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首页> 外文期刊>Applied Surface Science >One-step synthesis of magnetite core/zirconia shell nanocomposite for high efficiency removal of phosphate from water
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One-step synthesis of magnetite core/zirconia shell nanocomposite for high efficiency removal of phosphate from water

机译：磁铁矿核/氧化锆壳纳米复合材料的一步合成，可高效去除水中的磷酸盐

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摘要

A self-assembled magnetite core/zirconia shell (Fe3O4@ZrO2) nanoparticle material was fabricated by the one-step co-precipitation method to capture phosphate from water. Fe3 04@ZrO2 with different Fe/Zr molar ratios were obtained and characterized by XRD, TEM, BET surface area and magnetization. It was shown that, with the decreasing of Fe/Zr molar ratio, magnetization decreased whereas surface area and adsorption capacity of phosphate increased. Fe3O4@ZrO2 with the ratio of higher than 4:1 had satisfactory magnetization property (>23.65 emu/g), enabling rapid magnetic separation from water and recycle of the spent adsorbent. The Langmuir adsorption capacity of Fe3O4@ZrO2 reached 27.93-69.44 mg/g, and the adsorption was fast (90% of phosphate removal within 20 min). The adsorption decreases with increasing pH, and higher ionic strength caused slight increase in adsorption at pH > about 5.5. The presence of chloride, nitrate and sulfate anions did not bring about significant changes in adsorption. As a result, Fe3O4@ZrO2 performed well to remove phosphate from real wastewater. These results were interpreted by the ligand exchange mechanism, i.e., the direct coordination of phosphate onto zirconium by replacement of hydroxyl groups. Results suggested that phosphate reacted mainly with surface hydroxyl groups but diffusion into interior of zirconia phase also contributed to adsorption. The adsorbed phosphate could be desorbed with a NaOH treatment and the regenerated Fe3O4@ZrO2 could be repeatedly used. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过一步共沉淀法制备了自组装磁铁矿核/氧化锆壳（Fe3O4 @ ZrO2）纳米粒子材料，用于从水中捕获磷酸盐。得到了不同Fe / Zr摩尔比的Fe3O4 @ ZrO2，并通过XRD，TEM，BET比表面积和磁化强度进行了表征。结果表明，随着Fe / Zr摩尔比的降低，磁化强度降低，而磷酸盐的表面积和吸附容量增加。 Fe3O4 @ ZrO2的比例大于4：1时，具有令人满意的磁化性能（> 23.65 emu / g），可以快速从水中进行磁分离，并回收利用过的吸附剂。 Fe3O4 @ ZrO2的Langmuir吸附容量达到27.93-69.44 mg / g，吸附速度很快（20分钟内磷酸盐去除率达到90％）。吸附随着pH的增加而降低，较高的离子强度导致pH> 5.5时的吸附略有增加。氯离子，硝酸根和硫酸根阴离子的存在并未引起吸附的显着变化。结果，Fe3O4 @ ZrO2在去除真实废水中的磷酸盐方面表现良好。这些结果由配体交换机制解释，即通过取代羟基将磷酸盐直接配位到锆上。结果表明，磷酸盐主要与表面羟基反应，但扩散到氧化锆相内部也有助于吸附。吸附的磷酸盐可以用NaOH处理解吸，并且再生的Fe3O4 @ ZrO2可以重复使用。 （C）2016 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2016年第15期|67-77|共11页
  • 作者

    Wang Zhe; Xing Mingchao; Fang Wenkan; Wu Deyi;

  • 作者单位

    Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Magnetite; Zirconia; Phosphate; Removal; Mechanism; Nanoparticles;

    机译：磁铁矿;锆石;磷酸盐;去除;机理;纳米颗粒;

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