The role of counter ions in nano-hematite synthesis: Implications for surface area and selenium adsorption capacity

JOURNAL OF HAZARDOUS MATERIALS

卷:310

Article

Lounsbury, Amanda W.¹  Yamani, Jamila S.¹  Johnston, Chad P.²  Larese-Casanova, Philip³  Zimmerman, Julie B.^1,4 

[1] Yale Univ, Dept Chem & Environm Engn, Mason Lab, 9 Hillhouse Ave, New Haven, CT 06511 USA

[2] Univ Connecticut, Dept Civil & Environm Engn, Castleman Bldg,261 Glenbrook Rd, Storrs, CT 06269 USA

[3] Northeastern Univ, Dept Civil & Environm Engn, Snell Engn Ctr, 360 Huntington Ave, Boston, MA 02115 USA

[4] Yale Univ, Sch Forestry & Environm Studies, Kroon Hall,195 Prospect St, New Haven, CT 06511 USA

关键词: Adsorption;    Selenium;    Iron oxide;    Hematite;    Nanoparticles;   

DOI  :  10.1016/j.jhazmat.2016.01.078

来源: Elsevier

【 摘 要 】

Nano metal oxides are of interest for aqueous selenium (Se) remediation, and as such, nano-hematite (n alpha-Fe2O3) was examined for use as a Se adsorbent. The effect of surface area on adsorption was also studied. n alpha-Fe2O3 particles were synthesized from Fe(NO3)(3) and FeCl3 via forced hydrolysis. The resulting particles have similar sizes, morphologies, aggregate size, pore size, and PZC. The n alpha-Fe2O3 from FeCl3 (n alpha-Fe2O3-C) differs from the n alpha-Fe2O3 from Fe(NO3)(3) (n alpha-Fe2O3-N) with a similar to 25 +/- 2 m(2)/g greater surface area. Selenite Se(IV) adsorption capacity on n alpha-Fe2O3 has a q(max) similar to 17 mg/g for the freeze-dried and resuspended n alpha-Fe2O3. The Delta q(max) for n alpha-Fe2O3 from Fe(NO3)(3) and FeCl3 that remained in suspension was 4.6 mg/g. For selenate Se(VI), the freeze-dried and re-suspended particles realize a Delta q(max) = 1.5 mg/g for n alpha-Fe2O3 from Fe(NO3)(3) and FeCl3. The n alpha-Fe2O3 from Fe(NO3)(3) and FeCl3 that remained in suspension demonstrated Se(VI) Delta q(max)=5.4 mg/g.

【 授权许可】

Free