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Role of cationic surfactant in the removal of chromium(VI) by sodium borohydride.

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Title: Role of cationic surfactant in the removal of chromium(VI) by sodium borohydride.
Authors: Sashanan Al‐Zahrani, Fatima M.1 (AUTHOR), Albukhari, Soha M.1 (AUTHOR), Zaheer, Zoya1 (AUTHOR) zoya.zaheer@gmail.com
Source: Canadian Journal of Chemical Engineering. Jun2026, Vol. 104 Issue 6, p3228-3238. 11p.
Subjects: Cetyltrimethylammonium bromide, Sodium borohydride, Water pollution remediation, Activation energy, Chromium removal (Sewage purification), Complex ions, Chemical decomposition, Cationic surfactants
Abstract: Sodium borohydride (NaBH4) is one of the most effective reductants for chromium(VI), a severely toxic natural water and soil contaminant. Spectroscopic investigations of oxidative degradation of potassium dichromate (Cr(VI)) by NaBH4 have been studied in aqueous media. At lower concentrations of oxidant, researchers observed the formation of a coordination complex between chitosan, Cr(VI), and borohydride (BH4−) prior to the rate‐determining step. Removal efficiency decreases from 87.1% to 17.5% with increasing the pH from 3.0 to 8.0 of the reaction mixtures. Activation parameters (activation energy = 59.5 kJ/mol, enthalpy of activation = 57.2 kJ/mol and entropy of activation = −67.8 JK−1 mol−1) were determined for Cr(VI) removal and compared with the literature values. Post‐micellar effect was negligible due to the strong coordination between the cetyltrimethylammonium bromide (CTAB) aggregates and reactants. CTAB is an effective inhibitor (removal efficiency decreases sharply from 80.2% to 18.1% with CTAB concentration, from 0.0 to 3.0 mM) and environmentally friendly, and this research showed that the use of CTAB can be a promising approach for the inhibition of the fast removal of water contaminants and resistant compounds. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Sodium borohydride (NaBH4) is one of the most effective reductants for chromium(VI), a severely toxic natural water and soil contaminant. Spectroscopic investigations of oxidative degradation of potassium dichromate (Cr(VI)) by NaBH4 have been studied in aqueous media. At lower concentrations of oxidant, researchers observed the formation of a coordination complex between chitosan, Cr(VI), and borohydride (BH4−) prior to the rate‐determining step. Removal efficiency decreases from 87.1% to 17.5% with increasing the pH from 3.0 to 8.0 of the reaction mixtures. Activation parameters (activation energy = 59.5 kJ/mol, enthalpy of activation = 57.2 kJ/mol and entropy of activation = −67.8 JK−1 mol−1) were determined for Cr(VI) removal and compared with the literature values. Post‐micellar effect was negligible due to the strong coordination between the cetyltrimethylammonium bromide (CTAB) aggregates and reactants. CTAB is an effective inhibitor (removal efficiency decreases sharply from 80.2% to 18.1% with CTAB concentration, from 0.0 to 3.0 mM) and environmentally friendly, and this research showed that the use of CTAB can be a promising approach for the inhibition of the fast removal of water contaminants and resistant compounds. [ABSTRACT FROM AUTHOR]
ISSN:00084034
DOI:10.1002/cjce.70190