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Device for removing heavy metal in sludge in situ through electric coupling of graphene hydrogel

A graphene hydrogel, heavy metal technology, applied in graphene, electrochemical sludge treatment, water/sludge/sewage treatment and other directions, to achieve the effect of improving electrical conductivity, improving adsorption effect, and reducing workload

Pending Publication Date: 2022-06-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve many problems existing in the treatment of existing electrodynamic restoration technology and to provide a device for electrodynamically coupling graphene hydrogel to remove sludge heavy metals in situ

Method used

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  • Device for removing heavy metal in sludge in situ through electric coupling of graphene hydrogel

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specific Embodiment approach

[0024] The technical solutions of the present invention are not limited to the specific embodiments listed below, but also include any combination of specific embodiments.

specific Embodiment approach 1

[0025] Embodiment 1: The process of removing the heavy metal in the sludge in the device for in-situ removal of heavy metals from sludge by electrokinetic coupling graphene hydrogel is carried out according to the following steps:

[0026] Step 1. Preparation of graphene oxide solution: prepare an ice-water bath, and in the water bath, pass the graphite powder of 200 mesh sieves and the mixed solution of concentrated sulfuric acid and concentrated phosphoric acid, wherein the volume ratio of sulfuric acid and phosphoric acid is 9:1, mixed. The liquid-solid mass ratio of the resulting solution and the graphite powder is 110:1, and the temperature is guaranteed to be below 10 °C, and the ice bath is stirred at a speed of 1000rmp / min-2000rmp / min for 30min; Add potassium permanganate to the mixed liquid, the mass ratio of potassium permanganate solid and graphite powder is 3:1, try to ensure that potassium permanganate solid and liquid mixture are fused, and keep the system tempera...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the potential gradient described in step 5 is 1V / cm. Others are the same as the first embodiment.

[0033] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the potential gradient described in step 5 is 1.5V / cm. Others are the same as the first embodiment.

[0034] Actual implementation 1 and data:

[0035] (1) Sludge pretreatment: 400ml of factory sludge after removal of large particles, add 5% of dilute nitric acid by mass, and stir with a stirring paddle for 0.5h at a speed of 150rmp / min for pretreatment. The moisture content after treatment is 34 %, the initial pH was 6.

[0036] (2) Fix the graphene oxide hydrogel fixing device in the electrolytic cell, put the pretreated sludge in (1) into the sludge chamber, and add 400 ml of sodium nitrate with a mass fraction of 3% into the electrolytic chamber and press evenly.

[0037] (3) Power on: power on for 5h un...

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Abstract

The invention discloses a device for removing heavy metal in sludge in situ by electrically coupling graphene hydrogel. The device for removing heavy metal in sludge in situ by electrically coupling graphene hydrogel comprises a graphene hydrogel fixing device, an electrolytic tank, a sludge tank, a cathode electrolytic tank and an anode electrolytic tank, wherein the cathode electrolytic tank and the anode electrolytic tank are positioned at two ends of the device. The process of removing the heavy metals in the sludge by the device comprises the following steps: step 1, preparing graphene oxide; step 2, preparing graphene hydrogel; step 3, pretreating the sludge to obtain a sludge sample of which the water content is 30-50% and the pH value is less than 7; 4, fixing a graphene hydrogel fixing device and preparing an electrolytic cell; and step 5, electrifying for 5 hours under the condition that the potential gradient is 0.5-1.5 V / cm. The method has the beneficial effects of shortening the treatment time, increasing the conductivity efficiency, reducing the energy consumption and improving the effect of removing the heavy metals in the sludge.

Description

technical field [0001] The invention relates to a device for in-situ removal of heavy metals in sludge by electrokinetic coupling of graphene hydrogel and a process for in-situ removal of heavy metals in sludge by using the device, in particular to a graphene and a graphene hydrogel Extreme preparation method. Background technique [0002] In recent years, with the growth of population, the improvement of living standards and the advancement of industrialization, the discharge of urban industrial wastewater and domestic sewage has increased substantially, and the discharge of sludge has also increased. At present, a large number of scholars at home and abroad are devoted to the treatment and disposal of urban and industrial wastewater. Compared with the research on sewage, the research on sludge is relatively less. For the problem of heavy metal pollution in both industrial sludge and domestic sewage sludge, due to the treatment and disposal of sludge, there are many types ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C01B32/184C01B32/194B01J13/00C02F101/20
CPCC02F11/006C02F11/00C01B32/184C01B32/194B01J13/0056B01J13/0065C02F2101/20Y02W10/10
Inventor 王怡刘淼吴鹦骏
Owner JILIN UNIV
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