Portal de Periódicos da CAPES

Application of Colloidal Dispersions of Bioshell Calcium Oxide (BiSCaO) for Disinfection

2019; Multidisciplinary Digital Publishing Institute; Volume: 11; Issue: 12 Linguagem: Inglês

10.3390/polym11121991

2073-4360

Yoko Sato, Heisuke Ohata, Akinori Inoue, Masayuki Ishihara, Shingo Nakamura, Koichi Fukuda, T. Takayama, Kaoru Murakami, Sumiyo Hiruma, Hidetaka Yokoe,

Water Quality Monitoring and Analysis

Bioshell calcium oxide (BiSCaO) is a scallop-shell powder heated at a high temperature. BiSCaO is composed mainly of calcium oxide and exhibits broad microbicidal properties. The aim of this study is to evaluate the disinfection and decontamination abilities of BiSCaO colloidal dispersions with that of commercially available bioshell calcium hydroxide (BiSCa(OH)2) following the formation of flocculants/precipitates under strongly alkaline conditions (pH 11.5-12.2). Various concentrations of BiSCaO and BiSCa(OH)2 colloidal dispersions were prepared by mixing with Na-polyPO4 (PP) and Na-triPO4 (TP) as flocculating agents. The microbicidal activities, and the degree of flocculation/precipitation of trypan blue, albumin, chondroitin sulfate, heparin, non-anticoagulant heparin carrying polystyrene (NAC-HCPS), and low-molecular-weight heparin/protamine nanoparticles (LMWH/P NPs) were dependent on the pH, the average particle diameter, and the concentration of BiSCaO or BiSCa(OH)2 and of the phosphate compound. BiSCaO (average particle diameter: 6 μm) colloidal dispersions (0.2 wt.%) containing 0.15 wt.% PP or TP exhibited substantially stronger microbicidal activity and flocculation/precipitation under strongly alkaline conditions. These results suggest that BiSCaO colloidal dispersions together with phosphate compounds have practical applicability for disinfection.