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A straw-based selective mercury removal material and its preparation method and application

A selective, straw-based technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of long processing time, high processing cost, and unsatisfactory adsorption effect, and achieve Enhanced selectivity and removal capacity, increased specific surface area, and low-cost preparation

Inactive Publication Date: 2018-08-31
SICHUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the common mercury-containing wastewater treatment methods mainly include chemical precipitation method, electrolysis method, membrane filtration method, ion exchange method, metal reduction method, microbial method, etc., but these methods have high treatment cost and long treatment time, some methods may cause secondary secondary pollution risk
Different types of adsorption materials such as activated carbon, bentonite, clay, chitin, etc. have also been used for mercury-containing wastewater treatment, but these materials have broad-spectrum adsorption and poor selectivity, especially in the absence of modification, the adsorption effect is not good. ideal
[0004] Patent CN201110320777.2 discloses a method for removing mercury-containing industrial wastewater by using mushroom culture medium waste. Its disadvantages are: long contact time, slow settling speed, and difficult separation; CN201310632485.1 discloses a method for removing mercury by waste liquid adsorption Agent and its preparation method and use method, its shortcoming is: the precursor material contains metals such as manganese, zinc, aluminum, titanium, they enter waste water after ion exchange and may produce secondary pollution
[0006] Although some progress has been made in the preparation of mercury removal materials using straw as raw materials, the mercury removal ability of the obtained materials is not strong, which is mainly reflected in: (1) the inability to treat wastewater with high mercury concentration; 2) It takes a long time to process; (3) It is difficult to treat mercury-containing waste liquid in a wide pH range; (4) The removal rate of mercury is low

Method used

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  • A straw-based selective mercury removal material and its preparation method and application
  • A straw-based selective mercury removal material and its preparation method and application
  • A straw-based selective mercury removal material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. The straw with a length of 3-5 cm is subjected to steam explosion treatment at 1.5 MPa and 210° C., and then cracked in vacuum and nitrogen at 600° C. to obtain an adsorption carrier for future use.

[0035] 2. Immerse the adsorption carrier in 1 into a mixed solution of reducing sulfur-containing groups (thioglycolic acid 0.5 mol / L, ammonium thiocyanate 1.0 mol / L, ammonium thiosulfate 2.0 mol / L), at 50°C Under stirring for 1h, filtered and dried at room temperature. The dried impregnated material is mixed according to the ratio of carbon-sulfur mass ratio (C / S) 1:1, heated to 450°C under vacuum and nitrogen, and maintained for 2 hours, and the temperature is programmed to 600°C, and vacuum and nitrogen are maintained. 2h. Cool to room temperature and grind to obtain a sulfur load of 4.6wt% and a specific surface area of ​​398m 2 / g of selective mercury removal material.

[0036] 3. Add the selective mercury removal material in 2 into the mercury-containing wastew...

Embodiment 2

[0038] 1. The straw with a length of 3-5 cm is subjected to steam explosion treatment at 1.5 MPa and 210° C., and then cracked in vacuum and nitrogen at 700° C. to obtain an adsorption carrier for future use.

[0039] 2. Immerse the adsorption carrier in 1 into the mixed solution of reducing sulfur-containing groups (ammonium thiocyanate 3.0mol / L, mercaptoacetic acid 0.8mol / L, ammonium thiosulfate 2.0mol / L), at 50°C Under stirring for 1h, filtered and dried at room temperature. The dried impregnated material is mixed according to the ratio of carbon-sulfur mass ratio (C / S) 1:2, heated to 450°C under the condition of vacuum and nitrogen, and maintained for 2h, and the temperature is programmed to 800°C, and kept under vacuum and nitrogen 2h. Cool to room temperature and grind to obtain a sulfur load of 5.1wt% and a specific surface area of ​​435m 2 / g of selective mercury removal material.

[0040] 3. Add the selective mercury removal material in 2 into the mercury-containin...

Embodiment 3

[0042] 1. The straw with a length of 3-5 cm is subjected to steam explosion treatment at 1.5 MPa and 210° C., and then cracked in vacuum and nitrogen at 700° C. to obtain an adsorption carrier for future use.

[0043]2. Immerse the adsorption carrier in 1 into the mixed solution of reducing sulfur-containing groups (ammonium thiocyanate 0.5mol / L, thioglycolic acid 0.8mol / L, ammonium thiosulfate 1.0mol / L), Under stirring for 1h, filtered and dried at room temperature. The dried impregnated material is mixed according to the ratio of carbon-sulfur mass ratio (C / S) 1:1, heated to 450°C under vacuum and nitrogen gas, and maintained for 2 hours, and the temperature is programmed to 700°C, and vacuum and nitrogen gas are maintained. 2h. Cool to room temperature and grind to obtain a sulfur load of 4.68wt% and a specific surface area of ​​412m 2 / g of selective mercury removal material.

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Abstract

The present invention provides a straw-based selective mercury removal material preparation method, which comprises: (1) carrying out a steam explosion treatment on straws, and then treating at a temperature of 400-800 DEG C under vacuumizing and nitrogen atmosphere; (2) placing the product obtained in the step (1) into a reductive sulfur group-containing mixing liquid, carrying out stirring mixing, filtering, and drying, wherein the reductive sulfur group-containing mixing liquid is a mixing liquid of ammonium thiocyanate, ammonium thiosulfate and thioglycolic acid; and (3) mixing the product obtained in the step (2) and sublimed sulfur, heating under vacuumizing and nitrogen introducing conditions to achieve a temperature of 450 DEG C, maintaining for 2 h, carrying out program heating to 600-1000 DEG C, maintaining the vacuumizing and nitrogen introducing for 2 h, cooling, and grinding so as to obtain the straw-based selective mercury removal material. The invention further provides the mercury removal material prepared through the method and applications of the mercury removal material in mercury removal. According to the present invention, the straw-based selective mercury removal material has advantages of high mercury adsorption capacity, high mercury removal rate, rapid mercury removal, high selectivity, cheap and easily available raw materials, simple and feasible preparation process, environmental protection, economy, and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a preparation method of a straw-based selective mercury removal material. Background technique [0002] Mercury is a heavy metal pollutant with severe physiological and neurotoxicity to the human body. It can accumulate and amplify through the food chain in the ecosystem, posing a threat to human and ecosystem health. The United Nations Environment Program (UNEP) has formally incorporated mercury into environmental diplomacy, and adopted a legally binding Minamata Mercury Convention in 2013, which will monitor and limit the production and trade of mercury-containing products globally, while Control and reduce mercury emissions. There are more than 80 mercury-related industries in the world, and more than 3,000 mercury-related products. Every year, about 1,000 tons of mercury is discharged into the environment globally through wastewater. A large amount o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/20
CPCB01J20/02B01J20/20C02F1/283C02F2101/20
Inventor 何磊陈卓尔廖颖冯元超张继娟
Owner SICHUAN NORMAL UNIV