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首页> 外文期刊>RSC Advances >Natural polysaccharides leading to super adsorbent hydroxyapatite nanoparticles for the removal of heavy metals and dyes from aqueous solutions
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Natural polysaccharides leading to super adsorbent hydroxyapatite nanoparticles for the removal of heavy metals and dyes from aqueous solutions

机译：导致超吸附羟基磷灰石纳米颗粒的天然多糖用于从水溶液中除去重金属和染料

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Water pollution has created a major impact on the environment mainly due to contaminated industrial effluents with toxic substances such as heavy metals and textile dyes. Therefore finding effective methodologies for their removal are extremely important. Hydroxyapatite (HAp) is a biocompatible material and has been widely used in many biological and industrial applications. This study involves the synthesis of porous HAp polymer nanocomposites using chitosan (CTS@HAp) and carboxymethyl cellulose (CMC@HAp) to develop a potential adsorbent with high adsorption capacity for heavy metals and textile dyes. A facile in situ synthetic approach was followed to obtain nanoparticles without calcination or freeze drying. X-ray diffraction, Fourier transform infra-red spectroscopy, scanning electron microscopy, thermogravimetric analysis, X-ray fluorescence spectroscopy and BET surface area characterization techniques were applied to elucidate the crystallinity, surface chemistry, morphology and surface area of HAp nanoparticles. This simple approach has produced 25–30 nm and 10 nm spherical nanoparticles of HAp in the presence of chitosan (CTS) and carboxymethyl cellulose (CMC) respectively. These nanocomposites were used for the removal of Pb( II ) ions and an industrial dye waste, acid yellow 220. The equilibrium sorption data were fitted according to the Freundlich and Langmuir isotherm models. For the CMC@HAp system the equilibrium for adsorption was achieved in 3 min, while CTS@HAp system required only 30 seconds. The maximum Pb( II ) ion adsorption capacity ( q _(m) ) was found to be 625.0 mg g ~(?1) and 909.1 mg g ~(?1) for CMC@HAp and CTS@HAp respectively. In the case of acid yellow 220, the equilibrium for adsorption was achieved in 90 minutes and 45 minutes for CMC@HAp and CTS@HAp respectively. The maximum acid yellow 220 adsorption capacity ( q _(m) ) was found to be 200 mg g ~(?1) and 303 mg g ~(?1) for CMC@HAp and CTS@HAp respectively. Therefore this study has highlighted the possibility of developing a HAp nanocomposite material for the efficient and effective removal of both Pb( II ) ions and acid yellow 220 from aqueous system.
机译：水污染对环境产生了重大影响，主要是由于污染的工业污染有毒物质，如重金属和纺织染料。因此，寻找其去除的有效方法非常重要。羟基磷灰石（HAP）是一种生物相容性材料，已广泛用于许多生物和工业应用。该研究涉及使用壳聚糖（CTS @ HAP）和羧甲基纤维素（CMC @ HAP）合成多孔HAP聚合物纳米复合材料，以产生具有高吸附能力的潜在吸附剂，用于重金属和纺织染料。遵循一种易于原位合成方法，得到无需煅烧或冷冻干燥的纳米颗粒。 X射线衍射，傅里叶变换红外光谱，扫描电子显微镜，热重分析，X射线荧光光谱和BET表面积表征技术才能阐明HAP纳米粒子的结晶度，表面化学，形态学和表面积。这种简单的方法分别在壳聚糖（CTS）和羧甲基纤维素（CMC）存在下产生25-30nm和10nm球形纳米颗粒。这些纳米复合材料用于去除PB（II）离子和工业染料废物，酸黄220.根据Freundlich和Langmuir等温模型安装平衡吸附数据。对于CMC @ HAP系统，在3分钟内实现吸附的平衡，而CTS @ HAP系统只需要30秒。发现最大PB（II）离子吸附容量（Q _（m））分别为CMC @ HAP和CTS @ HAP的625.0mg g〜（Δ1）和909.1mg g〜（Δ1）。在酸性黄220的情况下，分别在90分钟和45分钟内实现吸附的平衡分别为CMC @ HAP和CTS @ Hap。发现最大酸黄220吸附容量（Q _（m））分别为CMC @ HAP和CTS @ HAP的200mg g〜（α1）和303mg g〜（Δ1）。因此，该研究强调了开发HAP纳米复合材料的可能性，用于从水性体系中有效和有效地去除Pb（II）离子和酸性黄220。

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