Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for determining waster water COD by simulating sunlight photoelectrocatalysis

A photoelectric catalysis and sunlight technology, which is applied in the fields of electrochemical variables of materials, measurement devices, and material analysis by electromagnetic means, to achieve the effects of rapid measurement, simple preparation, and large free space.

Inactive Publication Date: 2014-05-21
TONGJI UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this has not been reported in previous studies

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
  • Method for determining waster water COD by simulating sunlight photoelectrocatalysis
  • Method for determining waster water COD by simulating sunlight photoelectrocatalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An electrode for measuring wastewater COD by simulating sunlight photoelectric catalysis, the electrode is based on a titanium plate, and an upright and orderly TiO is constructed by anodization 2 -NTs, in TiO 2 -There is a urea solution with a mass fraction of 5% in the pores of NTs, and the titanium plate is carbonized at a high temperature to obtain C-N / TiO 2 -NTs.

[0022] The preparation method of an electrode for measuring wastewater COD by simulating sunlight photoelectric catalysis comprises the following steps:

[0023] (1) Upright ordered TiO on Ti-based surface 2 -Growth and reduction of NTs

[0024] Construction of upright and ordered TiO on the surface of titanium plate by anodic oxidation method 2 -NTs, then 1mol L -1 NH 4 The Cl solution is the electrolyte, the temperature is controlled at 25°C, and the TiO 2 -NTs restore 3s;

[0025] (2) C-N / TiO 2 - Preparation of NTs electrode

[0026] Loading of urea solution into TiO by vacuum load impregnat...

Embodiment 2

[0032] The practicability of this method was investigated with actual water samples obtained from food factories, urban domestic sewage, river water and hospital sewage. In order to minimize the influence of the matrix (such as pH value), the experiment adopts the standard addition method to simulate the solar photocatalytic oxidation to detect the COD value of the actual sample. The procedure is as follows: (a) use C-N / TiO2-NTs electrode in 90ml 0.1mol L -1 Na 2 SO 4 Measured in electrolyte solution i blank ; (b) at 0.1M Na 2 SO 4 Add 10ml of the actual sample solution to the electrolyte solution, mix well and measure i total , and calculate i net , if i net If it exceeds the linear range, first use 0.1M Na 2 SO 4 The electrolyte solution is diluted to within the detection range; (c) 500 μl of a mixed organic solution with a theoretical COD value of 2000 ppm is added to the diluted actual sample solution after the (b) step, and a COD value increased by 10 ppm is mea...

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

No PUM Login to View More

Abstract

The invention relates to a method for determining waster water COD by simulating sunlight photoelectrocatalysis, which adopts a C-N / TiO2-NTs electrode as a photoelectrode and rapidly determines a waster water COD value by simulating photoelectrocatalysis under a sunlight irradiation condition. Compared with the prior art, the method of the invention adopts a vacuum load immersion method, which not only maintains good tubular channels of TiO2-NTs, facilitates full contact of TiO2-NTs with organic matter, but also allows the spectral response range of TiO2-NTs to have a red shift to a visible light region by C and N doping, allows the electrode to rapidly determine waste water COD under a sunlight irradiation-simulating condition, and avoids the problem that ultraviolet xenon lamps and commercial voltage stabilizers have to be carried in traditional photocatalysis; the COD detection range for waste water containing potassium biphthalate and glucose is 0.4-440 mg / L, and the detection limit is 0.1 mg / L.

Description

technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to a method capable of simulating sunlight, photoelectric catalysis, and rapid determination of COD in wastewater. Background technique [0002] Chemical oxygen demand (COD), as an indicator to measure the relative content of organic matter in water, is one of the most important indicators of water pollution index, and it is of great significance to the treatment of sewage and the quality evaluation of water. At present, the COD determination method mainly has the potassium dichromate oxidation method (COD Cr ), potassium permanganate index method (COD Mn ), coulometric and spectrophotometric methods. These methods have long analysis time and cumbersome operation process; higher requirements for the operator’s experimental skills increase the probability of errors; the reaction process consumes a large amount of concentrated sulfuric acid, expensive sil...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416G01N27/30
Inventor 赵国华陈康余志敏刘梅川
Owner TONGJI UNIV