Browsing by Author "Paitip Thiravetyan"
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Item A reinvestigation of EXAFS and EPR spectroscopic measurements of chromium(VI) reduction by coir pith(2010) Parinda Suksabye; Niramon Worasith; Paitip Thiravetyan; Akira Nakajima; Bernard A. Goodman; B.A. Goodman; Health and Environment Department, Unit of Environmental Resources and Technologies, Austrian Institute of Technology, Seibersdorf A-2444, Austria; email: bernard_a_goodman@yahoo.comNew measurements using extended X-ray absorption fine structure (EXAFS) and electron paramagnetic resonance (EPR) techniques are consistent with Cr in the Cr(III) oxidation state as the main product from the adsorption of Cr(VI) on coir pith. These confirm the previous X-ray measurements, but differ from the results of previous EPR studies, which indicated that Cr(V) was the main form of Cr. The reason for this discrepancy is the presence of a broad signal from Cr(III) in an unsymmetrical environment that was missed previously; the Cr(V) component is in fact only a minor reaction product. As a result of this problem with spectral acquisition and interpretation, some simple recommendations are presented for conducting EPR investigations on natural systems. © 2010.Item Benzene adsorption by plant leaf materials: Effect of quantity and composition of wax(2013) Chairat Treesubsuntorn; Parinda Suksabye; Sawitree Weangjun; Fonthip Pawana; Paitip Thiravetyan; P. Thiravetyan; School of Bioresources and Technology, King Mongkut's, University of Technology Thonburi, Bangkok 10150, Thailand; email: paitip.thi@kmutt.ac.thTwenty-one plant leaf materials were screened for benzene adsorption efficiency in the static system, and the leaf material from Dieffenbachia picta, Acrostichum aureum, Ficus religiosa, Lagerstroemia macrocarpa, Alstonia scholaris, and Dracaena sanderiana were found to have high potential for benzene removal. The relation between quantity and composition of wax to benzene removal efficiency was studied. Although high quantities of wax occurred in some leaf materials, low benzene removal was clearly found if compared with other plant materials with the same wax quantity. Alpha-linoleic acid and dodecyl cyclohexane were found to be the main composition in plant leaf materials with high benzene adsorption, and it might be a key factor for benzene removal. © Springer Science+Business Media Dordrecht 2013.Item Cleanup of trimethylamine (fishy odor) from contaminated air by various species of Sansevieria spp. and their leaf materials(Taylor and Francis Inc., 2016) Phattara Boraphech; Parinda Suksabye; Nipaporn Kulinfra; Wascharangkoon Kongsang; Paitip Thiravetyan; P. Thiravetyan; School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand; email: paitip.thi@kmutt.ac.thRemoval of trimethylamine (TMA) by 10 different living Sansevieria spp. and their dried leaf materials was studied. The results showed that living Sansevieria kirkii was the most effective plant while Sansevieria masoniana was the least effective in TMA removal. Two major pathways were involved in stomata opening and epicuticular wax on the leaf surface. In the presence of TMA, the stomata opening in Sansevieria spp. was induced, which enhanced TMA removal under light conditions. Dried leaf powders of Sansevieria spp. adsorbed TMA through their waxes. Therefore, both living and non-living Sansevieria spp. can be effectively used for removal of TMA. � 2016 Taylor & Francis Group, LLC.Item Cr(VI) adsorption from electroplating plating wastewater by chemically modified coir pith(Academic Press, 2012) Parinda Suksabye; Paitip Thiravetyan; P. Thiravetyan; Division of Biotechnology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok 10150, Thailand; email: paitip.thi@kmutt.ac.thCoir pith samples were chemically modified by grafting with acrylic acid for the removal of Cr(VI) from electroplating wastewater. The presence of acrylic acid on the coir pith surface was verified by a scanning electron microscope with an electron dispersive x-ray spectrometer (SEM/EDX), Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TG). The carbonyl groups (CO) from the carboxylic acids (COOH) increased on the coir pith surface after grafting with acrylic acid. In addition, the thermal stability of the acrylic acid-grafted coir pith also improved. The optimum conditions for grafting the acrylic acid on the coir pith consisted of 2 M acrylic acid and 0.00125 M ceric ammonium nitrate (CAN, as an initiator). The maximum Cr(VI) removal (99.99 ± 0.07%) was obtained with the following conditions: a 1.3% (w/v) dosage of acrylic acid-grafted coir pith, a system pH of 2, a contact time of 22 h, a temperature of 30 ¡C, a particle size of <150 _m and an initial Cr(VI) of 1,171 mg l-1. At system pH of 2, Cr(VI) in the HCrO4- form can be adsorbed with acrylic acid-grafted coir pith via an electrostatic