Xylan is found in natural products and can be used for preparing value-added products. The main purpose of this study was to produce a xylan-based polymer (xylan–acrylic acid [Xy–AA]) as a flocculant for removing ethyl violet dye from wastewater. In this study, the polymerization reaction of xylan and acrylic acid (AA) was optimized by response surface methodology (RSM). It was indicated that the maximum charge density of –5.87 mmol/g and molecular weight of 352,028 g/mol were obtained for Xy–AA polymer under the conditions of 20.53 g/L xylan concentration, 0.31 xylan/AA molar ratio, 2.5 h reaction time, and 72 °C reaction temperature. The polymer was characterized by charge density analyzer, Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H-NMR), and thermogravimetric analysis (TGA). The application of the product as a flocculant for removing the ethyl violet from simulated dye solution was evaluated. The results showed that the optimal dye removal of 97.08% was achieved under the conditions of 50 mg/L dye concentration, 120 mg/L Xy–AA concentration, pH 10, and 30 °C. The flocculation mechanism was also discussed.

中文翻译：

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高分子量木聚糖-丙烯酸聚合物的制备及其作为脱色絮凝剂的应用

木聚糖存在于天然产品中，可用于制备增值产品。本研究的主要目的是生产一种木聚糖基聚合物（木聚糖-丙烯酸 [Xy-AA]）作为絮凝剂，用于去除废水中的乙基紫染料。在本研究中，木聚糖和丙烯酸 (AA) 的聚合反应通过响应面法 (RSM) 进行了优化。结果表明，在 20.53 g/L 木聚糖浓度、0.31 木聚糖/AA 摩尔比、2.5 h 反应条件下，Xy-AA 聚合物的最大电荷密度为 –5.87 mmol/g，分子量为 352,028 g/mol时间和 72 °C 反应温度。该聚合物通过电荷密度分析仪、傅里叶变换红外光谱 (FTIR)、质子核磁共振 (1H-NMR) 和热重分析 (TGA) 进行表征。评价了该产品作为从模拟染料溶液中去除乙基紫的絮凝剂的应用。结果表明，在 50 mg/L 染料浓度、120 mg/L Xy-AA 浓度、pH 10 和 30 °C 条件下，染料去除率达到 97.08%。还讨论了絮凝机制。