Study of the Adsorption Efficiency of an Eco-Friendly Carbohydrate Polymer for Contaminated Aqueous Solution by Organophosphorus Pesticide

Abstract

The removal of pesticide (ethoprophos) from aqueous solution using a natural biosorbent such as chitosan (CH) prepared from a biopolymer waste obtained from marine industry was studied. The Fourier Transform Infrared Spectroscopy (FTIR), Scanning electron microscopy (SEM), and X-ray diffraction spectroscopy (XRD) were used to study the structure of the adsorbent. The biosorption studies were carried out under various parameters, such as biosorbent dose, initial pesticide concentration and contact time. The experimental results show that the removal percentage of ethoprophos increased from 85.693% to 89.234%, as adsorbent dose (CH) increased from 0.02 to 0.1 g/100ml. The equilibrium uptake was increased with an increase in the initial pesticide concentration in solution. Biosorption kinetic data were fitted well with the pseudo-second order kinetic model. The experimental isotherms data were analyzed using Freundlich, Langmuir, Temkin and Dubinin-Radushkevich (D-R) isotherm equations. The best fit was obtained by Freundlich isotherm with high correlation coefficients. That the value of energy calculated from the D-R isotherm was 5.56 KJ/mol suggests the adsorption of ethoprophos on Chitosan is physical. All the results indicating CH was chosen as low-cost biosorbent could be applied for the removal of organophosphorous pesticide from aqueous solutions.

Removal of Cd2+ ions from aqueous solution using cassava starch–based superabsorbent polymers

“…The adsorption capacity of CST‐SAP decreased from 295.78 to 57.43 mg/g with increasing dosage from 0.1 to 0.6 g/mL for Cd 2+ ions. The decrease can be attributed to the remaining unsaturation of the adsorption sites during the process, whereas the number of sites available increases by increasing the CST‐SAP dosage . The adsorption capacity was low at high adsorbent dose due to a smaller amount of cadmium per unit mass of adsorbent .…”

“…The residual Cd 2+ ion concentration in the filtrate was measured by atomic absorption spectrometry (AAS‐5000, Germany). The equilibrium adsorption capacity ( Q e ) and the removal percentage (%) of the CST‐SAPs were calculated using the following equations: where C 0 (µg/mL) and V 0 (mL) are the initial content and volume of metal ion, respectively; C e (µg/mL) and V e (mL) are the equilibrium content and volume; m 0 (g) is the mass of the biosorbent; Q e (mg/g) is the equilibrium adsorption capacity of the metal ion; and % R is the percentage removal …”

Treatment of Oily Wastewater by Using Porous PVA Hydrogels as Oil Adsorbent

“…So, thus increasing in the adsorption can attribute to greater surface area of hydrogel particles and the availability of more adsorption surface sites [27]. Also, the results showed that at a HPVAF dose (1g), the removal percentage is high compared with that one of the HPVA.…”

The efficient hemostatic effect of Antarctic krill chitosan is related to its hydration property

“…It showed a sharp peak at 20 • and a broad peak around 13 • . P-Chitosan only exhibited a sharp and strong diffraction peak at 20 • as the (1 1 0) reflection of chitosan, indicative of the high degree of crystallinity (Abdeen & Mohammad, 2014). In S-Chitosan and A-Chitosan, there was a decrease in the intensity of (1 1 0) reflection, which correlated with the crystallinity.…”