Chaiyaraksa, Chompoonut

Preferred name

Alternative Name

Chaiyaraksa, C.

Main Affiliation

School of Science

chompoonut.ch@kmitl.ac.th

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Adsorption of direct red 83 using cetyltrimethylammonium bromide modified water hyacinth
(2018-01-01)
Chaiyaraksa, Chompoonut
;
Chomphatho, Sarunya
;
Phaophuetphan, Sutthikarn
;
Champa, Onnadda
As of present, water pollution that is caused by textile dyeing factories is one of the primary concerns in Thailand. Wastewater is contaminated with dyes, which results in an unpleasant watercolor. This research emphasized on the study of the adsorption of Direct Red 83 dye through the use of water hyacinths, which are abundant in number and can be easily obtained. Prior to the adsorption, water hyacinths were modified with cetyltrimetylammonium bromide (CTAB). The value of pHpzc of the adsorbent was 5.15. The adsorption was most effective at the pH value of 3. After increasing the amount of adsorbent and the temperature for water treatment, the percentage of dye removal would increase. However, if the concentration of dye increases, the percentage of dye removal would decrease. Upon the addition of electrolytes into the Wastewater that contained this particular type of dye, it was found that calcium salts lowered the percentage of dye removal to a greater extent than sodium salts. The process of adsorption was in accordance with Langmuir adsorption model, with qe value equals to 66.2252 milligrams per gram, KL value equals to 1.6064 liters per milligram, and RL value equals to 0.0062. Based on Dubinin-Radushkevich equation, the obtained E value represents physical adsorption. According to Redlich-Peterson equation, bR equals to 1.0797, which supported the fact that adsorption conformed to Langmuir model. This adsorption was in accordance with the model of a second-order reaction. When the temperature of the Wastewater increases, K2 value would increase. When the concentration of dye increases, qe value would increase.
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Acid soil amendment by zeolite, sepiolite and diatomite
(2019-01-01)
Chaiyaraksa, Chompoonut
;
Tumtong, Mintra
The aim of this research was to reduce the heavy metal movement to the biosystem using clay minerals including zeolite, sepiolite, and diatomite. The clay soil and sandy loam soil were made contaminated with 200, 350, 700, and 250 mg of Zn, Cu, Cr, and Ni per kg of soil, respectively. The ratio of clay minerals added to soils was 2.5%, 5%, and 7.5%. The determination of various forms of heavy metals bound to soil mixed with clay minerals and left for a period of 30 and 60 days was carried out using the sequential extraction method. The results indicated that Ni and Zn were mostly in an exchangeable form, while Cu and Cr were mostly in an oxide bound form and an organically bound form. The pH of the soils increased after adding clay minerals. Diatomite caused the smallest change in the pH value. Chromium had the best adsorption capacity by bonding with various elements in the soil, followed by Cu, Zn, and Ni, respectively. The addition of sepiolite caused more heavy metals in a stable form than adding zeolite and diatomite. When adding clay minerals to both types of soil, the highest impact was on Ni, followed by Zn, Cu, and Cr, respectively. The bioavailable index (BI) value was the least when adding sepiolite. The risk of heavy metals moving to the biosystem was lower when increasing the incubation time. Without adding any clay mineral, the BI value of metals in the sandy clay loam soil was higher than that in the clay soil.
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Adsorption of cationic and anionic dye using modified pineapple peel
(2019-01-01)
Chaiyaraksa, Chompoonut
;
Ruenroeng, Chanyapat
;
Buaphuan, Bunyisa
;
Choksakul, Sidaporn
This research used leftover pineapple peel from a fruit shop to adsorb Basic Red 9 dye and Direct Red 83 dye. Pineapple peel was modified with 1.25 M calcium chloride before conducting adsorption experiments. The studied parameters that affect adsorption efficiency included time, pH, adsorbent quantity, dye concentration in the wastewater, and temperature. Both dyes showed the best adsorption at pH 7. Basic Red 9 and Direct Red 83 took 60 and 90 min, respectively, to reach equilibrium reactions. As the quantity of pineapple peel increased, the adsorption capacity increased. Temperature slightly affected the dye adsorption. The adsorption isotherms of Basic Red 9 and Direct Red 83 followed the Temkin and Freundlichad sorption models, whereas the adsorption kinetics of the two were consistent with the pseudo-second-order equation. The adsorption was endothermic and spontaneous.
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Adsorption of copper (II) and nickel (II) by chemical modified magnetic biochar derived from eichhornia crassipes
(2019-05-01)
Chaiyaraksa, Chompoonut
;
Boonyakiat, Watcharapol
;
Bukkontod, Wannisa
;
Ngakom, Wanvisa
A heavy metal contamination problem in Thailand is an important issue that needs to be addressed urgently, particularly contaminated in water. Heavy metal contamination in water can spread to other environments faster. This research aims to apply chitosan-magnetic biochar synthesized from water hyacinth in order to solve the problem of copper and nickel contaminated in water. Data from SEM indicated that chitosan-magnetic biochar had a smoother surface and had smaller holes than the magnetic biochar. When tested with Autosorb-1, results indicated that the adsorbent with chitosan had a slightly lower porosity compared to without chitosan. Data from FTIR found evidence of chitosan on the adsorbent. According to the XRD study, peaks of iron oxide presented. The point of zero charges (pH<inf>PZC</inf>) of chitosan-magnetic biochar was 7.03. The adsorption isotherms, kinetics, and thermodynamics were observed. The adsorption of both Cu and Ni followed Langmuir isotherm. The value of q<inf>max</inf> for Cu was 38.4615 mg/g and for Ni was 0.4858 mg/g. The R<sup>2</sup> value of Dubinin-Radushkevich isotherm was also high. The E value of Cu and Ni was 0.316 kJ/mol and 1.8962 kJ/mol, respectively. The best-fitting kinetic model for Cu was the pseudo-second-order model and for Ni was the intra-particle diffusion. The adsorption was an endothermic process. The process was spontaneous at high temperatures and non-spontaneous at low temperatures.
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Mobility retardation of Cd, Pb and Mn in acid soil using phosphate fertilizers
(2019-05-01)
Chaiyaraksa, Chompoonut
;
Rodsa, Natthanan
Contamination of heavy metals in soil is a major problem that causes damage to the environments. The aim of this research was to observe the efficiency of phosphate fertilizer, including phosphate rock, di-ammonium phosphate, and monopotassium phosphate in stabilizing lead, cadmium, and manganese in contaminated soil. The sampling soil was an acid sandy clay loam soil from Rayong Province which is one of the most industrialized provinces in Thailand. After applying fertilizers to the soil, the determination was on soil pH, the total concentration of heavy metals, heavy metal forms in soil and potential of heavy metals to enter the biological system. The results showed that phosphate rock, diammonium phosphate, and monopotassium phosphate increased the soil pH from 3.60 to 6.5, 7.0 and 5.2, respectively. Phosphate fertilizers could change an unstable form to a more stable form of heavy metals. Phosphate rock (7.5 g/kg<inf>soil</inf>) has the highest potential for reducing the mobility of all three metals (about 80% for manganese, 60% for cadmium, and 50% for lead), followed by monopotassium phosphate. The results obtained from the extraction with DTPA and CaCl<inf>2</inf> were closely related to the results obtained from the sequential extraction method. Phosphate rock was the best to reduce potentially toxic metals phytoavailability. Soil improvement with phosphate fertilizer was considered a good alternative for stabilizing soils contaminated with cadmium, lead, and manganese.

Chaiyaraksa, Chompoonut

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