Dr. Varong Pavarajarn

ดร. วรงค์ ปวราจารย์

Education : Ph.D., Chemical Engineering, Oregon State University, USA., 2002 M.S., Chemical Engineering (Minor in Industrial Engineering), Oregon State University, USA., 1996 B.Eng., Chemical Engineering, Chulalongkorn University, Thailand, 1992

Address

Department of Chemical Engineering, 11th Floor, Building 4,
Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

varong.p@chula.ac.th

Research profile

02-218-6890

02-218-6877

Research Interest

My research background is in the synthesis of inorganic materials, especially nanomaterials, via various techniques. Examples include fabrication of flexible ceramic nanofibers by electrospinning. My work has shifted toward incorporation of nanostructured materials in micro-scaled channel for various applications and the use of microchannel to investigate reaction mechanisms.

Highlights

  • Synthesis of photocatalysts, such as TiO2 or ZnO, in form of flexible nanofibers
  • Mechanistic study of surface-dependent adsorption on kinetics, reaction intermediates, and reaction pathway for photocatalytic degradation of residual herbicides in water
  • Electrochemical advanced oxidation in a microreactor for remediation of contaminated water
  • Simultaneous separation and recovery of metal ion by a novel nanofiber-supported liquid membrane operated in a microchannel

Expertise

Nanostructured materials synthesis

Chemical reaction in microchannel

Advanced oxidation process

Research Groups

Center of Excellence in Particle and Material Processing Technology

Publications

Dokmai, V., Sinthiptharakoon, K., Phuthong, W., Pavarajarn, V. Anisotropic robustness of talc particles after surface modifications probed by atomic force microscopy force spectroscopy, 2021, Particuology.

Jarudrungchawalit, P.| Prammanasudh, P.| Chandrasardula, P.| Tuchinda, P.| Pavarajarn, V.| Viphavakit, C. Development of UV-enhanced Photocatalytic Microchannel Optical Waveguide for Water Treatment, 2020, 17th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2020, 271-4.

Bumroongsakulsawat, P.| Khongthon, W.| Pavarajarn, V. Degradation of diuron in water by electrochemical advanced oxidation in a microreactor: Effects of anion contamination on degradation and toxicity, 2020, Journal of Environmental Chemical Engineering 8(4), 103824.

Dokmai, V.| Kundhikanjana, W.| Chanlek, N.| Sinthiptharakoon, K.| Sae-Ueng, U.| Phuthong, W.| Pavarajarn, V. Effects of catalyst surfaces on adsorption revealed by atomic force microscope force spectroscopy: Photocatalytic degradation of diuron over zinc oxide, 2020, Physical Chemistry Chemical Physics 22(26), 15035-47.

Dokmai, V., Kundhikanjana, W., Chanlek, N., Sinthiptharakoon, K., Sea-Uend, U., Phuthong, W., Pavarajarn, V. Effects of catalyst surfaces on adsorption revealed by atomic force microscope force spectroscopy: Photocatalytic degradation of diuron over zinc oxide , 2020, Physical Chemistry Chemical Physics 22, 15035-15047.

Charoenpong, P., Pavarajarn, V. Use of metal mesh to assist the multi-phase reaction in a microreactor , 2020, IOP Conference Series: Materials Science and Engineering 778, 012065.

Methaapanon R., Chutchakul K., Pavarajarn V. Photocatalytic zinc oxide on flexible polyacrylonitrile nanofibers via sol–gel coaxial electrospinning. 2020.  Ceramics International, 46 (6), 8287-8292.

Kaewsaenee J., Duriyasart F., Pavarajarn V. Fabrication of flexible titania/polyacrylonitrile co-axial nanofibers via electrospinning. 2020. Journal of Asian Ceramic Societies, 8 (1), 203-210.

Dokmai, V., Methaapanon, R., Pavarajarn, V. Corrosion of amorphous alumina in deionized water under mild condition. 2020. Applied Surface Science, 499, 143906.

Meephon, S., Rungrotmongkol, T., Puttamat, S., Praserthdam, S., Pavarajarn, V. Heterogeneous photocatalytic degradation of diuron on zinc oxide: Influence of surface-dependent adsorption on kinetics, degradation pathway, and toxicity of intermediates. 2019. Journal of Environmental Sciences, 84, 97-111.

Banjerdteerakul, K., Vas-Umnuay, P., Pavarajarn, V. Synthesis of mesoporous tin dioxide via sol-gel process assisted by resorcinol–formaldehyde gel. 2018. Particuology, 37, 26-32.

Meephon, S., Rungrotmongkol, T., Kaiyawet, N., Puttamat, S., Pavarajarn, V. Surface-dependence of adsorption and its influence on heterogeneous photocatalytic reaction: A case of photocatalytic degradation of linuron on zinc oxide. (2018). Catalysis Letters, 148 (3), 873-881.

Meephon, S., Puttamat, S., Pavarajarn, V. Dependence of Catalyst Surface in Photocatalytic Degradation of Phenyl Urea Herbicides. (2018). Engineering Journal, 22 (5), 57-66.

