Abstract

A hybrid composite biopolymer of magnetic chitosan-fly ash/Fe₃O₄ (CS-FA/Fe₃O₄) was prepared to be an effective composite biosorbent for the removal of reactive orange 16 (RO16) dye from aqueous media. Various analytical techniques such as XRF, BET, XRD, FTIR, and SEM–EDX were utilized to characterize of CS-FA/Fe₃O₄ composite. The effects of adsorption process parameters namely adsorbent dose (A: 0.04–0.12 g), solution pH (B: 4–10), temperature (C: 30–50 °C), and time (E: 20–90 min) were optimized by using Box–Behnken design (BBD) in response surface methodology (RSM). The experimental results indicate that the highest RO16 removal was 73.1% by significant interaction between BC (p-value = 0.0002) and AD (p-value = 0.022). The optimum RO16 dye removal conditions were recorded at solution pH ~ 4, adsorbent dose (0.08 g), temperature (30 °C), and time (55 min). The adsorption process was well described by pseudo-second order (PSO) kinetic and Freundlich isotherm model. The adsorption capacity of CS-FA/Fe₃O₄ composite for RO16 dye was 66.9 mg/g at 30 °C. The mechanism of the RO16 dye adsorption included many interactions such as electrostatic, n–π interaction, H-bonding, and Yoshida H-bonding. Furthermore, the CS-FA/Fe₃O₄ composite exhibited a high ability to separate from the aqueous solution after adsorption process by external magnetic field.

中文翻译：

---

磁性壳聚糖-粉煤灰/ Fe 3 O 4复合材料的吸附活性橙16染料的合成：Box–Behnken设计的优化

摘要

磁性壳聚糖粉煤灰/ Fe ₃ O ₄（CS-FA / Fe ₃ O ₄）的杂化复合生物聚合物被制备为一种有效的复合生物吸附剂，用于从水性介质中去除活性橙16（RO16）染料。XRF，BET，XRD，FTIR和SEM-EDX等各种分析技术用于表征CS-FA / Fe ₃ O ₄综合。吸附过程参数的影响为吸附剂剂量（A：0.04-0.12 g），溶液pH（B：4-10），温度（C：30-50°C）和时间（E：20-90分钟）通过使用Box–Behnken设计（BBD）在响应面方法（RSM）中进行了优化。实验结果表明，通过BC（p值= 0.0002）和AD（p值= 0.022）之间的显着相互作用，最高的RO16去除率为73.1％。在溶液pH〜4，吸附剂量（0.08 g），温度（30°C）和时间（55分钟）下记录了最佳的RO16染料去除条件。吸附过程通过拟二级动力学（PSO）动力学和Freundlich等温线模型得到了很好的描述。CS-FA / Fe ₃ O ₄的吸附容量RO16染料的复合物在30°C下为66.9 mg / g。RO16染料的吸附机制包括许多相互作用，例如静电，n-π相互作用，H键和吉田H键。此外，CS-FA / Fe ₃ O ₄复合物在通过外部磁场进行吸附处理之后显示出与水溶液分离的高能力。