1999
DOI: 10.1080/09593332008616798
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Removal of Some Organic Dyes by Acid-Treated Spent Bleaching Earth

Abstract: Acid treated spent bleaching earth was prepared by treating spent bleaching earth, a waste material from the palm oil industry, with 20% sulphuric acid and heated at 350°C for three hours. This material can efficiently sorb a variety of organic dyes especially reactive and acid dyes, with maximum sorption capacity in the order of 2-300 mg g−1. The applicability of both the Langmuir and Freundlich isotherms to the experimental data indicates that both physicosorption and chemisorption were involved in the sorpt… Show more

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Cited by 123 publications
(58 citation statements)
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“…The wastewaters discharged from dying processes exhibit high BOD, high COD are highly coloured, hot, alkaline and contain high amounts of dissolved solids [2]. The disposal of coloured wastes such as dyes and pigments into receiving waters damages the environment, as they are carcinogenic and toxic to humans and aquatic life [3,4]. Besides the problem of colour, some dye impart non-visibility and can be modified biologically to toxic or carcinogenic compounds.…”
Section: Introductionmentioning
confidence: 99%
“…The wastewaters discharged from dying processes exhibit high BOD, high COD are highly coloured, hot, alkaline and contain high amounts of dissolved solids [2]. The disposal of coloured wastes such as dyes and pigments into receiving waters damages the environment, as they are carcinogenic and toxic to humans and aquatic life [3,4]. Besides the problem of colour, some dye impart non-visibility and can be modified biologically to toxic or carcinogenic compounds.…”
Section: Introductionmentioning
confidence: 99%
“…21 The proposed two-step process for malachite green removal was studied with low (1.0 mM) and higher (2.0 mM) concentrations of malachite green. The first step was to treat with physical process using five different types of adsorbents (activated carbon, soil, ground shrimp skeleton, ground oyster shell and ground charcoal).…”
Section: Discussionmentioning
confidence: 99%
“…The band at 2918.13 and 2841.24 cm -1 is due to C-H stretching. The absorption at 1743.33 cm -1 could be C=O (carbonyl) stretch and 1635.39 cm -1 is due to C=C stretching stretching (Lee et al, 2007 shifted because of the C-H stretching. Absorption peak at 1743.33 cm -1 lost intensity and shifted to 1730 cm -1 due to C=O lead absorption.…”
Section: Ftir Analysismentioning
confidence: 99%
“…The band at 2918.18 and 2853.36 cm -1 is due to C-H stretching. The absorption at 1743.18 cm -1 could be C=O (carbonyl) stretch and 1635.79 cm -1 is due to C=C stretching (Lee et al, 2007). The adsorption peaks at 1246.00 and 1017.90 cm -1 can be assigned to C-O group of an acid and an ester, respectively (Sharma and Uma Gode, 2010 .…”
Section: Ftir Analysismentioning
confidence: 99%
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