Removal of Cr(Ⅵ)in Water by Modified Yeast Supported Sulfidated Iron Nanoparticles
Modified yeast supported sulfidated iron nanoparticles(S-nZVI/SCM)was green synthesized by using modified yeast as carrier,tobacco leaf extract as reducing agent and sulfided by sodium sulfide.The as-prepared S-nZVI/SCM was used for the removal of Cr(Ⅵ)from water.The results show that the removal of Cr(Ⅵ)by S-nZVI/SCM is mainly through the reduction of Cr(Ⅵ)to Cr(Ⅲ)and then co-precipitation with Fe(Ⅲ).The removal rate of Cr(Ⅵ)increased with the increase of S-nZVI/SCM dosage,and decreased with the increase of solution pH and initial Cr(Ⅵ)concentration,while reaction temperature influences the Cr(Ⅵ)removal slightly.The removal rate of 100 mg/L Cr(Ⅵ)by 2.5g/L S-nZVI/SCM is(93.8±0.4)％.The coexistence of 1 mmol/L of Fe3+,Mg2+,Ca2+and SO42-enhanced the Cr(Ⅵ)reduction,while 1 mmol/L of H PO42-and HCO3-decreased the Cr(Ⅵ)removal rate within 5％.The effects of 1 mmol/L K+,NO3-and Cl-co-existing on Cr(Ⅵ)removal are slightly.S-nZVI/SCM can be an effective in situ remediation agent for Cr(Ⅵ)removal,providing a basis for the development and application of low-cost and green nano zero valent iron modified materials.
modified yeasttobacco leaf extractsulfidated iron nanoparticlesCr(Ⅵ)
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