▎ 摘　　要

Organophosphorus compounds are those compounds which are widely used as pesticide or insecticide. But, these compounds have serious harmful effects if these compounds may enter in food chain via biomagnifications process. Therefore, different research groups have been working on modalities for removal of these toxic compounds from the environment. The current study investigates the potential of adsorption capacity of synthesized reduced graphene oxide for phosmet, which is a toxic organophosphorus compound. Reduced graphene oxide (rGO) was synthesized in high yield (88 %) using L-ascorbic acid as a reducing agent and further, it was characterized using UV-Vis, FT-IR, powder-XRD, Raman, FE-SEM, BET, and TGA techniques. The surface area of synthesized rGO was determined to be 334 m2/g using the BET technique. The adsorption study showed the uptake capacity of rGO for phosmet was found to be dependent on rGO dose, pH effect, contact time, and temperature effect. The highest adsorption capacity (2680 mg/g) and removal efficiency (96 %) were obtained at pH 6.8. The kinetic data were best described by pseudo-second-order model, suggesting that the adsorption of phosmet on rGO surface is chemisorptions type. The equilibrium adsorption studies were best fitted with Langmuir isotherm model; thus, confirming the homogeneous adsorption of phosmet on rGO surface. The temperature-dependent adsorption of phosmet on rGO investigation suggested that adsorption was enthalpy driven (Delta H0 = -150 kJ mol- 1) and spontaneous (Delta G0 = -10.6 kJ mol- 1) in nature. The adsorbent reusability was examined, and it was found that after 5 cycles, there was a little loss (19 %) in the adsorption efficacy of rGO for phosmet with no significant change in surface morphology. The current investigation reveals the synthesized adsorbent has a great potential for the removal of phosmet.