Amin Farah, Talpur Farah Naz, Balouch Aamna, Samoon Muhammad Kashif, Afridi Hassan Imran, Surhio Muhammad Ali
National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan E-mail:
Centre for Pure and Applied Geology, University of Sindh, Jamshoro, 76080, Pakistan.
Water Sci Technol. 2018 Oct;78(5-6):1148-1158. doi: 10.2166/wst.2018.365.
In many parts of the world, cadmium metal concentration in drinking water is higher than some international guideline values. To reduce its level below the safety limit, a sustainable and environmental friendly approach is crucial. Thereby, present article introduce an efficient, non-pathogenic and a novel fungal biosorbent Pleurotus eryngii for the removal of Cd(II) ions from aqueous system. The efficiency of P. eryngii were improved and optimized by investigating many significant factors such as; pH, biosorbent dose, initial Cd(II) ion concentration, temperature and contact time. Maximum Cd(II) ions removal (99.9%) was achieved at pH 5.0, biosorbent dosage 0.2 g/10 mL, concentration 20 mg L, time 10 min and temperature 50 °C. The isotherm and kinetic models revealed bioremediation of Cd(II) ions as monolayer coverage with biosorption capacity of 1.51 mg g following pseudo second order reaction. Moreover, thermodynamic parameters such as ΔG°, ΔH°, and ΔS° showed that the removal of Cd(II) ions is spontaneous and endothermic in nature. Batch elution process revealed that the complete elution of Cd(II) ions from the biomass were achieved using 0.1 N HNO solution. The sorption efficiency decreased from 99.99 to 56.89% as the biomass were recycled up to five times. The efficiency of Cd(II) ions removal from real water samples lies between 85 and 90%. Fourier transform infrared (FTIR) spectrometry, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopic (EDS) and atomic force microscopic (AFM) analysis of fungal biomass confirmed that the Cd(II) ions were the most abundant species on the biomass surface after the sorption process.
在世界许多地区，饮用水中的镉金属浓度高于一些国际指导值。为了将其水平降低到安全限值以下，一种可持续且环境友好的方法至关重要。因此，本文介绍了一种高效、无致病性且新型的真菌生物吸附剂杏鲍菇，用于从水体系中去除Cd(II)离子。通过研究许多重要因素，如pH值、生物吸附剂剂量、初始Cd(II)离子浓度、温度和接触时间，提高并优化了杏鲍菇的效率。在pH 5.0、生物吸附剂剂量0.2 g/10 mL、浓度20 mg/L、时间10分钟和温度50℃时，实现了最大Cd(II)离子去除率（99.9%）。等温线和动力学模型表明，Cd(II)离子的生物修复为单层覆盖，遵循伪二级反应，生物吸附容量为1.51 mg/g。此外，热力学参数如ΔG°、ΔH°和ΔS°表明，Cd(II)离子的去除在本质上是自发的且吸热的。分批洗脱过程表明，使用0.1 N HNO溶液可实现Cd(II)离子从生物质中的完全洗脱。随着生物质循环使用多达五次，吸附效率从99.99%降至56.89%。从实际水样中去除Cd(II)离子的效率在85%至90%之间。对真菌生物质进行的傅里叶变换红外（FTIR）光谱、扫描电子显微镜（SEM）、能量色散X射线光谱（EDS）和原子力显微镜（AFM）分析证实，吸附过程后Cd(II)离子是生物质表面最丰富的物种。
