Magnetic mesoporous TiO2 microspheres for sustainable arsenate removal from acidic environments†,Inorganic Chemistry Frontiers

当前位置： X-MOL 学术 › Inorg. Chem. Front. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Magnetic mesoporous TiO2 microspheres for sustainable arsenate removal from acidic environments†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-07-11 00:00:00 , DOI: 10.1039/c8qi00588e
Yujuan Zhao _{1,

2,

3,

4,

5} , Changyao Wang _{1,

2,

3,

4,

5} , Shuai Wang _{1,

2,

3,

4,

5} , Chun Wang _{1,

2,

3,

4,

5} , Yupu Liu _{1,

2,

3,

4,

5} , Areej Abdulkareem Al-Khalaf _{6,

7,

8,

9,

10} , Wael N. Hozzein _{11,

12,

13,

14,

15} , Linlin Duan _{1,

2,

3,

4,

5} , Wei Li _{1,

2,

3,

4,

5} , Dongyuan Zhao _{1,

2,

3,

4,

5}

Affiliation

Carcinogenic arsenic pollution in ground water seriously threatens the health and lives of humans all over the world. It is highly desirable to fabricate new materials for sustainable arsenate removal with high capacities, stabilities and recyclabilities. In this study, we demonstrate that uniform magnetic core–shell structured Fe₃O₄@Resorcinol-Formaldehyde@mesoporous TiO₂ microspheres (denoted Fe₃O₄@RF@mTiO₂) can function as excellent adsorbents for the fast removal of arsenate (As^V) in acidic environments with very high efficiency. The mesoporous TiO₂ outer shell (50 nm in thickness) endows them with a high surface area of 337 m² g⁻¹ and a large pore volume of 0.42 cm³ g⁻¹, thus resulting in a fast adsorption rate (1.16 g mg⁻¹ h⁻¹) and a high adsorption capacity (up to 139 mg g⁻¹) calculated using the Langmuir model at a pH of 3. The inner Fe₃O₄ core (130 nm in diameter) makes separation facile from wastewater using a magnet. Moreover, the hydrophobic properties of the RF interlayer (10 nm in thickness) are increased after calcination at 200 °C, and this can protect the inner Fe₃O₄ cores against etching from acid solutions over long cycles. In addition, the study of the As^V adsorption mechanism on the core–shell mesoporous Fe₃O₄@RF@mTiO₂ microspheres shows the existence of electrostatic forces and surface complexation interactions between arsenate and partially crystallized TiO₂. Benefiting from all of these advantages, the multilayer magnetic core–shell structured design is expected to be a promising nanomaterial for long-term wastewater treatment.

中文翻译：

磁性介孔TiO ₂微球，可从酸性环境中可持续去除砷†

地下水中的致癌砷污染严重威胁着全世界人类的健康和生命。迫切需要制造具有高容量，稳定性和可回收性的可持续去除砷的新材料。在这项研究中，我们证明了均匀的磁核-壳结构的Fe ₃ O ₄ @间苯二酚-甲醛@介孔的TiO ₂微球（表示为Fe ₃ O ₄ @ RF @ mTiO ₂）可以作为快速去除砷酸盐的优良吸附剂（如^V）在酸性环境中具有非常高的效率。介孔TiO ₂外壳（厚度为50 nm）赋予它们337 m的高表面积² g^-1和0.42 cm³ g^-1的大孔体积，从而导致快速吸附速率（1.16 g mg^-1 h^-1）和高吸附容量（高达139 mg g^-1）计算得出pH为3时的Langmuir模型。内部的Fe₃ O_4内芯（直径130 nm）使得使用磁铁可以很容易地与废水分离。此外，RF中间层（厚度为10 nm）在200°C下煅烧后的疏水性增强，这可以保护内部Fe₃ O₄核免受酸溶液的长期腐蚀。另外，As^V的研究核-壳介孔Fe ₃ O ₄ @ RF @ mTiO ₂微球的吸附机理表明，砷酸盐和部分结晶的TiO ₂之间存在静电力和表面络合相互作用。受益于所有这些优点，多层磁核-壳结构设计有望成为一种用于长期废水处理的有前途的纳米材料。

更新日期：2018-07-11

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11