Adsorption of Congo red from aqueous solution onto shrimp shell powder

Abstract

Two novel adsorbents derived from shrimp shell were prepared and their adsorption performances on Congo red were investigated. The results suggested that treated shrimp shell powder exhibited a higher adsorption capacity than raw shrimp shell powder. The factors of initial concentration, solution pH, adsorption time, and temperature were investigated. The maximum adsorption capacity of treated shrimp shell powder calculated according to the Langmuir isotherm model was 288.2 mg/g, which is much higher than that of chitin. The adsorption behavior could be fitted well by the pseudo-second-order kinetic model. Intra-particle diffusion model was also used to study the adsorption process. The thermodynamic parameters indicated the spontaneous and endothermic nature of the adsorption. Shrimp shell powder exhibited enough advantages such as large adsorption capacity, low cost, simple processing methods and high specific gravity compared with chitin or chitosan. This work confirmed that the shrimp shell biosorbent had a potential to be applied in dye wastewater treatment area.

Kinetics, Isotherm, Thermodynamics, and Recyclability of Exfoliated Graphene-Decorated MnFe2O4 Nanocomposite Towards Congo Red Dye

“…A positive ∆H reveals that the adsorption process of CR onto EG@ MnFe 2 O 4 tends to be endothermic. ese results were highly in line with many previous works studying the adsorption of CR over various porous materials [73][74][75][76][77]. Meanwhile, positive value of ∆S shows an increase in disorder levels occurring in heterogeneous phase because of migration between aqueous solution and CR molecules during sorption [78].…”

Removal of Patent Blue (V) Dye Using Indian Bael Shell Biochar: Characterization, Application and Kinetic Studies

“…The plot of t/q t versus t gives a linear relationship, which allows the calculation of k 2 and q e . Here, it should be noted that the model with a higher regression coefficient (R 2 ) and agreement between the experimental and calculated value of q e is utilized as the appropriate model for supporting the adsorption kinetics [34].…”

“…The decrease in PB (V) removal upon an increase in pH might be due to competitive adsorption between the hydroxyl ions (OH-) present in the solution and the anionic portions of the PB (V) dye. On the other hand, interference by OH-ions was limited at lower pH values, thus facilitating the attraction of PB anions on a positively charged BSB surface [34,37].…”

Comparative investigation of indigo blue dye removal efficiency of activated carbon and natural clay in adsorption/ultrafiltration system

“…The observed behaviour can be attributed to the availability of more active sites on the adsorbent surface for occupations of dye molecules. The dramatic increase of color removal, from 0-75% for AC and from 0-90% for NC, can be attributed to the increase of the surface area and availability of additional adsorption sites at increasing amount of adsorbent [52]. It is noteworthy to mention that the rate of dye removal increased very slow after the dose of 0.4 g/L for NC and 0.3 g/L for AC.…”