DataSheet_1_Adsorption of toxic dye using red seaweeds from synthetic aqueous solution and its application to industrial wastewater effluents.pdf

This study investigated the potential application of dried powder from red seaweed Pterocladia capillacea as an eco-friendly adsorbent for removing Crystal Violet Dye (CV dye) from a synthetic solution. The adsorption conditions for the adsorbent were determined, in batch conditions, by changing different experimental parameters such as initial CV dye concentrations (5, 10, 20, 30, and 40 mg L–1), contact time (15, 30, 60, 120, and 180 min.), adsorbent doses (0.025, 0.05, 0.1, 0.2, and 0.3 g), temperature (25, 35, 45, and 55°C), and pH (3, 5, 7, 9, and 11). The adsorption mechanisms of CV dye onto the P. capillacea biomass were examined using various analytical techniques such as FTIR, BET, UV–Visible, and SEM. These characterizations suggest the average BET surface area of P. capillacea was 87.17 m2 g–1 and a pore volume of 0.10368 cc g−1. Moreover, according to the FTIR study, the dye has been deposited inside the adsorbent’s pores after adsorption. The adsorption behavior of the adsorbent was investigated by performing both kinetic and equilibrium isothermal studies in batch conditions at 25°C. Also, the thermodynamic factors showed the exothermic nature and physisorption of the adsorption process, which tends to be spontaneous at lower temperatures. In addition, Langmuir, Dubinin-Radushkevich, Freundlich, and Tempkin isotherm models were selected to evaluate the adsorption of CV dye on P. capillacea. The equilibrium adsorption data were best represented by the Freundlich, indicating multilayer adsorption on the heterogeneous surface. The qe experiment and calculation values for the Pseudo-Second-Order and interparticle diffusion kinetic models were determined. The results showed that, under optimum conditions P. capillacea exhibited 98% removal of CV dye from synthetic wastewater. Moreover, it will help to regenerate the adsorbents that can be reused to adsorb CV dye ions and develop a successful adsorption process. Finally, this study concluded that the dried powdered form of P. capillacea is an attractive source for adsorbing CV dye from aqueous solution.

本研究旨在探讨红海藻（Pterocladia capillacea）干粉作为环保型吸附剂从合成溶液中去除孔雀绿染料（CV染料）的潜在应用。通过改变实验参数，如初始CV染料浓度（5、10、20、30和40 mg L–1）、接触时间（15、30、60、120和180分钟）、吸附剂用量（0.025、0.05、0.1、0.2和0.3克）、温度（25、35、45和55°C）以及pH值（3、5、7、9和11），在批量条件下确定了吸附剂的吸附条件。利用傅里叶变换红外光谱（FTIR）、比表面积及孔径分析（BET）、紫外-可见光谱（UV-Visible）和扫描电子显微镜（SEM）等分析技术，对CV染料在P. capillacea生物量上的吸附机理进行了考察。这些表征表明，P. capillacea的平均BET比表面积为87.17 m2 g–1，孔隙体积为0.10368 cc g−1。此外，根据傅里叶变换红外光谱研究结果，染料在吸附后已被沉积在吸附剂的孔隙内部。通过在25°C的批量条件下进行动力学和平衡等温吸附实验，研究了吸附剂的吸附行为。热力学参数显示出吸附过程的放热性质和物理吸附特性，该过程在较低温度下趋于自发。此外，选用了Langmuir、Dubinin-Radushkevich、Freundlich和Tempkin等温线模型来评估CV染料在P. capillacea上的吸附。平衡吸附数据最符合Freundlich模型，表明在异质表面上存在多层吸附。通过伪二级动力学模型和颗粒间扩散动力学模型进行了qe实验和计算。结果表明，在最佳条件下，P. capillacea对合成废水中CV染料的去除率可达98%。此外，这将有助于再生吸附剂，使其能够重复使用吸附CV染料离子，并开发出成功的吸附工艺。最终，本研究得出结论，红海藻（P. capillacea）的干粉形式是吸附水溶液中CV染料的诱人来源。