<br>菠萝叶纤维制备的改性纤维素去除重金属离子,ACS Omega

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菠萝叶纤维制备的改性纤维素去除重金属离子
ACS Omega ( IF 3.7 ) Pub Date : 2020-03-05 , DOI: 10.1021/acsomega.9b04326
Amphol Daochalermwong ₁ , Napassorn Chanka ₁ , Kriangsak Songsrirote ₂ , Peerapan Dittanet ₁ , Chalida Niamnuy ₁ , Anusorn Seubsai ₁

Affiliation

由于农业区收获后大量菠萝叶被丢弃，因此利用菠萝叶开发增值产品的可能性引起了人们的兴趣。本工作从菠萝叶中提取纤维素纤维，并用乙二胺四乙酸（EDTA）和羧甲基（CM）基团进行改性，分别生产Cell-EDTA和Cell-CM，然后将其用作重金属离子吸附剂。为了研究吸附效率，使用铅离子(Pb ²⁺ )或镉离子(Cd ²⁺ )溶液作为废水。在pH 1-7范围内，Cell-EDTA和Cell-CM的吸附效率显着高于未改性纤维素。 Cell-EDTA 对 Pb ²⁺和 Cd ^{2+ 的}最大吸附量分别为 41.2 和 33.2 mg g ^–1 ，对于 Cell-CM 分别为 63.4 和 23.0 mg g ^–1 。 Cell-CM对Pb ²⁺和Cd ²⁺的吸附行为符合准一级模型，而Cell-EDTA对Pb ²⁺和Cd ²⁺的吸附行为符合准二级模型。所有吸附行为都可以使用朗缪尔吸附等温线来描述。使用 1 M HCl 对两种吸附剂上的 Pb ²⁺和 Cd ²⁺解吸研究表明，对于两种吸附剂，Cell-EDTA 的再生能力均优于 Cell-CM。此外，不同比例的Pb ²⁺和Cd ²⁺混合物的吸附测量表明，两种吸附剂对Pb ²⁺的吸附均高于Cd ²⁺ ，而Cell-CM 对Pb ²⁺的吸附选择性大于 Cell-EDTA。这项研究表明，由菠萝叶制成的改性纤维素吸附剂能够有效吸附金属离子。

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Removal of Heavy Metal Ions Using Modified Celluloses Prepared from Pineapple Leaf Fiber

Since large amounts of pineapple leaves are abandoned after harvest in agricultural areas, the possibility of developing value-added products from them is of interest. In this work, cellulose fiber was extracted from pineapple leaves and modified with ethylenediaminetetraacetic acid (EDTA) and carboxymethyl (CM) groups to produce Cell-EDTA and Cell-CM, respectively, which were then used as heavy metal ion adsorbents. A solution of either lead ion (Pb²⁺) or cadmium ion (Cd²⁺) was used as wastewater for the purpose of studying adsorption efficiencies. The adsorption efficiencies of Cell-EDTA and Cell-CM were significantly higher than those of the unmodified cellulose in the pH range 1–7. Maximum adsorptions toward Pb²⁺ and Cd²⁺ were, for Cell-EDTA, 41.2 and 33.2 mg g^–1, respectively, and, for Cell-CM, 63.4 and 23.0 mg g^–1, respectively. The adsorption behaviors of Cell-CM for Pb²⁺ and Cd²⁺ fitted well with a pseudo-first-order model, but those of Cell-EDTA for Pb²⁺ and Cd²⁺ fitted well with a pseudo-second-order model. All of the adsorption behaviors could be described using the Langmuir adsorption isotherm. Desorption studies of Pb²⁺ and Cd²⁺ on both adsorbents using 1 M HCl suggested that regenerability of Cell-EDTA was, for both adsorbates, better than that of Cell-CM. Moreover, adsorption measurements in a mixture of Pb²⁺ and Cd²⁺ at various ratios showed that for both adsorbents the adsorption of Pb²⁺ was higher than that of Cd²⁺, while the adsorption selectivity for Pb²⁺ of Cell-CM was greater than that of Cell-EDTA. This study showed that the modified cellulosic adsorbents made from pineapple leaves were able to efficiently adsorb metal ions.

更新日期：2020-03-19

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