Rose Bengal dye is a xanthene class [4, 5, 6, 7-tetrachloro-2', 4', 5', 7'-tetraiodofluorescein] compound with high molecular weight of 1016.7 g/mol. The leaves of Mangifera indica has been used to prepare a homogeneous powdered biosorbent for the removal of Rose Bengal dye from aqueous solution. Maximum dye uptake capacity is achieved for initial dye concentration of 20 mg/L at biosorbent dosage of 0.2 g at neutral pH. Scanning electron microscope (SEM) image, Energy Dispersive X-ray (EDX) and Fourier Transform Infrared (FTIR) spectra display changes in the morphological properties, elemental compositions and functional groups respectively before and after adsorption of RB dye on MI. The maximum monolayer adsorption capacity of MI for RB dye is found to be 0.824 mg per 0.2 g of adsorbent. Freundlich isotherm model best fits the experimental data compared to the results obtained from Langmuir-1 and Langmuir-2 model equations. The pseudo-second order model-1 best describe the kinetics of the adsorption of Rose Bengal dye on MI. The thermal degradation characteristics of Mangifera indica before and after adsorption are studied. The pyrolysis of dye adsorbed biomass at 900°C result in a total degradation of 93.15% with peak weight reduction of 0.0508 mg/min at 528°C.

中文翻译：

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使用得自印度芒果的生物吸附剂从水溶液中去除玫瑰红染料

玫瑰红染料是x吨类[4、5、6、7-四氯-2'，4'，5'，7'-四碘荧光素]化合物，具有1016.7 g / mol的高分子量。芒果的叶子已经用于制备均质粉末状生物吸附剂，用于从水溶液中去除孟加拉红染料。在中性p下生物吸附剂剂量为0.2 g时，初始染料浓度为20 mg / L时，可获得最大的染料吸收能力H.扫描电子显微镜（SEM）图像，能量色散X射线（EDX）和傅立叶变换红外（FTIR）光谱分别显示RB染料在MI上吸附前后的形态学特性，元素组成和官能团的变化。发现MI对RB染料的最大单层吸附容量为0.824 mg / 0.2 g吸附剂。与从Langmuir-1和Langmuir-2模型方程式获得的结果相比，Freundlich等温模型最适合实验数据。拟二级模型最好地描述了玫瑰红染料在MI上的吸附动力学。芒果的热降解特性研究吸附前后。染料吸附的生物质在900°C的热解导致总降解量为93.15％，在528°C时峰重降低了0.0508 mg / min。