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Nano-tio2 semipermeable membrane water sample pretreatment method modified by surfactant

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

Inactive Publication Date: 2016-06-01
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

At present, the built-in enrichment substances reported in the literature are all organic solvents. The main disadvantages of this kind of semi-permeable membrane devices with built-in substances as solvents are single types, poor selectivity, and good effect on hydrophobic trace pollutants in water bodies. The enrichment ability, but the ability for moderate or weak hydrophobic compounds is relatively poor, which greatly limits the application of semi-permeable membrane sampling devices in the pretreatment of environmental water samples

Method used

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  • Nano-tio2 semipermeable membrane water sample pretreatment method modified by surfactant

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Experimental program
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Embodiment 1

[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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Abstract

The invention discloses a surfactant modified nano TiO2 semi-permeable membrane water sample pretreatment method which comprises the following steps: nano TiO2 particles modified by the surfactant are embedded into a semi-permeable membrane dialysis bag, sealed and put into water, stirring is performed until adsorption equilibrium is reached, and organic pollutants in water enter the semi-permeable membrane dialysis bag in a passive diffusion and transmembrane manner so as to isolate natural organic matters outside the semi-permeable membrane dialysis bag. The method can be used for pretreatment of an environment water sample containing high content of organic matters.

Description

technical field [0001] The invention belongs to the field of chemical analysis testing instruments and equipment, in particular to a pretreatment method for a semipermeable membrane water sample, and in particular to a surfactant-modified nano-TiO 2 Semipermeable membrane water sample pretreatment method. Background technique [0002] Accurate and rapid analysis and determination of trace organic pollutants in environmental water has always been a difficult point in environmental analytical chemistry. Because the composition of environmental water samples is extremely complex and the content of pollutants is usually extremely low, the pretreatment of environmental water samples is very important. It has become an indispensable link in a complete analysis method. Semi-permeable membrane (SPMD, semi-permeablemembranedevice) sampling technology simulates the distribution and equilibrium process of organic compounds from the water phase to the bio-organic phase through the biof...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/14B82Y30/00
Inventor 赵晓丽吴丰昌汪浩
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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