulmohar plant [48], where the dye adsorption capacities were 123....

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Journal ArticleDOI
TL;DR: In this paper, the use of wheat shells for the removal of methylene blue from aqueous solutions at different contact times, temperatures, pH, adsorbent doses and initial dye concentration was investigated.

1,060 citations

Journal ArticleDOI
01 Sep 2011
TL;DR: Exfoliated graphene oxide and reduced graphene oxide have been used for the adsorption of various charged dyes such as methylene blue, methyl violet, rhodamine B, and orange G from aqueous solutions using UV-Visible spectroscopy and FT-IR spectroscopic techniques.
Abstract: In the present study, exfoliated graphene oxide (EGO) and reduced graphene oxide (rGO) have been used for the adsorption of various charged dyes such as methylene blue, methyl violet, rhodamine B, and orange G from aqueous solutions. EGO consists of single layer of graphite decorated with oxygen containing functional groups such as carboxyl, epoxy, ketone, and hydroxyl groups in its basal and edge planes. Consequently, the large negative charge density available in aqueous solutions helps in the effective adsorption of cationic dyes on EGO while the adsorption is negligible for anionic dyes. On the other hand, rGO that has high surface area does not possess as high a negative charge and is found to be very good adsorbent for anionic dyes. The adsorption process is followed using UV-Visible spectroscopy, while the material before and after adsorption has been characterized using physicochemical and spectroscopic techniques. Various isotherms have been used to fit the data, and kinetic parameters were evaluated. Raman and FT-IR spectroscopic data yield information on the interactions of dyes with the adsorbent.

918 citations

References
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Journal ArticleDOI
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

Book
01 Jan 1956

5,524 citations

Journal ArticleDOI
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.

3,502 citations

Journal ArticleDOI
TL;DR: Based on the adsorption capacity, it was shown that banana peel was more effective than orange peel and intraparticle diffusion of dyes within the particle was identified to be rate limiting.

1,534 citations