کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4989696 1456931 2017 30 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Self-sensitized photodegradation of benzisothiazolinone by low-pressure UV-C irradiation: Kinetics, mechanisms, and the effect of media
ترجمه فارسی عنوان
اشعه ماوراء بنفش از طریق اشعه ماوراء بنفش از طریق اشعه ماوراء بنفش به وسیله اشعه ماوراء بنفش با کم فشار تحت تاثیر قرار می گیرد: جنبشی، مکانیسم و ​​اثر رسانه
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
چکیده انگلیسی
Benzisothiazolinone (BIT) is a kind of non-oxidizing biocide widely used in reverse osmosis process for wastewater reclamation. Most BIT would reside in the RO (reverse osmosis) concentrates and show adverse effects on aquatic life when it is discharged into surface water. This study analyzed the photodegradation of BIT under UVC (254 nm) irradiation and found that UVC irradiation was as an efficient way to degrade BIT, of which the process could be well described by pseudo first order kinetics. As the results of BIT self-sensitization and light shield, the BIT photodegradation constant increased from 0.19 to 0.23 min−1 with increasing BIT concentration from 3 to 40 μM, and then followed by a decrease of the constant with further increasing BIT concentration. Radical species quenching experiments indicated that the photodegradation of BIT could be attributed to both direct and indirect photodegradation. Studies of the effects of pH suggested that non-charged state BIT (BIT0) in neutral and basic solution was much more photodegradable than protonated state BIT (BIT-H+) in acidic solution. The solution anion of HCO3− showed a slight promotion on BIT photodegradation. With the help of quadrupole time-of-flight mass spectrometry (QTOF-MS), the main intermediates of BIT photodegradation were identified. By employing the anion chromatography and HPLC tandem with triple quadrupole MS, the intermediates were quantified and the degradation pathway was proposed. This study could offer valuable suggestions for the efficient degradation of BIT and other similar emerging pollutants in wastewater reclamation and contribute to reclaimed water safety and sustainability.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 189, 22 December 2017, Pages 419-424
نویسندگان
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