Method for preparing nano black carbon passivator for repairing heavy metal contaminated soil

A technology for polluted soil and heavy metals, which is applied in the restoration of polluted soil, chemical instruments and methods, and other chemical processes. It can solve the problem of high production cost of modified wastewater passivator, damage to microporous structure, and influence on popularization and application. and other issues, to achieve the effect of wide application range, friendly production environment and simple process principle

Active Publication Date: 2013-05-08
SHANDONG NORMAL UNIV
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Problems solved by technology

At present, strong acidic oxidants are commonly used to modify the surface of nano-black carbon. The modification of strong oxidants will destroy the microporous structure, increase the transitional pore system, and significantly reduce the adsorption performance.
In addition, high-concentration strong acid oxidation modification of nano-black carbon also faces problems such as secondary treatment of modified wastewater and high production costs of passivators, which will affect the popularization and application of this technology

Method used

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  • Method for preparing nano black carbon passivator for repairing heavy metal contaminated soil
  • Method for preparing nano black carbon passivator for repairing heavy metal contaminated soil
  • Method for preparing nano black carbon passivator for repairing heavy metal contaminated soil

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: the screening of oxidizing agent

[0027] This embodiment first selects five kinds of oxidizing agents (see Table 1 for the concentration of the oxidizing agent) composed of concentrated nitric acid, sulfuric acid, potassium permanganate, sulfuric acid+potassium permanganate and nitric acid+potassium permanganate as a comparison, and then weigh 5 Groups of nanometer black carbon, each group of 20g in 250ml Erlenmeyer flasks, add 200ml of oxidant to each bottle, put them in a fume hood for 24 hours, and then carry out the oxidation reaction. Follow the process steps below to prepare five kinds of Modified nano black carbon passivator under oxidant oxidation conditions; then weigh several parts of 0.1g modified nano black carbon respectively, place them in centrifuge tubes respectively, add 20ml of Cu(NO 3 ) 2 Solutions, the concentrations of which are 30mg / L, 50mg / L, 70mg / L, 100mg / L, 130mg / L, 160mg / L, 200mg / L, were shaken at 25°C for 2 hours, and placed in...

Embodiment 2

[0031] Embodiment 2: nitric acid+potassium permanganate oxidant oxidation process parameter

[0032] (1) Determination of oxidant concentration

[0033] 20%HNO 3 Respectively with 0.05~0.20mol / L KMnO 4 Solution is made a series of nitric acid-potassium permanganate mixed oxidant; The following is operated by technological process steps, respectively prepares the modified nano-black carbon passivator under different concentration nitric acid-potassium permanganate mixed oxidant oxidation conditions; By table 2 It can be seen that when the concentration of potassium permanganate is 0.10mol / L, the Cu 2+ The maximum adsorption capacity;

[0034] Table 2 Effect of potassium permanganate concentration on the adsorption capacity of modified nano black carbon for heavy metals

[0035] Potassium permanganate concentration / (mol / L)

Adsorption amount of Cu (mg / g)

0.05

13.51

0.10

15.85

0.20

15.13

[0036] (2) Determination of oxidatio...

Embodiment 3

[0048] Embodiment 3: Modified nano black carbon passivator morphology structure and surface characteristics

[0049] (1) Oxygen-containing functional groups on the surface increase after oxidation modification

[0050] figure 1 It is the infrared spectrogram of nano black carbon passivator before and after modification (CB and OCB), the peak position before modification (CB) is at 1619cm -1 and 3450cm -1 , respectively C=C stretching vibration and O-H stretching vibration; In addition to the increase in the area of ​​these two peaks in the infrared spectrum after modification (OCB), a new 1244.0cm -1 , 1721.6cm -1 , 447.3cm -1 The equal peaks are the stretching vibration of C-O, the stretching vibration of C=O and the bending vibration of CNO group respectively; it shows that after CB is oxidized and modified, in addition to the increase of C=C and O-H functional groups on the surface of OCB compared with CB, there are also new C-O, C=O and CNO functional groups are remov...

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Abstract

The invention belongs to the technical field of preparation of novel materials and relates to a method for preparing a nano black carbon passivator for repairing heavy metal contaminated soil. The method comprises the following steps of: weighing nano black carbon raw materials and putting the raw materials in a glass container, adding HNO3 and KMnO4, uniformly mixing so as to obtain a mixed oxidant, putting the nano black carbon and the mixed oxidant in a ventilating kitchen, and standing at room temperature so as to obtain the pre-oxidized nano black carbon; heating the pre-oxidized nano black carbon by utilizing a constant temperature water bath kettle, thus obtaining the oxidized nano black carbon; centrifuging the oxidized nano black carbon in a centrifugal machine, and pouring the supernatant; adding distilled water, and repeatedly centrifuging until the pH value of the centrifuged supernatant is more than 5.5, thus obtaining the washed modified nano black carbon; and controlling the temperature of the washed modified nano black carbon to be 105 DEG C, and drying in a dryer, thus obtaining the product. The method is simple in process principle, low in preparation cost, high in product quality, environment-friendly in production, high in economic benefits, wide in product application range and good in a using effect.

Description

Technical field: [0001] The invention belongs to the technical field of preparation of new materials, and relates to a novel preparation process of a nano-black carbon surface-modified passivator applied to the passivation restoration of heavy metal-contaminated soil, in particular to a nano-black carbon passivation agent for heavy metal-contaminated soil restoration method of preparation. Background technique: [0002] The problem of soil heavy metal pollution in my country is becoming more and more serious, especially Pb, Cd, Cu, Hg and their compound pollution are becoming more and more prominent and the area of ​​farmland with mild heavy metal pollution is constantly expanding. One of the most promising technologies for the remediation of complex contaminated soils. The key to the successful application of this technology is to prepare a passivating agent with high repair efficiency and strong passivation stability. Black carbon (Black Carbon) is converted from the vola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B09C1/00
Inventor 成杰民刘玉真孙艳王汉卫
Owner SHANDONG NORMAL UNIV
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