Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

Siyu Xu, Li De, Haixin Guo, Haodong Lu, Mo Qiu, Jirui Yang and Feng Shen
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Siyu Xu: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, No. 31 Fukang Road, Nankai District, Tianjin 300191, China
Li De: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, No. 31 Fukang Road, Nankai District, Tianjin 300191, China
Haixin Guo: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, No. 31 Fukang Road, Nankai District, Tianjin 300191, China
Haodong Lu: Department of Chemical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
Mo Qiu: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, No. 31 Fukang Road, Nankai District, Tianjin 300191, China
Jirui Yang: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, No. 31 Fukang Road, Nankai District, Tianjin 300191, China
Feng Shen: Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, No. 31 Fukang Road, Nankai District, Tianjin 300191, China

IJERPH, 2022, vol. 19, issue 13, 1-16

Abstract: Adsorption is an efficient technology for removing phosphorus from wastewater to control eutrophication. In this work, MgO-modified biochars were synthesized by a solvent-free ball milling method and used to remove phosphorus. The MgO-modified biochars had specific surface areas 20.50–212.65 m 2 g −1 and pore volume 0.024–0.567 cm 3 g −1 . The as-prepared 2MgO/BC-450-0.5 had phosphorus adsorption capacities of 171.54 mg g −1 at 25 °C and could remove 100% of phosphorus from livestock wastewater containing 39.51 mg L − 1 phosphorus. The kinetic and isotherms studied show that the pseudo-second-order model ( R 2 = 0.999) and Langmuir models ( R 2 = 0.982) could describe the adoption process well. The thermodynamic analysis indicated that the adsorption of phosphorus on the MgO-modified biochars adsorbent was spontaneous and endothermic. The effect of pH, FTIR spectra and XPS spectra studies indicated that the phosphorus adsorption includes a protonation process, electrostatic attraction and precipitation process. This study provides a new strategy for biochar modification via a facile mechanochemical method.

Keywords: phosphorus adsorption; ball milling; biochar modification; magnesium oxide (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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