Method for preparing attapulgite clay catalyst and method for measuring COD by the catalyst

A technology for attapulgite clay and catalyst, which is applied in the field of preparation of attapulgite clay catalyst, can solve problems such as unseen measurement of COD, and achieve the effects of improving development and utilization value, simple preparation method, and shortening measurement time.

Inactive Publication Date: 2009-09-16
HUAIYIN TEACHERS COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there has been no report on the use of attapulgite as a catalyst for the determination of COD so far.

Method used

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  • Method for preparing attapulgite clay catalyst and method for measuring COD by the catalyst
  • Method for preparing attapulgite clay catalyst and method for measuring COD by the catalyst
  • Method for preparing attapulgite clay catalyst and method for measuring COD by the catalyst

Examples

Experimental program
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Effect test

example 1

[0023] Example 1: the preparation of attapulgite catalyst:

[0024] (1) Purification of attapulgite: Take 100 meshes of original attapulgite and add it into water according to the mass ratio of 1:10 and stir for 24 hours to obtain attapulgite slurry, let it stand naturally, take the upper suspension, filter, dry, and grind to obtain purified attapulgite;

[0025] (2) Acidification treatment: add the purified attapulgite into the mixed acid solution according to the mass ratio of 1:10, boil for 70 minutes under constant stirring, filter and wash until neutral, dry and grind to obtain the acidified attapulgite, that is, the attapulgite catalyst; Wherein, the mixed acid solution with a concentration of 5% by volume is composed of sulfuric acid and phosphoric acid.

[0026] The XRD pattern of the acidified attapulgite obtained by example 1 is as follows figure 2 As shown, the XRD of the original attapulgite is as follows figure 1 shown by figure 1 , 2 It can be seen that the ...

example 2

[0027] Example 2: the preparation of attapulgite catalyst:

[0028] (1) Purification of attapulgite: Take 150 meshes of original attapulgite and add it into water according to the mass ratio of 1:13 and stir for 36 hours to obtain attapulgite slurry, let it stand naturally, take the upper suspension, filter, dry, and grind to obtain purified attapulgite;

[0029] (2) Acidification treatment, add purified attapulgite into the mixed acid solution according to the mass ratio of 1:13, boil for 80 minutes under constant stirring, filter and wash to neutral after boiling, dry and grind to obtain acidified attapulgite, that is, attapulgite catalyst ; Among them, the mixed acid solution with a concentration of 5% by volume is 5% mixed with sulfuric acid and phosphoric acid.

[0030] The IR figure of the acidified attapulgite obtained by example 2 is as follows Figure 4 As shown, the IR of the original attapulgite is as image 3 shown, from image 3 , 4 It can be seen that the cha...

example 3

[0031] Example 3: the preparation of attapulgite catalyst:

[0032] (1) Purification of attapulgite: take 200 mesh of original attapulgite and add it into water according to the mass ratio of 1:15 and stir for 48 hours to obtain attapulgite slurry, let it stand naturally, take the upper suspension, filter, dry, and grind to obtain purified attapulgite;

[0033] (2) Acidification treatment, add purified attapulgite into the mixed acid solution at a mass ratio of 1:15, boil for 90 minutes under constant stirring, filter and wash until neutral, dry and grind to obtain acidified attapulgite, that is, attapulgite catalyst ; Among them, the mixed acid solution with a concentration of 5% by volume is 5% mixed with sulfuric acid and phosphoric acid.

[0034] The SEM figure of the acidified attapulgite obtained by example 3 is as follows Figure 6 As shown, the SEM of the original attapulgite is as Figure 5 shown, from Figure 5 , 6 It can be seen that the crystal shape of the unt...

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Abstract

The invention discloses a method for preparing an attapulgite clay catalyst and a method for measuring COD by the catalyst. The method for preparing the attapulgite clay catalyst comprises the following steps: (1) attapulgite purification, namely adding the primary attapulgite into water according to a mass ratio of 1:10-15, stirring the mixture for 24 to 48 hours to form attapulgite slurry, keeping the attapulgite slurry standing naturally, taking suspension on the upper layer, and filtering, drying and grinding the suspension to obtain purified attapulgite; and (2) acidification treatment, namely adding the purified attapulgite into mixed acid solution according to a mass ratio of 1:10-15, slightly boiling the mixture for 70 to 90 minutes by continually stirring, filtering the boiled mixture, washing the filter cake to be neutral, and drying and grinding the filter cake to obtain acidified attapulgite, namely the attapulgite catalyst, wherein the mixed acid solution of which volume concentration is 5 percent is formed by mixing sulphuric acid and phosphoric acid. The steps in the COD measuring method are the same as GB11914-1989; when domestic sewage is measured, 20 milliliters of concentrated sulphuric acid and 0.3 gram of attapulgite are added into the domestic sewage and reflowed for 30 minutes; and when industrial sewage is measured, 30 milliliters of concentrated sulphuric acid and 0.3 gram of acidified attapulgite are added into the industrial sewage and reflowed for 30 minutes. By adopting the primary attapulgite to prepare the catalyst, the development and utilization values of the primary attapulgite are promoted; and by adopting the acidified attapulgite to measure COD, the measuring cost is lowered, the measuring time is shortened, and the secondary pollution is reduced.

Description

technical field [0001] The invention relates to a preparation method and a use method of a catalyst, in particular to a preparation method of an attapulgite clay catalyst and a method for measuring COD of the catalyst. Background technique [0002] Chemical Oxygen Demand (COD Cr ) refers to the amount of oxidant consumed when potassium dichromate is used as an oxidant to treat sewage samples under strong acid and heating conditions. COD Cr The size of the value reflects the degree of water pollution by reducing substances, and is one of the important indicators to measure the relative content of organic matter in water. In the determination of GB11914-1989 chemical oxygen demand (COD Cr ), silver sulfate is used as the catalyst, and 28.00 mL of sulfuric acid solution containing 1% silver sulfate should be added to every 20.00 mL of water sample in routine determination, and heated to boiling and refluxed for 2 hours. COD measured by this method Cr The value range is 30-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/16G01N31/10G01N33/18
Inventor 尹起范史昆波朱玉兰盛振环夏敏
Owner HUAIYIN TEACHERS COLLEGE
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