Application of Response Surface Methodology and Desirability Function in the Optimization of Adsorptive Remediation of Arsenic from Acid Mine Drainage Using Magnetic Nanocomposite: Equilibrium Studies and Application to Real Samples

Abstract

A magnetic multi-walled carbon nanotube/zeolite nanocomposite was applied for the adsorption and removal of arsenic ions in simulated and real acid mine drainage samples. The adsorption mechanism was investigated using two-parameter (Langmuir, Freundlich, Temkin) and three-parameter (Redlich–Peterson, and Sips) isotherm models. This was done in order to determine the characteristic parameters of the adsorptive removal process. The results showed that the removal process was described by both mono- and multilayer adsorptions. Adsorption studies demonstrated that a multi-walled carbon nanotube/zeolite nanocomposite could efficiently remove arsenic in simulated samples within 35 min. Based on the Langmuir isotherm, the adsorption capacity for arsenic was found to be 28 mg g−1. The nanocomposite was easily separated from the sample solution using an external magnet and the regeneration was achieved by washing the adsorbent with 0.05 mol L−1 hydrochloric acid solution. Moreover, the nanoadsorbent was reusable for at least 10 cycles of adsorption-desorption with no significant decrease in the adsorption capacity. The nanoadsorbent was also used for the arsenic removal from acid mine drainage. Overall, the adsorbent displayed excellent reusability and stability; thus, they are promising nanoadsorbents for the removal of arsenic from acid mine drainage.

Exploration of a Molecularly Imprinted Polymer (MIPs) as an Adsorbent for the Enrichment of Trenbolone in Water

“…The adsorption data obtained for trenbolone adsorption onto the MIP were shown to fit the Langmuir isotherm with a correlation coefficient of 0.9263, which was greater than the R 2 of 0.8100 for the Freundlich isotherm. This meant that the adsorption of trenbolone onto the MIP was homogenous and thus assumed monolayer adsorption [65][66][67]. The maximum adsorption capacity calculated using the Langmuir isotherm was found to be 27.5 mg g −1 .…”

Experimental and Modeling Process Optimization of Lead Adsorption on Magnetite Nanoparticles via Isothermal, Kinetics, and Thermodynamic Studies

“…fabricated spinel type lithium manganese oxide adsorbents for the removal of lithium ions . Similarly, Gugushe et al have synthesized a multiwalled carbon nanotube/zeolite magnetic nanocomposite for the extraction of arsenic ions from real acid mine drainage . However, magnetite nanoparticles are a viable approach as they are super paramagnetic and hydrophilic and possess high surface area .…”

“…15 Similarly, Gugushe et al have synthesized a multiwalled carbon nanotube/zeolite magnetic nanocomposite for the extraction of arsenic ions from real acid mine drainage. 16 However, magnetite nanoparticles are a viable approach as they are super paramagnetic and hydrophilic and possess high surface area. 17 Magnetic magnetite (Fe 3 O 4 ) nanoparticles are paving a path for revolutionizing nanotechnology by their influencing properties such as reduced imperfections, high number of surface atoms, and high surface energy and spatial confinement.…”

Optimization of Membrane Electrode Assembly of PEM Fuel Cell by Response Surface Method

“…It is extensively used in the industrial world, particularly in situations where the output is swayed by several input parameters. This method has been widely used in different fields and applications such as metals removal [26], chemical extraction [27,28], and the chemical and environmental engineering field [29,30,31]. As compared to other methods, RSM being a collection of mathematical and statistical techniques, gives a better understanding into the role of different parameters at play and generates a continuous model for visualizing the effect of parameters on the entire range as opposed to the average value of the response [32].…”