摘要
采用自制的TiO2为催化剂,探讨TiO2-超声协同降解水中低质量浓度乙酰甲胺磷的作用。考察处理温度、pH值、超声声强、TiO2加入量及TiO2-超声协同作用对乙酰甲胺磷降解率的影响。结果表明:在5～20℃之间、超声1h以内,温度越高,超声时间越长,乙酰甲胺磷的降解率越高;pH值为3.0的偏酸环境有利于乙酰甲胺磷的降解;在一定范围内,TiO2加入量与乙酰甲胺磷降解率呈正相关;当超声功率为40W/cm2时,有利于乙酰甲胺磷降解率的提高;且超声与TiO2对于乙酰甲胺磷的降解有一定的协同作用,当温度20℃、pH值3.0、超声频率25kHz、声强40W/cm2、TiO2加入量0.6g/L时,经过50min超声降解,质量浓度为2mg/L的乙酰甲胺磷降解率可达78.3%。
Titanium dioxide was prepared and used to explore its synergistic effect with ultrasonic on degradation of acephate aqueous solution at low concentration.The degradation rate of acephate was investigated with respect to temperature,pH,ultrasonic intensity,titanium dioxide amount and various combinations of ultrasonic intensity and titanium dioxide amount.The degradation rate of acephate increased as the ultrasonic treatment time increased up to 1 h and the temperature increased from 5 ℃ to 20 ℃.An acidic environment of pH 3 was favorable to the degradation of acephate.Within a certain range,titanium dioxide amount was positively related to the degradation rate of acephate.An ultrasonic intensity of 40 W/cm2 was conducive to increasing the degradation rate of acephate.Moreover,ultrasonic and titanium dioxide could synergistically degrade acephate.A degradation rate of 78.3% was observed for 2 mg/L acephate aqueous solution at 20 ℃ and pH 3.0 with the addition of titanium dioxide at 0.6 g/L after 50 min ultrasonic treatment at a frequency of 25 kHz and an intensity of 40 W/cm2.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2012年第1期39-43,共5页
Food Science
基金
国家自然科学基金项目(50776060)
上海市启明星项目(07QA14042)
上海市自然科学基金项目(10ZR1420700)
教育部新世纪优秀人才支持计划项目(NCET-07-0559)
上海市教委重点学科项目(S30503)
上海市东方学者资助项目
上海市研究生创新基金项目(JWCXSL1022)
关键词
TIO2
超声波
乙酰甲胺磷
降解
titanium dioxide
ultrasonic
acephate
degradation
