摘要
以铂棒为阴极,铂针为阳极,2 g·L^(-1)硫酸钠溶液为电解质,构建了一种液下阳极放电等离子体的产生装置.用直流电源的内置电流表和电压表考查了电压对电流的影响规律,光纤光谱仪测量了不同放电电压下放电等离子体的发射光谱,pH计测定了阴极电解液、阳极电解液以及总体溶液的pH,ICCD相机研究了阳极放电的图斑变化.基于等离子体的发射光谱,计算了电子密度(N_(e))、OH转动温度(T_(rot))和电子激发温度(T_(e)).结果表明,阳极放电中有OH分子谱带以及O,H和Na原子谱线产生;阳极铂针周围产生H+,阴极铂棒周围产生OH-;放电20 min后,阳极周围溶液的pH约为2.5,阴极周围溶液的pH约为11.8;放电过程中,总溶液的pH基本保持在7.0左右;当放电电压从500 V逐渐升高到600 V时,OH,O,H和Na的谱线强度升高,T_(e)从3051 K升高到3628 K,OH的转动温度T_(rot)从2100 K升高到2800 K,电子密度N_(e)从2.680×10^(22)m^(-3)升高到2.894×10^(22)m^(-3).
In this work,a device of anode discharge plasma in liquid was established in 2g·L^(-1)Na_(2)SO_(4)solution using Pt needle as anode and Pt rod as cathode.The current-voltage curve was plotted by built-in ammeter and voltmeter of DC power supply,optical emission spectroscopy from 200 to 1070 nm was recorded on fiber spectrometer,the pH of the anode and cathode as well as the overall solution were measured by the pH meter,and discharge images were taken by ICCD camera under different discharge voltages.Based on the optical emission spectroscopy,the electron density(N_(e)),OH rotational temperature(T_(rot))and electron excitation temperature(T_(e))were estimated.The results showed that the emission spectral lines of OH,O,H and Na are generated.The solution around the anode Pt needle and cathode Pt rod presents the acidity and alkalinity,respectively.After discharge for 20 min,the pH of anode and cathode is about 2.5 and 11.8,respectively.During the discharge process,the pH of the total solution is neutral and about 7.0.With the increase of voltage from 500 V to 600 V,the emission intensities of OH,H and O are enhanced significantly,the T_(e)is increased from 3051 K to 3628 K,T_(rot)of OH is increased from 2100 K to 2800 K,N_(e)calculated by Hαlines is increased from 2.680×10^(22)m^(-3)to 2.894×10^(22)m^(-3).
作者
陆泉芳
马晓娟
冯妍
李娟龙
王波
LU Quan-fang;MA Xiao-juan;FENG Yan;LI Juan-long;WANG Bo(College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China;Editorial Department of the University Journal,Northwest Normal University,Lanzhou 730070,Gansu,China)
出处
《西北师范大学学报（自然科学版）》
CAS
北大核心
2022年第5期63-70,共8页
Journal of Northwest Normal University(Natural Science)
基金
甘肃省自然科学基金资助项目(21JR7RA126,21JR7RA130)。
关键词
液下阳极放电
等离子体
放电特性
光谱诊断
anode discharge in liquid
plasma
discharge characteristic
spectroscopy diagnosis
