| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 105 === Tap water quality and the efficiency of water treatment plants are closely related. Tap water plants mostly see chlorine, hypochlorite and other chlorine species as disinfectant. However, the disinfectant such as humus will lead to byproduct (Haloacetic acid (HAAs) and trihalomethanes (THMs)) when it reacts with organic substances in water. It is both carcinogenic and mutagenic. Humic substances can cause the proliferation of heterogeneous microorganisms within water distribution network. Humic acid is also one of a major component of humus.
In this study, we discussed the adsorption reaction of mesoporous melamine formaldehyde resin (MMF) compared to melamine formaldehyde resin (MF) with humic acid in water pollutants under several different circumstances. Temperature, time, concentration, pH and NaCl ionic strength are included. The characteristics of MMFs were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), specific surface area analyzer (BET), and Zeta potential. The surface morphology, pore structure, pore volume, characteristics of the functional groups and the electrostatic voltage on the colloidal particles were observed.
The result indicates that the pore size distribution of MMF is uniformed. MMF pore size is about 100 nm, MF pore size of about 109 μm. With the increasing of the temperature. The adsorption of MMF is higher than that of MF, and it is two times better than that of powdered activated carbon (PAC). The maximum theoretical adsorption capacity of MMF was estimated to be 295 mg g-1 by the Langmuir isothermal adsorption model. MMF is suitable in acidic. It comes out with high removal and adsorption ability. The higher the salt concentration (NaCl) is the better the adsorption ability of MMF shows. However, the adsorption ability is less than that of MF. As well as the recyclability, five times of recycle experiments indicates that the use of dilute sulfuric acid in order to regenerate MF and MMF turns out successfully. Its adsorption ability maintains at 70 %, which shows that recycling is quite feasible.
|
|---|
