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首页> 外文期刊>RSC Advances >Synthesis of potential biosorbent from used stevia leaves and its application for malachite green removal from aqueous solution: kinetics, isotherm and regeneration studies
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Synthesis of potential biosorbent from used stevia leaves and its application for malachite green removal from aqueous solution: kinetics, isotherm and regeneration studies

机译：用过的甜叶菊叶合成潜在的生物吸附剂及其在水溶液中去除孔雀石绿的应用：动力学，等温线和再生研究

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摘要

To develop a highly efficient, low-cost adsorbent from waste materials, powdered activated carbon (AC) was synthesized from used stevia leaves post the extraction of the glycosides used for producing a natural sweetener. The modification of the chemical characteristics of the biosorbent surface was achieved by impregnating it with sodium hydroxide (NaOH) at two different weight ratios. The AC biosorbent was applied for the removal of hazardous dye malachite green from an aqueous solution and the effects of the key operating parameters, such as initial dye concentration, agitation time, adsorbent dosage, solution pH, and the presence of electrolyte on the dye removal efficiency, were analyzed. The adsorption data were fitted to different isotherm and kinetic models to predict the adsorption mechanism. The Freundlich isotherm model showed the best fit to the adsorption equilibrium data and the adsorption kinetics followed a pseudo-second order model. A thermodynamic study was carried out and the data showed the endothermic and non-spontaneous nature of the process in the studied temperature range. The high adsorption efficiency shown after the regeneration studies indicated the high potential for the adsorbent to be used as a highly efficient, low-cost biosorbent.
机译：为了从废料中开发出一种高效，低成本的吸附剂，在提取用于生产天然甜味剂的糖苷后，从用过的甜叶菊叶中合成粉末状活性炭（AC）。通过用两种不同重量比的氢氧化钠（NaOH）浸渍生物吸附剂表面，可以实现生物吸附剂表面化学特性的改变。 AC生物吸附剂用于从水溶液中去除有害染料孔雀石绿，以及关键操作参数的影响，例如初始染料浓度，搅拌时间，吸附剂用量，溶液pH值以及电解质对染料去除的影响效率，进行了分析。将吸附数据拟合到不同的等温线和动力学模型以预测吸附机理。 Freundlich等温模型显示出最适合吸附平衡数据，并且吸附动力学遵循伪二级模型。进行了热力学研究，数据显示了所研究温度范围内该过程的吸热和非自发性质。再生研究后显示的高吸附效率表明该吸附剂被用作高效，低成本生物吸附剂的潜力很大。

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