Supramolecular Chemistry Research Unit (SCRU)

Molecular Modeling and Computational Chemistry Research Group (MMCCRG)

Chemically modified silica and polymer bead: Designing novel chelating molecules using supramolecular chemistry concept, Synthesizing the chelating molecules for preconcentration of heavy metals, Modifying silica surface utilizing novel chelating molecules, Applying to solid-phase extraction and preconcentration, Validating the proposed method.

Synthesis Calix[4]arene for heavy metals extraction: Synthesis of calix[4]arene for extract heavy metals using supramolecular chemistry and coordination chemistry concept, Extraction study of the novel synthesized calix[4]arene towards heavy metals by liquid-liquid extraction and determination by flame atomic absorption spectrometry.

Speciation analysis: Using difference selective adsorbent for each ion species, Back extraction by compatible eluent, to over come both preconcentration and speciation in one step to promote an accuracy and robust method.

Gold nanoparticle preparation: Using the chemically modified silica having a reduce group convert chloroaurate solution to gold nanoparticle on the silica support.

Optode ion sensor: Synthesis of a new chromofluoroionophore base Nile Blue structure and covalently bond with polymer backbone. Fabricate with optode ingredient for preparing plasticizer free microsphere Na+ selective optode.

Ion Selective Electrode (ISE): Development a new approach ISE by a new concept, Backside calibration, by adjust the inner reference solution or by using current to adjust the ISE membrane polarization.

• Honor award of Senior Project in 11th Academic Congress Faculty of Science Chulalongkorn University.
• Honor award of poster presentation in 17th Science Congress of DPST Undergraduate Student at Silpakorn University.
• Development and Promotion of Science and Technology Talent Project Scholarship (DPST).

Current Research Programs:

• Chemically bonded silica and polymer bead;
• Preconcentration and solid-phase extraction of trace heavy metal;
• Speciation analysis;
• Fluorescence Optode for ion sensor;
• New approach of Ion Selective Electrode technique;

Selected Publications:

1. Ngeontae, W.; Aeungmaitrepirom, W.; Tuntulani, T. "Chemically modified silica gel with aminothioamidoanthraquinone for solid phase extraction and preconcentration of Pb(II), Cu(II), Ni(II), Co(II) and Cd(II)" Talanta 2007, 71, 1075-1082.
2. Ngeontae, W.; Aeungmaitrepirom, W.; Tuntulani, T. “Synthesis of dithia diaza calix[4]arene derivative and its extraction properties towards Zn2+, Ni2+, Cu2+ and Cr3+” J. Sci. Res. Chula. Univ. 2006, 31, pp-pp.
3. Morakot, N.; Tomapatanaget, B.; Ngeon-tae, W.; Aeungmaitripirom, W.; Tuntulani, T. "Synthesis and Fluorescence Sensing Properties of Calix[4]arenes Containing Fluorophores" Supramol. Chem. 2005, 17, 655-659.