Waste Moringa oleifera seed pods as green sorbent for efficient removal of toxic aquatic pollutants. (1st December 2018)

• Record Type: Journal Article
• Authors: Shirani, Zahra; Santhosh, Chella; Iqbal, Jibran; Bhatnagar, Amit
• Is Part Of: Journal of environmental management. Volume 227(2018)
• Page Start: 95
• Page End: 106
• Publication Date: 2018-12-01
• Subjects: Moringa oleifera -- Dye -- Metal -- Adsorption -- Water treatment; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2018.08.077
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: In the present study, biosorption of chromium (Cr(VI)) ions and Naphthol blue black (NBB) dye using Moringa oleifera seed pods powder (MPP) as green biosorbent was investigated. Three different sizes of MPP viz. fine fraction (<53 μm), coarse fraction (>250 μm) and mixed fraction were investigated. The biosorbent was characterized by pHzpc, Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) in order to get an insight of the surface charge, functional groups, and morphology of the biosorbent, respectively. The biosorption studies were conducted with Cr(VI) and NBB dye and different parameters, such as solution pH, contact time, initial concentration of the pollutant, adsorbent dosage and co-existing ions were examined. Experimental results revealed that the maximum removal of Cr(VI) and NBB dye was observed at pH 1 and 2, respectively and the equilibrium was achieved in ca. 180 min. The removal efficiency of Cr(VI) by fine, mixed and coarse fraction was 91.8, 74.9, 52.6%, respectively, whereas for NBB dye, the removal efficiency for the same fractions was 97.5, 33.6, 18.9%, respectively. The removal efficiency of Cr(VI) and NBB dye was influenced in the presence of competing ions. The biosorption isotherm and kinetic data were best correlated with Langmuir isotherm and pseudo-second order kinetic model, respectively. Column studies were also conducted with MPP by studying different flow rates and adsorbates concentrations to check the practical applicability of MPP in removing target metal and dye pollutants. Highlights: Moringa oleifera pod was used as biosorbent for dye and heavy metal removal. Adsorption of Cr(VI) and Naphthol Blue Black dye via biosorbent is pH dependent. Functional groups have a prominent impact on adsorption of the adsorbates. 2.5 g L −1 of Moringa oleifera pod powder removes up to 99% of Cr(VI) and the dye.