Surfactant modified nano TiO2 semi-permeable membrane water sample pretreatment method
A surfactant and semi-permeable membrane technology is applied in the field of water sample pretreatment of surfactant-modified nano-TiO2 semi-permeable membrane, which can solve the problems of limiting the application of semi-permeable membrane sampling device, poor hydrophobic compound ability, poor selectivity, etc. , to achieve the effect of fast speed, short adsorption path and fast balance speed
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[0042] 1. Nano-TiO 2 Preparation of granules:
[0043] With CTAB as template, Ti(SO 4 ) 2 As a precursor, mix and stir for 30min, age at room temperature for 12h, transfer to an autoclave, and perform hydrothermal treatment at 100°C for 72h to obtain TiO 2 powder and cooled to room temperature. Finally, after centrifugation, washing with water and ethanol, and drying overnight at 120°C, in order to enhance the crystal form of the particles, the obtained solid was calcined at the corresponding temperature for 6 hours with a heating rate of 2°C / min.
[0044] 2. Surfactant adsorption self-assembly modification:
[0045] Take 0.5g nanometer TiO 2 Particles, add 100mL deionized water, adjust the pH value of the solution to 8.0, add 300mg cationic surfactant CTAB, ultrasonic 5min, after standing for 20min, the cationic surfactant forms hydrophobic micelles on the particle surface by self-assembly method ( figure 1 shown in steps ① and ②).
[0046] 3. Transfer to a semi-permea...
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