Roopavathi K V, Shanthakumar S
J Environ Biol. 2016 Sep;37(5):979-84.
In the present study, Curcuma longa (turmeric plant) was used as an adsorbent to remove Basic Green 1 (BG) dye. Batch study was carried out to evaluate the adsorption potential of C. longa and influencing factors such as pH (4-10), adsorbent dose (0.2-5 g l-1), initial dye concentration (50-250 mg l-1) and temperature (30-50°C) on dye removal were analysed. The characterisation of adsorbent was carried out using fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and Brunauer, Emmett and Teller (BET) method. Isotherm models that included Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich, and kinetic models such as pseudo first order, pseudo second-order, Elovich and intraparticle diffusion models were studied. A maximum removal percentage (82.76%) of BG dye from aqueous solution was obtained with optimum conditions of pH 7, 1g l-1 adsorbent dose and 30°C temperature, for 100 mg l-1 initial dye concentration. The equilibrium and kinetic study revealed that the experimental data fitted suitably the Freundlich isotherm and Pseudo second order kinetic model. Thermodynamic analysis proved that adsorption system in this study was spontaneous, feasible and endothermic in nature.
在本研究中，姜黄（姜黄属植物）被用作吸附剂以去除碱性绿1（BG）染料。进行了批次研究以评估姜黄的吸附潜力，并分析了诸如pH值（4 - 10）、吸附剂剂量（0.2 - 5 g l⁻¹）、初始染料浓度（50 - 250 mg l⁻¹）和温度（30 - 50°C）等影响染料去除的因素。使用傅里叶变换红外（FTIR）光谱、扫描电子显微镜（SEM）和布鲁诺尔、埃米特和泰勒（BET）方法对吸附剂进行了表征。研究了包括朗缪尔、弗伦德利希、坦普金和杜比宁 - 拉杜舍维奇等温线模型，以及诸如伪一级、伪二级、埃洛维奇和颗粒内扩散模型等动力学模型。对于100 mg l⁻¹的初始染料浓度，在pH值为7、吸附剂剂量为1 g l⁻¹和温度为30°C的最佳条件下，从水溶液中获得了BG染料的最大去除率（82.76%）。平衡和动力学研究表明，实验数据适合弗伦德利希等温线和伪二级动力学模型。热力学分析证明，本研究中的吸附系统在本质上是自发的、可行的且吸热的。
