Manganese dioxide modified biochar composite material as well as a preparation method and an application thereof

Abstract

The invention discloses a manganese dioxide modified biochar composite material as well as a preparation method and an application thereof. The composite material is prepared from manganese dioxide and biochar by loading generated manganese dioxide on biochar through the neutralization reaction of permanganate and manganese in divalent manganese salt. The manganese dioxide modified composite material has the advantages of high adsorption capacity for heavy metal lead or cadmium, obvious adsorption effect, low preparation cost and the like, and is an ideal heavy metal wastewater adsorbent; thepreparation method of the composite material has the advantages of simple process, cheap raw materials, sufficiently used raw materials, low production cost and the like. The manganese dioxide modified composite material can be used for treating heavy metal wastewater, and has the advantages of high adsorption capacity for heavy metals, high adsorption efficiency, low toxicity to organisms in theenvironment and the like, and can be produced and applied on a large scale.

Description

technical field

[0001] The invention belongs to the field of materials and environment, and in particular relates to a biochar composite material modified by manganese dioxide and its preparation method and application. Background technique

[0002] With the rapid development of modern industry and agriculture, heavy metals enter the water body through industrial pollution sources such as mining, metal processing and chemical production wastewater, the use of pesticides and fertilizers and domestic garbage and other sources of pollution, as well as natural sources such as geological erosion and weathering, which are harmful to public health. pose a serious threat to the ecological environment. What's more serious is that heavy metal pollution has the characteristics of concealment, long-term, irreversible and serious consequences. It can eventually enter the human body through the ecological food chain, causing physiological diseases and endangering human health.

[0003] A...

Examples

Embodiment 1

[0055] A biochar composite material modified by manganese dioxide of the present invention comprises manganese dioxide and biochar; the biochar composite material modified by manganese dioxide is obtained through the normalization of manganese elements in potassium permanganate and manganese acetate tetrahydrate The reaction is prepared by loading the generated manganese dioxide on biochar.

[0056] A preparation method of the manganese dioxide modified biochar composite material of the above-mentioned present embodiment, comprising the following steps:

[0057] S1. Mix pig manure and camphor wood chips in a mass ratio of 4:1, and perform aerobic composting for 60 days to obtain the mixture, and wash the mixture several times with deionized water, dry it at 80°C, grind it, and pass it through a 100-mesh sieve , and store in a sealed bag for later use.

[0058] S2. Put the mixture passed through a 100-mesh sieve in step S1 into a quartz boat, then put the quartz boat in a tube...

Embodiment 2

[0070] An application of the manganese dioxide-modified biochar composite material of the present invention in the treatment of heavy metal wastewater, wherein the manganese dioxide-modified biochar composite material is derived from Example 1, and the heavy metal wastewater is lead-containing heavy metal wastewater or cadmium-containing heavy metal wastewater .

[0071] Process lead-containing heavy metal wastewater, comprising the following steps: take by weighing 13 parts of manganese dioxide-modified biochar composite materials in Example 1 in an Erlenmeyer flask, adding an ionic strength of 0.01mol / L , Lead-containing heavy metal wastewater with a pH value of 5.0±0.2, wherein the initial concentrations of lead in the lead-containing heavy metal wastewater are 0.5mg / L, 1.0mg / L, 5.0mg / L, 10.0mg / L, 20.0mg / L, 40.0 mg / L, 60.0mg / L, 80.0mg / L, 100.0mg / L, 120.0mg / L, 150.0mg / L, 180.0mg / L and 210.0mg / L. After mixing, the adsorption reaction was shaken for 12 hours under the conditi...

Embodiment 3

[0083] An application of the manganese dioxide-modified biochar composite material of the present invention in the treatment of heavy metal wastewater, the manganese dioxide-modified biochar composite material is derived from Example 1, and the heavy metal wastewater is lead-containing heavy metal wastewater or cadmium-containing heavy metal wastewater .