attraction. The adsorption isotherm of 2 M acrylic acid-grafted coir pith exhibited a good fit with the Langmuir isotherm. The maximum Cr(VI) adsorption capacity of the 2 M acrylic acid-grafted coir pith was 196.00 mg Cr(VI) g-1 adsorbent, whereas for coir pith without grafting, the maximum Cr(VI) removal was 165.00 mg Cr(VI) g-1 adsorbent. The adsorption capacity of the acrylic acid-grafted coir pith for Cr(VI) was higher compared to the original coir pith. This result was due to the enhancement of the carbonyl groups on the coir pith surface that may have involved the mechanism of chromium adsorption. The X-ray absorption near edged structure (XANES) and desorption studies suggested that most of the Cr(III) that presented on the acrylic acid-grafted coir pith was due to the Cr(VI) being reduced to Cr(III) on the adsorbent surface. FTIR confirmed the involvement of the carbonyl groups (CO) and the methoxy groups (OCH3) in the mechanism of chromium adsorption. Thermodynamic study, such as enthalpy (_H), free energy (_G) and entropy change (_S) indicated that the overall adsorption process was endothermic, spontaneous and randomness. In addition, the adsorption process was favored at high temperatures. © 2012 Elsevier Ltd.Item Effect of alumina content and surface area of acid-activated kaolin on bleaching of rice bran oil(Springer Verlag, 2015) Lei Lei Aung; Emmanuel Tertre; Parinda Suksabye; Niramon Worasith; Paitip ThiravetyanThis study investigated the effect of kaolin acid activation on alumina losses, surface area changes and oil bleaching performance. Ground kaolin was treated with hydrochloric or citric acid, and bleaching tests were performed on rice bran oil. The adsorption studies showed that the optimal bleaching of ~83 or ~81 % were achieved by activation with 0.5 M hydrochloric or citric acid, respectively, whereas bleaching with a commercial clay was ~82 %. The highest bleaching value was not associated with the maximum clay surface area or porosity. X-ray fluorescence showed that alumina contents of 31-34 % were suggestive for optimum bleaching depending on the different acid used. Treating ground kaolin with the same hydrochloric acid strength by varying the acid concentration and clay/acid ratio also confirmed that the best Al3+ content was ~32 %, and a value lower than one indicated the extensively destruction of kaolinite proportions leading to a decrease in its bleaching capacity, even though it had the maximum surface area. The decrease in capacity was due to the reduction of alumina content, and the parallel formation of high amorphous silica was favorable for the adsorption of anionic pigments, such as chlorophyll-a. � 2014 AOCS.Item Effect of biochars and microorganisms on cadmium accumulation in rice grains grown in Cd-contaminated soil(Springer Verlag, 2016) Parinda Suksabye; Apinya Pimthong; Prapai Dhurakit; Phenjun Mekvichitsaeng; Paitip Thiravetyan; P. Thiravetyan; School of Bioresources and Technology, King Mongkut�s University of Technology Thonburi, Bangkok, 10150, Thailand; email: paitip.thi@kmutt.ac.thCadmium (Cd) contaminated in rice grains is a serious problem because most Asians consume rice on a daily basis. Rice grown in Cd-contaminated soil normally did not have high concentration of Cd. However, soil samples used in this study had high concentrations of Cd. The purpose of this study was to clearly see the effects of biochar and microorganism addition in rice growing in Cd-contaminated soil. The initial Cd concentration in Cd-contaminated soil used in this study was about 650�mg�kg_1. Cadmium concentration in rice plants grown in Cd-contaminated soil with the addition of 1�% (w/w) different biochars such as sawdust fly ash (SDFA), bagasse fly ash (BGFA), and rice husk ash (RHA) was investigated. The results showed that SDFA was the best biochar in terms of reducing cadmium accumulation in rice grains when compared to BGFA and RHA under the same conditions. In addition, rice plants grown in Cd-contaminated soil with the addition of various nonpathogenic microorganisms, such as Pseudomonas aeruginosa, Bacillus subtilis, and Beauveria bassiana were also studied. The results showed that the addition of 2�% (v/v) microorganisms can reduce Cd accumulation in grains. It was found that grains obtained from Cd-contaminated soil with the addition of P. aeruginosa had the lowest cadmium concentration compared to the ones from soil amended with other strains. This was due to the fact that P. aeruginosa adsorbed more Cd itself into its cells than other strains. The rice plants grown in Cd-contaminated soil with the addition of biochars and microorganisms were also compared. The results showed that adding 2�% (v/v) microorganisms seemed to reduce Cd accumulation in rice grains better than adding 1�% (w/w) biochars. In addition, the amounts of calcium and magnesium in rice grains and the dry