高浓度臭氧冰的制备及贮藏条件探究

Study on preparation and storage conditions of high concentration ozone ice

臭氧冰相比于臭氧气体和臭氧水,不仅保持了臭氧原有的特性,还具有稳定性更高、保鲜效果更好、使用更方便等优势。为探究制备高浓度的臭氧冰和提高臭氧保存率的方法,实验先采用臭氧水一体机循环装置制备高浓度臭氧水,通过研究臭氧水一体机中臭氧气体流量的设定和循环水箱中水温及pH的调节,确定制备高浓度臭氧水的最适条件,再利用高浓度臭氧水制备臭氧冰,通过改变臭氧冰的制备条件和贮藏方式。结果表明:固定臭氧气体流量为3 L·min^(−1),调节循环水箱中水温为5℃、pH为3,可以在短时间内制备出质量浓度为50.27 mg·L^(−1)的臭氧水;采用液氮冻结水温为5℃、pH为5的高浓度臭氧水,可以制备出臭氧保存率达58.13%的臭氧冰;加入乙酸作为臭氧冰的酸度调节剂,于−40℃低温环境中贮藏,可有效提高冰中臭氧的稳定性。

Compared with ozone gas and ozone water,ozone ice not only maintains the original characteristics of ozone,but also shows higher ozone stability,better preservation effect and more convenient use.In this study,in order to explore methods for preparing high concentration ozone ice and improving ozone preservation rate,we used an ozone water integrated machine circulation device to prepare high-concentration ozone water.By adjusting the flow rate of ozone gas in ozone water integrated machine,the water temperature and pH in the circulating water tank,we determined the optimal conditions for preparing highconcentration ozone water.Then we used high concentration ozone water to prepare ozone ice,exploring methods for preparing high concentration ozone ice and improving ozone preservation rate by changing the preparation conditions and storage methods of ozone ice.The results show that ozone water of 50.27 mg·L^(−1) can be prepared in a short time by fixing the flow rate of ozone gas of 3 L·min^(−1) and adjusting the water temperature to 5℃in circulating water tank and at pH of 3.Ozone ice with an ozone retention rate of 58.13%can be prepared by using liquid nitrogen to freeze high-concentration ozone water at temperature of 5℃and pH of 5.In addition,the stability of ozone ice can be effectively improved by adding acetic acid as acidity regulator of ozone ice and storing the ozone ice at-40℃.