Preprocessing method for removing nanoscale iron-bearing substance Kelvin balance disturbance

A nano-scale, pretreatment technology, applied in the preparation of test samples, etc., can solve the problems of inaccurate determination of organic matter content in wastewater, inability to remove dissolved iron colloids, and interference in measurement results.

A nano-scale, pretreatment technology, applied in the preparation of test samples, etc., can solve the problems of inaccurate determination of organic matter content in wastewater, inability to remove dissolved iron colloids, and interference in measurement results.

CN103063503BInactive Publication Date: 2015-04-08WUHAN UNIV OF TECH
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  • Preprocessing method for removing nanoscale iron-bearing substance Kelvin balance disturbance
  • Preprocessing method for removing nanoscale iron-bearing substance Kelvin balance disturbance
  • Preprocessing method for removing nanoscale iron-bearing substance Kelvin balance disturbance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] When the methyl orange content was determined after the methyl orange-containing wastewater was treated by adsorption of iron-containing oxides, analytically pure aluminum sulfate was added to eliminate the kevin equilibrium interference test of nano-scale iron-containing substances.

[0021] 1. Draw a methyl orange standard curve

[0022] 1.1 Weigh 0.02g of methyl orange powder with an analytical balance, dissolve it, and make 1L of 20mg / l methyl orange solution in a volumetric flask, and use the gradient dilution method to configure 0, 0.8, 1.6, 2.4, 4, 4.8, 8mg / l l standard solution.

[0023] 1.2 Use 1.6mg / l methyl orange solution to scan on the UV-3100PC ultraviolet-visible spectrophotometer, and the best absorption wavelength is 476.2nm.

[0024] 1.3 Measure the absorbance of the solution prepared in 1.1 at a wavelength of 476.2nm, and draw a standard curve. The results are shown in Table 1 and figure 1 .

[0025] Table 1

[0026] Methyl orange standard curve d...

Embodiment 2

[0073] In the absence of aluminum sulfate, add Fe 2 o 3 The test results of adsorbing methyl orange, pentachlorophenol or phenol are respectively Table 9, figure 2 ; Table 10, image 3 ; Table 11, Figure 4 .

[0074] Table 9 with Fe 2 o 3 Adsorption of methyl orange, without adding aluminum sulfate flocculation to eliminate interference

[0075]

[0076] Table 10 with Fe 2 o 3 Adsorption of pentachlorophenol without adding aluminum sulfate flocculation to eliminate interference

[0077]

[0078]

[0079] Table 11 with Fe 2 o 3 Adsorption of phenol without adding aluminum sulfate flocculation to eliminate interference

[0080]

Embodiment 3

[0082] Add aluminum sulfate to adjust the pH to 7-7.5, flocculate and precipitate to eliminate interference, add Fe 2 o 3 The test results of adsorbing methyl orange, pentachlorophenol or phenol are respectively in Table 12, Figure 5 ; Table 13, Figure 6 ; Table 14, Figure 7 .

[0083] Table 12 with Fe 2 o 3 Adsorb methyl orange, add aluminum sulfate to adjust pH to 7-7.5, flocculate and precipitate to eliminate interference

[0084]

[0085] Table 13 Fe 2 o 3 Adsorb pentachlorophenol, add aluminum sulfate to adjust pH to 7-7.5, flocculate and precipitate to eliminate interference

[0086]

[0087] Table 14 with Fe 2 o 3 Adsorb phenol, add aluminum sulfate to adjust pH to 7-7.5, flocculate and precipitate to eliminate interference

[0088]

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Abstract

Provided is a preprocessing method for removing nanoscale iron-bearing substance Kelvin balance disturbance. When adsorbent or catalyst with a nanoscale iron-bearing substance adopted carries out measurement on organic content after carrying out adsorbing or catalyzing, due to the fact that iron-bearing colloid of Kelvin equilibrium dissolution enables to-be-measured liquid to present red color, absorption is produced, and measurement on organics by ultraviolet spectrophotometry, gas phrase or liquid phrase color spectrum is disturbed. After a pH value of the to-be-measured liquid is measured, iron-bearing salt is adopted to neutralize electric charge carried by the iron-bearing colloid, a high speed centrifuge of 4000 rpm / min is adopted, after liquid-solid separation is finished, the pH value is modulated back, the solution is sent to be measured, disturbance of the iron-bearing colloid on the measurement is removed, and aluminum saltalum floc does not produce adsorption on the organics and also not change original adsorption of the iron-bearing colloid. The preprocessing method for removing the nanoscale iron-bearing substance Kelvin balance disturbance is easy and convenient to achieve, low in cost, small in error and convenient to operate, and the situations that the measurement on the organics by ultraviolet the spectrophotometry, the gas phrase or the liquid phrase color spectrum is disturbed by the iron-bearing adsorbent or the catalyst Kelvin balance are avoided.

Description

technical field [0001] The invention relates to a pretreatment method for eliminating kevin equilibrium interference of nanoscale iron-containing substances during content determination after adsorption or catalysis of organic substances. Background technique [0002] Nanoscale iron-containing substances (including iron oxides and iron hydroxides) are mostly semiconductors, which have excellent quantum effects, low price, good environmental compatibility, and large adsorption capacity. The band gap is 2.0~2.3eV. It has photocatalytic activity under the action of sunlight, and is widely used as an adsorption material or photocatalytic material, such as: 1. Patent No. CN200910071515, title of invention: method for treating organic wastewater with ferrite as an adsorbent. 2. Patent No.: CN201010237605.4 Invention Name: A preparation method of bismuth ferrite photocatalyst. [0003] During the adsorption and catalysis of organic matter by nano-iron-containing substances, due to...

Claims

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Application Information

Patent Timeline
08 Apr 2015
Publication
CN103063503B
IPC
G01N1/34
Inventors
方继敏; 方鉥