Pakin Noppawan

Corn Stover-Derived Lewis Acid Carbon Catalyst for Efficient Hantzsch Synthesis of 1,4-Dihydropyridines

Kanyaphat Torboon, Chatthai Kaewtong, Supinya Nijpanich, Nopbhasinthu Patdhanagul et autres

Abstract The development of sustainable heterogeneous catalysts from renewable biomass is an important strategy for advancing green organic synthesis. In this work, a series of Lewis acid carbon catalysts were prepared from corn stover via AlCl3-assisted activation and thermal carbonization. The optimized …

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Synergistic dark and visible-light-driven catalytic degradation of organic dyes over defect-engineered CuO nanoparticles

Paveena Laokul, Suchanya Ruangjan, Luriya Chokbandit, Chonthicha Kaewjan et autres

Corn Stover-Derived Sulfonated Carbon as a Reusable Solid Acid Catalyst for the Green Multicomponent Synthesis of Tetrahydrodipyrazolopyridines

Pareenat Waenthongkham, Chatthai Kaewtong, Supinya Nijpanich, Nopbhasinthu Patdhanagul et autres

Abstract The open-field burning of agricultural residues such as corn stover contributes significantly to air pollution and greenhouse gas emissions, highlighting the need for sustainable waste-valorization strategies. In this study, corn stover was converted into a sulfonated carbon catalyst through KOH activation, …

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Corn stalk-derived magnetic humic acid nanocatalyst for green synthesis of tetrahydrodipyrazolopyridines in water

Kittiwan Sresuksai, Supinya Nijpanich, Andrew Hunt, Pakin Noppawan

ABSTRACT A sustainable magnetic nanocatalyst (Fe 3 O 4 /HA) was prepared by coating humic acid (HA) derived from corn stalk agricultural waste onto Fe 3 O 4 nanoparticles via a hydrothermal-co-precipitation method. The catalyst combines the Brønsted acidity of biomass-derived humic …

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Efficient Removal of Antibiotics from Aqueous Solutions through a Zn (II)–Norfloxacin Complex Formation on Porous Carbon from Sugar Cane Leaf Waste

Tanaporn Supakitmongkhol, Suwiwat Sangon, Pakin Noppawan, Yuvarat Ngernyen et autres

High Resolution Image Download MS PowerPoint Slide Sustainable porous carbon adsorbents were developed from waste sugar cane leaves and tops (SC), while adsorption testing revealed that they are highly effective for the removal of antibiotics (norfloxacin and amoxicillin) from aqueous systems. Chemical …

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Sustainable One-Pot Synthesis of Dihydropyrimidinones Using a Bio-Waste-Derived Magnetic Sulfonated SBA-16/NiAl-LDO Catalyst

Pakin Noppawan, Kanyarat Saenthornsin, Sonchai Intachai, Kanyaphat Torboon et autres

High Resolution Image Download MS PowerPoint Slide This study presents the development of a novel magnetic heterogeneous catalyst derived from waste sugarcane bagasse ash for the efficient one-pot synthesis of dihydropyrimidinones via the Biginelli reaction. The catalyst combines mesoporous SBA-16 silica with …

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Recycled carbon fibers from wind-turbine blade waste combined with carbon nanotubes for sensitive electrochemical detection of carbendazim

Jaroon Jakmunee, Pakin Noppawan, Nontipa Supanchaiyamat, Andrew J. Hunt et autres

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Valorization of White Shrimp Shell Waste: Development of Chitosan-Based Pellet Feed for Enhanced Nile Tilapia (Oreochromis niloticus) Nutrition

Kanokkan Worawut, Baramee Phungpis, Pakin Noppawan

This study demonstrates the development and application of an eco-friendly Nile tilapia (Oreochromis niloticus) feed formulation incorporating chitosan extracted from white shrimp shells. The extraction process yielded purified chitosan through ultrasonic deproteinization, acid demineralization, and alkaline deacetylation, confirmed by FTIR spectrophotometry. Three …

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Efficient and green Biginelli reactions in palm oil using a ZnCl2-impregnated sulfonated carbon catalyst derived from corn cob waste

Phiraphon Setsuwan, Pareenat Waenthongkham, Kanyaphat Torboon, Yuvarat Ngernyen et autres

This study presents a novel, sustainable catalytic system for the Biginelli reaction, utilizing a sulfonated carbon catalyst synthesized from underutilized corn cob waste via ZnCl 2 activation and dual step sulfonation. The resulting catalyst, 2S2Zn-500, exhibited high surface area (739 m 2 …

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Quercitrin and Quercetin From Piliostigma malabaricum and Cheniella lakhonensis : Ultrasound‐Assisted Extraction, HPLC and LC‐MS Analysis, and Bioactivity Evaluation

Wannachai Chatan, Pakin Noppawan, Jantima Upan, Wanwisa Lijuan et autres

This study investigated the phytochemical composition, antioxidant capacity, and anti‐inflammatory potential of ethanolic leaf extracts of Piliostigma malabaricum and Cheniella lakhonensis . Preliminary phytochemical screening showed that both species contained phenolic compounds, flavonoids, tannins, saponins, and cardiac glycosides, indicating diverse secondary metabolites. …

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Sustainable corncob-derived sulfonated carbon catalysts for recyclable biginelli reactions in palm oil

Pakin Noppawan, Pareenat Waenthongkham, Kanyaphat Torboon, Yuvarat Ngernyen et autres

This study presents a significant advancement in sustainable catalysis through the development of a sulfonated carbon catalyst derived from agricultural corncob waste for the green synthesis of dihydropyrimidinones (DHPMs) via the Biginelli reaction. Employing a simple, metal-free activation and sulfonation method, the …

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Preparation and Characterization of Thermo-Compressed Guar Gum/Microcrystalline Cellulose Composites for Applications in Sustainable Packaging

Prasong Srihanam, Jenjira Jirum, Pakin Noppawan, Nuanchai Khotsaeng et autres

In this study, we prepared guar gum (GG) films using a compression molding technique for the first time, incorporating glycerol as a plasticizer and microcrystalline cellulose (MCC) as a reinforcing filler. The chemical structures, thermal properties, crystalline structures, phase morphology, mechanical properties, …

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