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首页> 外文期刊>J: Open access Journal of multidisciplinary science >Adsorptive and Coagulative Removal of Trace Metals from Water Using Surface Modified Sawdust-Based Cellulose Nanocrystals
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Adsorptive and Coagulative Removal of Trace Metals from Water Using Surface Modified Sawdust-Based Cellulose Nanocrystals

机译：使用表面改性锯末纤维素纳米晶体从水中吸附和凝固除去痕量金属

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The presence of toxic metals in surface and natural waters, even at trace levels, poses a great danger to humans and the ecosystem. Although the combination of adsorption and coagulation techniques has the potential to eradicate this problem, the use of inappropriate media remains a major drawback. This study reports on the application of NaNO2/NaHCO3 modified sawdust-based cellulose nanocrystals (MCNC) as both coagulant and adsorbent for the removal of Cu, Fe and Pb from aqueous solution. The surface modified coagulants, prepared by electrostatic interactions, were characterized using Fourier transform infrared, X-ray diffraction (XRD), and scanning electron microscopy/energy-dispersive spectrometry (SEM/EDS). The amount of coagulated/adsorbed trace metals was then analysed using inductively coupled plasma atomic emission spectroscopy (ICP-AES). SEM analysis revealed the patchy and distributed floccules on Fe-flocs, which was an indication of multiple mechanisms responsible for Fe removal onto MCNC. A shift in the peak position attributed to C2H192N64O16 from 2θ = 30 to 24.5° occurred in the XRD pattern of both Pb- and Cu-flocs. Different process variables, including initial metal ions concentration (10–200 mg/L), solution pH (2–10), and temperature (25–45 °C) were studied in order to investigate how they affect the reaction process. Both Cu and Pb adsorption followed the Langmuir isotherm with a maximum adsorption capacity of 111.1 and 2.82 mg/g, respectively, whereas the adsorption of Fe was suggestive of a multilayer adsorption process; however, Fe Langmuir maximum adsorption capacity was found to be 81.96 mg/g. The sequence of trace metals removal followed the order: Cu Fe Pb. The utilization of this product in different water matrices is an effective way to establish their robustness.
机译：在表面和天然水域的有毒金属的存在，即使含量很低，造成对人类和生态系统有很大的危险。虽然吸附和凝聚技术相结合具有根除这一问题的可能性，使用不合适的介质仍然是一个主要的缺点。上的NaNO 2 /碳酸氢钠的应用本研究报告改性锯末基于纤维素纳米晶体（MCNC）既是凝结剂和吸附剂用于从水溶液中去除铜，铁和铅。表面改性的凝结剂，通过静电相互作用来制备，使用傅里叶变换红外，X射线衍射（XRD）的扫描电子显微镜/能量分散光谱法（SEM / EDS）表征。量凝固/吸附的痕量金属然后使用电感耦合等离子体原子发射光谱法（ICP-AES）分析。 SEM分析显示对Fe-絮凝物的片状和絮状分布，这是负责去除Fe到MCNC多种机制的指示。在从2θ= 30归因于C2H192N64O16至24.5°的峰值位置的偏移发生在有铅和Cu-絮凝物的XRD图案。不同的工艺变量，包括初始的金属离子浓度（10-200毫克/升），溶液的pH值（2-10），和温度（25-45℃），以研究它们如何影响该反应过程进行了研究。两个铜和铅吸附符合Langmuir等温线的111.1和2.82的最大吸附容量毫克/克，分别，而Fe的吸附是暗示的多层吸附过程;然而，铁朗缪尔最大吸附能力被发现是81.96毫克/克。痕量金属去除的序列，随后的次序：铜＆GT;的Fe＆GT; PB。在不同的水基体本产品的使用是建立他们的鲁棒性的有效途径。

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