Amorphous phosphated titanium oxide with amino and hydroxyl bifunctional groups for highly efficient heavy metal removal,Environmental Science: Nano

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Amorphous phosphated titanium oxide with amino and hydroxyl bifunctional groups for highly efficient heavy metal removal
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-03-06 , DOI: 10.1039/c9en01466g
Peng Wang _{1,

2,

3,

4,

5} , Du Sun _{1,

2,

3,

4,

5} , Mingxia Deng _{1,

2,

3,

4,

5} , Shaoning Zhang _{1,

2,

3,

4,

5} , Qingyuan Bi _{1,

2,

3,

4,

5} , Wei Zhao _{1,

2,

3,

4,

5} , Fuqiang Huang _{1,

2,

3,

4,

5}

Affiliation

Heavy metal pollution in water has become one of the main environmental problems in society today. Currently, traditional adsorbents can hardly reduce the heavy metal content in wastewater to trace levels to meet the standards for drinking water. Thus, it is urgent to design and construct new adsorption materials for the effective removal of heavy metals from sewage to trace levels. Herein, functional amorphous phosphated titanium oxide (FAPTO), a new adsorbent containing anchored organic (–NH₂/–NH–) and inorganic (–OH) bifunctional groups on the surface, was synthesized via a simple one-pot solvothermal approach. The amino and hydroxyl groups within the matrix offer sorption sites for the capture of heavy metals. The obtained FAPTO effectively adsorbs heavy metals with uptake efficiency reaching 99.0%. FAPTO can remarkably reduce the Pb²⁺, Cd²⁺, Cr³⁺, and Fe³⁺ concentrations from ppm levels (∼5 mg L⁻¹) to ppb levels (0.001–0.04 mg L⁻¹), reaching the drinking water standards specified by the World Health Organization. Moreover, the Langmuir equilibrium isotherms indicate that the maximum sorption capacities of FAPTO for Pb²⁺, Cd²⁺, Cr³⁺, and Fe³⁺ are 761.3, 193.3, 255.2, and 166.1 mg g⁻¹, respectively. Importantly, FAPTO possesses excellent reusability with negligible degradation after multiple reuses. The as-prepared FAPTO is a promising absorbent for heavy metal removal by virtue of its outstanding adsorption performance and eco-friendly fabrication process.

中文翻译：

具有氨基和羟基双官能团的非晶态磷酸化二氧化钛，可高效去除重金属

水中的重金属污染已成为当今社会的主要环境问题之一。当前，传统的吸附剂几乎无法将废水中的重金属含量降低到痕量水平，无法满足饮用水标准。因此，迫切需要设计和建造新的吸附材料，以有效地去除污水中的重金属至痕量水平。在本文中，官能无定形磷酸化的氧化钛（FAPTO），含锚定有机（-NH新吸附剂₂的表面上/ -NH-）和无机（-OH）官能基团，合成了通过一种简单的一锅溶剂热法。基质中的氨基和羟基提供了用于捕获重金属的吸附位点。所获得的FAPTO有效吸附重金属，吸收效率达到99.0％。FAPTO可以将Pb 2 ⁺，Cd 2 ⁺，Cr ³⁺和Fe ^3+的浓度从ppm水平（〜5 mg L ^-1）显着降低到ppb水平（0.001-0.04 mg L ^-1），达到饮用水世界卫生组织规定的标准。此外，Langmuir平衡等温线表明FAPTO对Pb 2 ⁺，Cd 2 ⁺，Cr ³⁺和Fe ³⁺的最大吸附能力分别为761.3、193.3、255.2和166.1 mg g ^-1。重要的是，FAPTO拥有出色的可重复使用性，多次重复使用后的降解程度可忽略不计。如此制备的FAPTO凭借其出色的吸附性能和环保的制造工艺，成为去除重金属的有前途的吸收剂。

更新日期：2020-04-24

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