حذف فوتوكاتاليستي آنتي‌بيوتيك داكسي‌سايكلين از محلول آبي با ذرات روي اكسيد تثبيت‌شده بر روي شيشه: تأثير سنجه‌هاي عملياتي و بررسي‌هاي سينتيكي

Investigation of photocatalytic degradation of doxycycline antibiotic in aqueous solutions using immobilized zinc oxide nanoparticles on glass: influence of operational parameters and kinetic studies

ھﺪف از اﯾﻦ ﻣﻄﺎﻟﻌﮫ، ﺑﺮرﺳﻲ ﺣﺬف ﻓﻮﺗﻮﮐﺎﺗﺎﻟﯿﺴﺘﻲ آﻧﺘﻲﺑﯿﻮﺗﯿﻚ داﻛﺴﻲﺳﺎﯾﻜﻠﯿﻦ در ﻣﺤﻠﻮلھﺎي آﺑﯽ ﺑﺎ ذرات روي اﮐﺴﯿﺪ ﺗﺜﺒﯿﺖ ﺷﺪه ﺑﺮ روي ﺷﯿﺸﮫھﺎي ﻣﺨﺘﻠﻒ ﺗﺤﺖ ﺗﺎ ﺑﺶ ﻧﻮر ﻓﺮاﺑﻨﻔﺶ اﺳﺖ. ﻣﺸﺨﺼﮫ ﯾﺎﺑﯽ ﺻﻔﺤﮫھﺎي ﺷﯿﺸﮫاي ﭘﻮﺷﺶ دادهﺷﺪه ﺑﺎ ذرات روي اﮐﺴﯿﺪ ﺑﮫوﺳﯿﻠﮫ روشھﺎي ﻣﯿﮑﺮوﺳﮑﻮپ اﻟﮑﺘﺮوﻧﯽ روﺑﺸﯽ، ﻣﯿﮑﺮوﺳﮑﻮپ ﻧﯿﺮوي اﺗﻤﯽ و ﭘﺮاش اﺷﻌﮫ اﯾﮑﺲ اﻧﺠﺎم ﺷﺪ. ﺗﺄﺛﯿﺮ ﺳﻨﺠﮫھﺎي ﻋﻤﻠﯿﺎﺗﯽ )ﻏﻠﻈﺖ اوﻟﯿﮫ داﻛﺴﻲﺳﺎﯾﻜﻠﯿﻦ ، ﺷﺪت ﺗﺎﺑﺶ ﻧﻮر ﻓﺮاﺑﻨﻔﺶ و pH ( ﺑﺮ روي ﻓﻌﺎﻟﯿﺖ ﻓﻮﺗﻮﮐﺎﺗﺎﻟﯿﺴﺘﯽ ذرات روي اﮐﺴﯿﺪ و ﺳﯿﻨﺘﯿﮏ واﮐﻨﺶ ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮارﮔﺮﻓﺖ. ﯾﺎﻓﺘﮫھﺎ ﻧﺸﺎن داد ﮐﮫ روي اﮐﺴﯿﺪ ﺑﮫ ﻋﻨﻮان ﯾﮏ ﻓﻮﺗﻮﮐﺎﺗﺎﻟﯿﺴﺖ، ﮐﺎرآﯾﯽ ﻧﺴﺒﺘﺎً ﻣﻨﺎﺳﺒﯽ در ﺣﻀﻮر ﻧﻮر ﻓﺮاﺑﻨﻔﺶ ﺑﺮاي ﺣﺬف داﻛﺴﻲﺳﺎﯾﻜﻠﯿﻦ از ﻣﺤﻠﻮلھﺎي آﺑﯽ دارد . ﻣﯿﺰان ﺣﺬف داﻛﺴﻲﺳﺎﯾﻜﻠﯿﻦ در ﻏﻠﻈﺖ 75 ﻣﯿﻠﯽﮔﺮم ﺑﺮﻟﯿﺘﺮ، 6/5 = pH و ﺷﺪت ﻧﻮر 2-W m 40 و ﻣﺪت زﻣﺎن ﭼﮭﺎر ﺳﺎﻋﺖ ﺑﺮاي ﻧﺎﻧﻮذرات روي اﮐﺴﯿﺪ آﻟﺪرﯾﭻ ، ﻣﯿﮑﺮوذرات روي اﮐﺴﯿﺪ ﻣﺮك و ﻧﺎﻧﻮذرات روي اﮐﺴﯿﺪ ﺗﮭﯿﮫ ﺷﺪه ﺑﮫ ﺗﺮﺗﯿﺐ ﺑﺮاﺑﺮ 45/2 ، 48/8 و 52/7 درﺻﺪ ﺑﮫدﺳﺖ آﻣﺪ . ﺑﺮرﺳﯽھﺎي ﻌﺪﻧﯽ ﺳﺎزي ﻧﯿﺰ ﮐﺎھﺶ COD را ﺑﺎ ﮔﺬﺷﺖ زﻣﺎن ﻧﺸﺎن داد . ﻧﺘﺎﯾﺞ ﺑﺮرﺳﻲھﺎي ﺳﯿﻨﺘﯿﻜﻲ ﻧﺸﺎن دھﻨﺪه ﺳﯿﻨﺘﯿﻚ واﻛﻨﺶ ﺷﺒﮫ درﺟﮫ اول ﺑﻮد

The aim of this study is the investigation of photocatalytic degradation Doxycycline antibiotic in aqueous solution using different ZnO particles (Aldrich nanoparticles, Merck microparticles and synthesized nanoparticles via chemical deposition) immobilized on glass under UV-C light irradiation. Characteristics of the glass plates coated with ZnO particles were investigated by SEM, AFM and XRD technics. The influence of operational parameters (initinal concentration of doxycycline, UV light intensity and pH value) on activity of ZnO photocatalyst and the kinetic of reaction has been investigated. The results showed that ZnO was effective for the degradation of doxycycline from aqueous solutions in the presence of UV-C light. Removal Percent of 75 mg L-1 of doxycycline, in light intensity = 40 W m-2 and pH = 6.5, for 4 h was found 45.2, 48.80 and 52.7% for Aldrich, Merck and synthesized ZnO respectively. Results of mineralization studies also showed a decreasing trend of COD over time. The results showed that the reaction follows pseudo-first-order kinetic