Sutaporn Meephon, Thanyada Rungrotmongkol, Somchintana Puttamat, Supareak Praserthdam, Varong Pavarajarn Heterogeneous photocatalytic degradation of diuron on zinc oxide: Influence of surface-dependent adsorption on kinetics, degradation pathway, and toxicity of intermediates. 2019. Journal of Environmental Sciences 84 , 97-111.

Meechoonuck, M., Vas-Umnuay, P., Pavarajarn, V. Synthesis of porous silicon nitride using silica/carbon composite derived from phenol-resorcinol-formaldehyde gel. 2016. Ceramics International 42 (9) , 10879-10885.

Khongthon, W., Jovanovic, G., Yokochi, A., Sangvanich, P., Pavarajarn, V. Degradation of diuron via an electrochemical advanced oxidation process in a microscale-based reactor. 2016. Chemical Engineering Journal 292 , 298-307.

Kongpanna, P., Babi, D., Pavarajarn, V., Assabumrungrat, S., Gani, R. Systematic methods and tools for design of sustainable chemical processes for CO2 utilization. 2016. Computers and Chemical Engineering 87 , 125-144.

Frauzem, R., Kongpanna, P., Roh, K., Lee, J., Pavarajarn, V., Assabumrungrat, S., Gani, R. Sustainable Process Design: Sustainable Process Networks for Carbon Dioxide Conversion. 2015. Computer Aided Chemical Engineering 36 , 175-195.

Kongpanna, P., Pavarajarn, V., Gani, R., Assabumrungrat, S. Techno-economic evaluation of different CO2-based processes for dimethyl carbonate production. 2015. Chemical Engineering Research and Design 93 , 496-510.

Yahom, A., Powell, J., Pavarajarn, V., Onbhuddha, P., Charojrochkul, S., Assabumrungrat, S. Simulation and thermodynamic analysis of chemical looping reforming and CO2 enhanced chemical looping reforming. 2014. Chemical Engineering Research and Design 92 (11) , 2575-2583.

Chantam, P., Pavarajarn, V. Synthesis of porous alumina assisted by resorcinol-formaldehyde gel. 2012. Journal of the American Ceramic Society 95 (9) , 2788-2790.

Charnhattakorn, B., Charinpanitkul, T., Sirisuk, A., Pavarajarn, V. Controlled synthesis of defects-containing ZnO by the French process modified with pulsed injection and its luminescence properties. 2011. Ceramics International 37 (6) , 2021-2024.

Kaewsaenee, J., Visal-athaphand, P., Supaphol, P., Pavarajarn, V. Effects of magnesium and zirconium dopants on characteristics of titanium(IV) oxide fibers prepared by combined Sol-Gel and electrospinning techniques. 2011. Industrial and Engineering Chemistry Research 50 (13) , 8042-8049.

Kaewsaenee, J., Visal-athaphand, P., Supaphol, P., Pavarajarn, V. Fabrication and characterization of neat and aluminium-doped titanium (IV) oxide fibers prepared by combined sol-gel and electrospinning techniques. 2010. Ceramics International 36 (7) , 2055-2061.

Kamlangkla, K., Paosawatyanyong, B., Pavarajarn, V., Hodak, J., Hodak, S. Mechanical strength and hydrophobicity of cotton fabric after SF6 plasma treatment. 2010. Applied Surface Science 256 (20) , 5888-5897.

Pavarajarn, V., Precharyutasin, R., Praserthdam, P. Synthesis of silicon nitride fibers by the carbothermal reduction and nitridation of rice husk ash. 2010. Journal of the American Ceramic Society 93 (4) , 973-979.

Klanwan, J., Akrapattangkul, N., Pavarajarn, V., Seto, T., Otani, Y., Charinpanitkul, T. Single-step synthesis of MWCNT/ZnO nanocomposite using co-chemical vapor deposition method. 2010. Materials Letters 64 (1) , 80-82.

Sangkhaprom, N., Supaphol, P., Pavarajarn, V. Fibrous zinc oxide prepared by combined electrospinning and solvothermal techniques. 2010. Ceramics International 36 (1) , 357-363.

Promdej, C., Pavarajarn, V., Wada, S., Wasanapiarnpong, T., Charinpanitkul, T. Effect of hot isostatically pressed sintering on microstructure of translucent alumina compact. 2009. Current Applied Physics 9 (5) , 960-966.

Kasemsuwan, K., Suvewong, T., Pavarajarn, V., Thanachayanont, C. Influence of ZnO Content on film morphology and device performance of MEH-PPV/ZnO hybrid solar cells. 2008. Advanced Materials Research 55-57 , 325-328.

Hodak, S., Supasai, T., Paosawatyanyong, B., Kamlangkla, K., Pavarajarn, V. Enhancement of the hydrophobicity of silk fabrics by SF6 plasma. 2008. Applied Surface Science 254 (15) , 4744-4749.

Paosawatyanyong, B., Supasai, T., Pavarajarn, V., Hodak, S. Hydrophobicity improvement of PET fabrics after SF6 plasma treatment. 2008. International Polymer Processing 23 (2) , 134-139.

