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Study the adsorption of methylene blue (mb) dye by poly (vinyl) alcohol infused multiwalled carbon nanotubes hydrogel beads

Study the adsorption of methylene blue (mb) dye by poly (vinyl) alcohol infused multiwalled carbon nanotubes hydrogel beads / Kalai Yoogan Visava Nathan

Abstract Proses penjerapan adalah satu proses yang digunakan secara meluas dalam usaha untuk menyerap pewarna metilena biru (MB) daripada sisa industri. PVA dan PVA yang digabungkan dengan tiub nano karbon (PVA/MWCNT) disediakan dan digunakan dalam bentuk manik sebagai penjerap. Proses kelompok telah digunakan untuk menyiasat masa sentuhan, kepekatan awal MB dan dos penjerap untuk menentukan keadaaan proses penjerapan. Tiada perubahan warna yang ketara direkod dalam proses penyerapan pewarna MB oleh PVA dan PVA/MWCNT selepas 4 jam dan 4.5 jam masing-masing. PVA/MWCNT telah mencapai kecekapan penyingkiran pewarna sebanyak 84.94 % manakala PVA telah mencapai 31.35 % dengan menggunakan 10 mg/L campuran pewarna. Isotherma penjerapan Langmuir, Freundlich dan Elovich telah dikaji dan didapati data penjerapan selari dengan model isotherma Langmuir jenis I. Manik PVA/MWCNT didapati mempunyai kapasiti penjerapan maksimum sebanyak 1.5319 mg/g manakala PVA mempunyai 0.1667 mg/g. Kajian kinetika penjerapan untuk penyingkiran pewarna MB menunjukkan bahawa model pseudo tertib kedua adalah terbaik dan selari dengan data eksperimen. Secara keseluruhannya, manik PVA/MWCNT adalah sangat berkesan berbanding dengan manik PVA dalam usaha penyingkiran pewarna MB. _______________________________________________________________________________________________________ Adsorption is a widely used technique for the removal of methylene blue (MB) from wastewater. Polyvinyl alcohol (PVA) and Polyvinyl alcohol/multiwalled carbon nanotubes (PVA/MWCNTs) in beads form were prepared and used as adsorbents. Batch adsorption experiment was conducted to study the effect of contact time, initial dye concentration, and adsorbent dosage on dye adsorption properties. There was no visible change in the removal of MB dye on PVA and PVA/MWCNTs beads after 4 hours and 4.5 hours, respectively. PVA/MWCNTs recorded the highest dye removal efficiency of 84.94 % whereas PVA recorded 31.35 % in a 10 mg/L dye solution. Langmuir, Freundlich and Elovich adsorption isotherms were studied and the results showed that the MB adsorption is best represented by the Langmuir Type I isotherm model. PVA/MWCNTs beads has maximum adsorption capacity of about 9 times higher than that of PVA beads. The maximum adsorption capacity of PVA/MWCNTs recorded 1.5319 mg/g while PVA recorded only 0.1667 mg/g. The adsorption kinetics study of MB dye removal revealed that pseudo-second order model fit best to an experimental data. The overall results indicated that PVA/MWCNTs beads are more effective than PVA beads in MB dye removal.

Contributor(s): Kalai Yoogan Visava Nathan - Author Primary Item Type: Final Year Project Identifiers: Accession Number : 875008096 Language: English Subject Keywords: Adsorption; (MB); wastewater First presented to the public: 6/1/2019 Original Publication Date: 6/26/2019 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Chemical Engineering Citation: Extents: Number of Pages - 62 License Grantor / Date Granted:   / ( View License ) Date Deposited 2019-06-26 16:17:29.606 Submitter: Mohd Jasnizam Mohd Salleh

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