Adsorption Thermodynamics of a Ciprofloxacin Drug from Aqueous Solutions on [Graphene Oxide/ poly Acrylic Acid /Microcrystalline Cellulose] Composite

Abstract

Zainab Hashim Khudhair, Layth Sameer Jasim

Composite hydrogels [Graphite oxide /poly (acrylic acid – microcrystalline cellulose)] [GO/ (AAC-MCC)] super absorbent composites were synthesized by free radical polymerization of (AAC and MCC) as a monomer, using N, N-methylene bisacryl amide (MBA) as cross-linker and ammonium persulfate (KPS) as initiator. GO/ (AAC-MCC) composite was characterized by (FTIR), (FE-SEM), (AFM), (XRD), and BET (Brunauer–Emmett–Teller) specific surface area and pore structure of the adsorbent was also examined. The synthesis composite was used as adsorbent for removal of a ciprofloxacin drug from aqueous solution. we obtained data about thermodynamic, we applied data on Langmuir, Freundlich and models equation to get it information on adsorption process, the study clarify effect some parameter on quantity of adsorbate such as pH at range (1.2-10), ionic strength by used three types of salts, temperature at rang (10, 15, 20 and 25oC)., contact time (1-360 min) and weight of adsorbate at range(0.01-0.1 g), it’s found when increase of temperature and ionic strength will decrease of quantity the adsorbate presences under the following optimum condition at temperature 20oC, contact time 120 min, pH = 2. The adsorption isotherm appears that adsorption process applied models Freundlich and Langmuir. Thermodynamic functions process calculated and appeared the adsorption spontaneous and exothermic process, also the synthesized adsorbents showed high efficiency in removal of ciprofloxacin drug from aqueous solution and a very high adsorption capacity.

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