Purification of starch and phosphorus wastewater using core-shell magnetic seeds prepared by sulfated roasting

Chunjie Du; Jinsheng Yu; Wei Sun; Haisheng Han; Yuehua Hu; Pan Chen; Panpan Hou; Runqing Liu; Li Wang; Yue Yang; Ruohua Liu; Lei Sun

doi:10.1016/j.jes.2019.02.014

Purification of starch and phosphorus wastewater using core-shell magnetic seeds prepared by sulfated roasting

J Environ Sci (China). 2019 Jul:81:4-16. doi: 10.1016/j.jes.2019.02.014. Epub 2019 Feb 27.

Authors

Chunjie Du¹, Jinsheng Yu¹, Wei Sun¹, Haisheng Han², Yuehua Hu³, Pan Chen¹, Panpan Hou¹, Runqing Liu¹, Li Wang¹, Yue Yang¹, Ruohua Liu¹, Lei Sun¹

Affiliations

¹ School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China.
² School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China. Electronic address: hanhai5086@csu.edu.cn.
³ School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources, Central South University, Changsha 410083, China. Electronic address: hyh@csu.edu.cn.

PMID: 30975328
DOI: 10.1016/j.jes.2019.02.014

Abstract

Core-shell magnetic seeds with certain adsorption capacity that were prepared by sulfated roasting, served as the core of a magnetic separation technology for purification of starch wastewater. XRD and SEM results indicate that magnetite's surface transformed to be porous α-Fe₂O₃ structure. Compared with magnetite particles, the specific surface area was significantly improved to be 8.361 from 2.591 m²/g, with little decrease in specific susceptibility. Zeta potential, FT-IR and XPS experiments indicate that both phosphate and starch adsorbed on the surface of the core-shell magnetic seeds by chemical adsorption, which fits well with the Langmuir adsorption model. The porous surface structure of magnetic seeds significantly contributes to the adsorption of phosphate and starch species, which can be efficiently removed to be 1.51 mg/L (phosphate) and 9.51 mg/L (starch) using magnetic separation.

Keywords: Core-shell magnetic seeds; Phosphate; Purification; Starch; Sulfated roasting.

MeSH terms

Ferrosoferric Oxide / chemistry
Magnetics
Phosphorus / analysis*
Starch / analysis*
Sulfates / chemistry
Waste Disposal, Fluid / methods*
Wastewater / chemistry*
Water Pollutants, Chemical / analysis*

Substances

Sulfates
Waste Water
Water Pollutants, Chemical
Phosphorus
Starch
Ferrosoferric Oxide