کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7043796 | 1456920 | 2018 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The enhanced method of hydroxyl radical generation in the heterogeneous UV-Fenton system with α-FeOOH as catalyst
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کلمات کلیدی
TOCAOPBrunauer-Emmett-TellerUV-Fentonα-FeOOHOxalate - اگزالات Hydroxyl radical - رادیکال هیدروکسیلBET - شرطX-ray photoelectron spectroscopy - طیف سنجی فوتوالکتر اشعه ایکسXPS - طیف نگاری فوتوالکترونی اشعه ایکسAdvanced oxidation processes - فرایندهای اکسیداسیون پیشرفتهSEM - مدل معادلات ساختاری / میکروسکوپ الکترونی روبشیscanning electron microscope - میکروسکوپ الکترونی اسکنOrange II - نارنجی IIXRD - پراش اشعه ایکسX-ray powder diffraction - پراش پودر اشعه ایکسTotal organic carbon - کل کربن آلی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
An enhanced method of hydroxyl radical generation was studied to lead a better understanding of the catalytic mechanism of α-FeOOH in UV-Fenton system. The catalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption-desorption isotherms and scanning electron microscope. The Orange II degradation and hydroxyl radical concentration under different conditions were studied in detail. The results showed that the hydroxyl radical was mainly oxidizing species for Orange II degradation. And the hydroxyl radical generation included both homogeneous and heterogeneous UV-Fenton processes. In heterogeneous UV-Fenton system, the additional oxalate could increase the ratio of homogeneous UV-Fenton process for hydroxyl radical generation. In oxalate enhanced system, the peak value of hydroxyl radical concentration would increase to 11.314â¯Î¼mol/L which was nearly twice as it in heterogeneous UV-Fenton system (5.978â¯Î¼mol/L). The k values of Orange II discoloration and mineralization increased to 0.386â¯minâ1 and 0.044â¯minâ1, which were 1.169 and 0.692 times as that in heterogeneous UV-Fenton system (0.178â¯minâ1 and 0.026â¯minâ1). After treatment, the total iron ions concentration decreased to 2.357â¯Î¼mol/L in oxalate enhanced system. The results indicated that additional oxalate was a promising enhanced method for hydroxyl radical generation in heterogeneous UV-Fenton system with α-FeOOH as catalyst.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 200, 12 July 2018, Pages 36-43
Journal: Separation and Purification Technology - Volume 200, 12 July 2018, Pages 36-43
نویسندگان
Xiaozeng Miao, Huiwang Dai, Jianxin Chen, Jianxi Zhu,