Synergistic removal of acid red 73 dye from wastewater using a novel chitosan–blue-green algae composite: adsorption and photocatalytic degradation

IF 2.1 4区 综合性期刊 Q2 MULTIDISCIPLINARY SCIENCES
Ahmed E. Alprol, Mohamed Abdelraouf El‑Sheikh, Eslam M. Abdel-Salam, Hanan M. Khairy
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Abstract

This study investigates the synthesis and characterization of a novel chitosan–blue-green algae (BGA) composite adsorbent for the efficient removal of Acid Red 73 (AR73) dye from wastewater. The composite was characterized using Fourier transform infrared, zeta potential, an energy-dispersive X-ray analysis, and scanning electron microscopy analyses, revealing the presence of functional groups crucial for dye adsorption and a rough surface morphology indicative of high surface area. Batch adsorption experiments were conducted to evaluate the influence of pH, adsorbent dosage, contact time, and initial dye concentration on AR73 removal. The composite exhibited optimal adsorption at pH 6, with increasing removal efficiency observed with increasing adsorbent dosage and contact time until equilibrium was reached. The adsorption process followed pseudo-second-order kinetics, suggesting chemisorption as the dominant mechanism. In addition, the Freundlich isotherm model best described the adsorption process, suggesting a heterogeneous adsorption mechanism. The composite demonstrated good adsorption capacity (Qm = 142.86 mg/g) in the Langmuir model. The thermodynamic data strongly indicate that the removal process occurs through a physisorption process, and endothermic. Furthermore, the composite demonstrated photocatalytic activity under direct sunlight, effectively degrading AR73 dye and achieving complete removal at higher initial concentrations. The reusability of the composite was also investigated, showing sustained removal efficiency over two cycles, but a significant decrease in the third cycle. Finally, the application of the composite in treating aquaculture wastewater resulted in significant improvements in water quality parameters, including reduced turbidity, nitrate levels, and salinity. This study highlights the potential of the chitosan–BGA composite as a sustainable and efficient adsorbent and photocatalyst for dye removal and wastewater treatment.

Graphical Abstract

Abstract Image

利用新型壳聚糖-蓝绿藻复合材料协同去除废水中的酸性红 73 染料:吸附与光催化降解
本研究调查了一种新型壳聚糖-蓝绿藻(BGA)复合吸附剂的合成和表征,该吸附剂可有效去除废水中的酸性红 73(AR73)染料。利用傅立叶变换红外光谱、ZETA 电位、能量色散 X 射线分析和扫描电子显微镜分析对该复合材料进行了表征,结果表明存在对染料吸附至关重要的官能团,且表面形态粗糙,表明其具有较高的比表面积。批量吸附实验评估了 pH 值、吸附剂用量、接触时间和初始染料浓度对 AR73 去除率的影响。该复合材料在 pH 值为 6 时表现出最佳吸附效果,随着吸附剂用量和接触时间的增加,去除效率不断提高,直至达到平衡。吸附过程遵循伪二阶动力学,表明化学吸附是主要机制。此外,Freundlich 等温线模型最好地描述了吸附过程,表明这是一种异质吸附机制。在 Langmuir 模型中,该复合材料表现出良好的吸附能力(Qm = 142.86 mg/g)。热力学数据有力地表明,去除过程是一个物理吸附过程,而且是内热过程。此外,该复合材料在阳光直射下表现出光催化活性,可有效降解 AR73 染料,并在较高初始浓度下实现完全去除。此外,还对该复合材料的可重复使用性进行了研究,结果表明其去除效率在两个周期内保持不变,但在第三个周期内显著下降。最后,在应用该复合材料处理水产养殖废水时,水质参数得到了显著改善,包括浊度、硝酸盐含量和盐度都有所降低。这项研究凸显了壳聚糖-BGA 复合材料作为一种可持续的高效吸附剂和光催化剂在染料去除和废水处理方面的潜力。
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来源期刊
Rendiconti Lincei-Scienze Fisiche E Naturali
Rendiconti Lincei-Scienze Fisiche E Naturali MULTIDISCIPLINARY SCIENCES-
CiteScore
4.10
自引率
10.00%
发文量
70
审稿时长
>12 weeks
期刊介绍: Rendiconti is the interdisciplinary scientific journal of the Accademia dei Lincei, the Italian National Academy, situated in Rome, which publishes original articles in the fi elds of geosciences, envi ronmental sciences, and biological and biomedi cal sciences. Particular interest is accorded to papers dealing with modern trends in the natural sciences, with interdisciplinary relationships and with the roots and historical development of these disciplines.
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