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Adsorption of methylene blue using polyvinyl alcoholpolyethylene glycol nanocomposite incorporated with multiwalled carbon nanotubes

Adsorption of methylene blue using polyvinyl alcoholpolyethylene glycol nanocomposite incorporated with multiwalled carbon nanotubes / Yuveraj Thanasagaran

Abstract Kecekapan polivinil alkohol/polietilen glikol (PVA/PEG) dan polivinil alkohol/polietilena glikol yang digabungkan dengan tiub nano karbon dinding barlapis (PVA/PEG/MWCNTs) bagi proses penjerapan dikaji dengan penyingkiran metelina biru (MB) dari larutan akueus. Kesan parameter operasi bagi proses penjerapan termasuk masa penjerapan, kepekatan awal MB dan dos bahan penjerap untuk penyingkiran MB telah dikaji dan keadaan optimum untuk penyingkiran maksimum ditentukan. Peratus penyingkiran maksimum MB oleh PVA/PEG didapati sebagai 31.16 % pada 240 minit (masa penjerapan), 10 mg/L (kepekatan awal MB) dan 1 g (dos PVA/PEG). Manakala untuk penjerapan MB oleh PVA/PEG/MWCNTs didapati sebagai 99.85% pada 1290 minit (masa penjerapan), 10 mg/L (kepekatan awal MB) dan 1 g (dos PVA/PEG/MWCNTs). Data keseimbangan yang diperolehi disahkan menggunakan model isoterma Langmuir, Freundlich dan Temkin dan keputusan menunjukkan bahawa model Langmuir menunjukkan persetujuan yang terbaik dengan data keseimbangan bagi kedua-dua adsorben dengan nilai 𝑅2 = 0.9898 dan 0.9868 untuk PVA/PEG dan PVA/PEG/MWCNTs, masing-masing. Dari model ini, kapasiti penjerapan maksimum (𝑞𝑚) untuk penjerapan melalui PVA/PEG dan PVA/PEG/MWCNTs ditentukan sebagai 0.687 mg/g dan 3.174 mg/g masing-masing. Proses penjerapan menggunakan kedua-dua adsorben didapati didominasi oleh tertib pseudo-kedua oleh PVA/PEG dan PVA/PEG/MWCNTs dengan nilai 𝑅2 = 0.9595 dan 0.9997, masing-masing. _______________________________________________________________________________________________________ Adsorption performance of polyvinyl alcohol/polyethylene glycol (PVA/PEG) and polyvinyl alcohol/polyethylene glycol incorporated with multiwalled carbon nanotube (PVA/PEG/MWCNTs) were investigated by removal of methylene blue (MB) from aqueous solution. The PVA/PEG and PVA/PEG/MWCNTs adsorbents were synthesized by solution casting method for the adsorption experiment. The effects of operational parameters which includes contact time, initial concentration and adsorbent dosage on removal of MB were studied and the optimum conditions for maximum removal were determined. The maximum removal of MB by PVA/PEG were found to be 31.16% at 240 min (contact time), 10 mg/L (MB concentration) and 1 g (PVA/PEG dosage) while for adsorption of MB by PVA/PEG/MWCNTs were found to be 99.85% at 1290 min (contact time), 10 mg/L (MB concentration) and 1 g (PVA/PEG/MWCNTs dosage). The equilibrium data obtained were fitted by Langmuir, Freundlich and Temkin isotherm models and Langmuir model showed good agreement with the equilibrium data for both adsorbents with 𝑅2 of 0.9898 and 0.9868 for PVA/PEG and PVA/PEG/MWCNTs, respectively. On the other hand, the maximum adsorption capacity (𝑞𝑚) for adsorption by PVA/PEG and PVA/PEG/MWCNTs were determined as 0.687 mg/g and 3.174 mg/g, respectively. The adsorption process using both the adsorbents found to be dominated by pseudo-second-order with 𝑅2 for the PVA/PEG and PVA/PEG/MWCNTs were 0.9595 and 0.9997, respectively.

Contributor(s): Yuveraj Thanasagaran - Author Primary Item Type: Final Year Project Identifiers: Accession Number : 875008131 Language: English Subject Keywords: Adsorption; (PVA/PEG); (PVA/PEG/MWCNTs) First presented to the public: 6/1/2019 Original Publication Date: 7/2/2019 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Chemical Engineering Citation: Extents: Number of Pages - 66 License Grantor / Date Granted:   / ( View License ) Date Deposited 2019-07-02 12:23:13.369 Submitter: Mohd Jasnizam Mohd Salleh

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