Abstract

In this article, we describe a novel method for the modification of nanocellulose (MNC) produced from coconut coir (a bio-waste) by acetylization applied to the removal of vanadium (V) and chromium (III) metal ions from an aqueous phase in a batch study. The structure of the MNC formed was confirmed using Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray (EDX), and atomic force microscopy (AFM) analysis. The adsorptive capacity of MNC was enhanced upon modification, achieving 93.6% removal for V V and 84.6% for Cr III at pH 5 within 30 min. The sorption data followed the Langmuir isotherm model (Q_max V V; 32.88 and Cr III; 114 mg g⁻¹) with the fast adsorption rate following the pseudo-first-order model (k₁ V V; 0.06 and Cr III 0.073 min⁻¹, respectively). Thus, the MNC from coconut coir very much displayed the desired potential as a sorbent for the removal of these toxic pollutants from wastewater. The sorbent has a promising capability owing to its high sorption capacity which can be used at the industrial scale.

摘要

在本文中，我们描述了一种通过乙酰化改性从椰子壳（一种生物废物）生产的纳米纤维素 (MNC) 的新方法，该方法适用于从水相中去除钒 (V) 和铬 (III) 金属离子批量研究。使用傅里叶变换红外光谱 (FTIR)、能量色散 X 射线 (EDX) 和原子力显微镜 (AFM) 分析证实了形成的 MNC 的结构。MNC 的吸附能力在改性后得到增强，在 pH 5 下，30 分钟内 VV 去除率达到 93.6%，Cr III 去除率达到 84.6%。吸附数据遵循 Langmuir 等温线模型 ( Q _max VV; 32.88 and Cr III; 114 mg g ^-1 )，并遵循伪一级模型 ( k ₁VV; 0.06 和 Cr III 0.073 min ^-1）。因此，椰子壳中的 MNC 非常具有作为吸附剂去除废水中这些有毒污染物的潜力。该吸附剂具有高吸附能力，可用于工业规模，因此具有广阔的应用前景。