Nano-grade ZnO loaded magnetic biological carbon composite photocatalyst and preparation method thereof

A nano-scale, bio-carbon technology, applied in the field of adsorption materials, can solve the problem of difficult separation and recovery of photocatalysts, and achieve the effect of strong absorption capacity

Active Publication Date: 2018-07-24
湖南大辰环保股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problem that the photocatalyst is difficult to separate and recover in the photocatalytic treatment of chromium-containing wastewater, the present invention proposes a magnetic bio-carbon composite photocatalyst loaded with nano-scale ZnO and its preparation method, so that nano-ZnO can be used as a photocatalyst for chromium-containing After the decontamination treatment of wastewater, it is convenient to use an external magnetic field to achieve effective separation and recovery from the suspension after the adsorption reaction

Method used

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  • Nano-grade ZnO loaded magnetic biological carbon composite photocatalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] like figure 1 As shown, a preparation method of magnetic bio-carbon composite photocatalyst loaded with nano-scale ZnO, 500g coconut shells are washed and dried, then broken to a width of 3-4cm and put into 2L of clear water, and flake KOH is added until the water The pH value is between 11-12, and then placed in a small autoclave to maintain a temperature of 200 o Around C, the pressure is 10 6 pa thermal hydrolysis reaction for 30min, stop heating and naturally cool to room temperature, remove the coconut shell and dry in the sun. Put the washed, dried and crushed coconut shells into clean water and then add KOH to a high pH value. The strong alkalinity of KOH is used to activate and hydrolyze the coconut shells at the same time, so that the coconut shells are hydrolyzed in a strong alkali high temperature environment.

[0033] The dried coconut shells were placed in a muffle furnace, and nitrogen gas was continuously fed into it at 20 o The heating rate of C / min ...

Embodiment 2

[0038] The basic principle of Example 2 is the same as that of Example 1. Take 300g of sawdust or bamboo chips and put them into 2.5L of clear water after washing and drying. Add KOH until the pH value of the water is 11, and then place it in a small high-pressure reactor to maintain the temperature. for 190 o C, the pressure is 8*10 5 Pa hydrolysis reaction for 25min, stop heating and cool to room temperature naturally, remove sawdust or bamboo chips and dry in the sun.

[0039] Place the dried wood chips or bamboo chips in a muffle furnace, and continuously feed nitrogen to 15 o The heating rate of C / min raises the temperature to 180 o Stop heating after C, keep the temperature for 25 minutes, then stop heating, cool naturally to room temperature to obtain pre-carbonized coconut shells, smash the pre-carbonized coconut shells through a 10-mesh sieve.

[0040] Respectively get 0.1mol / L ferrous sulfate heptahydrate solution 80ml, 0.25mol / L potassium hydroxide solution 80ml,...

Embodiment 3

[0044] The basic principle of this example is the same as that of Example 1. Take 400g of cotton stalks or straws, wash and dry them, cut them to 2-3cm, put them into 3L of clean water, add KOH until the pH of the water is 11.5, and then place them in a small high-pressure Keep the temperature in the reactor at 180 o C, the pressure is 9*10 5 Pa hydrolysis reaction for 20min, stop heating and cool to room temperature naturally, remove cotton stalks or straws and dry in the sun.

[0045] Place the dried cotton stalks or straws in a muffle furnace, and continuously feed nitrogen to 22 o The heating rate of C / min raises the temperature to 190 o Stop heating after C, keep the temperature for 20 minutes, stop heating, cool naturally to room temperature to obtain pre-carbonized coconut shells, smash the pre-carbonized coconut shells through a 15-mesh sieve.

[0046] Take 120ml of 0.1mol / L ferrous chloride solution, 90ml of 0.25mol / L potassium hydroxide solution, and 120ml of 0.1m...

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Abstract

The invention provides a nano-grade ZnO loaded magnetic biological carbon composite photocatalyst and a preparation method thereof. The preparation method comprises the following steps: step 1: carrying out thermal hydrolysis on a biomass under an alkaline condition to extract plant fibers; after drying, carrying out pre-carbonization treatment; mashing and sieving with a sieve with the size of 10to 20 meshes; step 2: mixing a ferrous salt solution and a potassium hydroxide solution; adding soluble zinc salt; step 3: adding the sieved plant fibers into the solution formed by step 2; uniformlymixing and adding a potassium nitrate solution; after sufficiently stirring, treating a mixture in a water bath; continuously stirring and ageing until black gel is formed, so as to obtain a black gel solution; step 4: after washing and drying the black gel solution, generating dry gel; calcining the dry gel and continuously introducing inert gas; after washing and drying, obtaining the nano-grade ZnO loaded magnetic biological carbon composite photocatalyst. According to the nano-grade ZnO loaded magnetic biological carbon composite photocatalyst, magnetic biological carbon is used as a carrier of the photocatalyst, and the problem that the photocatalyst in chromium-containing sewage treatment is difficult to separate and recycle is solved.

Description

technical field [0001] The invention relates to a photocatalyst and a preparation method thereof, in particular to a magnetic bio-carbon composite photocatalyst loaded with nano-scale ZnO and a preparation method thereof, belonging to the technical field of adsorption materials. Background technique [0002] At present, heavy metal pollution has become one of the more serious water pollution problems. Chromium pollution exists in air, water, food, and soil. The country discharges about 600,000 tons of chromium slag every year, accumulating about 6 million tons over the years, and less than 17% have been detoxified or comprehensively utilized. A large number of studies have shown that Cr(VI) The toxicity is about 100 times higher than that of Cr(III). Because chromium is highly toxic and cannot be decomposed by microorganisms, water-soluble hexavalent chromium has been listed as one of the eight most harmful chemical substances to the human body. It is one of the three inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J35/10C02F1/30C02F1/32C02F1/70C02F1/48C02F101/22
CPCB01J23/80B01J35/0033B01J35/004B01J35/1028C02F1/30C02F1/32C02F1/488C02F1/70C02F2101/22C02F2305/10
Inventor 李显涛唐宁远周杉
Owner 湖南大辰环保股份有限公司
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