TN999 : Useing engineered titanium dioxide nanophotocatalyst in removing heavy mextals arsenic and mercury from the solution
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2020
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Abstarct: In this study, in order to remove arsenic and mercury from aqueous media,
initial tests were performed to optimize experiments baxsed on spinel nanoparticals Mn〖Fe〗_2 O_4 , 〖TiO〗_2-Mn〖Fe〗_2 O_4 and Mn〖Fe〗_2 O_4-〖TiO〗_2-GO were synthesized by co-precipitation method after that for find modified nano absoption, the test was performed with constant concentration of arsenic and mercury and time. Mn〖Fe〗_2 O_4-〖TiO〗_2 -GO (uncalcified) nanosorbent was selected as the optimal nanosorbent which was characterized by XRD.FE-SEM.BET.EDS and DLS analyzes. baxsed on the results of DLS analysis, the dimensions ranging, was between: 127.6 to 617.6 nm. specific surface area was measured by BET at 140.96 m2⁄g. In this study, the optimal pH was considered in 7. The maximum adsorption capacityfor Hg was 1623.33 mg ⁄g, and for arsenic was, 336.3 mg/g. Moreover, adsorption isotherms, kinetics, thermodynamics, desorption and competitive adsorption were studied to understand the mechanism of adsorbing mextal ions. All the results demonstrate that MnFe2O4 modified with Tio2 and Graphene oxide is potential recyclable and effective adsorbents for heavy mextal ions. The adsorption equilibrium was described by pseudo second order model and adsorption isotherms being fitted with Langmuir model and adsorption process was exothermic. The final recovery was 97.4% and 99.92% for mercury and arsenic, respectively.
Keywords:
#Adsorption #Heavy mextals #Magnetic nanoparticles #Ferrite spinels Keeping place: Central Library of Shahrood University
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