Removal of pentachlorophenol pesticide from aqueous solutions using modified chitosan

Chitosan for direct bioflocculation of wastewater

“…The adsorption efficiency increased with adsorbent concentration up to 0.5 g. Thereafter, increasing adsorbent concentrations did not improve substantially the removal, and nearly 50% removal was reached for dosages between 0.5 and 1.5 g. Yet, the entrapment of a model pesticide was markedly improved, near to 98%, using a nanocomposite form of chitosan-AgO as adsorbent. In another contribution, the removal of pentachlorophenol, a common pesticide, from aqueous solutions, was assessed by comparing chitosan versus the modified chitosan: [chitosan-(2-hydroxy-1-naphthaldehyde)] (Shankar et al 2018). The effect of contact time on pesticide adsorption was studied, based on experiments in batch mode, under stirring, where 0.2 g of adsorbent was added to 200 mL of a synthetic solution containing the pesticide at 150 mg/L.…”

Hybrid Composite Based on Magnetite/ Chitosan for 2,4-D and Chrysoidine Removal

“…The peak at 1601 cm -1 could be based on to the stretching of C-N vibration. The peak at 1651 cm -1 was due to C=O stretching (amide I) and at 1082 cm -1 show C-O stretching [3,[11][12][13]. The bands related to the C-O-C bridge are located at 1151 cm -1 (anti-symmetric stretching of C-O-C bridge), and 897 cm -1 (C-O-C stretching of the glycosidic linkage).…”

“…The chitosan and hybrid composite of magnetite/chitosan have a better ability to remove 2,4-D in solution than bare IONPs, so the functional group on the surface of materials is supposed to be the main cause. The chitosan has a large amount of flexible group on the surface (amino and hydroxyl groups) [11,12] compared with the bare IONPs (have only the hydroxyl groups) [2]; and those amino groups are thought to play an important role in the adsorption mechanism by electrostatic attraction and cation-dipole attraction between the chitosan and 2,4-D molecule [7,11]. Besides, the chitosan and hybrid a)…”

“…Chitosan is also non-toxic, hydrophilic, biocompatible, biodegradable and anti-bacterial, and can be considered as promising cost-effective adsorbents for the removal of hazardous anions in industrial wastewater [9]. Previous studies showed that chitosan acts as efficient adsorption to remove organic pollutants [10][11][12]. El Harmoudi et al, studied the adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) by using two biopolymers based on chitin/chitosan and demonstrated the adsorption ability of 2,4-D onto chitosan due to the interaction between the amino group of chitosan and the carboxyl group of 2,4-D [11].…”

Facile Removal of Pesticides from Aqueous Solutions Using Magnetic Nanocomposites I. Synthesis and characterization of the adsorbent material

“…The adsorption studies were mainly focused on the development and application of new adsorbents, the most promising materials being the activated carbon [8] (used for the removal of a series of herbicides), carbon nanotubes [9] (used for the adsorption of fenuron pesticide) or natural polymers, such as cyclodextrin [10] or chitosan [11]. Another approach for the development of the nextgeneration adsorbents is represented by the core-shell nanostructures, having as main advantage the possibility to be applied in industrial application, as well as their facile removal, after their utilization, by applying an external magnetic field.…”