Parthipan Punniyakotti, Cheng Liang, Rajasekar Aruliah, Govarthanan Muthusamy, Subramania Angaiah
Electro-Materials Research Laboratory, Centre for Nanoscience and Technology, Pondicherry University, Puducherry, 605014, India.
School of Environment and Safety Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, China.
Environ Res. 2021 May;196:110983. doi: 10.1016/j.envres.2021.110983. Epub 2021 Mar 8.
The disposal of untreated textile industrial wastewater having unmanageable pollutants is a global issue. Eco-friendly remediation technology is needed for the removal of environmental contaminants. In this study, a simple hydrothermal method is adapted to synthesis reduced graphene oxide (PErGO) using Phyllanthus emblica fruits extract and used as a photocatalyst for the degradation of synthetic toxic dyes. The physicochemical properties of green synthesized PErGO are confirmed using UV-Vis spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction. The I/I ratio is found as 1.02 for GO which is improved to 1.15 for PErGO, which confirms the existence of unrepaired defects after the elimination of negatively charged O moieties from the surface of GO. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analysis show well-exploited PErGO morphology. The photocatalytic removal of methylene blue (MB) and methyl orange (MO) dyes is confirmed using UV-vis spectrophotometer. PErGO shows about 92% of MO and 91% of MB degradation within 90 min of sunlight exposure while carried out as a mixed dye degradation. The sustainability of this catalyst is confirmed by testing it for five subsequent degradation cycles and noticed a stable and significant degradation activity. Outcomes from this study suggest that eco-friendly PErGO can be used as an alternate sustainable material to treat a large volume of wastewater from various dye industries.
处理含有难以处理污染物的未处理纺织工业废水是一个全球性问题。需要环保修复技术来去除环境污染物。在本研究中，采用一种简单的水热法，利用余甘子果实提取物合成还原氧化石墨烯（PErGO），并将其用作光催化剂来降解合成有毒染料。通过紫外可见光谱、拉曼光谱、傅里叶变换红外光谱（FT-IR）、X射线衍射对绿色合成的PErGO的物理化学性质进行了确认。发现GO的I/I比为1.02，而PErGO的I/I比提高到1.15，这证实了从GO表面消除带负电荷的O部分后存在未修复的缺陷。场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）分析显示了PErGO良好的形态。使用紫外可见分光光度计确认了亚甲基蓝（MB）和甲基橙（MO）染料的光催化去除效果。在混合染料降解实验中，PErGO在阳光照射90分钟内显示出约92%的MO降解率和91%的MB降解率。通过对该催化剂进行五个连续降解循环测试，证实了其可持续性，并观察到稳定且显著的降解活性。本研究结果表明，环保型PErGO可作为一种替代可持续材料，用于处理来自各种染料行业的大量废水。
