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首页> 外文期刊>Geology, Ecology, and Landscapes >Comparative analysis of floating and submerged macrophytes for heavy metal (copper, chromium, arsenic and lead) removal: sorbent preparation, characterization, regeneration and cost estimation
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Comparative analysis of floating and submerged macrophytes for heavy metal (copper, chromium, arsenic and lead) removal: sorbent preparation, characterization, regeneration and cost estimation

机译：浮游植物和沉水植物去除重金属（铜，铬，砷和铅）的比较分析：吸附剂的制备，表征，再生和成本估算

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摘要

In this study, a comparative evaluation of floating and submerged macrophytes was performed. Azolla filiculoides (free floating) and Hydrilla verticillata (submerged) aquatic macrophytes were utilized for arsenic, copper, chromium and lead removal from the respective metallic ion solutions. Batch experiments were performed initially with optimization of different physical parameters viz., pH, initial heavy metal concentration, biosorbent dosage, contact time, temperature and agitation speed. Submerged (Hydrilla verticillata ) had depicted better removal efficiency in comparison to the floating macrophyte (Azolla filiculoides ). Field emission scanning electron microscopy equipped with energy dispersive spectroscopy and Fourier transform infrared spectroscopy analysis was performed for the characterization of the metal loaded biosorbents. Biosorption of the respective heavy metal was clearly depicted in the FESEM-EDX spectrum, although not much change in the morphology of the biosorbents were examined. FTIR spectra of the biosorbents obtained after the experiments confirmed the involvement of C–H bend, –CH_(2)–(C=O), N–H, –C–O, R_(2)–C= bending and –C–C=O on the biomass. Furthermore, the biosorbent regeneration followed by heavy metal biosorption confirmed the reusability of the prepared biosorbent for at least two consecutive cycles without much significant change in the heavy metal biosorption capacity.
机译：在这项研究中，对漂浮和淹没的大型植物进行了比较评估。利用偶氮藻类（自由漂浮）和网状水生菌（淹没）水生植物从相应的金属离子溶液中去除砷，铜，铬和铅。最初进行批处理实验，优化了不同的物理参数，例如pH，初始重金属浓度，生物吸附剂量，接触时间，温度和搅拌速度。与漂浮的大型植物（偶氮假单胞菌）相比，淹没的（Hydrilla verticillata）具有更好的去除效率。进行了配备有能量色散光谱和傅里叶变换红外光谱分析的场发射扫描电子显微镜，以表征负载金属的生物吸附剂。在FESEM-EDX光谱中清楚地描绘了各个重金属的生物吸附，尽管检查的生物吸附剂形态没有太大变化。实验后获得的生物吸附剂的FTIR光谱证实了C–H弯曲，–CH_（2）–（C = O），NH––C–O，R_（2）–C =弯曲和–C的参与–C = O在生物质上。此外，生物吸附剂的再生接着重金属的生物吸附证实了所制备的生物吸附剂在至少两个连续的循环中的可重复使用性，而重金属的生物吸附能力没有太大的变化。

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