Abstract
Background.Sawdust from Parkia biglobosa was prepared as an adsorbent for the adsorption of dye from aqueous solution.Objectives.The ability of sawdust to adsorb Congo red in a single dye system and binary dye system was examined.Methods.Effects of several variables (pH, contact time, initial dye concentration and adsorbent dose) were investigated and optimum conditions were established. The equilibrium data were subjected to kinetic and isotherm models.Results.Equilibrium time was observed at 600 mins while the optimum dose was 0.2 g and there was an increase in adsorption at low pH. The equilibrium data fitted the Freundlich isotherm model in both systems (coefficient correlation (R2) > 0.9). Harkin-Jura was the worst-fitted (R2 < 0.8). The qm in the single system (21.65) was lower than in BDS (27.17; 34.01). The values of 1/n show the heterogeneity on the surface of sawdust which reduced in the BDS. The increase in qm in the binary system showed that the presence of another dye (Reactive black 5) had a synergistic effect on the adsorption of Congo red. The kinetics of the process followed the pseudo-second-order model both in the single system and one of the binary systems. The dynamics of the process showed that the single system was non-spontaneous at low temperatures, endothermic and increased randomness on the surface of the adsorbent, while in the binary system, the process was exothermic and had little affinity for the adsorbent.Conclusions.Sawdust from Parkia biglobosa is a potential adsorbent for removing Congo red dye from aqueous solution in single and binary systems.Competing Interests.The authors declare no competing financial interests.
Highlights
There is growing concern about widespread contamination of surface and ground water by various organic compounds due to the rapid development of chemical and petrochemical industries over the past several decades
The present study aims to examine removal of Congo red from aqueous solution using adsorbent prepared from sawdust of Parkia biglobosa in aqueous solution
Effect of pH on the adsorption of Congo red Various pH values of Congo red solution was prepared to study the adsorption of Congo red on sawdust by adding appropriate amounts of 0.1 M hydrogen chloride (HCl) or 0.1 M NaOH
Summary
There is growing concern about widespread contamination of surface and ground water by various organic compounds due to the rapid development of chemical and petrochemical industries over the past several decades. The increase in qm in the binary system showed that the presence of another dye (Reactive black 5) had a synergistic effect on the adsorption of Congo red. Sawdust from Parkia biglobosa is a potential adsorbent for removing Congo red dye from aqueous solution in single and binary systems. Accepted June 2, 2021 J Health Pollution 31: (210912) 2021 © Pure Earth after being used.[3] Congo red (sodium salt of benzidine diazobis-1-naphthylamine-4-sulfonic acid) is a benzidinebased azo dye (an acid dye), a model anionic dye that has a complex chemical structure, high solubility in aqueous solution and difficult to biodegrade or photodegrade because of its stable structure.[4] The dye is known to be metabolized into benzidine, which is a human carcinogen and mutagen.[5] it is necessary to remove it from bodies of water
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