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Biosorption of Cr(vi) from aqueous solution using dormant spores of Aspergillus niger

机译：黑曲霉休眠孢子对水溶液中Cr（vi）的生物吸附

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Spores of Aspergillus niger (denoted as A. niger ) were used as a novel biosorbent to remove hexavalent chromium from aqueous solution. The effects of biosorbent dosage, pH, contact time, temperature and initial concentration of Cr( VI ) on its adsorption removal were examined in batch mode. The Cr( VI ) uptake capacity increased with an increase in Cr( VI ) concentration until saturation, which was found to be about 97.1?mg g ~(?1) at pH 2.0, temperature of 40 °C, adsorbent dose of 2.0 g L ~(?1) and initial concentration of 300 mg L ~(?1) . Scanning electron microscopy, energy dispersive X-ray spectroscopy, field-emission transmission electron microscopy (FETEM), XPS and Fourier-transform infrared spectroscopy were applied to study the microstructure, composition and chemical bonding states of the biomass adsorbent before and after spore adsorption. The mechanisms of chromate anion removal from aqueous solution by the spores of A. niger were proposed, which included adsorption of Cr( VI ) onto the spores followed by its reduction to Cr( III ). The reduced Cr( III ) was rebound to the biomass mainly through complexation mechanisms, redox reaction and electrostatic attraction. The removal of Cr( VI ) by spores of A. niger followed pseudo-second-order adsorption kinetics. Monolayer adsorption of Cr( VI ) was revealed by the better fitting of the Langmuir model isotherm rather than multilayer adsorption for the Freundlich model. The results indicated that A. niger spores can be used as a highly efficient biosorbent to remove Cr( VI ) from contaminated water.
机译：黑曲霉（称为黑曲霉）的孢子用作新型生物吸附剂，可从水溶液中去除六价铬。以分批方式研究了生物吸附剂量，pH，接触时间，温度和六价铬初始浓度对其吸附去除的影响。 Cr（VI）的吸收能力随Cr（VI）浓度的增加而增加，直至饱和，在pH 2.0，温度40°C，吸附剂剂量2.0 g的条件下，其吸收量约为97.1 µg g〜（？1）。 L〜（？1）和初始浓度为300 mg L〜（？1）。扫描电子显微镜，能量色散X射线光谱，场发射透射电子显微镜（FETEM），XPS和傅立叶变换红外光谱研究了孢子吸附前后生物质吸附剂的微观结构，组成和化学键合状态。提出了黑曲霉孢子从水溶液中去除铬酸根阴离子的机理，包括将Cr（VI）吸附到孢子上，然后还原为Cr（III）。还原的Cr（III）主要通过络合机理，氧化还原反应和静电吸引作用反弹回生物质。黑曲霉孢子对Cr（VI）的去除遵循伪二级吸附动力学。通过更好地拟合Langmuir模型等温线，而不是使用Freundlich模型的多层吸附，揭示了Cr（VI）的单层吸附。结果表明，黑曲霉孢子可用作高效生物吸附剂，用于从污染水中去除Cr（VI）。

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