自组装和交联的动植物多糖：壳聚糖-纤维素复合材料及其阴离子吸收特性,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

自组装和交联的动植物多糖：壳聚糖-纤维素复合材料及其阴离子吸收特性
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2016-11-21 00:00:00 , DOI: 10.1021/acsami.6b11504
Inimfon A. Udoetok ₁ , Lee D. Wilson ₁ , John V. Headley ₂

Affiliation

自组装和交联的壳聚糖/纤维素戊二醛复合材料（CGC）的制备具有增加的表面积和可变的形态。FTIR，CHN和¹³C固态NMR研究为壳聚糖的胺基和戊二醛之间的交联反应提供了支持。而XRD和TGA研究提供了纤维素与壳聚糖相互作用的证据。SEM，平衡溶胀和氮吸附研究证实了交联生物聚合物的表面积增加和形态变化。在碱性条件下用酚醛染料以及水溶液中的单组分和混合环烷酸酯进行的平衡吸附研究表明，复合材料的吸收性能各不相同。该Freundlich等温模型显示，该复合材料在交联剂，CGC3的最高水平，具有最高的亲和力吸附（ķ _˚F ; l毫摩尔/克），随后为酚酞（PHTH）邻-硝基苯乙酸（ONPAA）和对硝基苯酚（PNP）如下：苯丙氨酸（5.03×10 ^–1）> ONPAA（2.28×10 ^–1）> PNP（8.49×10 ^–2）。Sips等温线模型很好地描述了单组分和环烷酸盐混合物的吸附特性。单层吸收能力（Q _m； mg g ^–1）在括号中给出：2-己基癸酸（S1; 115 mg / g）> 2-萘氧基乙酸（S3; 40.5 mg / g）>反-4-戊基环己基羧酸（S2； 13.7mg / g）。相比之下，Q _m紫外光谱法和电喷雾电离质谱法（ESI-HRMS）测得的环烷酸盐混合物（24.1和27.4 mg / g）的CGC3值。吸附剂材料通常对具有较低或较高双键当量（DBE）值的环烷酸盐显示更大的吸收。动力学研究表明，对phth的吸附采用拟二阶模型描述的行为，而对S3和环烷酸盐混合物的吸收则采用拟一阶行为。这项研究通过说明其可调的吸附特性，有助于更好地了解这两种类型的丰富生物聚合物及其复合材料的吸附特性。疏水相互作用对CGC材料的关键作用是通过控制可变分子结构的羧酸根阴离子的吸附吸收来证明的。

"点击查看英文标题和摘要"

Self-Assembled and Cross-Linked Animal and Plant-Based Polysaccharides: Chitosan–Cellulose Composites and Their Anion Uptake Properties

Self-assembled and cross-linked chitosan/cellulose glutaraldehyde composite materials (CGC) were prepared with enhanced surface area and variable morphology. FTIR, CHN, and ¹³C solid state NMR studies provided support for the cross-linking reaction between the amine groups of chitosan and glutaraldehyde; whereas, XRD and TGA studies provided evidence of cellulose–chitosan interactions for the composites. SEM, equilibrium swelling, and nitrogen adsorption studies corroborate the enhanced surface area and variable morphology of the cross-linked biopolymers. Equilibrium sorption studies at alkaline conditions with phenolic dyes, along with single component and mixed naphthenates in aqueous solution revealed variable uptake properties with the composites. The Freundlich isotherm model revealed that the composite at the highest levels of cross-linker, CGC3, had the highest sorption affinity (K_F; L mmol/g) for phenolphthalein (phth) followed by ortho-nitrophenyl acetic acid (ONPAA) and para-nitrophenol (PNP), as follows: Phth (5.03 × 10^–1) > ONPAA (2.28 × 10^–1) > PNP (8.49 × 10^–2). The Sips isotherm model provided a good description of the sorption profile of single component and naphthenate mixtures. The monolayer uptake capacity (Q_m; mg g^–1) is given in parentheses: 2-hexyldecanoic acid (S1; 115 mg/g) > 2-naphthoxyacetic acid (S3; 40.5 mg/g) > trans-4-pentylcyclohexylcarboxylic acid (S2; 13.7 mg/g). By comparison, the Q_m values for CGC3 with naphthenate mixtures (24.1 and 27.4 mg/g) according to UV spectroscopy and electrospray ionization mass spectrometry (ESI-HRMS). The sorbent materials generally show greater uptake with naphthenates that possess lower vs higher double bond equivalence (DBE) values. Kinetic studies revealed that the sorption of phth adopted behavior described by the pseudo-second order model, while uptake for S3 and naphthenate mixtures adopted pseudo-first order behavior. This study contributes to a greater understanding of the sorption properties of the two types of abundant biopolymers and their composites by illustrating their tunable sorption properties. The key role of hydrophobic interactions for CGC materials was evidenced by the controlled sorptive uptake of carboxylate anions with variable molecular structure.

更新日期：2016-11-21

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南