Removal of hexavalent chromium ion from aqueous solution using nanoscale zero-valent iron particles immobilized on porous silica support prepared by polymer template method

• Published in: The Korean journal of chemical engineering Vol. 35; no. 10; pp. 2015 - 2023
• Main Authors: Jang, Minchae, Park, Boyeong, Lee, Hyunseung, Kim, Tae-Yong, Kim, Yangsoo
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-10-2018; Springer Nature B.V; 한국화학공학회
• Subjects: Aqueous solutions; Biotechnology; Catalysis; Chemistry; Chemistry and Materials Science; Chromium; Efficiency; Environmental Engineering; Hexavalent chromium; Industrial Chemistry/Chemical Engineering; Iron; Materials Science; Morphology; Nanoparticles; Oxidation; Polymers; Pore size; Porosity; Silicon dioxide; 화학공학; Polymer Template; Diphenylcarbazide Method; Nanoscale Zero-valent Iron; Porous Silica; Hexavalent Chromium
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-018-0113-x

Porous silica supported nanoscale zero-valent iron was prepared by a polymer template method in order to effectively remove a hexavalent chromium ion (Cr(VI)) in an aqueous solution. It did not show a deterioration of Cr(VI) removal efficiency, which could be caused by the surface oxidation and agglomeration of nanoscale zero-valent iron (NZVI) particles. Porous silica by the polymer template method showed quite unique structure, which we named as quasi-inverse opal silica (QIOS), and it showed high surface area (375.4m
2
/g) and fine pore size (76.5 nm). NZVI immobilized on the surface of QIOS (NZVI@QIOS) was added to an aqueous Cr(VI) solution at 0.025 g/L, and it showed over 96% Cr(VI) removal efficiency. Such a high removal efficiency of Cr(VI) was maintained over two weeks after preparation (92% after 16 days). Morphology of porous silica supported nanoscale zero-valent iron was analyzed by TEM and FE-SEM. Identification of the reaction compounds produced by the reaction of Cr(VI) and zero-valent iron (Fe(0)) was made by the application of XPS.