4.7 Article

Different La/Fe oxide composites for efficient phosphate removal from wastewater: Properties and mechanisms

Journal

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2022.107329

Keywords

La; Fe oxide composites; Adsorption; Phosphate; Property; Mechanism

Funding

  1. National Key Research and Development Program of China [2017YFD0800403]
  2. Central Public-interest Scientific Institution Basal Research Fund [Y2022XC18]
  3. Major Science and Technology Special Plan of Yunnan Province [202102AE090011]
  4. Yunnan Fundamental Research Projects [202101AT070002]

Ask authors/readers for more resources

This study investigated the effects of different La/Fe oxide composites on phosphate adsorption. The results showed that temperature, specific surface area, and crystal type were the main factors affecting adsorption capacity, while pH and the addition of CO3(2-) had a negative impact on adsorption capacity. The adsorption mechanism involved surface precipitation, electrostatic attraction, and complexation.
Metal oxides are widely used in the removal of oxygen-containing anions from the aqueous phase, and multi metallic oxides were promising adsorbents for removal performance. In order to explore the effect of different La/Fe oxide composites (LF) on phosphate adsorption, three bimetallic composite oxides of La/Fe were prepared by citric acid sol-gel method at 600, 700 and 800 C-o (named LF-600, LF-700 and LF-800). According to adsorption experiments, the adsorption capacity was changed obviously with the temperature increasing. The maximum adsorption capacity was 77.08, 41.17 and 14.58 mg g(-1) at pH 7.0 of LF-600, LF-700 and LF-800, respectively. The specific surface area (S-BET) and the crystal type are the main factors affecting the adsorption capacity. With the temperature increasing, the S-BET reduced and the crystal phase was LaOCl and Fe(2)O(3 )of LF600, LaOCl, LaFeO(3 )and Fe2O3 of LF-700, and LaFeO3 and LaOCl of LF-800. In addition, the adsorption capacities decreased obviously with the increase of pH and the addition of CO3(2-). The FTIR, XRD and XPS analysis proved that the adsorption mechanism mainly was surface precipitation, electrostatic attraction and complexation, and complexation was the main adsorption mechanism.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available