Modified Nigella Sativa Seeds as a Novel Efficient Natural Adsorbent for Removal of Methylene Blue Dye

Abstract

The aim of this work was to investigate the use of modified nigella sativa seeds (MNS) for removing of methylene blue (MB) dye from aqueous solution. The nigella sativa (NS) seeds have been pre-treated at different temperatures and periods of time. The maximum adsorption of MB was achieved using NS sample washed with distilled water pre-heated at 65 °C for one hour, then ground to 250 µm particle size (MNS-4). Different parameters were modified to optimize the removal process of MB using MNS-4, such as contact times, temperatures, initial dye concentrations, adsorbent doses, and pH of the solution. MNS-4 exhibited a removal efficiency of 99% for initial dye concentrations greater than 800 ppm at pH value of 11. The kinetic study indicated that the removal process follows the pseudo second order model. The removal was spontaneous, endothermic and favorable, and this was indicated by the thermodynamic study. Maximum removal capacity was 194 mg/g as deduced from Langmuir model. The removal efficiency was maintained after four recycle uses. The modified nigella sativa seeds were characterized before, and after adsorption and regeneration by Fourier Transform infrared (FTIR) and scanning electron microscopy (SEM). The data suggested that nigella sativa seeds could be a prospective agent for removing MB from wastewater.

Molybdenum Trioxide: Efficient Nanosorbent for Removal of Methylene Blue Dye from Aqueous Solutions

“…The removal of MB was carried out by batch adsorption experiments [ 68 ]. The removal of MB by α-MoO 3 was carried out by stirring specific amount of adsorbent into 100 mL of MB solution of known concentrations at specific temperature (T = 25, 50 and 70 °C) and at different contact times (10, 30, 60, 90 and 120 min).…”

Optimization of process parameters for methylene blue removal by jute stick using response surface methodology

“…Among all available methods, adsorption is most accepted and widely explored. Though activated carbon is a very good adsorbent, but owing to high cost of production, researchers have explored various locally available natural resources like rice husk , saw dust of oak , jute processing waste , peel of banana and orange , wheat shells , untreated beech sawdust , coir pith carbon , papaya leaf powder , carrot stem powder , cashew nut shell , Annona squmosa seed , tobacco stem biomass , rice husk activated carbon , Cupressus sempervirens cones , pine cone biomass , water hyacinth , tea waste , biomass flyash , palmarosa wastes based alginate beads , Nigella sativa seeds , etc. In present study, jute ( Corchorus olitorius ) stick (JS) stick have been used as a novel adsorbent to remove a cationic dye, methylene blue (MB) from aqueous solution.…”

Highly Efficient Methylene Blue Dye Removal by Nickel Molybdate Nanosorbent

“…Regeneration techniques suggested in the literature include chemical extraction, thermal treatment, supercritical regeneration, microwave irradiation, bio-regeneration, etc. [ 25 , 88 , 93 , 94 , 95 ]. The thermal regeneration, which has been applied for molybdenum oxide nanosorbent, was described in our previously published work [ 88 ].…”

“…Adsorption application is extensively employed due to its ease of process and guarantee of superb minimal cost from among those above-mentioned methods [ 1 , 16 , 17 , 18 , 19 , 20 , 21 ]. Several natural adsorbents have been successful in the elimination of color from aqueous waste matter [ 22 , 23 , 24 , 25 ]. A universally used example is activated carbon owing to the presence of its large surface area [ 26 , 27 ].…”