Concurrent adsorption and micro-electrolysis of Cr(VI) by nanoscale zerovalent iron/biochar/Ca-alginate composite

Environ Pollut. 2019 Apr;247:410-420. doi: 10.1016/j.envpol.2019.01.047. Epub 2019 Jan 14.

Abstract

This study introduced a new approach for simultaneously enhancing Cr(VI) removal performance and mitigating release of dissolved Fe during nanoscale zero-valent iron (nZVI)-mediated reactions. After entrapping nZVI-impregnated biochar (BC) in the matrix of calcium-alginate (CA) bead, the physicochemical characterization of nZVI/BC/CA composites revealed that nZVI/BC particles were embedded inside CA having a spherical shape and several cracks on its outer layer. The multi-functionality of nZVI/BC/CA composites consisting of reductant (nZVI), porous adsorbent (BC), and external screening layer (CA) enhanced the removal of Cr(VI) with the maximum adsorption capacity of 86.4 mg/g (based on the Langmuir isotherm) and little release of dissolved Fe. With the XPS analysis and fitting results of kinetics (pseudo second order) and isotherms (Redlich-Peterson model), plausible removal mechanisms of Cr(VI) were simultaneous adsorption and micro-electrolysis reactions by nZVI/BC/CA composites. The practical applicability of nZVI/BC/CA composites was further demonstrated through the fixed-bed column experiments. These results provide new insights into the design of high-performance engineered biochar for wastewater treatment.

Keywords: Engineered biochar; Green/sustainable remediation; Hexavalent chromium; Metal-biochar composite; Solid-supported nZVI.

MeSH terms

  • Adsorption
  • Alginates
  • Calcium / chemistry
  • Charcoal / chemistry*
  • Chromium / chemistry*
  • Electrolysis
  • Iron / chemistry
  • Kinetics
  • Models, Chemical*
  • Water Pollutants, Chemical / analysis

Substances

  • Alginates
  • Water Pollutants, Chemical
  • biochar
  • Chromium
  • Charcoal
  • chromium hexavalent ion
  • Iron
  • Calcium