Synthesis and application of a new carboxylated cellulose derivative. Part I: Removal of Co²⁺, Cu²⁺ and Ni²⁺ from monocomponent spiked aqueous solution

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• 作者：Filipe Simõ ; es Teodoro^a ; Stela Nhandeyara do Carmo Ramos^a ; Megg Madonyk Cota Elias^a ; Aparecida Barbosa Mageste^a ; Gabriel Max Dias Ferreira^b ; Luis Henrique Mendes da Silva^b ; Laurent Fré ; dé ; ric Gil^a ; Leandro Viní ; cius Alves Gurgel^a ; ^{legurgel@iceb.ufop.br" class="auth_mail" title="E-mail the corresponding author} ; ^{legurgel@yahoo.com.br" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Carboxylated cellulose ; 1 ; 2 ; 4-Benzenetricarboxylic anhydride ; Adsorption ; Desorption ; Isothermal titration calorimetry ; Thermodynamics
• 刊名：Journal of Colloid and Interface Science
• 出版年：2016
• 出版时间：1 December 2016
• 年：2016
• 卷：483
• 期：Complete
• 页码：185-200
• 全文大小：2476 K

文摘

A new carboxylated cellulose derivative (CTA) was prepared from the esterification of cellulose with 1,2,4-Benzenetricarboxylic anhydride. CTA was characterized by percent weight gain (pwg), amount of carboxylic acid groups (n_COOH), elemental analysis, FTIR, TGA, solid-state ¹³C NMR, X-ray diffraction (DRX), specific surface area, pore size distribution, SEM and EDX. The best CTA synthesis condition yielded a pwg and n_COOH of 94.5% and 6.81 mmol g⁻¹, respectively. CTA was used as an adsorbent material to remove Co²⁺, Cu²⁺ and Ni²⁺ from monocomponent spiked aqueous solution. Adsorption studies were developed as a function of the solution pH, contact time and initial adsorbate concentration. Langmuir model better fitted the experimental adsorption data and the maximum adsorption capacities estimated by this model were 0.749, 1.487 and 1.001 mmol g⁻¹ for Co²⁺, Cu²⁺ and Ni²⁺, respectively. The adsorption mechanism was investigated by using isothermal titration calorimetry. The values of Δ_adsH° were in the range from 5.36 to 8.09 kJ mol⁻¹, suggesting that the mechanism controlling the phenomenon is physisorption. Desorption and re-adsorption studies were also performed. Desorption and re-adsorption efficiencies were closer to 100%, allowing the recovery of both metal ions and CTA adsorbent.