The Use of Rapeseed Husks to Remove Acidic and Basic Dyes from Aquatic Solutions

Abstract

This study aimed to identify the possibility of using rapeseed husks (RH) as an unconventional sorbent for removing acidic (AR18, AY23) and basic (BR46, BV10) dyes from aqueous solutions. Its scope included, i.a.: sorbent characterization (FTIR, pHPZC), determination of pH effect on dye sorption effectiveness (pH 2–11), analysis of dye sorption kinetics (pseudo-first order model, pseudo-second order model, intraparticular diffusion model), and the determination of the maximum sorption capacity (Langmuir 1 and 2, and Freundlich isotherms). The sorption effectiveness of acidic dyes (AR18, AY23) onto RH was the highest at pH = 2, whereas that of the basic dyes BR46 and BV10 was most effective at pH = 6 and pH = 3, respectively. The time needed to reach the sorption equilibrium of dyes onto RH depended on their initial concentration and ranged from 120 to 150 min for the acidic dyes and from 150 to 180 min for the basic dyes. The maximum sorption capacity (Qmax) of RH towards AR18 and AY23 was 49.37 mg/g and 41.52 mg/g, respectively, and towards BR46 and BV10 it was 59.07 mg/g and 20.93 mg/g, respectively. The obtained Qmax values were compared with the results achieved for other sorbents (literature data). This comparison demonstrated that the sorption capacity of rapeseed husks towards the analyzed dyes was higher compared to that of some types of activated carbons.

A Study on the Adsorption of Rhodamine B onto Adsorbents Prepared from Low-Carbon Fossils: Kinetic, Isotherm, and Thermodynamic Analyses

“…The Freundlich isotherm model [ 38 ] refers to multilayer adsorption: where: K F —Freundlich constant (mg/g(L/mg) 1/n ) and 1/ n —constant related to the affinity of the adsorbate for the adsorbent.…”

The Use of Various Types of Waste Paper for the Removal of Anionic and Cationic Dyes from Aqueous Solutions

“…In recent years, great hopes have been fostered in the application of waste materials from the agri-food industry as unconventional sorbents [ 12 ]. The largest group of sorption materials tested so far was lignocellulosic plant biomass [ 13 , 14 ], including stems [ 15 ] and leaves of crops [ 16 , 17 ], seed hulls [ 18 , 19 ], nut shells [ 20 , 21 ], as well as fruit [ 22 , 23 ] and vegetable peels [ 24 , 25 ]. Ample studies have also been carried out on the removal of dyes using waste from the wood industry, such as sawdust [ 26 , 27 ], bark [ 28 , 29 ], cones [ 30 , 31 ], or tree leaves [ 32 , 33 ].…”