Optimization of polyvinylamine-modified nanocellulose for chlorpyrifos adsorption by central composite design.

Developing an efficient adsorption material is of great significance for application in wastewater contaminated with pesticides. The present study investigated a promising nanomaterial (PhaCNCs) prepared with nanocellulose by grafting polyvinylamine for adsorption chlorpyrifos (CP). Structures and characteristics of PhaCNCs were analyzed using scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET). Central composite design based on response surface methodology was used to optimize adsorption process of CP by PhaCNCs. The optimum chemometric showed that 0.57 g L-1 PhaCNCs adsorbed 36.81 mg L-1 CP to yield an efficiency of 92.72 %. The results indicated that the adsorption process was well-described by the pseudo-second-order model. Langmuir isotherm calculated the maximum adsorption capacity for CP of 98.116 mg g-1, implied that the adsorption capacity of PhaCNCs was significantly higher than other adsorbents. This study will contribute to the development of adsorption processes for CP removal from aqueous environments.