Removal of Congo red dye from aqueous solutions by a low-cost adsorbent: activated carbon prepared from Aloe vera leaves shell

Abstract

Background: Synthetic dyes have several harmful effects on human health as well as aquatic life. In this study, activated carbon (AV-AC), based on Aloe vera leaf shells, was used as a novel agricultural adsorbent, one that is low-cost and available for the removal of Congo red (CR) as a carcinogenic dye from aqueous solutions. Methods: In the batch system, the influence of different parameters like contact time, pH, adsorbent dosage, and initial CR concentration were examined on the dye removal from liquid medium. The experimental data were fitted by pseudo-first-order and pseudo-second-order kinetics, and also Langmuir and Freundlich isotherms models. Results: The optimum contact time and pH for the uptake of CR were obtained at 20 minutes and acidic pH of 2. The maximum uptake capacity of CR dye by AV-AC was 1850 mg/g. The results showed that the experimental data were well-fitted by the pseudo-second-order kinetic model (R 2 > 0.99) and Freundlich isotherm model (R 2 > 0.99). Conclusion: According to the results of our study, the AV-AC is a low-cost, non-toxic, and effective adsorbent for the uptake of CR dye from aqueous media.

Kinetics and thermodymics studies for the removal of bromocresol purple using raw bentonite clay and activated carbon from <i>Vachellia nilotica</i> pod as adsorbents

“…This can be attributed to availability of more binding site as the dose of raw bentonite clay increases. This is in consistence with the results obtained by Omidi-Khaniabadi et al, (2017). However, for activated carbon AVNP percentage removal of the dyes decreases with increase in adsorbent dosage from 0.1 to 3g.…”

Synthetic and application of a novel resin from waste foam packing for adsorption of Acid Orange 67 from aqueous solution

“…The rate of removal of the dye is higher in the beginning due to the large surface area of the adsorbent available for the adsorption of dye ions. After a certain period, only a very low increase in the dye uptake was observed because there are few active sites on the surface of the adsorbent (Khaniabadi et al 2017). From the contact time studied, it was revealed that 80 min of agitation time is enough to reach equilibrium when 100 mg/L of dyes concentration was employed.…”

Functionalized Leather: A Novel and Effective Hazardous Solid Waste Adsorbent for the Removal of the Diazo Dye Congo Red from Aqueous Solution

“…However, adsorption method has proven to be a promising method due to its efficiency, relatively low cost, reusability, and easy operation [9,18]. Congo red adsorption has been reported with adsorbents such as activated carbon with a removal efficiency of about 100% [19], activated carbon prepared from Aloe Vera leaves with a performance of almost 100% [20], jujuba seeds with a dye removal of 88% [21], roots of Eichhornia crassipes with 96% [22], and montmorillonite clay with 85% [23]. The use of solid waste as an adsorbent material has been extensively studied, however, such hazardous waste materials as leather have rarely been applied to this purpose.…”