An-Najah University Journal for Research - A (Natural Sciences)

Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media

Article info

2015-04-04
2015-06-30
283 - 302

Keywords

  • Photodegradation
  • Methylene Blue
  • ZnO
  • TiO2
  • Water Purification.

Abstract

Nano-powders of commercial ZnO and TiO2 were investigated as photo-catalysts for mineralization of methylene blue (MB) in aqueous media. Comparative study was performed under solar-simulated light at room temperature and neutral conditions. Both systems showed activity and caused complete mineralization of the reacted MB molecules of low concentrations. The ZnO system showed much higher catalytic efficiency than the TiO2 counterpart. Spectrophotometric analysis of the reaction mixture showed that up to 100% removal of MB was achieved by ZnO catalyst in 60 min, whereas the TiO2 caused only 50% removal after the same time exposure. The UV light present in the solar simulator light (with about 5%) was responsible for mineralization of MB. Due to its higher efficiency, the ZnO system was then considered the catalyst of choice, where effects of different reaction parameters have been studied including: value of pH, temperature, light intensity, catalyst amount and MB concentration. The catalyst efficiency was measured by calculating values of turn-over number (TN), and quantum yield, after 30 min. The ZnO catalyst was isolated after reaction cessation and re-used for three times, where the catalyst retained up to 95% of its efficiency. The results show the potential value of using ZnO as a photo-catalyst for mineralization of MB in water with solar light.

Recommended Citation

Zyoud, A., Hilal, H. S., Aboasba, I., & Badwan, L. (2016). Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media. An-Najah University Journal for Research - A (Natural Sciences), 30(2), 283–302. https://doi.org/10.35552/anujr.a.30.2.1280
[1]A. Zyoud, H. S. Hilal, I. Aboasba, and L. Badwan, “Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media,” An-Najah University Journal for Research - A (Natural Sciences), vol. 30, no. 2, pp. 283–302, Jun. 2016, doi: 10.35552/anujr.a.30.2.1280.
Zyoud, Ahed, et al. “Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media.” An-Najah University Journal for Research - A (Natural Sciences), vol. 30, no. 2, June 2016, pp. 283–302. Crossref, https://doi.org/10.35552/anujr.a.30.2.1280.
1.Zyoud A, Hilal HS, Aboasba I, Badwan L. Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media. An-Najah University Journal for Research - A (Natural Sciences) [Internet]. 2016 Jun;30(2):283–302. Available from: http://dx.doi.org/10.35552/anujr.a.30.2.1280
Zyoud, Ahed, Hikmat S. Hilal, Isra Aboasba, and Layla Badwan. “Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media.” An-Najah University Journal for Research - A (Natural Sciences) 30, no. 2 (June 2016): 283–302. https://doi.org/10.35552/anujr.a.30.2.1280.

تقييم قدرة استخدام حبيبات اكسيد الزنك وأكسيد التيتانيوم في تحطيم صبغة الميثيل الأزرق في المحاليل المائية تحت ضوء مضاهي لضوء الشمس

معلومات المقال

2015-04-04
2015-06-30
283 - 302

الكلمات الإفتتاحية

  • Photodegradation
  • Methylene Blue
  • ZnO
  • TiO2
  • Water Purification.

الملخص

تهدف هذه الدراسة لتقيم قدرة حبيبات أكسيد الزنك وأكسيد التيتانيوم النانومترية على تحطيم صبغة الميثيل الازرق في المحاليل المائية. تمت هذه المقارنة باستخدام مصدر ضوئي مضاهي لضوء الشمس على درجة حرارة الغرفة وحامضية معتدلة. حيث أبدى الحفازان قدرة على تحطيم صبغة الميثيل الأزرق، الا أن أكسيد الزنك اظهر كفاءة أكبر مقارن بأكسيد التيتانيوم. التحليل الضوئي لنتائج التفاعل أظهرت التحطيم شبه الكامل ~100% للصبغة في حالة أكسيد الزنك خلال ساعة من التعرض للضوء، بينما استطاع أكسيد التيتانيوم من تحطيم 50% من الصبغة بعد التعرض لنفس الفترة من الضوء. عملية تحطيم الملوثات ناتجة عن تحفيز الحفازات بالأشعة فوق البنفسجية شحيحة التوفر في الضوء الشمسي الواصل الى الارض. تم دراسة بعض المتغيرات مثل تاثير درجة الحموضة ودرجة الحرارة وكثافة الضوء وكمية الحفاز المستخدم وتركيز صبغة الملوث على معدل ازالة الصبغة من المياه. وابدى استخدام اكسيد الزنك لعدة مرات متتالية كفاءة ثابتة نسبياً للعمل على تحطيم الملوث.

Recommended Citation

Zyoud, A., Hilal, H. S., Aboasba, I., & Badwan, L. (2016). Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media. An-Najah University Journal for Research - A (Natural Sciences), 30(2), 283–302. https://doi.org/10.35552/anujr.a.30.2.1280
[1]A. Zyoud, H. S. Hilal, I. Aboasba, and L. Badwan, “Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media,” An-Najah University Journal for Research - A (Natural Sciences), vol. 30, no. 2, pp. 283–302, Jun. 2016, doi: 10.35552/anujr.a.30.2.1280.
Zyoud, Ahed, et al. “Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media.” An-Najah University Journal for Research - A (Natural Sciences), vol. 30, no. 2, June 2016, pp. 283–302. Crossref, https://doi.org/10.35552/anujr.a.30.2.1280.
1.Zyoud A, Hilal HS, Aboasba I, Badwan L. Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media. An-Najah University Journal for Research - A (Natural Sciences) [Internet]. 2016 Jun;30(2):283–302. Available from: http://dx.doi.org/10.35552/anujr.a.30.2.1280
Zyoud, Ahed, Hikmat S. Hilal, Isra Aboasba, and Layla Badwan. “Comparative Assessment of ZnO and TiO2 Nano-Particles in Solar Simulated Light Mineralization of Methylene Blue in Aqueous Media.” An-Najah University Journal for Research - A (Natural Sciences) 30, no. 2 (June 2016): 283–302. https://doi.org/10.35552/anujr.a.30.2.1280.

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