Departamento de Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, 5 de Febrero 818 Sur, 85000 Ciudad Obregón, Sonora, México.
Water Sci Technol. 2012;65(4):618-23. doi: 10.2166/wst.2012.900.
The present study was designed to evaluate the chitosan, which has been obtained by deacetylation of chitin, as a biosorbent. The chitin was isolated from fermented shrimp waste by an important local industrial food biopolymer. The aim of this work was the characterization of chitosan and preparation of cross-linked chitosan- tripolyphosphate (chitosan-TPP) beads for the removal of allura red food dye from aqueous solutions. Conditions of batch adsorption such as pH, time and adsorbent dose were examined. The effectiveness of cross-linked chitosan beads for dye removal was found to be higher for pH 2 (98%, percentage of dye removal) and tends to decrease at pHs of 3 to 11 (up to 49%). The values of percentage removal show that the adsorption capacity increases with time of contact and dosage of chitosan-TPP, but red dye adsorption is mainly influenced by pH level. The cross-linked chitosan-TPP beads can significantly adsorb allura red monoazo dye from aqueous solutions even at acidic pHs unlike raw chitosan beads that tend to dissolve in acidic solutions. Consequently, this modified chitosan has characteristics that allow minimization of environmental pollution and widening the valorization of shrimp waste.
本研究旨在评估壳聚糖作为一种生物吸附剂。壳聚糖是通过甲壳素脱乙酰化获得的，甲壳素是从发酵虾废物中提取的一种重要的本地工业食品生物聚合物。这项工作的目的是对壳聚糖进行表征，并制备交联壳聚糖-三聚磷酸钠（壳聚糖-TPP）珠粒，以去除水溶液中的诱惑红食品染料。考察了批吸附条件，如 pH 值、时间和吸附剂剂量。交联壳聚糖珠粒对染料去除的效果在 pH 值为 2 时最高（98%，染料去除率），在 pH 值为 3 至 11 时趋于降低（最高为 49%）。去除率的值表明，吸附容量随接触时间和壳聚糖-TPP 用量的增加而增加，但红色染料的吸附主要受 pH 值的影响。交联壳聚糖-TPP 珠粒可以显著吸附水溶液中的诱惑红单偶氮染料，即使在酸性 pH 值下也如此，而原始壳聚糖珠粒在酸性溶液中容易溶解。因此，这种改性壳聚糖具有减少环境污染和拓宽虾废物利用的特点。
