Adsorption Characteristics of Metronidazole From Industrial Wastewater Onto Polyaniline Nanocomposite

Abstract

Over the past few decades, occurrence of organic micro-pollutants such as pharmaceuticals in the aquatic ecosystems has been considered as a major environmental and health issue globally. Pharmaceuticals have become chemicals of emerging concern to the public because of their potential to reach drinking water. A novel Polyaniline/humic acid (PA/AH) composite was synthesized and investigated for adsorption of Metronidazole antibiotics (MTZ) from aqueous solutions. The nature and morphology of synthesized adsorbent were characterized by scanning electron microscope, Surface adsorption (BET). Batch experiments were performed to study the influence of various experimental parameters such as contact time, initial concentration of the MTZ and temperatures at fixed solution pH and adsorbent dosage. A comparison of kinetic models was evaluated for the pseudo-first-order, pseudo-second-order, Elovich, intraparticle diffusion and Bangham's kinetics models. The experimental data fitted very well the pseudo second-order kinetic model and also followed by intra-particle diffusion model; whereas diffusion is not only the rate-controlling step, and likely that both adsorption steps, bulk and intra-particle diffusion, control the rate of adsorption process. The results show that the sorption capacity increases with increase in solution temperature from 10 to 55 o C. As adsorption capacity of 42.2 to 49.95 mg/g increases when the temperature increases from 10 to 55 o C. The developed polyaniline nanocomposites in this study have considerable potential for the removal of MTZ and could be considered as a promising adsorbent for the removal of other antibiotics also from aqueous solutions.

Extensive sorption of Amoxicillin by highly efficient carbon-based adsorbent from palm kernel: Artificial neural network modeling

“…Among pharmaceutical products, AMX products have had the highest consumption. AMX is a semi-synthetic group of beta-lactam that is used against both gram-negative and gram-positive bacteria in wide range [ 6 , 7 ]. AMX is used as a medicine for human and veterinary applications and should be considered due to its high consumption in the world and Iran as well [ 4 , [8] , [9] , [10] ].…”

“…The release of AMX into the environment can lead to chronic dangers [ [11] , [12] , [13] ]. In order to remove antibiotics from wastewater and water, different methods are used, including advanced oxidation, adsorption, coagulation, flocculation, sedimentation, filtration, membrane processes, biological processes and combination processes [ 5 , 6 , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] ]. Since the removal efficiency is low in biodegradation methods using antibiotics as a toxic substance for purifying organisms.…”