Synthesis of rod-like hydroxyapatite with high surface area and pore volume from eggshells for effective adsorption of aqueous Pb(II)
Synthesis of rod-like hydroxyapatite with high surface area and pore volume from eggshells for effective adsorption of aqueous Pb(II)
复制标题
从蛋壳中合成具有高比表面积和孔容的棒状羟基磷灰石以有效吸附水性 Pb(II)
DOI：
10.1016/j.materresbull.2014.11.023
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发表时间：
2015-02-01
影响因子：
5.4
通讯作者：
Li, Jun
中科院分区：
文献类型：
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作者：
Ibrahim, Abdul-Rauf;Zhou, Yulan;Li, Jun
我们报道了在室温下从废蛋壳（分解为 CaO）和磷酸中合成棒状羟基磷灰石纳米粉末，无需控制 pH 值。该过程涉及使用注射泵来控制磷酸的添加速率，以维持稳定的 pH 值。结果表明，在不同的添加率下可以生产出纯的、棒状的和纳米尺寸的羟基磷灰石颗粒。此外，以200ml/h的添加速率获得的样品表现出较大的表面积(160.1m(2)/g)和孔体积(1.0cm(3)/g)。因此，所制备的羟基磷灰石和之前作为吸附剂生产的羟基磷灰石对水溶液中的 Pb2+ 表现出快速的吸附速率（10 分钟）以及非常高的最大吸附量（q（m）分别 = 994.5 mg/g 和 1000.5 mg/g）。此外，吸附过程呈现准二级反应模型，平衡吸附可以用Langmuir模型描述。 (C) 2014 Elsevier Ltd. 保留所有权利。
We report the synthesis of rod-like hydroxyapatite nanopowder from waste eggshells (decomposed to CaO) and phosphoric acid at room temperature without pH control. The procedure involves the use of a syringe pump to control the addition rate of the phosphoric acid in order to maintain a stable pH. Results revealed that pure, rod-like, and nano-size hydroxyapatite particles were produced at various addition rates. Moreover, the sample obtained from 200 ml/h addition rate exhibited large surface area (160.1 m(2)/g) and pore volume (1.0 cm(3)/g). Consequently, the prepared hydroxyapatite and that previously produced as adsorbents showed fast adsorption rates (10 min) as well as very high maximum adsorption (q(m) = 994.5 mg/g and 1000.5 mg/g, respectively) for Pb2+ in aqueous solution. Furthermore, the adsorption process revealed a pseudo-second-order reaction model and the equilibrium adsorption could be described by Langmuir model. (C) 2014 Elsevier Ltd. All rights reserved.