Adsorption and Reduction of Heavy Metal Cr (VI) by Enterobacter cloacae SKD and Its Kinetics

Abstract

Chromium contamination is one of the most common heavy metal pollutants. Degradation of highly toxic Cr(VI) by microbial remediation technology can open up a new way for environmentally friendly and efficient chromium pollution control. The adsorption and reduction kinetics of Cr(VI) by Enterobacter cloacae SKD were studied by the adsorption and reduction experiments of Cr(VI) by Enterobacter cloacae SKD. The mechanism of adsorption and reduction of Cr(VI) by Enterobacter cloacae SKD was revealed, and the characteristics of adsorption and reduction were determined. The results showed that the R2 value of the Langmuir model of chromium adsorption by Enterobacter cloacae SKD was 0.989, which was higher than the R2 value of the Freundlich model of 0.656, and the adsorption isotherm model was more consistent with the Langmuir model. Enterobacter cloacae SKD conformed to the second-order adsorption kinetic model, which indicated that the adsorption of Cr(VI) by Enterobacter cloacae was mainly chemical adsorption. The reduction kinetics of Cr(VI) is more in line with the second-order kinetic model. Through the study of the heavy metal chromium adsorption reduction mechanism, the theoretical basis was provided for the practical application of the late heavy metal chromium pollution organism restoration.