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首页> 外文期刊>International Journal of Biological Macromolecules: Structure, Function and Interactions >Surface modification of nanocellulose using polypyrrole for the adsorptive removal of Congo red dye and chromium in binary mixture
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Surface modification of nanocellulose using polypyrrole for the adsorptive removal of Congo red dye and chromium in binary mixture

机译：用聚吡咯的表面改性使用聚吡咯来吸附刚果红染料和二元混合物铬

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In this study, nanocellulose was synthesised by acid hydrolysis of cellulose and was coupled with polypyrrole supporting matrix. The synthesised nanocellulose polypyrrole composite (NCPPY) was characterised by FESEM, XRD, FTIR, BET, TGA/DSC and NMR. These analysis showed the conversion of cellulose to nano sized crystalline structure with excellent thermal stability and higher surface area. The effect of different parameters like pH, temperature, contact time, adsorbent dosage and initial concentration of Chromium (Cr(VI)) and Congo Red (CR) were optimised in batch mode. Response Surface Methodology (RSM) has been employed as an optimization tool for the efficient removal of Cr(VI) and CR and the maximum removal efficiency was found to be 80% and 85% respectively. The Langmuir and Freundlich isotherm well fitted the equilibrium data for CR and Cr(Vl) respectively. Thermodynamic data showed that the biosorption of Cr(VI) and CR on NCPPY is an endothermic, spontaneous, and entropy-driven process. The adsorption kinetic followed pseudo-second-order for Cr(VI) and intraparticle diffusion for CR. Effect of co-existing ions were checked using several common salts and heavy metals. Results indicated that NCPPY has great potential to remove Cr(VI) and CR binary mixture under simulated conditions. (C) 2020 Elsevier B.V. All rights reserved.
机译：在该研究中，通过纤维素酸水解合成纳米纤维素，并与聚吡咯负载基质偶联。合成的纳米纤维素聚吡咯复合物（NCPPY）的特征在于FESEM，XRD，FTIR，BET，TGA / DSC和NMR。这些分析表明，纤维素转化为具有优异的热稳定性和更高表面积的纳米尺寸晶体结构。在pH，温度，接触时间，吸附剂剂量和铬（Cr（vi））和刚果红色（Cr）的初始浓度的不同参数的影响以批速模式优化。响应表面方法（RSM）已采用作为优化工具，以便有效去除Cr（VI）和Cr，并且最大的去除效率分别为80％和85％。 Langmuir和Freundlich等温线分别适用于Cr和Cr（VL）的平衡数据。热力学数据表明，CR（VI）和NCPPY上的CR的生物吸附是吸热，自发性和熵驱动的过程。吸附动力学跟踪Cr（vi）和Cr的粒子分散的伪二次阶。使用几种常见的盐和重金属检查共存离子的影响。结果表明，在模拟条件下，NCPPY具有巨大的潜力可释放CR（VI）和Cr二元混合物。 （c）2020 Elsevier B.v.保留所有权利。

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