Bioenergy and Environment Group, State University of Santa Cruz, Jorge Amado Highway, Km 16, Ilheus, BA, 45662-900, Brazil.
Research Group on Analytical Chemistry of Southern Bahia, State University of Santa Cruz, Jorge Amado Highway, Km 16, Ilheus, BA, 45662-900, Brazil.
Environ Monit Assess. 2020 Feb 25;192(3):197. doi: 10.1007/s10661-020-8110-z.
Organic dyes originating from liquid effluents from the textile industries are harmful to the environment. They are toxic and reduce the penetration of light into aquatic environments. In this study, a biosorbent was produced from the exuviae of Hermetia illucens (Linnaeus) larvae and used to remove organic anionic dyes from an aqueous medium. The solids were characterized in terms of thermal stability, chemical structure, morphology, and porosity using thermogravimetric (TGA), differential thermal analysis (DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and N adsorption-desorption. There were studied the effects of pH and dosage of the adsorbent on the adsorption of the bromophenol blue dye, used as a model molecule. The adsorption kinetics was studied with Lagergren's pseudo-first-order rate model. The maximum adsorbed amount was 571 mg g according to Langmuir's model. The adsorption process was evaluated as exothermic and spontaneous and was classified as physical adsorption. The prepared biosorbent was tested in five consecutive adsorption cycles achieving 99% dye removal at each stage. This demonstrated the maintenance of adsorption efficiency and desorption capacity. These results suggest that prepared biosorbent have potential applications in the treatment of effluents from textile industries.
有机染料来源于纺织工业的液体废水，对环境有害。它们具有毒性，会降低光线穿透水生态系统的能力。在本研究中，从 Hermetia illucens (Linnaeus) 幼虫的蜕皮中制备了一种生物吸附剂，并将其用于从水介质中去除有机阴离子染料。使用热重分析 (TGA)、差示热分析 (DTA)、X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR)、扫描电子显微镜 (SEM) 和 N2 吸附-脱附对固体进行了热稳定性、化学结构、形态和孔隙率的表征。研究了 pH 值和吸附剂用量对溴酚蓝染料吸附的影响，该染料用作模型分子。采用 Lagergren 拟一级速率模型研究了吸附动力学。根据 Langmuir 模型，最大吸附量为 571mg/g。吸附过程被评估为放热和自发的，属于物理吸附。制备的生物吸附剂在五个连续的吸附循环中进行了测试，每个阶段的染料去除率均达到 99%。这表明吸附效率和脱附能力得到了保持。这些结果表明，所制备的生物吸附剂在处理纺织工业废水方面具有潜在的应用。
