Water, Air, & Soil Pollution

, 226:306

Phosphate Adsorption onto Granular-Acid-Activated-Neutralized Red Mud: Parameter Optimization, Kinetics, Isotherms, and Mechanism Analysis

Article

DOI: 10.1007/s11270-015-2577-1

Cite this article as:
Ye, J., Cong, X., Zhang, P. et al. Water Air Soil Pollut (2015) 226: 306. doi:10.1007/s11270-015-2577-1

Abstract

Powdered-acid-activated-neutralized red mud (Aan-RM), the chemico-physically modified product of red mud, was for the first time employed with hydroxypropyl methylcellulose and powdered straw as the main ingredients for granular Aan-RM production for phosphate removal. In order to better understand the phosphate adsorption characteristics of granular Aan-RM, the influence of operational parameters on the performance of granular Aan-RM and the possible adsorption mechanisms involved were investigated. The results demonstrated that the adsorbent dosage, adsorption temperature, and initial solution pH influenced the adsorption performance of granular Aan-RM significantly. The maximum phosphate adsorption capacity of granular Aan-RM reached 153.227 mg/g with the granular Aan-RM dosage of 3.0 g/L, adsorption temperature of 40 °C, and initial solution pH of 6.0. The whole adsorption process was well described by nth-order kinetic model and Langmuir–Freundlich isotherm. Meanwhile, X-ray photoelectron spectroscopy (XPS) analysis of P 2p peak on granular Aan-RM after phosphate adsorption demonstrated that 79.01 % of the phosphate was adsorbed through precipitation and ion exchange mechanisms with strong chemical bonds, and 20.99 % of the phosphate was adsorbed through surface deposition mechanism with weak chemical bonds.

Keywords

Red mud Granule Phosphate adsorption Precipitation Surface deposition 

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Jie Ye
    • 1
    • 2
    • 3
  • Xiangna Cong
    • 4
  • Panyue Zhang
    • 1
    • 2
  • Erhard Hoffmann
    • 3
  • Guangming Zeng
    • 1
    • 2
  • Yan Wu
    • 1
    • 2
  • Haibo Zhang
    • 1
    • 2
  • Wei Fan
    • 1
    • 2
  1. 1.College of Environmental Science and EngineeringHunan UniversityChangshaPeople’s Republic of China
  2. 2.Key Laboratory of Environmental Biology and Pollution Control, Ministry of EducationHunan UniversityChangshaPeople’s Republic of China
  3. 3.Department of Aquatic Environmental EngineeringKarlsruhe Institute of TechnologyKarlsruheGermany
  4. 4.The Institute for Applied Materials IAM-WK, Karlsruhe Institute of TechnologyKarlsruheGermany

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