Cadmium Adsorption Kinetic Study Using Natural Brasgel Clay the Adsorbent

Abstract

Heavy industrial activities result in contamination of waste water with many heavy metals, including cadmium, nickel, lead, mercury. Within this context becomes a growing concern of the population and environmental agencies regarding water contamination by heavy metals from industrial effluents. Because of this problem, this paper aims to study and evaluate the main properties of natural Brasgel clay in order to remove cadmium from synthetic effluents, analyzing its kinetic adsorption and its isothermal balance. Once clays exhibit good cation exchange capacity, selectivity and regenerability and for this reason has aroused interest in the use as an adsorbent. As finite bath testing we found that the Brasgel clay, removed approximately 90% of cadmium. The Langmuir model presented best fit to the experimental data, adequately describing the dynamics of adsorption. Kinetic tests indicated that the cadmium removal process by natural Brasgel clay apply the mechanism of the pseudo-second-order rate model, a time of 20 minutes and required to reach equilibrium. Thus, the results indicated that Brasgel clay can be used as an adsorbent for the removal of cadmium from contaminated effluent.

Removal of Pb2+ and Zn2+ using modified Chocolate B clay: a study using statistical analysis, equilibrium isotherms, and adsorption kinetics

“…Based on the removal of heavy metals, the Chocolate B clay was efficient, with values of q eq of 3.36 mg.g -1 for Pb 2+ and 3.72 mg.g -1 for Zn 2+ . Similar results were found elsewhere [35,50,[75][76][77]. Although traditional adsorbents such as zeolites and activated carbon present higher q eq values, we can affirm that Chocolate B clay has a reasonable adsorption capacity.…”

Ciência e tecnologia: eixos do desenvolvimento

“…Some of these studies were conducted with clay minerals from the state of Paraiba. This region presents a diversity of these clay minerals with prov-en capability to remove lead, Zinc and Cadmium (Silva et al, 2009;Rodrigues et al, 2004;Mota et al, 2014;Silva et al, 2015;Souza et al, 2014;Mota et al, 2018;Cunha et al, 2014;Mota et al, 2020) all with more than 80% efficiency.…”

Expansibility of vermiculite (Santa Luzia, Brazil) irradiated with microwave

“…When using the chemical microwave method, the pressure of oxygen and water between layers leads to increased expanded times [26]. The LABNOV (New Materials Development Laboratory, UFCG, Brazil) research group has worked on the thermal treatment on clays with success [27][28][29][30][31][32][33][34][35]. As can be observed, there is a lack of studies in the literature regarding natural vermiculite clay being modified through microwave thermal expansion.…”