کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
147275 456388 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxidative degradation of TMAH solution with UV persulfate activation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Oxidative degradation of TMAH solution with UV persulfate activation
چکیده انگلیسی


• The UV/S2O82− is an effective method for degrading TMAH at acidic condition.
• The TMAH degradation is affected by pH, S2O82− dose, UV intensity, and temperature.
• The demethylation mechanism is the main TMAH degradation pathway.
• TMAH degradation byproducts are identified and transformed to nitrate and ammonium.

Tetramethylammonium hydroxide (TMAH) is an alkaline, neuronal toxic, and chemically stable compound; furthermore, it is widely used in the high-tech industry as a developing agent. Disposal of TMAH wastewater from an industrial plant is a difficult and costly problem. Ultraviolet light (UV) activated persulfate (S2O82−) is an advanced oxidation process proven to be effective in destroying a variety of organic pollutants. This bench-scale study investigated the feasibility of using the UV/S2O82− process to treat TMAH. The effects of various operational parameters, including pH conditions, dosages of persulfate, UV intensities, and system temperatures were evaluated. The results revealed that pH 2 exhibited higher decay rate of TMAH (kobs = 0.0331 ± 0.0031 min−1) than other pH conditions (pH 7 and 11) at 20 °C. In general, the TMAH decay increased with increasing persulfate dosage; however, the highest TMAH degradation rate was observed with a persulfate concentration of 50 mM. Also, higher reaction temperature and stronger UV irradiation can increase the degradation of TMAH. TMAH degradation byproducts were identified and finally transformed to nitrate and ammonium, which suggested that the demethylation mechanism was the main degradation pathway.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 254, 15 October 2014, Pages 472–478
نویسندگان
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