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Dolomite limestone-iron oxide-nano chitosan composite material based on mantou formation mineral rocks and preparation and application thereof

A technology of dolomitic limestone and nano-chitosan, which is applied to water pollutants, other chemical processes, chemical instruments and methods, etc. problem, to achieve the effect of good adsorption and removal effect

Inactive Publication Date: 2018-08-03
广东国宇环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 102807872A discloses a method for preparing a heavy metal adsorbent by combining a variety of natural mineral powders and biochar. The adsorbent is used to effectively reduce the content of available heavy metals. However, the adsorption efficiency of the above patents for heavy metals is still slightly low, and The specific adsorption capacity of heavy metals in multi-metal mixed systems is not mentioned

Method used

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  • Dolomite limestone-iron oxide-nano chitosan composite material based on mantou formation mineral rocks and preparation and application thereof
  • Dolomite limestone-iron oxide-nano chitosan composite material based on mantou formation mineral rocks and preparation and application thereof
  • Dolomite limestone-iron oxide-nano chitosan composite material based on mantou formation mineral rocks and preparation and application thereof

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Embodiment 1

[0033] The preparation process and method of dolomitic limestone-iron oxide-nano chitosan composite material, the main steps of implementation are:

[0034](1) Pretreatment of dolomitic limestone (drying and crushing): dry the natural dolomitic limestone at 105°C to constant weight; mechanically crush the dried dolomitic limestone, and the crushing time is 1 ~3min, crushed and sieved to obtain dolomitic limestone powder material with particle size less than 0.5μm;

[0035] (2) Preparation of nano-chitosan: 1 g of chitosan was dissolved in 2 L of acetic acid with a concentration of 2% (v / v), and 1 L of sodium tripolyphosphate solution with a concentration of 0.75 mg / mL was added and stirred slowly. At this time, it can be seen that the solution is divided into three layers, and the top and bottom are respectively: supernatant, polymer and milky white suspension. Take out the milky white suspension and soak it in double distilled water for 1 to 3 hours, and air dry it for later ...

Embodiment 2

[0039] Investigate the main components of the dolomitic limestone-iron oxide-nano chitosan composite material involved in embodiment 1 and the physicochemical properties of the main component dolomitic limestone, as shown in table 1, carbonate minerals in the dolomitic limestone It is the main component (51.2%), of which dolomite accounts for 26.3%. According to the content of dolomite between 25% and 50%, this mineral rock material can be identified as dolomitic limestone. From the scanning electron microscope spectrum of the composite material (Figure 2), it can be seen that the surface of this material is irregular, the overall structure is block-like, and the specific surface area is large, which is conducive to the adsorption of heavy metal ions. The X-ray energy spectrum of the composite material is shown in image 3 As shown, the main constituent elements of the composite material are Si, Ca, Mg, Fe, Al, K, Na, O, C, and N. A large amount of Fe elements may partly come...

Embodiment 3

[0043] Investigate the adsorption and removal capacity of the dolomitic limestone-iron oxide-nano chitosan composite material involved in the invention embodiment 1 to cadmium, lead and nickel in a single metal system, the adsorption condition is: get 10mg composite material and place it in 100mL The initial concentration is 1-200mg / L in a single heavy metal solution system, after shaking in a constant temperature shaker at 25°C and 180r / min for 12h, measure the heavy metal content in the wastewater after adsorption, and use the following formula to calculate the adsorption capacity of the composite material for heavy metals And evaluate the heavy metal adsorption capacity of this composite material.

[0044] The formula for calculating the adsorption capacity is:

[0045] where c 1 、c 2 is the content (mg / L) of heavy metal cadmium, lead and nickel ions before and after adsorption in monometallic wastewater, v is the volume of heavy metal solution (L), m is the mass of ads...

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Abstract

The invention discloses a dolomite limestone-iron oxide-nano chitosan composite material based on mantou formation mineral rocks and preparation and application thereof, belonging to the technical field of heavy metal polluted environment remediation. The composite material mainly is prepared from natural dolomite limestone, and is combined with industrial ferric nitrate and nano chitosan. In thesingle metal system, largest adsorption capacities of cadmium, lead and nickel are respectively 80.3mg / g, 192.1mg / g and 63.4mg / g. The composite material can well adsorb and remove cadmium, lead and nickel in wastewater, can particularly adsorb heavy metal lead in a multi-metal mixed system, and can be used as a specific adsorbent to be used in a complex polluted environment. In addition, massive natural dolomite limestone exists in the natural world, is low in cost, is easy to explore, is environmentally friendly, and does not cause secondary pollution, thereby having a broad application prospect and promotion value.

Description

technical field [0001] The present invention relates to the technical field of remediation and treatment of heavy metal polluted environments, in particular to a heavy metal adsorption material and its preparation method and its application in the remediation of heavy metal polluted environments, in particular to a dolomitic limestone-iron oxide based on mineral rocks of the Mantou Formation - Nano-chitosan composite material and its preparation and its application in the field of heavy metal wastewater treatment including cadmium, lead and nickel. Background technique [0002] In recent years, due to industrial transformation and upgrading, industries such as metal welding, leather manufacturing, battery and alloy manufacturing, and mining have developed rapidly. However, the release of heavy metals in the production process has also continued to increase, and the release of heavy metal pollutants in the environment Heavy metals such as cadmium, lead, and nickel are often d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/06B01J20/04B01J20/30C02F1/28C02F101/20
CPCB01J20/043B01J20/06B01J20/24B01J2220/46B01J2220/4825C02F1/28C02F2101/20
Inventor 柯杰周镇刘展飞
Owner 广东国宇环保科技有限公司
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