Luyjew, K., Tonanon, N., Pavarajarn, V. Mesoporous silicon nitride synthesis via the carbothermal reduction and nitridation of carbonized silica/RF gel composite. 2008. Journal of the American Ceramic Society 91 (4) , 1365-1368.

PROMDEJ, C., AREERAKSAKUL, S., PAVARAJARN, V., WADA, S., WASANAPIARNPONG, T., CHARINPANITKUL, T. Preparation of translucent alumina ceramic specimen using slip casting method. 2008. Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan 116 (1351) , 409-413.

Tonto, P., Mekasuwandumrong, O., Phatanasri, S., Pavarajarn, V., Praserthdam, P. Preparation of ZnO nanorod by solvothermal reaction of zinc acetate in various alcohols. 2008. Ceramics International 34 (1) , 57-62.

Watthanaarun, J., Supaphol, P., Pavarajarn, V. Photocatalytic activity of neat and silicon-doped titanium(IV) oxide nanofibers prepared by combined Sol-Gel and electrospinning techniques. 2007. Journal of Nanoscience and Nanotechnology 7 (7) , 2443-2450.

Pavarajarn, V., Vongthavorn, T., Praserthdam, P. Enhancement of direct nitridation of silicon by common metals in silicon nitride processing. 2007. Ceramics International 33 (4) , 675-680.

Mekasuwandumrong, O., Pavarajarn, V., Inoue, M., Praserthdam, P. Preparation and phase transformation behavior of χ-alumina via solvothermal synthesis. 2006. Materials Chemistry and Physics 100 (2-3) , 445-450.

Kunjara Na Ayudhya, S., Tonto, P., Mekasuwandumrong, O., Pavarajarn, V., Praserthdam, P. Solvothermal synthesis of ZnO with various aspect ratios using organic solvents. 2006. Crystal Growth and Design 6 (11) , 2446-2450.

Klongdee, J., Petchkroh, W., Phuempoonsathaporn, K., Praserthdam, P., Vangnai, A., Pavarajarn, V. Activity of nanosized titania synthesized from thermal decomposition of titanium (IV) n-butoxide for the photocatalytic degradation of diuron. 2005. Science and Technology of Advanced Materials 6 (3-4 SPEC. ISS.) , 290-295.

Watthanaarun, J., Pavarajarn, V., Supaphol, P. Titanium (IV) oxide nanofibers by combined sol-gel and electrospinning techniques: Preliminary report on effects of preparation conditions and secondary metal dopant. 2005. Science and Technology of Advanced Materials 6 (3-4 SPEC. ISS.) , 240-245.

Sangtongkitcharoen, W., Assabumrungrat, S., Pavarajarn, V., Laosiripojana, N., Praserthdam, P. Comparison of carbon formation boundary in different modes of solid oxide fuel cells fueled by methane. 2005. Journal of Power Sources 142 (1-2) , 75-80.

Payakgul, W., Mekasuwandumrong, O., Pavarajarn, V., Praserthdam, P. Effects of reaction medium on the synthesis of TiO2 nanocrystals by thermal decomposition of titanium (IV) n-butoxide. 2005. Ceramics International 31 (3) , 391-397.

Assabumrungrat, S., Laosiripojana, N., Pavarajarn, V., Sangtongkitcharoen, W., Tangjitmatee, A., Praserthdam, P. Thermodynamic analysis of carbon formation in a solid oxide fuel cell with a direct internal reformer fuelled by methanol. 2005. Journal of Power Sources 139 (1-2) , 55-60.

Assabumrungrat, S., Pavarajarn, V., Charojrochkul, S., Laosiripojana, N. Thermodynamic analysis for a solid oxide fuel cell with direct internal reforming fueled by ethanol. 2004. Chemical Engineering Science 59 (24) , 6015-6020.

Mekasuwandumrong, O., Praserthdam, P., Inoue, M., Pavarajarn, V., Tanakulrungsank, W. Phase transformation behavior of nanocrystalline χ-alumina powder obtained by thermal decomposition of AIP in inert organic solvent. 2004. Journal of Materials Science 39 (7) , 2417-2421.

Praserthdam, P., Silveston, P., Mekasuwandumrong, O., Pavarajarn, V., Phungphadung, J., Somrang, P. A New Correlation for the Effects of the Crystallite Size and Calcination Temperature on the Single Metal Oxides and Spinel Oxides Nanocrystal. 2004. Crystal Growth and Design 4 (1) , 39-43.

Mekasuwandumrong, O., Silveston, P., Praserthdam, P., Inoue, M., Pavarajarn, V., Tanakulrungsank, W. Synthesis of thermally stable micro spherical χ-alumina by thermal decomposition of aluminum isopropoxide in mineral oil. 2003. Inorganic Chemistry Communications 6 (7) , 930-934.

Pavarajarn, V., Kimura, S. Catalytic Effects of Metals on Direct Nitridation of Silicon. 2001. Journal of the American Ceramic Society 84 (8) , 1669-1674.