Adsorption of Atrazine and Simazine from Aqueous Solutions onto Poly(ε‐Caprolactone)

Abstract

The biodegradable synthetic polymer poly(e-caprolactone) was investigated as a substrate for denitrification. This substrate may also act as an adsorbent for two pesticides, i. e., atrazine and simazine, from water. The equilibrium was studied at 25, 35 and 458C. The results were correlated using the Langmuir and Freundlich adsorption models. The total capacities of the adsorbent were defined from experimental data for atrazine (10.98 mg g -1 ) and simazine (27.54 mg g -1 ). The effect of temperature on the model constants and the thermodynamics of adsorption were investigated. The evaluation of the development of adsorption was achieved by assuming a pseudo-second order chemical reaction.

Pesticides Removal Using Conventional and Low‐Cost Adsorbents: A Review

“…Wang and Lemley 62 studied the oxidative degradation and detoxification of aqueous CF by using a new version of Fenton technology named membrane anodic Fenton treatment. Also the adsorption process of atrazine and samazine onto biodegradable synthetic polymer poly(ε‐caprolactone) from water investigated by Ovez and Holl 63. As a result of their study total capacities of the adsorbent from experimental data for atrazine and simazine were obtained 10.98 and 27.54 mg/g, respectively.…”

“…The following of sorption process kinetic from the second‐order equation means that overall rate of the process is controlled by chemical processes. Ovez and Holl 63 investigated that atrazine and simazine adsorption from aqueous solution onto poly(ε‐caprolactone) follows by the pseudo‐second‐order sorption process via a chemical reaction approach. In addition, film diffusion as the rate‐controlling step in systems was considered.…”

“…The Gibbs free energy change (Δ G ), enthalpy (Δ H ), and entropy change (Δ S ) are very important thermodynamic parameters of adsorption that can confirm the feasibility, spontaneity, and heat change for the biosorption process. The following equations were presented for calculation of those parameters 63, 65, 89, 90: where R is the universal gas constant (8.314 J mol −1 K −1 ), T the temperature (K), and K d is the distribution coefficient. The K d ‐value was calculated using the following equation 89: where q e and C e are the equilibrium concentration of sorbate on biosorbent (mg/L) and in the solution (mg/L), respectively.…”

Use of Pistachio Shells as an Adsorbent for the Removal of Zinc(II) Ion

“…5, the overall standard free energy changes during the adsorption process were negative for the experimental range of temperatures. www.clean-journal.com [40]. The change of free energy for physisorption is generally between À20 and 0 kJ mol À1 , the physisorption together with chemisorptions is at the range of À20 to À80 kJ mol À1 and chemisorptions is at the range of À80 to 400 kJ mol À1 [41].…”

Evaluation of Two Low‐Cost–High‐Performance Adsorbent Materials in the Waste‐to‐Product Approach for the Removal of Pesticides from Drinking Water

“…Adsorption processes were studied intensively using a wide range of adsorption materials and emerged as one of the most promising techniques 23 due to their low investment cost, ease of operation, and efficiency for the removal organic and inorganic micropollutants including pesticides 24–26. Adsorption on activated carbon is the most widespread technology used for purification of water contaminated by pesticides 11.…”