Author
M. Helen Kalavathy
Bio: M. Helen Kalavathy is an academic researcher from Anna University. The author has contributed to research in topics: Adsorption & Activated carbon. The author has an hindex of 7, co-authored 12 publications receiving 874 citations.
Papers
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TL;DR: Adsorption mechanism studies revealed that the process was complex and followed both surface adsorption and particle diffusion and the rate-controlling parameter and effective diffusion coefficient were determined using the Reichenberg plot.
545 citations
TL;DR: The pseudo-second-order model was found to explain the kinetics of Cu(2+) adsorption most effectively and is found to be the optimum conditions for the maximum uptake of copper ions in batch mode.
168 citations
TL;DR: In this article, the effects of various operating variables such as solution pH, contact time, carbon dose, adsorbate concentration and temperature on the removal of metal ions have been studied.
105 citations
TL;DR: In this article, a modified rubber wood (Hevea brasiliensis) saw dust (RSD) was modified using phosphoric acid and sodium hydroxide with different impregnation ratios (IR) to improve adsorption capacity for the removal of copper from aqueous solutions.
74 citations
TL;DR: An indigenously prepared zinc chloride activated Ipomoea carnea (morning glory), a low-cost and abundant adsorbent, was used for removal of Cu(II) ions from aqueous solutions in a batch adsorption system as mentioned in this paper.
Abstract: An indigenously prepared zinc chloride activated Ipomoea carnea (morning glory), a low-cost and abundant adsorbent, was used for removal of Cu(II) ions from aqueous solutions in a batch adsorption system. The chemical activating agent ZnCl2 was dissolved in deionised water and then added to the adsorbent in two different ratios 1:1 and 1:0.5 adsorbent to activating agent ratio by weight. Studies were conducted as a function of contact time, initial metal concentration, dose of adsorbent, and pH. Activated Ipomoea carnea (AIC) were characterised using scanning electron microscopy (SEM), iodine number and methylene blue number. High iodine numbers indicates development of micro pores with zinc chloride activation. Maximum adsorption was noted within pH range 6.0(±0.05). Adsorption process is fast initially and reaches equilibrium after about 4 hours. The kinetic data were analysed using pseudo-first-order and pseudo-second-order models. The pseudo-second-order kinetic model was found to agree well with the experimental data. Adsorption equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The Langmuir model represented the sorption process better than the Freundlich model. Based on the Langmuir isotherm, the monolayer adsorption capacity of Cu(II) ions was 7.855 mg g−1 for AIC (1:1) and 6.934 mg g−1 for AIC (1:0.5).
28 citations
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TL;DR: Coconut husk-based activated carbon was shown to be a promising adsorbent for removal of methylene blue from aqueous solutions and was found to follow closely the pseudo-second-order kinetic model.
995 citations
TL;DR: It is evident from the revision made that AC prepared from both conventional and non-conventional wastes might effectively compete with the commercial ones.
905 citations
TL;DR: The adsorption characteristics of 2,4,6-trichlorophenol on activated carbon prepared from oil palm empty fruit bunch (EFB) were evaluated and Boyd plot revealed that the advertisersorption of TCP on the activated carbon was mainly governed by particle diffusion.
621 citations
557 citations
TL;DR: In this article, the effective removal of heavy metals from aqueous wastes is among the most important issues for many industrialized countries, and the results indicate that the second-order model best describes adsorption kinetic data.
493 citations