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首页> 外文期刊>Journal of Hazardous Materials >Amorphous boron-doped sodium titanates hydrates: Efficient and reusable adsorbents for the removal of Pb2+ from water
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Amorphous boron-doped sodium titanates hydrates: Efficient and reusable adsorbents for the removal of Pb2+ from water

机译：非晶态硼掺杂钛酸钠水合物：高效且可重复使用的吸附剂，用于从水中去除Pb2 +

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摘要

Amorphous titanium hydroxide and boron-doped (B-doped) sodium titanates hydrates were synthetized and used as adsorbents for the removal of Pb2+ from water. The, use of sodium borohydride (NaBH4) and titanium(IV) isopropoxide (TTIP) as precursors permits a very easy synthesis of B-doped adsorbents at 298K. The new adsorbent materials were first chemically characterized (XRD, XPS, SEM, DRIFT and elemental analysis) and then tested in Pb2+ adsorption batch experiments, in order to define kinetics and equilibrium studies. The nature of interaction between such sorbent materials and Pb2+ was also well defined: besides a pure adsorption due to hydroxyl interaction functionalities, there is also an ionic exchange between Pb2+ and sodium ions even working at pH 4.4. Langmuir model presented the best fitting with a maximum adsorption capacity up to 385 mg/g. The effect of solution pH and common ions (i.e. Na+, Ca2+ and Mg2+) onto Pb2+ sorption were also investigated. Finally, recovery was positively conducted using EDTA. Very efficient adsorption (>99.9%) was verified even using tap water spiked with traces of Pb2+ (50 ppb). (C) 2016 Elsevier B.V. All rights reserved.
机译：合成了无定形氢氧化钛和掺硼（掺硼）的钛酸钠水合物，并用作吸附剂，用于从水中去除Pb2 +。硼氢化钠（NaBH4）和异丙醇钛（IV）（TTIP）的使用可以很容易地在298K合成B掺杂的吸附剂。首先对新的吸附剂材料进行化学表征（XRD，XPS，SEM，DRIFT和元素分析），然后在Pb2 +吸附批实验中进行测试，以定义动力学和平衡研究。此类吸附剂材料与Pb2 +之间相互作用的性质也得到了很好的定义：除了由于羟基相互作用功能而产生的纯吸附作用之外，Pb2 +与钠离子之间甚至在pH 4.4下也存在离子交换。 Langmuir模型提供了最合适的拟合，最大吸附量高达385 mg / g。还研究了溶液pH和常见离子（即Na +，Ca2 +和Mg2 +）对Pb2 +吸附的影响。最后，使用EDTA积极地进行了恢复。即使使用掺有痕量Pb2 +（50 ppb）的自来水，也证实了非常有效的吸附（> 99.9％）。 （C）2016 Elsevier B.V.保留所有权利。

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