Sethu Institute of Technology, Department of Chemistry, Kariapatti, Virthunagar District, Tamil Nadu, India.
School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea.
Int J Biol Macromol. 2024 Feb;258(Pt 2):128970. doi: 10.1016/j.ijbiomac.2023.128970. Epub 2023 Dec 26.
The utilization of banana fiber derived from micro-cellulose (MC) was exploited as a supporting material for advanced oxidation process (AOP) on the degradation of methylene blue and methyl violet dyes in the presence of HO-UV in aqueous medium for the first time using green chemistry protocols. Additionally, it was also effectively utilized for the adsorption of methylene blue dye using addition of HO in the presence of sunlight. The MC powder was fabricated using an acid alkali process from the pseudo-stem of a banana tree. The as-fabricated MC powder was systematically characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectrometer (EDX), and zero point charge (pH). The AOP assisted degradation of dye molecules was monitored by using calorimetric techniques as a function of dye concentration and pH in a batch reactor. In a short period of time, the maximum degradation efficiency of 98 % of methylene blue was achieved using MC powder assisted HO under UV irradiation at a minimum irradiation time of 120 min at pH 7.0 using dosage of 0.2 g/L. However, in the absence of UV light, the degradation efficiency of MC powder assisted HO was only about 5-10 % without UV light irradiation. The dye removal was studied as a function of various operational parameters such as pH (3-11), catalyst dose (0.2-0.6 g/L), and initial dye concentration (100-400 mg/L). In the presence of HO-sunlight and 0.2 g/L of dosage at pH 7.0 at a minimum contact time of 120 min, MC fiber showed maximum adsorption capacities of 98% and 85% for 100 mg/L and 400 mg/L of methylene blue concentrations. According to the obtained data, the adsorption of methylene blue dye on MC follows the Freundlich isotherm model (R = 0.9886) and pseudo-first-order kinetic model (R = 0.9596) due to the higher regression coefficients. This process of dye degradation and adsorption process is a novel one and environmentally benign for an effective removal of hazardous dyes.
首次利用绿色化学协议，将源自微纤维素 (MC) 的香蕉纤维用作支持材料，在水介质中存在 HO-UV 的情况下，对亚甲基蓝和甲基紫染料进行高级氧化处理 (AOP)，以实现降解。此外，还可以通过在阳光存在下添加 HO 来有效吸附亚甲基蓝染料。MC 粉末是通过从香蕉树的假茎中使用酸碱工艺制造的。使用傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、场发射扫描电子显微镜 (FE-SEM)、能量色散 X 射线光谱仪 (EDX) 和零电荷 (pH) 对制造的 MC 粉末进行系统表征。通过使用量热技术作为批处理反应器中染料浓度和 pH 的函数，监测染料分子的 AOP 辅助降解。在短时间内，在 pH 为 7.0 时，在 120 分钟的最小照射时间内，使用 0.2 g/L 的剂量，在 UV 照射下使用 MC 粉末辅助 HO 可实现高达 98%的亚甲基蓝最大降解效率。然而，在没有 UV 光的情况下，在没有 UV 光照射的情况下，MC 粉末辅助 HO 的降解效率仅约为 5-10%。研究了染料去除作为各种操作参数的函数，例如 pH（3-11）、催化剂剂量（0.2-0.6 g/L）和初始染料浓度（100-400 mg/L）。在 pH 为 7.0 时，在 0.2 g/L 的剂量下，在阳光和最小接触时间为 120 分钟的情况下，MC 纤维对 100 mg/L 和 400 mg/L 的亚甲基蓝浓度表现出最大的吸附能力，分别为 98%和 85%。根据获得的数据，MC 上亚甲基蓝染料的吸附遵循 Freundlich 等温线模型（R = 0.9886）和伪一阶动力学模型（R = 0.9596），因为回归系数较高。这种染料降解和吸附过程是新颖的，对有效去除危险染料具有环境友好性。
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