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Heavy medium material for enhancing coagulation-adsorption synergistic effect and preparation method thereof

A synergistic, dense medium technology, applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., can solve the problems of difficult to effectively remove dissolved organic pollutants, large footprint, long residence time, etc. Achieve the effects of simple and feasible preparation method, low production cost and strong stability

Pending Publication Date: 2022-08-05
华能陇东能源有限责任公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the problems of high chemical consumption, long residence time and large floor area of ​​conventional coagulation and sedimentation technology, and the difficulty of effectively removing dissolved organic pollutants by existing dense medium enhanced coagulation technology

Method used

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  • Heavy medium material for enhancing coagulation-adsorption synergistic effect and preparation method thereof

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preparation example Construction

[0032] the Fe 3 O 4 The preparation of @rGO composites adopts a simple solvothermal method, which includes the following steps:

[0033] Step S21, measuring and quantifying the prepared graphene oxide suspension with a concentration of 1.0 g / L, and ultrasonically treating it for 3 hours to make it uniformly dispersed;

[0034] Step S22, weigh quantitative iron salt (FeCl 3 , ferric sulfate or ferric nitrate) and dissolve with a small amount of water, join in the graphene oxide suspension that dispersion is completed, stir 6 hours, form the first solution that iron salt concentration is 2.0~8.0g / L;

[0035] Step S23, transfer the first solution to the three-necked flask, add a small amount of hydrazine hydrate (as a reducing agent), continue stirring, and heat to 90-100 ° C; wherein, the consumption ratio of iron salt to hydrazine hydrate is 2-3g: 0.06-0.1mL.

[0036] Step S24, adding a quantitative ammonium carbonate solution to the three-necked flask, maintaining at 90-10...

Embodiment 1

[0043] S1: Weigh 2g graphite powder and add it to 27mL of H 3 PO 4 (mass concentration is 85%), carry out mechanical stirring to form the first solution;

[0044] S2, slowly adding 240 mL of concentrated sulfuric acid to the first solution, and continuing to stir to form a second solution;

[0045] S3, 12g KMnO 4Slowly added to the second solution, heated to 50°C, maintained for 12 hours and then cooled to room temperature to form a third solution;

[0046] S4, transfer the third solution to an ice-water bath, and add 2 mL mass fraction of 30% H 2 O 2 Add it slowly, observe that its color changes from brown to bright yellow, and synthesize graphene oxide solution containing impurities.

[0047] S5, the synthesized graphene oxide is repeatedly centrifuged and washed with hydrochloric acid having a concentration of 20%, and the finally obtained brown viscous substance is freeze-dried to obtain graphene oxide.

[0048] S6, weigh 2 g of the prepared graphene oxide into a sim...

Embodiment 2

[0056] S1, measure 37mL of the graphene oxide suspension in Example 1 with a prepared concentration of 1.0g / L, and ultrasonically treat it for 3 hours to make it evenly dispersed to obtain a graphene oxide suspension;

[0057] S2, weigh 0.25g FeCl 3 And dissolved with a small amount of water, added to the dispersed graphene oxide suspension, stirred for 6 hours to form FeCl 3 The first solution with a concentration of 5.0 g / L;

[0058] S3, transfer the first solution to a three-necked flask, add 2 drops (0.04 mL) of hydrazine hydrate, continue stirring, and heat to 100° C.;

[0059] S4, add a quantitative ammonium carbonate solution to the three-necked flask, maintain at 100° C. for 3 hours, and after cooling to room temperature, repeat centrifugal washing with distilled water and ethanol respectively;

[0060] S5, after drying the washed material in a vacuum drying oven at 80°C for 12 hours, and then annealing at 500°C for 3 hours under nitrogen protection, a heavy medium m...

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Abstract

The invention discloses a dense medium material for enhancing coagulation-adsorption synergistic effect and a preparation method thereof, and the preparation method comprises the following steps: 1) adding a ferric salt solution into a graphene oxide suspension, and uniformly stirring to form a first solution; and 2) adding hydrazine hydrate into the first solution, uniformly stirring, heating to 90-100 DEG C, adding an ammonium carbonate solution, keeping the temperature for 2-4 hours, centrifuging, washing, drying and annealing to obtain the dense medium material for strengthening the coagulation-adsorption synergistic effect. The magnetic heavy medium can be used as a magnetic heavy medium core and an adsorbent at the same time, and has a heavy medium enhanced coagulation effect on suspended pollutants in water and an adsorption effect on soluble organic matters, and the application efficiency of a coagulating sedimentation technology in water treatment is further improved through the cooperation of the two. The preparation method is simple, feasible, low in production cost and high in yield, and the prepared material is high in stability and reusable and has the potential of being widely applied to industrial production.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a heavy medium material for strengthening the synergistic effect of coagulation and adsorption and a preparation method thereof. Background technique [0002] As a conventional process in water treatment, coagulation and sedimentation technology makes colloidal and suspended pollutants agglomerate into large flocs by adding chemicals such as coagulants and flocculants to sewage, which are then removed by precipitation. Dense medium enhanced coagulation technology forms high-density, compact flocs with seeds as the core by adding recyclable heavy medium seeds. Compared with conventional coagulation and sedimentation technology, it has lower chemical consumption and residence time Short, small footprint advantage. However, the heavy medium enhanced coagulation technology also has the bottleneck problem that it is difficult to effectively remove dissolved organic pollutan...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/52B01J20/20B01J20/28B01J20/30C02F101/30
CPCC02F1/281C02F1/283C02F1/5236B01J20/06B01J20/20B01J20/28009B01J20/28057B01J20/3078C02F2101/30
Inventor 吴有兵郗天浩李甲伟康少鑫邢文斌叶治安颜博刘德庆刘科学霍敏艳刘贵栋
Owner 华能陇东能源有限责任公司
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