Abstract

Nowadays, the colored wastewater generated primarily from dyeing and textile industries loaded with synthetic dyes are considered to be one of the key reason for water pollution. However, the remarkable development in material science resulted to fabrication of highly efficient composite materials for effective remediation of such wastewaters. In recent times, polymer matrix-based nanocomposites have turned out to be an outstanding domain of research considering the potential application of polymeric nanocomposite in several important areas including environmental remediation. In this work, the fabrication of a novel iron oxide/polyaniline polymeric nanocomposite (Iron oxide-PANI-PNC) was reported and its sono-assisted adsorptive potential was studied for a toxic anionic dye, Eriochrome Black-T (EBT). This study clears that pure iron oxide has strong pH dependency and it shows maximum dye adsorption only at highly acidic conditions. However, Iron oxide-PANI-PNC could reduce this pH dependency significantly and this polymeric nano-composite shows enhanced dye removal in the wide range of pH from 2.0 to 5.0. Langmuir isotherm model was best fitted to EBT dye adsorption experimental data onto Iron oxide-PANI-PNC with a maximum monolayer adsorption capacity of 285.71 mg/g. Sono-assisted EBT dye adsorption process has achieved an enhanced removal efficiency of 93% as compared to magnetic stirring (65%) and batch stirring (60%). Response surface methodology (RSM) based optimization revealed that maximum EBT dye uptake adsorption of 99.61% at Iron oxide-PANI-PNC dose of 0.8 g/L, sonication time of 27 min, and initial EBT dye concentration of 30 mg/L.

摘要

如今，主要来自印染和纺织工业产生的含有合成染料的有色废水被认为是造成水污染的主要原因之一。然而，材料科学的显着发展导致制造高效复合材料以有效修复此类废水。近年来，考虑到聚合物纳米复合材料在包括环境修复在内的几个重要领域的潜在应用，基于聚合物基质的纳米复合材料已成为一个突出的研究领域。在这项工作中，报道了一种新型氧化铁/聚苯胺聚合物纳米复合材料（氧化铁-PANI-PNC）的制备，并研究了其对有毒阴离子染料 Eriochrome Black-T (EBT) 的声辅助吸附潜力。该研究表明纯氧化铁具有很强的 pH 依赖性，并且仅在高酸性条件下才显示出最大的染料吸附。然而，氧化铁-PANI-PNC 可以显着降低这种 pH 依赖性，并且这种聚合物纳米复合材料在 2.0 至 5.0 的广泛 pH 范围内显示出增强的染料去除。Langmuir 等温线模型最适合 EBT 染料在氧化铁-PANI-PNC 上的吸附实验数据，最大单层吸附容量为 285.71 毫克/克。与磁力搅拌 (65%) 和分批搅拌 (60%) 相比，Sono 辅助 EBT 染料吸附工艺的去除效率提高了 93%。基于响应面方法 (RSM) 的优化表明，在氧化铁-PANI-PNC 剂量为 0.8 g/L、超声处理时间为 27 分钟和初始 EBT 染料浓度为 30 mg/L 时，最大 EBT 染料吸收吸附为 99.61%。