Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 297, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.121516
Keywords
Clay; Reconstitution; Silicate adsorbent; Phosphate; Adsorption; Removal
Categories
Funding
- National Natural Science Foundation of China [22068027]
- Inner Mongolia Autonomous Region of China [CYYC11013, CCYCLJ202]
- Scientific Research Funding from Inner Mongolia University [12000-15031904, 21300-5205122]
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A novel phosphate adsorbent with excellent adsorption performance and low cost has been synthesized in this study, which can adapt to various environments and has high practical value.
High-performance phosphate adsorbents integrated with the advantages of excellent adsorption performance, low cost, strong adaptability, and environmental friendliness have always been desirable, because the existing rare earth-free adsorbents were confined to poor adsorption ability and the rare earth-based adsorbents were confined to high cost and waste of rare earth resources. Here, in line with the concept of from nature, for purifying nature, a novel cost-effective and robust phosphate adsorbent was synthesized from natural calciumrich clay (a very abundant and inexpensive raw material) by coupling the hydrothermal reaction with a simple pyrolysis process. The natural calcium-rich clay was firstly reacted with sodium silicate to form silicate precursor, which was then calcined to obtain superadsorbent with a number of available sites for capturing phosphates. The experimental adsorption capacity of the superadsorbent for phosphate is as high as 372.57 mg/g, which is 24.27 times that of raw clay, and is obviously superior to most other adsorbents. A satisfactory adsorption capacity was still attained in a broad pH range of 4 ~ 12. After adsorption with 3 g/L of the superadsorbent, 99.99% of the phosphate in the initial phosphate solution (200 mg/L) was removed. After adsorption with 4 g/L of the adsorbent, the phosphate in natural water (e.g., Yellow river water, seawater, Yangtze river water, and Tap water) can be almost completely removed, and the total P concentration in the actual phosphate solution can be reduced to below 0.01 mg/L, which is significantly better than the commercially available phosphorus adsorbents. The in-depth structural analysis of the adsorbent after adsorption revealed that the adsorption of phosphate on the superadsorbent was mainly driven by chemical complexation interactions.
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