Chitosan/graphite phase carbon nitride/titanium dioxide nanofiber membrane as well as preparation method and application thereof

A graphite-phase carbon nitride and nanofiber membrane technology, applied in chemical instruments and methods, water/sludge/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problems of easy aggregation of materials, waste of materials and energy , affecting adsorption and photocatalytic performance, etc., to achieve the effect of simple process, easy operation and low cost

Active Publication Date: 2020-06-09
QINGDAO UNIV
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite photocatalyst can expose both photocatalysts, which is conducive to the utilization of photogenerated electron holes and prolongs the life of the catalyst. However, the preparation of the composite material requires the purchase or preparation of PS spherical templates, and high-temperature calcination in the later stage. Remove the PS template, resulting in waste of materials and energy, and at the same time, the g-C 3 N 4 Coated on TiO 2 On the @PS ball, g-C needs to be controlled during the preparation process 3 N 4 The thickness of the cladding layer to ensure that both semiconductor materials are exposed and in contact with the dielectric
[0005] In actual use, chitosan adsorbent and g-C 3 N 4 / TiO 2 Photocatalysts face two problems: while ensuring a high specific surface area, on the one hand, materials tend to aggregate, which affects their adsorption and photocatalytic properties
However, the synergistic removal of Cr(VI) by adsorption and photocatalysis of chitosan / graphite-phase carbon nitride / titanium dioxide (CS / CNT) nanofibers has not been reported yet.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Chitosan/graphite phase carbon nitride/titanium dioxide nanofiber membrane as well as preparation method and application thereof
  • Chitosan/graphite phase carbon nitride/titanium dioxide nanofiber membrane as well as preparation method and application thereof
  • Chitosan/graphite phase carbon nitride/titanium dioxide nanofiber membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) 0.50g chitosan and 0.04g polyethylene oxide were dissolved in 25g acetic acid solution (80%, w / w), stirred at room temperature for 12h to obtain spinning solution A;

[0036] (2) Slowly disperse 0.05g of the CNT composite material into the spinning solution A described in step (1), and stir at room temperature for 6h to obtain the spinning solution B;

[0037] (3) After the spinning solution B described in step (2) is ultrasonicated for 1h, it is injected into the syringe, and under a high pressure of 15kV, the distance between the spinning nozzle and the collector is adjusted to 15cm, and the extrusion rate of the syringe is adjusted to 15cm. to 5ml / h, the CS / CNT nanofiber membrane is finally obtained.

[0038] In this embodiment, the mass ratio of chitosan and CNT composite material is 10:1, and the CS / CNT nanofiber membrane is denoted as CS / CNT 10:1 nanofibrous membranes, made of figure 2 It can be seen that CS / CNT 10:1 The nanofibers 1 in the nanofiber membr...

Embodiment 2

[0040] (1) 0.5g chitosan and 0.04g polyethylene oxide were dissolved in 25g acetic acid solution (80%, w / w), stirred at room temperature for 12h to obtain spinning solution A;

[0041] (2) Add 0.1g g-C 3 N 4 / TiO 2 The composite material is slowly dispersed into the spinning solution A described in step (1), and stirred at room temperature for 6 hours to obtain the spinning solution B;

[0042] (3) After supersonicating the solution B described in step (2) for 1h, inject it into the syringe, under the high pressure of 15kV, adjust the distance between the spinning nozzle and the collector to 15cm, and adjust the extrusion rate of the syringe to 5ml / h, the CS / CNT nanofiber membrane is finally obtained.

[0043] In this embodiment, the mass ratio of chitosan and CNT composite material is 5:1, and the CS / CNT nanofiber membrane is denoted as CS / CNT 5:1 Nanofibrous Membrane, CS / CNT 10:1 The average diameter of nanofibers is 85nm. In the adsorption experiment, the adsorption a...

Embodiment 3

[0045] (1) 3.0g chitosan and 0.2g polyethylene oxide were dissolved in 40g acetic acid solution (80%, w / w), stirred at room temperature for 8h to obtain spinning solution A;

[0046] (2) Slowly disperse 0.05g of the CNT composite material into the spinning solution A described in step (1), and stir at room temperature for 6h to obtain the spinning solution B;

[0047] (3) after the spinning solution B described in step (2) is ultrasonically 1h, inject in the syringe, under the high pressure of 20kV, the distance between the spinning nozzle and the collector is adjusted to 20cm, and the extrusion rate of the syringe is adjusted. to 8ml / h, the CS / CNT nanofiber membrane is finally obtained.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Tensile strengthaaaaaaaaaa
The average diameteraaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a chitosan / graphite-phase carbon nitride / titanium dioxide nanofiber membrane as well as a preparation method and an application thereof. The preparation method of the nanofiber membrane comprises the following steps: dissolving chitosan and a blended polymer in an acetic acid solution, and magnetically stirring at room temperature for a certain time to obtain a spinning solution A; slowly dispersing a g-C3N4 / TiO2 composite material into a spinning solution A, and magnetically stirring at room temperature for a certain time to obtain a spinning solution B; and carryingout ultrasonic treatment on the spinning solution B, and carrying out electrostatic spinning to finally obtain the chitosan / graphite-phase carbon nitride / titanium dioxide nanofiber membrane. The nanofiber membrane has a high specific surface area and high tensile strength, and Cr (VI) and other organic pollutants can be efficiently removed through the synergistic effect of adsorption and photocatalysis.

Description

technical field [0001] The invention relates to the field of removing organic pollutants such as hexavalent chromium, in particular to a chitosan / graphite phase carbon nitride / titanium dioxide nanofiber membrane and a preparation method and application thereof. Background technique [0002] Hexavalent chromium (Cr(VI)) is a highly toxic heavy metal, which widely exists in chemical industry and other industries, including leather tanning, mining, electroplating metal polishing and so on. Wastewater containing Cr(VI) is discharged into the environment, which not only seriously pollutes the ecological environment, but also causes persistent and serious harm to the health of humans and other organisms. Therefore, how to efficiently remove Cr(VI) in wastewater has become an urgent problem to be solved. [0003] At present, there are many methods to remove Cr(VI) in water, such as chemical precipitation, reverse osmosis, ion exchange, adsorption, etc. Among these methods, the ads...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J20/24B01J20/30B01J20/28C02F1/28C02F101/22
CPCB01J20/24B01J20/20B01J20/0259B01J20/06B01J20/28038B01J20/28007C02F1/281C02F1/283C02F1/286C02F2101/22Y02W10/37
Inventor崔育倩龙云泽王晓雄李庆浩董敏
OwnerQINGDAO UNIV