کاربرد پودر هسته ازگیل برای حذف متیلن بلو از محلول آبی

در اﯾﻦ ﭘﮋوﻫﺶ ﮐﺎراﯾﯽ ﭘﻮدر ﻫﺴﺘﻪ ازﮔﯿﻞ ﺑﻪ ﻋﻨﻮان ﯾﮏ ﺟﺎذب ارزان ﻗﯿﻤﺖ ﺑﺮای ﺣﺬف رﻧﮕﯿﻨﻪ ﮐﺎﺗﯿﻮﻧﯽ ﻣﺘﯿﻠﻦ ﺑﻠﻮ از ﻣﺤﻠﻮل آﺑﯽ در ﺳﯿﺴﺘﻢ ﻫﺎی ﭘﯿﻮﺳﺘﻪ و ﻧﺎﭘﯿﻮﺳﺘﻪ ﺑﺮرﺳﯽ ﺷﺪ. اﺛﺮ ﭘﺎراﻣﺘﺮﻫﺎی ﻣﺨﺘﻠﻔﯽ ﻣﺎﻧﻨﺪ: ﻣﻘﺪار ﺟﺎذب، ﻏﻠﻈﺖ اوﻟﯿﻪ رﻧﮓ، زﻣﺎن ﺗﻤﺎس، ph ﻣﺤﻠﻮل و دﻣﺎ ﺑﺮای درک رﻓﺘﺎر ﺟﺬب، ﺟﺎذب در ﺷﺮاﯾﻂ ﻣﺨﺘﻠﻒ ﻣﻮرد ﻣﻄﺎﻟﻌﻪ ﻗﺮار ﮔﺮﻓﺖ. ﺗﮑﻨﯿﮏ ﻫﺎی ﻣﺨﺘﻠﻔﯽ ﺑﺮای ﺗﺸﺨﯿﺺ وﯾﮋﮔﯽ ﻫﺎی ﺟﺎذب اﺳﺘﻔﺎده ﺷﺪ ﮐﻪ ﺷﺎﻣﻞ: ﻃﯿﻒ ﺳﻨﺠﯽ ﻣﺎدون ﻗﺮﻣﺰ ﺗﺒﺪﯾﻞ ﻓﻮرﯾﻪ ftir ، ﻣﯿﮑﺮو ﺳﮑﻮپ اﻟﮑﺘﺮوﻧﯽ روﺑ ﺸﯽ sem . داده ﻫﺎی ﺗﺠﺮﺑﯽ اﯾﺰوﺗﺮم ﺑﺎ ا ﺳﺘﻔﺎده از اﯾﺰوﺗﺮم ﻫﺎی ﻓﺮوﻧﺪﻟﯿﭻ و ﻻﻧﮕﻤﻮﯾﺮ ﺗﺤﻠﯿﻞ ﺷﺪ. ﺟﺬب ﻣﺘﯿﻠﻦ ﺑﻠﻮ ﺑﺮ روی ﺟﺎذب از ﻣﺪل اﯾﺰوﺗﺮﻣﯽ ﻻﻧﮕﻤﻮﯾﺮ ﺑﺎ ﺣﺪاﮐﺜﺮ ﻇﺮﻓﯿﺖ ﺟﺬب mɡ/ɡ 66/22 ﭘﯿﺮوی ﻣﯽﮐﻨﺪ. ﻧﺘﺎﯾﺞ ﺳﯿﻨﺘﯿﮏ ﺟﺬب، ﻣﺪل ﺷﺒﻪ ﻣﺮﺗﺒﻪ دوم را ﻧﺸﺎن ﻣﯽ دﻫﺪ. ﭘﺎراﻣﺘﺮﻫﺎی ﺗﺮﻣﻮدﯾﻨﺎﻣﯿﮑﯽ از ﺟﻤﻠﻪ اﻧﺮژی آزاد ﮔﯿﺒﺲ °g∆ ، آﻧﺘﺎﻟﭙﯽ °h∆ و آﻧﺘﺮوﭘﯽ °s∆ ﻧﺸﺎن داد ﮐﻪ ﺟﺬب ﻣﺘﯿﻠﻦ ﺑﻠﻮ ﺑﺮ روی ﭘﻮدر هسته ازگیل خود به خودی و گرماگیر است. حداکثر درصد حذف رنگ96.4 % برای m ɡ /l 100 از ml 25محلول متیلن بلو تحت شرایط 7 =ph ، دمای 25°c و 0.08ɡ جاذب بود.

Application of medlar core powder to remove methylene blue from aqueous solution

The efficiency of medlar core powder as a low-cost adsorbent for removing a cationic dye methylene blue (MB) from aqueous solution has been investigated by using batch mode and continuous systems experiments. The effects of different parameters namely amount of adsorbent, initial dye concentration, contact time, temperature and pH solution of dye solution have been studied to understand the adsorption behavior of the adsorbent under various conditions. Various techniques for characterizing the adsorbent have been applied including, zero point charge measurement (pHpzc), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The experimental isotherm data have been analyzed using Langmuir and Freundlich isotherm equation. Methylene blue adsorption fitted the Langmuir isotherm. The kinetic results of adsorption obeyed a pseudo-second order model. Thermodynamic parameters including the Gibbs free energy ΔG°, enthalpy ∆H° and entropy ∆S° have revealed that the adsorption of methylene blue on the medlar core powder is feasible, spontaneous and endothermic. The maximum removal percent 25mL of methylene blue solution is 96.4% for 100 mɡ/L of MB under conditions, pH=7 at a temperature 25 °C and 0.08 ɡ/L of adsorbent.