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Method for removing hydrogen sulfide through photochemical catalysis

A hydrogen sulfide and photocatalytic technology, applied in the field of desulfurization, can solve the problems of high investment and operating costs, low photon efficiency, restricting practical application, etc., and achieve the effect of large area, large specific surface area and uniform load.

Active Publication Date: 2014-04-16
石家庄科林奥德环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydrogen sulfide as a serious odor gas has attracted more and more attention. At present, various traditional hydrogen sulfide removal technologies are widely used, but they all have some shortcomings such as large area, high investment and operating costs, and high energy consumption. Photocatalysis The technology has the advantages of mild reaction conditions, wide source of catalysts, low price, non-toxicity, stable chemical properties, large energy gap, no light corrosion, acid and alkali resistance, no selectivity to target degradation products, and no secondary pollution. It has been widely concerned by researchers from various countries, but it generally has low utilization rate of light and low photon quantum efficiency, which restricts TiO 2 In the practical application of photocatalysis, in recent years, many researchers have tried to improve photocatalytic activity through ion doping, sensitization, semiconductor recombination and other technologies.
[0003] Photocatalytic treatment of gaseous pollutants has been researched and applied, but most of them are mainly used to degrade indoor VOCs, including benzene, toluene, formaldehyde, etc., and the technology is becoming more and more mature, and the purification effect is good. The treatment of hydrogen sulfide is mostly used in liquid media However, there are few reports on the research and application of gas-solid phase photolysis purification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Activate the activated carbon fibers in ultrasonic waves and dry them at 105°C;

[0019] 2. Preparation of modified photocatalyst ACF / Fe / Ce / TiO by sol-gel method 2 , the ion doping amount is n(Fe / Ti)=0.6-0.7%, wrapped with tin foil and calcined in a muffle furnace, the temperature is controlled at 450-550°C, and the calcining time is 3 hours;

[0020] 3. Connect the hydrogen sulfide-containing gas to a photocatalytic reactor consisting of a single photocatalytic reaction unit. A 15-30w ultraviolet lamp is placed in the center of the photocatalytic reaction unit, and a quartz tube is placed outside the quartz tube. An 8mm-thick modified photocatalyst ACF / Fe / Ce / TiO 2 Material. Ventilate after turning on the 15-30w ultraviolet light source.

[0021] 4. Control the initial concentration of hydrogen sulfide gas to less than 100mg / m 3 , the residence time is 3s, the desulfurization efficiency reaches over 85%, and the elemental sulfur output is 4500mg / (m 3 Modified ...

Embodiment 2

[0023] 1. Activate the activated carbon fibers in ultrasonic waves and dry them at 105°C;

[0024] 2. Preparation of modified photocatalyst ACF / Fe / Ce / TiO by sol-gel method 2 , the ion doping amount is n(Fe / Ti)=0.4~0.5%, wrapped with tin foil and calcined in a muffle furnace, the temperature is controlled at 450~500°C, and the calcining time is 4 hours;

[0025] 3. Connect the gas containing hydrogen sulfide to the photocatalytic reactor composed of two photocatalytic reaction units connected in parallel. A 15-30w ultraviolet lamp is placed in the center of each photocatalytic reaction unit, and a quartz tube is covered, and a 5mm-thick modified photocatalyst ACF with a doping amount of n(Fe / Ti)=0.4-0.5% is placed on the outer 4mm of the quartz tube. / Fe / Ce / TiO 2 Materials, ventilate after turning on the 15-30w ultraviolet light source.

[0026] 4. Control the initial concentration of hydrogen sulfide gas to 100-200mg / m 3 , the residence time is 1.5s, the desulfurization ef...

Embodiment 3

[0028] 1. Activate the activated carbon fibers in ultrasonic waves and dry them at 105°C;

[0029] 2. Preparation of modified photocatalyst ACF / Fe / Ce / TiO by sol-gel method 2 , the ion doping amount is n(Fe / Ti)=0.1-0.4%, wrapped in tin foil and calcined in a muffle furnace, the temperature is controlled at 450-500°C for 4 hours;

[0030] 3. Connect the gas containing hydrogen sulfide to the photocatalytic reactor consisting of a single photocatalytic reaction unit. A 15-30w ultraviolet lamp is placed in the center of the photocatalytic reaction unit, and a quartz tube is placed outside the quartz tube. A 6mm-thick modified photocatalyst ACF / Fe with a doping amount of n(Fe / Ti)=0.1-0.4% is placed on the outside of the quartz tube. / Ce / TiO 2 Materials, ventilate after turning on the 15-30w ultraviolet light source.

[0031] 4. Control the initial concentration of hydrogen sulfide gas to 100-200mg / m 3 , the residence time is 2s, the desulfurization efficiency is over 79%, and t...

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Abstract

The invention belongs to the technical field of desulfuration, and particularly relates to a method for removing hydrogen sulfide through photochemical catalysis, Fe / Ce ions which are produced by a sol-gel method are co-doped, the doping ratio is as follows: n(Fe / Ti) equals to 0.1-0.8%, because of the efficient catalytic properties of an anatase type modified load photocatalyst activated carbon fiber (ACF) / Fe / Ce / TiO2 at the calcination temperature of 400-550 DEG C, the hydrogen sulfide gas with low concentration is absorbed and photolyzed in a photochemical catalytic reactor under an ultraviolet lamp of 15-30w, the retention period, illumination intensity and photocatalyst filling amount are controlled, the hydrogen sulfide is absorbed, photolyzed, and enabled to reach the standard to be emitted, and a product of elemental sulfur is obtained from the surface of the modified load photocatalyst ACF / Fe / Ce / TiO2. The method can realize the waste gas treatment and reutilization of malodorous hydrogen sulfide gas with low concentration, and has the characteristics of cheap raw materials, no toxicity and secondary pollution, low energy consumption and the like.

Description

technical field [0001] The invention belongs to the technical field of desulfurization and relates to a method for photocatalytically removing hydrogen sulfide. The method is aimed at hydrogen sulfide waste gas discharged from some paper mills, coking plants, chemical plants, pharmaceutical plants, sewage treatment plants, landfills and the like. Background technique [0002] Hydrogen sulfide as a serious odor gas has attracted more and more attention. At present, various traditional hydrogen sulfide removal technologies are widely used, but they all have some shortcomings such as large area, high investment and operating costs, and high energy consumption. Photocatalysis The technology has the advantages of mild reaction conditions, wide source of catalysts, low price, non-toxicity, stable chemical properties, large energy gap, no light corrosion, acid and alkali resistance, no selectivity to target degradation products, and no secondary pollution. It has been widely concer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/52
Inventor 任爱玲赵文霞郭斌孙俊艳
Owner 石家庄科林奥德环保科技有限公司
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