weight of plant in Cd-contaminated soil amended with P. aeruginosa were the highest in comparison to other microorganisms, biochars, and the soil without any amendments (Cd-soil control). It might be possible that microorganisms can cause leaching of Ca, Mg, etc. from contaminated soil and compete with Cd to be uptaken by plants. This would cause the increase in plant dry weight and higher mineral nutrients accumulation in grains. Both biochars and microorganisms are suitable for reducing the amount of Cd in rice grains. The application should depend on farmers, biochars available in nearby areas, etc. Therefore, microorganisms and biochars can be used to solve the problem of cadmium contamination in rice grains. � 2015, Springer-Verlag Berlin Heidelberg.Item Erratum to: Effect of alumina content and surface area of acid-activated kaolin on bleaching of rice bran oil(Springer Verlag, 2015) Lei Lei Aung; Emmanuel Tertre; Parinda Suksabye; Niramon Worasith; Paitip Thiravetyan; P. Thiravetyan; Division of Biotechnology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkhuntien, Bangkok, 10150, Thailand; email: paitip.thi@kmutt.ac.th[No abstract available]Item Treatment of chromium contamination in the environment(Nova Science Publishers, Inc., 2011) Paitip Thiravetyan; Parinda Suksabye; P. Thiravetyan; Division of Biotechnology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Thakham, Bangkhuntien, Bangkok, Thailand; email: paitip.thi@kmutt.ac.th[No abstract available]Item Uptake of toluene and ethylbenzene by plants: Removal of volatile indoor air contaminants(2014) Wararat Sriprapat; Parinda Suksabye; Sirintip Areephak; Polawat Klantup; Atcharaphan Waraha; Anuchit Sawattan; Paitip Thiravetyan; P. Thiravetyan; School of Bioresources and Technology, King Mongkutu's University of Technology Thonburi, Bangkok 10150, Thailand; email: paitip.thi@kmutt.ac.thAir borne uptake of toluene and ethylbenzene by twelve plant species was examined. Of the twelve plant species examined, the highest toluene removal was found in Sansevieria trifasciata, while the ethylbenzene removal from air was with Chlorophytum comosum. Toluene and ethylbenzene can penetrate the plant[U+05F3]s cuticle. However, the removal rates do not appear to be correlated with numbers of stomata per plant. It was found that wax of S. trifasciata and Sansevieria hyacinthoides had greater absorption of toluene and ethylbenzene, and it contained high hexadecanoic acid. Hexadecanoic acid might be involved in toluene and ethylbenzene adsorption by cuticles wax of plants. Chlorophyll fluorescence analysis or the potential quantum yield of PSII (Fv/Fm) in toluene exposed plants showed no significant differences between the control and the treated plants, whereas plants exposed to ethylbenzene showed significant differences or those parameters, specifically in Dracaena deremensis (Lemon lime), Dracaena sanderiana, Kalanchoe blossfeldiana, and Cordyline fruticosa. The Fv/Fm ratio can give insight into the ability of plants to tolerate (indoor) air pollution by volatile organic chemicals (VOC). This index can be used for identification of suitable plants for treating/sequestering VOCs in contaminated air. © 2014 Elsevier Inc.Item Using "activated carbon from bagasse" for color removal(Nova Science Publishers, Inc., 2011) Paitip Thiravetyan; Parinda Suksabye; P. Thiravetyan; Division of Biotechnology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Thakham, Bangkhuntien, Bangkok, Thailand; email: paitip.thi@kmutt.ac.th[No abstract available]Item Using Kaolin in Reduction of Arsenic in Rice Grains: Effect of Different Types of Kaolin, pH and Arsenic Complex(Springer New York LLC, 2016) Suteera Arnamwong; Parinda Suksabye; Paitip Thiravetyan; P. Thiravetyan; School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand; email: paitip.thi@kmutt.ac.thKaolin was used as a soil amendment to study the effect of different types of kaolin, pH and arsenic complex on arsenic accumulation in rice grains from arsenic (As) contaminated soil. It was found that kaolin released soluble aluminium (Al) and silicon at a pH value of 3. As adsorption by crude kaolin was higher than by washed kaolin and treated kaolin due to the higher Al content found in crude kaolin. Furthermore, the addition of 5 % (w/w) crude kaolin in the solution of As-contaminated soil was able to reduce water-soluble As in the solution. In mesocosm experiments, As accumulation in rice grain was not found under the addition of kaolin conditions. Scanning electron microscopy with energy dispersive X-ray spectroscopy study found the crystallinity of Al-As complex in plant roots. This implies that while kaolin adsorbs As from As-contaminated soil, rice plants also simultaneously take up As and Al into their cells. This caused the decrease in As accumulation in rice grain. � 2016 Springer Science+Business Media New York.