Optimization of As(V) Removal by Dried Bacterial Biomass: Nonlinear and Linear Regression Analysis for Isotherm and Kinetic Modelling

Abstract

Arsenic occurrence and toxicity records in various industrial effluents have prompted researchers to find cost-effective, quick, and efficient methods for removing arsenic from the environment. Adsorption of As(V) onto dried bacterial biomass is proposed in the current work, which continues a line of previous research. Dried bacterial biomass of WS3 (DBB) has been examined for its potential to remove As(V) ions from aqueous solutions under various conditions. Under optimal conditions, an initial concentration of 7.5 ppm, pH 7, adsorbent dose of 0.5 mg, and contact period of 8 h at 37 °C results in maximum removal of 94%. Similarly, amine, amide, and hydroxyl groups were shown to contribute to As(V) removal by Fourier transform infrared spectroscopy (FTIR), and the adsorption of As(V) in the cell wall of DBB was verified by FESEM-EDX. In addition, equilibrium adsorption findings were analyzed using nonlinear and linear isotherms and kinetics models. The predicted best-fit model was selected by calculating the coefficient of determination (R2). Adsorption parameters representative of the adsorption of As(V) ions onto DBB at R2 values were found to be more easily attained using the nonlinear Langmuir isotherm model (0.95). Moreover, it was discovered that the nonlinear pseudo-second-order rate model using a nonlinear regression technique better predicted experimental data with R2 than the linear model (0.98). The current study verified the nonlinear approach as a suitable way to forecast the optimal adsorption isotherm and kinetic data.

Removal of Arsenic by Adsorption using Activated Carbon Derived from Zea mays

“…The method of synthesis of carbon and its activation plays a role in the crystallinity. The orthorhombic crystalline peaks that appeared at 2θ 26.61º, 43.45º, 46.32º, 54.81º and 56.68º are relevant to (111), (100), ( 110), ( 222) and (211) planes, respectively [5,6,[12][13][14][15][16].…”

“…More than 100 million people in the world are consuming arseniccontaminated water that contains more than the threshold limit of arsenic. The toxicity of As(III) is 30-70 times more than As(V) as As(III) interacts with thiol (-SH) groups of enzymes and inhibits enzyme action, ATP synthesis with replacement of the phosphate group, gastrointestinal problems, anaemia, skin cancer/skin diseases and neurological defects [6].…”

“…With zinc chloride thermal activation of carbonized sample obtained from the Dialium guineense seed shell has shown an adsorption capacity of 47.08 mg/g [4][5][6]12,13]. Similarly, pristine biochar without and with surface modification using Fe, Fe with Mn have exhibited the adsorption capacity as 1FeC > 1Fe2MnC > PB in pH of 7 at 298 K. In the same manner, good adsorption of arsenic ions has been observed on activated carbon surfaces modified with iron or cerium compounds due to chemi-sorption including physisorption [14].…”

Experimental and Modeling Study on the Removal of Mn, Fe, and Zn from Fiberboard Industrial Wastewater Using Modified Activated Carbon

“…The best-fit model is selected based on the size of the coefficient of determination. The best match is often considered to be the model with the greatest coefficient of determination value (R 2 ) [39]. Additionally, the fit for the removal data is improved by reducing the numerical value of the error functions for a particular model.…”