All publications

Synthesis and Characterization of Fe/SUZ-4 Zeolite

Suthat Turapan, Paisan Kongkachuichay, Patcharin Worathanakul

Procedia Engineering · 2012

The synthesized Fe/SUZ-4 zeolites using conventional ion exchange method. K/SUZ-4 zeolite was prepared with SiO2:Al2O3 molar ratio of 21.2 under hydrothermal process at 150 °C for 4 days using tetraethylammonium hydroxide (TEAOH) as a template. Different amounts of Fe(II) were loaded in the synthesized K/SUZ-4 with different weight percentages:1, 3, 5, 8 and 10. Fe/SUZ-4 zeolite were investigated using atomic absorption spectroscopy (AAS), X-ray powder diffraction (XRD), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS). The results show structures of Fe/SUZ-4 zeolites still have a narrow pore size distribution and needle-shaped crystal.

Utilization Biomass from Bagasse Ash for Phillipsite Zeolite Synthesis

Patcharin Worathanakul, Kittipalarak Sriamporn, Anusarn Kanokkan

Advanced materials research · 2011

Bagasse ash is one of the agricultural wastes and valuable biomass by-products in sugar milling. It was treated hydrothermally with hydrochloric aqueous solution at 100 °C and burned at 600°C for 2 hours under oxygen feeding. The obtained white ash was further used as natural silica source instead of silica sol because of highly silica content from an abundant supply of sugar industries in Thailand. Aluminosilicate precursor gel was prepared from alumina source and silica source via sodium silicate preparation. Different crystallization time was studied for the molar ratio of SiO2/Al2O3 = 2 at 100°C crystallization temperature. The phillipsite zeolite synthesized was characterized using various techniques; X-ray diffraction, Scanning electron microscopy, Fourier Transform Infrared Spectroscopy, and BET-N2 adsorption method. The results can be used as value added for bagasse ash utilization, minimize the environmental impact of disposal problems and further application for heavy metal removal.

Effect of sol–gel synthesis parameters and Cu loading on the physicochemical properties of a new SUZ-4 zeolite

Patcharin Worathanakul, Dusadee Trisuwan, Amarin Phatruk, Paisan Kongkachuichay

Colloids and Surfaces A Physicochemical and Engineering Aspects · 2011

Characterization For Post-Treatment Effect Of Bagasse Ash For Silica Extraction

Patcharin Worathanakul, Wisaroot Payubnop, Akhapon Muangpet

2009

Utilization of bagasse ash for silica sources is one of the most common application for agricultural wastes and valuable biomass byproducts in sugar milling. The high percentage silica content from bagasse ash was used as silica source for sodium silicate solution. Different heating temperature, time and acid treatment were studies for silica extraction. The silica was characterized using various techniques including X-ray fluorescence, X-ray diffraction, Scanning electron microscopy, and Fourier Transform Infrared Spectroscopy method,. The synthesis conditions were optimized to obtain the bagasse ash with the maximum silica content. The silica content of 91.57 percent was achieved from heating of bagasse ash at 600°C for 3 hours under oxygen feeding and HCl treatment. The result can be used as value added for bagasse ash utilization and minimize the environmental impact of disposal problems.

Quench-Ring Assisted Flame Synthesis of SiO2-TiO2 Nanostructured Composite

Patcharin Worathanakul, Jingkun Jiang, Pratim Biswas, Paisan Kongkachuichay

Journal of Nanoscience and Nanotechnology · 2008

A flame aerosol reactor (FLAR) was used to synthesize SiO2-based nanocomposite materials of SiO2-TiO2 in different precursor molar ratios and quench ring positions. Processing conditions were determined that resulted in formation of different crystal phases at different precursor concentration molar ratios. The results showed that the addition of SiO2 inhibited TiO2 phase transformation from anatase to rutile. The different morphology of SiO2-TiO2 nanocomposite was primarily the result of changing the quench ring position. Quenching can stop the growth kinetics, and this was obtained by locating the quench ring at different positions in the particle formation process. At a lower position, a binary mixture of SiO2-TiO2 was obtained in a core–shell structure. The difference in residence time for sintering and coalescence yielded different morphologies of SiO2-TiO2 nanocomposites. The results from FTIR confirmed Si-O-Ti bonding for all samples. The samples of SiO2-TiO2 exhibited better suspension in liquid than pure TiO2 as confirmed by zeta potential measurements.

New Suz-4 Zeolite Membrane From Sol-Gel Technique

Patcharin Worathanakul, Paisan Kongkachuichay

2008

A new SUZ-4 zeolite membrane with tetraethlyammonium hydroxide as the template was fabricated on mullite tube via hydrothermal sol-gel synthesis in a rotating autoclave reactor. The suitable synthesis condition was SiO2:Al2O3 ratio of 21.2 for 4 days at 155 °C crystallization under autogenous pressure. The obtained SUZ-4 possessed a high BET surface area of 396.4 m2/g, total pore volume at 2.611 cm3/g, and narrow pore size distribution with 97 nm mean diameter and 760 nm long of needle crystal shape. The SUZ-4 layer obtained from seeding crystallization was thicker than that of without seeds or in situ crystallization.

Evaluation of Nanostructured Sorbents in Differential Bed Reactors for Elemental Mercury Capture

Patcharin Worathanakul, Paisan Kongkachuichay, James D. Noel, Achariya Suriyawong, Daniel E. Giammar, Pratim Biswas

Environmental Engineering Science · 2008

Elemental mercury (Hg0 ) capture by heterogeneous gas–solid reaction with nanostructured sorbents was studied in a differential bed reactor system at room temperature. Commercially available (four types of iron oxide, titanium dioxide, titania pillared clay) and in-house synthesized (magnetite and SUZ-4 zeolite) sorbents were studied. Elemental mercury capture efficiency greater than 70% was observed for TiO2, TiO2 pillared clay (PILC), SUZ-4 zeolite, and one of the commercial iron oxides on irradiation with UV light for an inlet mercury concentration of 75 ± 1.9 μg/m3. The initial rate of Hg0 capture per unit mass of sorbent was highest for TiO2. The initial capture rates, rinit = kS0 (1-x)CαHg,0, were determined with α values of 1.03, 1.21, 1.19, and 1.51 for TiO2, TiO2 PILC, SUZ-4 zeolite, and one of the commercial iron oxides, respectively. In addition, the rate constants (k) were found to be 2.43×10−17, 4.66×10−19, 3.41×10−20 and 8.6×10−20μg1-α m3α-2 s−1 for TiO2, TiO2 PILC, SUZ-4 zeolite, and one of the commercial iron oxides, respectively. A three-step sequential extraction technique, targeting surface bound, acid-soluble, and encapsulated mercury species, was used to investigate the binding mechanisms and the mobility of mercury. The mercury associated with one of the commercial iron oxides was more labile than the mercury associated with the other sorbents. Titania (TiO2) shows the greatest potential to be used as a sorbent to capture elemental mercury on irradiation with UV light based on the results of this study.