Pectin extraction from cocoa (Theobroma cacao L) pod husk and its application as cadmium (Cd) metal adsorbent

F. A. Souhoka, M. Tanasale, Sardi Tomia
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引用次数: 1

Abstract

The cocoa pod contains pectin, which has hydroxyl and carboxyl groups to adsorb Cd metal ions. This study aims to determine pectin’s yield from cocoa pod husk (CPH), characterization of pectin, and optimum condition of Cd metal ion adsorption by varying pH, contact time, and Cd metal ion concentration. Pectin was extracted from CPH powder using 5% HCl at 95 °C for 2 hours, followed by pectin precipitation using 96% ethanol. The yield of pectin from CPH was 6.169%. Identification of functional group using FTIR spectrophotometer, obtained absorption at wavenumbers (cm-1): 3277.06 (-OH), 2945.30 (-Csp3H), 1666.50 (C=O), 1384.89 (-CH3), 1157.69 (-CO), and 1082.07 (-C-OH). The pectin characteristic was the moisture content of 0.039%; ash content of 10.634%; the equivalent weight of 757.77 mg; methoxyl content of 5.303%; galacturonic acid content of 73.01%; and the degree of esterification 41.23%; Analysis of the absorbed Cd metal ion using AAS. The optimum conditions of Cd metal ion adsorption by pectin was obtained at pH 11; contact time 30 minutes; with the percentage of adsorbed get 99.76% and adsorption capacity of 2.4927 mg/g at 50 ppm of Cd metal ion concentration.
可可荚壳中果胶的提取及其作为镉金属吸附剂的应用
可可豆荚中含有果胶,果胶具有羟基和羧基,可以吸附镉金属离子。研究了不同pH、接触时间和Cd金属离子浓度对可可豆荚壳果胶收率的影响,确定了果胶的性质,确定了吸附Cd金属离子的最佳条件。用5%盐酸在95℃下提取CPH粉中的果胶2小时,用96%乙醇沉淀果胶。CPH的果胶收率为6.169%。用FTIR分光光度计鉴定官能团,得到吸收波数(cm-1): 3277.06 (-OH)、2945.30 (-Csp3H)、1666.50 (C=O)、1384.89 (-CH3)、1157.69 (-CO)和1082.07 (-C-OH)。果胶特性为含水率0.039%;灰分含量10.634%;当量重量757.77毫克;甲氧基含量5.303%;半乳糖醛酸含量73.01%;酯化度为41.23%;原子吸收光谱法分析吸收的金属镉离子。确定了果胶吸附Cd金属离子的最佳条件为pH为11;接触时间30分钟;在Cd金属离子浓度为50 ppm时,吸附率为99.76%,吸附量为2.4927 mg/g。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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