Adsorptive Detoxification of Congo Red and Brilliant Green Dyes Using Chemically Processed Brassica Oleracea Biowaste from Waste Water

Abstract

Water pollution being a potential risk to mankind is treated in several ways which includes chemical treatments. Among them, adsorption took a prominent position for the removal of many hazardous dyes from waste water. Here in this study, an environment-friendly, inexpensive, and broadly available leaves of Brassica oleracea were utilized for adsorption of two carcinogenic dyes, i.e., Congo red and brilliant green. The adsorbent Brassica oleracea leaves were collected, dried, and characterized by FTIR and SEM and then utilized in batch manner for dye removal. Isothermal modeling was carried out on data obtained after experiment which show the best fitting of Langmuir with q max 42.553 and 103.093 mg.g-1 for Congo red (CR) and brilliant green (BG), respectively. Consequently, a homogenous, monolayer mode of adsorption was followed. Kinetic modeling supported pseudosecond order and Elovich model in most suitable manner. It was also found that a spontaneous, exothermic process provided by the values of thermodynamic parameters ( ∆ G ° , ∆ H ° , and ∆ S ° ) was calculated.

Design and Preparation of Magnetically-Oriented Poly(styr-co-MMA)-3MPS Capped Fe(ZnO) Hybrid Microspheres for Ion Exchange Removal of Toxic Pollutants from Wastewater

“…The high sorption capacities at less contact time are due to the large number of vacant sites available on the surface of the adsorbent. The graph becomes linear as the time increases due to the non-availability of vacant spaces and the repulsive forces operates for the upcoming ions by the already entrapped Cr(III)/fluorescein ions [18]. also been observed that when contact times were further increased for Cr(III) and fluorescence, the adsorption capacities decreased and finally became constant.…”

“…The influence of temperature changes on the batch ion exchange sorption of Cr(III) and fluorescein with anionic MFZPI and cationic SMFZPI adsorbents were studied in the temperature range of 293-333 K. All the experiments were done in replicates at an agitation speed of 250 rpm, the solutions were filtered, and the filtrates were investigated by atomic absorption spectroscopy (AAS) for Cr(III) sorption and visible spectrophotometer for fluorescein removal. The maximum sorption (q e , mg/g) and removal percentage (R%) of Cr(III) and fluorescein by MFZPI and SMFZPI were estimated with the following equations [18] (Equations ( 1) and ( 2)).…”

“…The kinetics of the synthesized ion exchange adsorbents was studied against Cr(III) and fluorescein using Elovich, pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. The following linear equations were used to determine the sorption rates with respect to the time (Equations ( 3)-( 6)) [18].…”

“…where, ∆G • = Gibb's free energy, its negative value represents reaction spontaneity, and positive ∆G • represents non-spontaneous sorption, ∆H • = enthalpy that signifies the exothermic (negative ∆H • ) and endothermic (positive ∆H • ) nature of the sorption, ∆S • = entropy which explains the randomness at the sorption interface. Moreover, negative ∆S • represents decreased entropy, and positive ∆S • gives the structure changes in the sorbent with increased entropy [18].…”

Interlayer Modification of West Java Natural Bentonite as Hazardous Dye Rhodamine B Adsorption

“…The role of pHpzc is to determine the influence of pH range on the active site of the surface adsorbent. The value of pH > pHpzc induces optimum adsorption of cationic dyes due to negative charge increases on adsorbent (Kanwal et al, 2022) . RhB has a positive charge in the solvent, then tends to adsorb at a higher pH value than the pHpzc condition (Ribeiro dos Santos et al, 2019) .…”