Work

Enhanced Cr(VI) Removal from Landfill Leachates Using Nanoscale Zero-Valent Iron

Year: 2014

Type: article

Abstract: Nanoscale zero-valent iron modified by citric acid (m-NZVI) was used to remove hexavalent chromium (Cr (VI)) from landfill leachates. Citric acid was useful to enhance the dispersion of NZVI. The results demonstrated that the m-NZVI particles were uniform with a mean diameter of 45.6 nm and the specific surface area was about 22.8 m2/g. The Cr (VI) removal rates increased as an increase of the dosage of m-NZVI and the temperature but decreased as an increase of pH and the initial concentration of HA. Cr (VI) adsorption kinetics followed a pseudo-first-order rate expression and the reaction rate constants ranged from 0.05 to 0.32 min-1. X-ray photoelectron spectroscope (XPS) analysis confirmed that the Fe (III)-critic acid and/or Cr (III)-HA compounds were formed on the m-NZVI surface, which could hinder the formation of Fe (III)-Cr (III) compounds. It was also shown that removing Cr (VI) by m-NZVI was a chemical controlled and irreversible process.

Source: Advanced materials research

DOI: 10.4028/www.scientific.net/amr.905.12

Authors: Ting Yi Liu, Zhong Liang Wang, Xiao Xing Yan

Institution: Tianjin Normal University

Language: English

Topic: Environmental remediation with nanomaterials

Subfield: Environmental Engineering

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: hybrid

Funders: National Science Foundation, National Natural Science Foundation of China, Program for New Century Excellent Talents in University, Division of Materials Research