Removal of chromium from contaminated liquid effluents using natural brushite obtained from bovine bone

Abstract

a b s t r a c tNatural brushite (nDCPD) obtained from bovine bone was used to remove Cr(III) from aqueous solutions. Cr(III) adsorption was performed, varying adsorbent concentration and contact time in solution. The kinetic study of Cr(III) adsorption was performed with the kinetic models of pseudo-first order and pseudo-second order, Elovich, intraparticle and external diffusions. The experimental data were examined with the Langmuir, Freundlich, Redlich-Peterson (R-P), SIPS and Temkin isothermal models. The surface of the adsorbent was characterized by various techniques. The results show that most of the kinetic adsorption data were well described by the pseudo-first-order model, the equilibrium data were best fitted to the SIPS and Langmuir models, with adsorption capacity of 43.378 and 50.767 mg/g, respectively. The equilibrium time of the system was set at 10 h. A 95% Cr(III) removal rate was achieved. The calculated thermodynamic parameters show that Cr(III) adsorption is carried out spontaneously on the surface of nDCPD, although it is positively charged, indicating that nDCPD can be a low cost and easy to obtain effective adsorbent for the removal of Cr(III) from aqueous solutions.

Current Development of Sorbents Derived From Plant and Animal Waste as Green Solution for Treating Polluted Aqueous Media

“…By having excellent surface area 3231.8 m 2 /, it confirmed a great adsorption capacity of the sorbent regarding the eradication of antibiotics pollutants namely sulfamethazine and chloramphenicol by around 1194 mg/g and 1240 mg/g, respectively [39]. Thus the brushite sorbent derived from bovine bone which was used to separate Cr(III) metal ions from aqueous solutions could reach up to 95% of pollutant removal [86]. All those reports agreed with the potentiality of bovine bone as an alternative option for greener sorbent.…”

Cr(III) removal from tannery effluents using silica obtained from rice husk and modified silica

“…9, where C 0 is the initial concentration in mg L -1 and K L is the Langmuir constant. The value of R L lies between 0 and 1 indicating that the adsorption is favorable, while R L greater than 1 represents unfavorable adsorption and R L = 1 represents linear adsorption, while the adsorption process is irreversible if R L = 0 [36]. Fig.…”

3,5-Dinitrosalicylic Acid Adsorption Using Granulated and Powdered Activated Carbons

“…From these data, it can be observed that for both samples the process is spontaneous (∆G < 0) and that the Gibbs free energy increases with increasing temperature; this change is more noticeable for the GAC adsorbent while for PAC the increase is gradual. DNS adsorption has an endothermic nature (∆H > 0), which indicates that as the temperature increases, the adsorption capacity of GAC and PAC increases, which suggests that the electrostatic forces that are established on the surface of the adsorbent intervene significantly in the process [21]; on the other hand, with the change in entropy (∆S > 0) the randomness in the solid-fluid interface increases during the adsorption process, which is expected behavior for adsorption processes in the liquid phase [12,14,25,26,38].…”

“…This study showed that one of the causes for which there is a greater adsorption capacity and percentage of removal of DNS is the use of powdered AC, since it only depends on the participation of the functional groups that are found on the surface; conversely, for Figure 5 is constructed by comparing q vs t 0.5 , which refers to the intraparticle mass transfer model [14,28]. In Figure 5a, only two stages can be seen: external diffusion and equilibrium, since the intraparticle diffusion stage is not clearly observed [22,27,28,36].…”

“…reverse osmosis [1], photodegradation [11], ultrafiltration [1], sedimentation [5], ozonization [12] and ion exchange [13,14]. Another treatment alternative for the adsorption of pollutants is the use of activated carbon (AC), which has shown stability and high adsorption capacity, easy handling, low energy consumption, and versatility, and they do not form reaction by-products [1,15,16].…”