In this work for the first time, green technique-solvent free synthesis Dual metallic Zeolitic imidazolate frameworks (ZIF-2M) consisting of cobalt and zinc metals (ZIF-2M) at room temperature was performed. The synthesized compound was used as an efficient adsorbent for the adsorption of chlorpyrifos. The presence of second metal led to the improving in both chemical as well as physical properties such as crystal structure, porosity, specific area and magnetic property together keeping basic structure of ZIFs. In order to comparison ZIF-2M with ZIF-8 both of them were applied for removal of chlorpyrifos in aqueous solution. Comparison of removal efficiency was investigated for both nanoparticles under optimized conditions. The main factors which can potentially effect on the adsorption process are dosage of adsorbent, pH and contact time. Those factors were considered in statistical studies. The optimum conditions were achieved by BOX-Behnken design(BBD). Results revealed that the removal efficiency of ZIF-2M (97%) is more than that of ZIF-8 (90%). Also, Langmuir and Freundlich isotherms for chlorpyrifos sorption by ZIF-2M in optimal conditions were studied and discussed.
