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Constructing mesoporous phosphated titanium oxide for efficient Cr(III) removal.

Wang Peng1, Sun Du2, Zhang Shaoning2

  • 1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, PR China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China; School of Physical Science and Technology, ShanghaiTech University, Shanghai, 200031, PR China.

Journal of Hazardous Materials
|October 4, 2019
PubMed
Summary

This study introduces a novel phosphated titanium dioxide (PTO) adsorbent synthesized using a simple boiling water method for effective chromium(III) removal from wastewater. The optimized PTO demonstrates superior adsorption capacity and reusability, offering an eco-friendly solution for heavy metal remediation.

Keywords:
AdsorptionAdsorption capacityCr(III) ionHigh specific surface areaHydroxyl groupMesoporous 8-PTO

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Heavy metal contamination in wastewater poses significant environmental and health risks.
  • Nanostructured titanium dioxide (TiO2) shows potential as an adsorbent for heavy metal removal.
  • Developing efficient and eco-friendly adsorbents is crucial for effective wastewater treatment.

Purpose of the Study:

  • To synthesize mesoporous phosphated titanium dioxide (PTO) via a facile boiling water method.
  • To investigate the Cr(III) adsorption performance of the synthesized PTO in polluted water.
  • To explore the role of surface functional groups and structural properties in adsorption efficiency.

Main Methods:

  • A boiling water synthetic approach was employed to prepare mesoporous phosphated TiO2 (PTO) using varying molar ratios of H3PO4.
  • Characterization of the synthesized PTO included surface area analysis, size distribution, and pH of zero point of charge (pHzpc) determination.
  • Cr(III) adsorption experiments were conducted in sewage, followed by reusability tests.

Main Results:

  • Mesoporous 8-PTO (synthesized with 8% H3PO4) exhibited a high specific surface area (278 m²/g), narrow pore size (<5 nm), low pHzpc (~1.0), and abundant surface hydroxyl groups.
  • The optimized 8-PTO demonstrated superior Cr(III) adsorption capacity of up to 92 mg/g in sewage, outperforming existing TiO2 adsorbents.
  • The PTO adsorbent showed excellent reusability and thermal stability, with surface hydroxyl content directly correlating with adsorption capacity.

Conclusions:

  • The facile boiling water synthesis provides an effective route to produce high-surface-area mesoporous phosphated TiO2 for efficient Cr(III) removal.
  • The abundant surface hydroxyl groups on PTO play a critical role in the high adsorption capacity for Cr(III).
  • Mesoporous PTO is a promising, reusable, and environmentally friendly adsorbent for treating heavy metal-polluted wastewater.