使用香蕉皮粉作为吸附剂从水溶液中去除阴离子染料（活性黑 5 和刚果红）。

Removal of anionic dyes (Reactive Black 5 and Congo Red) from aqueous solutions using Banana Peel Powder as an adsorbent.

机构信息

Department of Environmental Science and Engineering, Ewha Womans University, 11-1 Daehyun-Dong, Seodaemun-Gu, Seoul 120-750, Republic of Korea.

Department of Chemistry, Vikrama Simhapuri University, Nellore 524003, Andhra Pradesh, India.

出版信息

Ecotoxicol Environ Saf. 2018 Feb;148:601-607. doi: 10.1016/j.ecoenv.2017.10.075. Epub 2017 Nov 9.

DOI:10.1016/j.ecoenv.2017.10.075

PMID:29127823

Abstract

The adsorption characteristics of Reactive Black 5 (RB5) and Cong Red (CR) onto Banana Peel Powder (BPP) from aqueous solution were investigated as a function of pH, contact time, initial dye concentration and temperature. The BPP was characterized by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) analysis. FTIR results revealed that hydroxyl (-OH), amine (-NH) and carboxyl (-C˭O) functional groups present on the surface of BPP. The SEM results show that BPP has an irregular and porous surface morphology which is adequate for dye adsorption. The equilibrium data were analyzed using Langmuir and Freundlich isotherm models. Experimental results were best represented by the Langmuir isotherm model. The adjustments of models were confirmed by the Chi-square (χ) test and the correlation coefficients (R). The maximum monolayer adsorption capacities of RB5 and CR on BPP calculated from Langmuir isotherm model were 49.2 and 164.6mg/g at pH 3.0 and 298K. Experimental data were also tested in terms of adsorption kinetics using pseudo-first-order and pseudo-second-order kinetic models. The results showed that the adsorption processes of both RB5 and CR followed well pseudo-second-order kinetic models. The calculated thermodynamic parameters ΔG°, ΔH° and ΔS° showed that the adsorption of RB5 and CR onto BPP was feasible, spontaneous and endothermic in the temperature range 298-318K. The RB5 and CR were desorbed from BPP using 0.1M NaOH. The recovery for both anionic dyes was found to be higher than 90%. Based on these it can be concluded that BPP can be used as an effective, low cost, and eco-friendly adsorbent for CR removal than RB5 from aqueous solution.

摘要

从水溶液中研究了香蕉皮粉（BPP）对活性黑 5（RB5）和刚果红（CR）的吸附特性，考察了 pH、接触时间、初始染料浓度和温度的影响。通过傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）分析对 BPP 进行了表征。FTIR 结果表明，BPP 表面存在羟基（-OH）、胺（-NH）和羧基（-C˭O）官能团。SEM 结果表明，BPP 具有不规则多孔的表面形貌，有利于染料吸附。使用 Langmuir 和 Freundlich 等温模型分析了平衡数据。实验结果最好用 Langmuir 等温模型来表示。通过卡方（χ）检验和相关系数（R）对模型的调整进行了确认。从 Langmuir 等温模型计算得出，RB5 和 CR 在 pH 3.0 和 298K 下在 BPP 上的最大单层吸附容量分别为 49.2 和 164.6mg/g。根据吸附动力学，也使用伪一级和伪二级动力学模型对实验数据进行了测试。结果表明，RB5 和 CR 的吸附过程均很好地遵循伪二级动力学模型。计算得到的热力学参数ΔG°、ΔH°和ΔS°表明，在 298-318K 的温度范围内，RB5 和 CR 吸附到 BPP 上是可行的、自发的和吸热的。使用 0.1M NaOH 从 BPP 上解吸 RB5 和 CR。发现两种阴离子染料的回收率均高于 90%。综上所述，可以得出结论，BPP 可以用作从水溶液中去除 CR 比 RB5 更有效、低成本和环保的吸附剂。