Journal
CHEMICAL ENGINEERING JOURNAL
Volume 380, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122375
Keywords
Wheat straw biochar; Phosphate removal; Quaternary chitosan; Lanthanum; Partition coefficient
Categories
Funding
- National Natural Science Foundation of China [U1612441]
- Sino-Israeli Intergovernmental Scientific and Technological Cooperation Project [2015DFG92450]
- Opening Fund of the State Key Laboratory of Environmental Geochemistry [SKLEG2016905]
- Chinese Academy of Sciences
- Xinjiang Autonomous Region
- China Scholarship Council
- United States National Science Foundation [1561427]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1561427] Funding Source: National Science Foundation
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Herein, we explored the modification of wheat straw biochar with chitosan, quaternary ammonium salt, and lanthanum for enhanced phosphate removal in environmentally relevant conditions. Specifically, a new amine protected cross-linking method was utilized to modify the absorbent material for maximum adsorption capacity, reaching 109 +/- 4 mg P g(-1). The high phosphate removal performance of the composite was not significantly affected in a broad range of temperature (15-45 degrees C) and pH (2.5-7). 30 min allowed reaching a 100% adsorption equilibrium for 100 mg P L-1, and 93% for 25 mg P L-1, thus, significantly reducing the treatment time compared to previous reports. The highest partition coefficient 172.1 mg g(-1) mu M-1 was obtained at a concentration of 25 mg L-1, and the phosphorus removal rate was as high as 99.98%, indicating La/GTB have great adsorption performance at low phosphate concentration. The adsorption mechanisms of the composite are extensively described, where electrostatic interaction, ligand exchange, and Lewis acid-base interaction contribute to the process. All of the above-mentioned advantages make the prepared composite of great interest for the development of materials for on-site phosphate removal.
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