Fabrication of a Nanosize Hematite Pigment via Waste Ferrous Sulfate Recycling Using Sulfur Reduction
Ye Wang (Sichuan University)
Genkuan Ren (Yibin University)
Bing Jiang (Sichuan University)
Lin Yang (Sichuan University)
Zhiye Zhang (Sichuan University)
Xinlong Wang (Sichuan University)
Yanjun Zhong (Sichuan University)
Zhiyuan Chen (TU Delft - (OLD) MSE-3)
Xiushan Yang (Sichuan University)
Kazuki Morita (University of Tokyo)
Wenhui Ma (Kunming University of Science and Technology)
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Abstract
Nanometer-sized hematite was prepared via a two-step process. In the first step, FeSO4·7H2O was oxidized to Fe2(SO4)3 by oxygen in an acidic solution. In the second step, the Fe2(SO4)3 was reduced to nanosize hematite with sulfur vapor at 550 °C. The hematite has good thermal stability up to 500 °C and good colloid stability in water-based paint. Its properties satisfy the requirements of the international standard ISO 1248-A-I-1-a for an iron oxide red pigment. Graphical abstract: [Figure not available: see fulltext.]