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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >2-Line ferrihydrite: Synthesis, characterization and its adsorption behaviour for removal of Pb(ii), Cd(ii), Cu(ii) and Zn(ii) from aqueous solutions
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2-Line ferrihydrite: Synthesis, characterization and its adsorption behaviour for removal of Pb(ii), Cd(ii), Cu(ii) and Zn(ii) from aqueous solutions

机译：两线水铁矿：水溶液中Pb（ii），Cd（ii），Cu（ii）和Zn（ii）的合成，表征及其吸附行为

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Nano-structured 2-line ferrihydrite was synthesized by a pH-controlled precipitation technique at 90°C. Chemical, X-ray diffraction (XRD), Fourier transform infrared (FTIR) and Raman analyses confirmed the sample to be 2-line ferrihydrite. The nano nature of the prepared sample was studied by transmission electron microscopy (TEM). The surface area obtained by the Brunauer-Emmett-Teller (BET) method was 175.8 m ~2 g ~(-1). The nanopowder so obtained was used to study its behaviour for the removal of Pb(ii), Cd(ii), Cu(ii) and Zn(ii) from aqueous solutions. The relative importance of experimental parameters such as solution pH, contact time and concentration of adsorbate on the uptake of various cations was evaluated. By increasing the pH from 2.0 to 5.5, adsorption of the four cations increased. The kinetics parameters were compared by fitting the contact time data to both linear as well as non-linear forms of pseudo-second-order models. Linear forms of both Langmuir and Freundlich models fitted the equilibrium data of all the cations except for Pb(ii) which was also fitted to the non-linear forms of both the models as it gave a low R ~2 value of 0.85 for the Langmuir model. High Langmuir monolayer capacities of 366, 250, 62.5 and 500 mg g ~(-1) were obtained for Pb(ii), Cd(ii), Cu(ii) and Zn(ii), respectively. Presence of chloride or sulfate had an adverse effect on cation adsorption. The interactive effects on adsorption from solutions containing two, three or four cations were studied. Surprisingly no Cd(ii) adsorption was observed in Pb(ii)-Cd(ii), Pb(ii)-Cd(ii)-Zn(ii) and Pb(ii)-Cd(ii)-Cu(ii)-Zn(ii) systems under the studied concentration range. The overall loading capacity of the adsorbent decreased in mixed cation systems. Metal ion loaded adsorbents were characterized by XRD, FTIR and Raman techniques. The high adsorption capability of the 2-lines ferrihydrite makes it a potentially attractive adsorbent for the removal of cations from aqueous solutions.
机译：通过在90°C下通过pH控制的沉淀技术合成了纳米结构的2线亚铁水合物。化学，X射线衍射（XRD），傅立叶变换红外（FTIR）和拉曼分析证实样品为2线亚铁水合物。通过透射电子显微镜（TEM）研究了所制备样品的纳米性质。通过Brunauer-Emmett-Teller（BET）方法获得的表面积为175.8 m〜2 g〜（-1）。如此获得的纳米粉用于研究其从水溶液中去除Pb（ii），Cd（ii），Cu（ii）和Zn（ii）的行为。评估了实验参数的相对重要性，例如溶液的pH值，接触时间和吸附物浓度对各种阳离子吸收的影响。通过将pH从2.0增加到5.5，四种阳离子的吸附增加。通过将接触时间数据拟合为伪二阶模型的线性和非线性形式来比较动力学参数。 Langmuir和Freundlich模型的线性形式都拟合了所有阳离子的平衡数据，但Pb（ii）也与这两个模型的非线性形式拟合，因为它给出了Langmuir的低R〜2值0.85模型。对于Pb（ii），Cd（ii），Cu（ii）和Zn（ii），分别获得了366、250、62.5和500 mg g〜（-1）的高Langmuir单层容量。氯化物或硫酸盐的存在对阳离子吸附有不利影响。研究了含有两个，三个或四个阳离子的溶液对吸附的相互作用。出人意料的是，在Pb（ii）-Cd（ii），Pb（ii）-Cd（ii）-Zn（ii）和Pb（ii）-Cd（ii）-Cu（ii）-中未观察到Cd（ii）吸附在研究浓度范围内的Zn（ii）系统。在混合阳离子体系中，吸附剂的总负载量下降。通过XRD，FTIR和拉曼技术对负载金属离子的吸附剂进行了表征。两线水铁矿的高吸附能力使其成为从水溶液中去除阳离子的潜在有吸引力的吸附剂。

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