Evaluation of the Slow Release Oxygen Properties and pH Control Ability of Oxygen Slow-releasing Materials

Abstract

In this study, an oxygen slow-releasing materials (OSRM) was developed by simple one-step synthesis. The composition of OSRM included calcium peroxide, bentonite or carclazyte, cement, potassium dihydrogen phosphate (KH₂PO₄) and ammonium sulphate((NH₄)₂SO₄). The OSRM was natural and non-toxic. The slow release oxygen properties and pH control ability of OSRM were evaluated. Results showed that the oxygen concentration increased and kept stable in a week after the addition of OSRM. The OSRM added with KH₂PO₄ and (NH₄)₂SO₄ was better than The OSRM doped with carclazyte in controling the pH approaching to neutralization. Besides, The OSRM doped with carclazyte instead of bentonite led to the oxygen release slowly. In stimulated sediment environment, the pH value in water was stable at about 7.6 after 4 g/L of OSRM added. This phenomenon may be due to functional groups with buffer capacity occurred in sediment.