1. UKM Learning and Research Repository
2. Master Thesis / Tesis Master
3. Faculty of Science and Technology / Fakulti Sains dan Teknologi

Title:	Adsorption studies of methylene blue utilize graphene oxide and graphene oxide encapsulated cellulose bead
Authors:	Nur Fazlinda Razali (P63002)
Supervisor:	Sarani Zakaria, Prof. Dr.
Keywords:	Grafin Oksida (Go) Hidrogel Manik Grafin Oksida (HBGO) Graphene -- Absorption and adsorption Adsorption Dissertations, Academic -- Malaysia
Issue Date:	18-Jul-2014
Description:	This research intended to study the effectiveness of adsorption performance of graphene oxide (GO) and hydrogel bead graphene oxide (HBGO) for the removal of organic dyes, methylene blue (MB) from aqueous solution. The graphene oxide (GO), produced using the simple Hummer's method and the hydrogel beads were produced using pre-cooled method. The surface of GO and HBGO was characterized using Transmission Electro Microscope (TEM) & Field Emission Scanning Electron Microscopy (FESEM) respectively and both sample have been analyzed using thermogravimetric analysis (TGA) to compare the thermal conductivity. Fourier Transform Infrared (FTIR) were use to identify functional groups of both samples. The adsorption kinetics and isotherm studies were conducted under different conditions (pH = 3-9 and MB concentration = 200-600 mg/L) to examine the adsorption efficiency of the GO and HBGO towards MB in aqueous solution. The achieved results showed that the maximum adsorption capacity of the HBGO towards MB can achieve up to ~450 mg/g for the adsorption at 300 mg/L MB meanwhile GO maximum adsorption capacity is up to ~700 mg/g. The adsorption kinetics data were analyzed using different kinetic models to investigate the adsorption behavior of MB on GO and HBGO. Both the adsorption kinetic data were found to fit pseudo-second order model as compared with pseudo-first order model. Meanwhile, adsorption isotherms were analyzed using Freundlich and Langmuir models. The equilibrium adsorption data were fitted to Langmuir isotherms. This may explain that the absorption of MB on graphene oxide has formed monolayer absorption.,Kajian ini bertujuan untuk mengkaji keberkesanan prestasi penjerapan grafin oksida (GO) dan hidrogel manik grafin oksida (HBGO) bagi penyingkiran pewarna organik, metilina biru (MB) daripada larutan akueus. Grafin Oksida (GO), dihasilkan menggunakan kaedah Hummer yang mudah dan manik hidrogel telah dihasilkan dengan menggunakan kaedah pra- penyejukkan. Permukaan GO dan HBGO dicirikan menggunakan Mikroskop Transmisi Elektro (TEM) & Field Pelepasan Imbasan Elektron Mikroskop (FESEM) masing-masing dan kedua-dua sampel telah dianalisis dengan menggunakan analisis Termogravimetri (TGA) untuk membandingkan kekonduksian terma. Fourier (FTIR) telah digunakan untuk mengenal pasti kumpulan berfungsi kedua-dua sampel. Kinetik penjerapan dan kajian isoterma telah dijalankan di bawah keadaan yang berbeza (pH = 3-9 dan MB kepekatan = 200-600 mg/L) untuk memeriksa kecekapan penjerapan GO dan HBGO ke arah MB dalam larutan akueus. Keputusan yang dicapai menunjukkan kapasiti penjerapan maksimum HBGO ke arah MB boleh mencapai sehingga ~ 450 mg/g bagi penjerapan pada 300 mg/L MB. Sementara GO mempunyai maksimum kapasiti penjerapan ~ 700 mg/g. Kinetik penjerapan data dianalisis dengan menggunakan model kinetik yang berbeza untuk menyiasat sifat penjerapan MB di GO dan HBGO. Kedua-dua data kinetik penjerapan telah didapati lebih berpadanan dengan model kinetik pseudo-tertib kedua berbanding model pseudo-tertib pertama. Sementara itu, soterma penjerapan telah dianalisis dengan menggunakan model Freundlich dan Langmuir. Data keseimbangan penjerapan lebih berpadanan dengan isoterma Langmuir. Ini menjelaskan bahawa penyerapan MB pada grafin oksida telah membentuk penyerapan satu lapisan.,Master of Science
Pages:	86
Call Number:	TA455.G65N846 2014 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Science and Technology / Fakulti Sains dan Teknologi

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.