Optimization of Adsorption Parameters for Removal of Carbaryl Insecticide Using Neem Bark Dust by Response Surface Methodology

Abstract

Adsorptive removal of carbaryl from aqueous solutions by neem bark dust (NBD) was investigated in a batch method under laboratory conditions. At first, the effects of particle size, stirring rate, and contact time on the adsorption process were studied. The optimum value of particle size, stirring rate, and contact time were 200 μm, 250 rpm, and 25 min, respectively. Subsequently, response surface methodology (RSM) was applied to investigate the effects of other operating parameters such as solution pH (2-10), adsorbent dose (0.01-1 g), and initial concentration (5-20 ppm). The optimization of the process parameters and calculation of the effects and interactions of process variables were done by using Box-Behnken design (BBD) which is a subset of RSM. The independent variables were precisely optimized by making use of an objective function called Bdesirability function.^Based on the adsorption capacity and economical use of adsorbent, the input parameters were optimized by setting two different sets of criteria (I and II). The desirability of two different sets were 1.00 and 0.822, respectively, which explains that the estimated function can well represent the experimental model. The optimized result revealed that the NBD can be an effective adsorbent for the removal of carbaryl from an aqueous system. The adsorption of carbaryl on NBD was best analyzed with the Langmuir isotherm and the pseudo-second order kinetic model. From the kinetic study, the maximum adsorption capacity was found to be 142.85 mg g −1 . Thermodynamic data confirmed the feasibility and spontaneous nature of the adsorption process.

Glyphosate adsorption by Eucalyptus camaldulensis bark-mediated char and optimization through response surface modeling

“…1 FTIR study increase in adsorption occurs. This can be explained by the fact that at the higher dose, some of the active sites overlapped, thus reducing the adsorption performance (Malik et al 2007;Chattoraj et al 2016).…”

“…Kinetic models are used to describe the adsorption mechanism, which is associated with the adsorption rate by pseudo-first-order (Lagergren 1898) and pseudosecond-order kinetics (Ho and McKay 1999), are shown in Table 3. The linear equation is given in Table 3 and calculated by Chattoraj et al (2016). All kinetic data are presented in Table 3.…”

“…The operating variables were assessed by analysis of variance (ANOVA), and various variables can be understood from the 3D surface plot. The model performance is assessed based on the F value (Chattoraj et al 2016;Sen et al 2017;Mondal et al 2019a).…”

Polymer sequestrants for biological and environmental applications

“…Carbaryl (1‐naphthylmethyl carbamate) is one of the most widely used agricultural pesticides and is often detected in groundwater . A number of adsorption methods have been investigated including the use of biomass and graphene‐modified TiO 2 nanotubes .…”

Removal and Recovery of Hazardous Metal Ions from the Industrial Effluent using Waste Fish Scale Impregnated Polyurethane Foam: Voltametric Method

“…The metal ions adsorbed fish scale impregnated on polyurethane foam separated from the adsorption process was then filled in the separation column and then the metal ions were stripped back using 10 ml 1M HCl at 1 ml per minute flow rate. The concentration of stripped metals was also checked for verification of adsorption efficiency [27][28][29] .…”