Centre of Water Sciences, Chitkara University Institute of Engineering and Technology, Chitkara University, Rajpura, Punjab, India.
Environ Sci Pollut Res Int. 2020 Jul;27(21):26406-26418. doi: 10.1007/s11356-020-08977-w. Epub 2020 May 3.
Phytoremediation is an innovative, eco-friendly, and solar-driven technique, which becomes a well-known alternative solution for remediation of hazardous dyes from wastewater. In present research work, potential of a submerged fresh water macroalgae Chara vulgaris L. (C. vulgaris) examined for removal of acidic azo dye methyl red (MR) in its solution form. A series of experiments were done with C. vulgaris to predict the effects of different parameters viz. contact time, initial dye concentration, amount of macroalgae, and pH. The increase in initial dye concentration directly impacts on the potential of macroalgae. The decolorization percentage declined with increase in initial dye concentration. The equilibrium condition was found to achieve after contact time of approximately 48 h. The decolorization of MR dye was found to be favorable at pH 5. The macroalgae was successfully utilized repeatedly with MR for eight cycles in batch experiments. The kinetics of phytoremediation of MR dye was studied with help of pseudo-first-order, pseudo-second-order, and Elovich kinetic models and the results were well suited to pseudo-second-order kinetic model with the correlation value R ≥ 0.99. In addition, the experimental data was also assessed by using Langmuir and Freundlich adsorption equilibrium isotherms. The results of phytoremediation data was found to be in favor of Freundlich equilibrium isotherm which having the correlation value R ≥ 0.977. The intraparticle diffusion model also studied to interpret the macroalgae phytoremediation mechanism for phytoremediation of MR. The surface interactions of C. vulgaris were investigated before and after the removal of dye with Fourier transform-infrared spectroscopy (FTIR) technique. On the basis of these studies, a hypothetical mechanism has also been proposed to depict the phytoremediation of acidic azo dye by C. vulgaris.
植物修复是一种创新的、环保的、太阳能驱动的技术，已成为修复废水中有害染料的知名替代方案。在目前的研究工作中，考察了淡水大型藻类 Chara vulgaris L.（C. vulgaris）用于去除溶液中酸性偶氮染料甲基红（MR）的潜力。使用 C. vulgaris 进行了一系列实验，以预测不同参数（如接触时间、初始染料浓度、藻类用量和 pH 值）的影响。初始染料浓度的增加直接影响藻类的潜力。脱色率随初始染料浓度的增加而下降。在接触时间约为 48 h 后达到平衡条件。在 pH 5 时，MR 染料的脱色效果较好。在批量实验中，用 MR 成功地重复使用藻类 8 次。通过准一级、准二级和 Elovich 动力学模型研究了 MR 染料的植物修复动力学，并发现结果非常适合准二级动力学模型，相关值 R ≥ 0.99。此外，还使用 Langmuir 和 Freundlich 吸附平衡等温线对植物修复实验数据进行了评估。植物修复数据的结果有利于 Freundlich 平衡等温线，相关值 R ≥ 0.977。还研究了内扩散模型，以解释 C. vulgaris 植物修复 MR 的机制。使用傅里叶变换-红外光谱（FTIR）技术在去除染料前后研究了 C. vulgaris 的表面相互作用。在此基础上，还提出了一个假设的机制，以描述 C. vulgaris 对酸性偶氮染料的植物修复。
