Adsorption of Malathion Onto Copper and Iron Surfaces Relevant to Water Infrastructure

Abstract

This study investigated the adsorption of malathion to copper and iron surfaces including microspheres and pipe specimens similar to those in drinking water infrastructure. The solid phase concentration of malathion on the virgin and used copper pipe specimens was generally between 0.2-1 mg/g. The adsorption capacity for copper and iron microspheres were greater than those of the pipe specimens because of their higher surface area-to-volume ratios. Copper materials adsorbed more malathion than comparable iron materials. XPS analysis of copper and iron surfaces revealed peaks at 164 eV (S 2p) and 135 eV (P 2p), which suggests that malathion chemically bonded to the surfaces of the specimens. Metal oxides likely formed stable bonds with phosphorus through pi conjugation. These findings are the first to show that malathion can chemically adhere to copper and iron pipe materials. This insight is critical for understanding the decontamination strategies needed for water networks.

Asam Posfat (H3PO4): Ionic Transformation of Phosphoric Acid in Aqueous Solution

“…Ukuran pori dan adanya hubungan antar pori-pori tersebut sangat menentukan apakah tanah mempunyai permeabilitas rendah atau tinggi (170)(171)(172)(173)(174)(175)(176)(177)(178)(179)(180)(181)(182)(183)(184)(185). Air dapat mengalir dengan mudah di dalam tanah yang mempunyai pori-pori besar dan mempunyai hubungan antar pori yang baik (186)(187)(188)(189)(190).…”

Feasibility Study on the Use of Recycled Polymers for Malathion Adsorption: Isotherms and Kinetic Modeling

“…Mirković et al [19] report the use of mesoporous monetite as efficient adsorbent of malathion from aqueous solutions. Harper Jr. et al [20] demonstrated the feasibility of use of metallic materials such as iron and copper for malathion adsorption, but the adsorption capacity was low compared to the typical adsorbent materials used (activated carbon). Wanjeri et al [21] went a step further and suggested the use of adsorbent materials with nanoparticles: graphene oxide coated with silica nanomagnetic particles was used for the removal of chlorpyrifos, parathion, and malathion.…”