[0084] The treatment of lead-containing heavy metal wastewater includes the following steps: weighing 39 parts of the manganese dioxide-modified biochar composite material in Example 1 in an amount of 0.40 g / L in 39 Erlenmeyer flasks, and dividing them into three groups. Add lead-containing heavy metal wastewater with an ionic strength of 0.01mol / L and a pH value of 5.0±0.2 into each group of Erlenmeyer flasks. The initial concentrations of lead in the lead-containing heavy metal wastewater are 0.5mg / L, 1.0mg / L, and 5.0mg respectively. / L, 10.0mg / L, 20.0mg / L, 40.0mg / L, 60.0mg / L, 80.0mg / L, 100.0mg / L, 120.0mg / L, 150.0mg / L, 180...

technical field

[0001] The invention belongs to the field of materials and environment, and in particular relates to a biochar composite material modified by manganese dioxide and its preparation method and application. Background technique

[0002] With the rapid development of modern industry and agriculture, heavy metals enter the water body through industrial pollution sources such as mining, metal processing and chemical production wastewater, the use of pesticides and fertilizers and domestic garbage and other sources of pollution, as well as natural sources such as geological erosion and weathering, which are harmful to public health. pose a serious threat to the ecological environment. What's more serious is that heavy metal pollution has the characteristics of concealment, long-term, irreversible and serious consequences. It can eventually enter the human body through the ecological food chain, causing physiological diseases and endangering human health.

[0003] A...

Examples

Embodiment 1

[0055] A biochar composite material modified by manganese dioxide of the present invention comprises manganese dioxide and biochar; the biochar composite material modified by manganese dioxide is obtained through the normalization of manganese elements in potassium permanganate and manganese acetate tetrahydrate The reaction is prepared by loading the generated manganese dioxide on biochar.

[0056] A preparation method of the manganese dioxide modified biochar composite material of the above-mentioned present embodiment, comprising the following steps:

[0057] S1. Mix pig manure and camphor wood chips in a mass ratio of 4:1, and perform aerobic composting for 60 days to obtain the mixture, and wash the mixture several times with deionized water, dry it at 80°C, grind it, and pass it through a 100-mesh sieve , and store in a sealed bag for later use.

[0058] S2. Put the mixture passed through a 100-mesh sieve in step S1 into a quartz boat, then put the quartz boat in a tube...

Embodiment 2

[0070] An application of the manganese dioxide-modified biochar composite material of the present invention in the treatment of heavy metal wastewater, wherein the manganese dioxide-modified biochar composite material is derived from Example 1, and the heavy metal wastewater is lead-containing heavy metal wastewater or cadmium-containing heavy metal wastewater .

[0071] Process lead-containing heavy metal wastewater, comprising the following steps: take by weighing 13 parts of manganese dioxide-modified biochar composite materials in Example 1 in an Erlenmeyer flask, adding an ionic strength of 0.01mol / L , Lead-containing heavy metal wastewater with a pH value of 5.0±0.2, wherein the initial concentrations of lead in the lead-containing heavy metal wastewater are 0.5mg / L, 1.0mg / L, 5.0mg / L, 10.0mg / L, 20.0mg / L, 40.0 mg / L, 60.0mg / L, 80.0mg / L, 100.0mg / L, 120.0mg / L, 150.0mg / L, 180.0mg / L and 210.0mg / L. After mixing, the adsorption reaction was shaken for 12 hours under the conditi...

Embodiment 3

[0083] An application of the manganese dioxide-modified biochar composite material of the present invention in the treatment of heavy metal wastewater, the manganese dioxide-modified biochar composite material is derived from Example 1, and the heavy metal wastewater is lead-containing heavy metal wastewater or cadmium-containing heavy metal wastewater .

[0084] The treatment of lead-containing heavy metal wastewater includes the following steps: weighing 39 parts of the manganese dioxide-modified biochar composite material in Example 1 in an amount of 0.40 g / L in 39 Erlenmeyer flasks, and dividing them into three groups. Add lead-containing heavy metal wastewater with an ionic strength of 0.01mol / L and a pH value of 5.0±0.2 into each group of Erlenmeyer flasks. The initial concentrations of lead in the lead-containing heavy metal wastewater are 0.5mg / L, 1.0mg / L, and 5.0mg respectively. / L, 10.0mg / L, 20.0mg / L, 40.0mg / L, 60.0mg / L, 80.0mg / L, 100.0mg / L, 120.0mg / L, 150.0mg / L, 180...

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