Synthesis of Adsorbent Materials by Sol-Gel Method for the Adsorption of Formaldehyde

Name: Srisuda Sae-ung

keyword: Mesoporous materials

Abstract: Organic-inorganic hybrid mesoporous materials were tailored through the cocondensation reaction of tetraethoxysilane (TEOS) and three types of organoalkoxysilanes: 3aminopropyl- trimethoxysilane (APTMS). n-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAP) and 3-[2-(2-aminoethylamino) ethylamino] propyl-trimethoxysilane (AEEA) in the first part of experiment. Pores of hybrid materials were generated by adding pore-forming agent, cetyltrimethylammonium bromide (CTAB), to the mixture during synthesis step. Template was subsequently removed from silica matrix by using HCllEtOH extraction method. The effect of type of organoalkoxysilane precursor and H20/precursors ratio on the characteristics and adsorptive capacities of the derived materials were investigated. The samples were characterized by using the following techniques: surface area and pore size analyzer, Transmission Electron Microscope (TEM), Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) Spectroscopy, and 29Si CPIMAS NuClear Magnetic Resonance (NMR) Spectroscopy. The solid-state NMR and FTIR demonstrated the incorporation of amine functional groups on pore wall of the amine-functionalized materials. In addition, FTIR spectra indicated that the amine sites on pore surface reacted with formaldehyde molecule during adsorption and showed that surfactant template can be removed from silica matrix by using extraction method. Furthermore, the adsorption data of formaldehyde was fitted to Langmuir, Freundlich and Temkin isotherm. The adsorption results of the first experiment indicated that hybrid mesoporous materials functionalized with AEAP and using H20/precursors ratio of 80 exhibited the highest adsorptive capa<;ity among all samples. AEAP was subsequently selected for synthesize the adsorbents in the later experiment by using the same method. The amount of amine precursor was varied in a range of 0-50 mol% to study the effect of amount of amine precursor on the characteristics of adsorbents. BET surface area results showed the effect of AEAP loading. The excess AEAP added in the initial mixture at high amount of AEAP inhibit the co-condensation between ifEOS and AEAP, resulting in the homo-condensation of TEOS. The adsorbents with low surface area and amine active sites on pore surface were obtained. Sample derived from 85 mol% ofTEOS and 15 mol% of AEAP showed the highest adsorptive capacity.

King Mongkut's University of Technology Thonburi. KMUTT Library.

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Virote Boonamnuayvitaya

Role: Advisor

Created: 2007

Modified: 2557-05-25

Issued: 2553-01-01

วิทยานิพนธ์/Thesis

application/pdf

JGSEE130

tha

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Environmental Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	JGSEE130.pdf	2.25 MB	44	2024-11-08 14:35:16
2	JGSEE130ab.pdf	32.71 KB	15	2019-06-20 11:04:40

ใช้เวลา

0.027352 วินาที