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Nano iron/oyster shell composite material, and preparation method and application thereof

A composite material, oyster shell technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve the problems of increased stability and controllability of composite materials, easy loss, oxidation, etc. Solving problems, stable performance, and solving the effect of easy agglomeration

Inactive Publication Date: 2015-04-29
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention prepares nano-iron / oyster shell mesoporous nanocomposites by in situ reduction in the internal and external pores of oyster shells by chemical reduction, which enhances the uniformity, dispersibility and oxidation resistance of nano-iron in the composite material, and solves the problem of traditional physical In the dipping and spraying loading methods, it is difficult for nanomaterials to enter the pores of the loading material, and it is easy to lose and be oxidized; at the same time, compared with the hydrolysis method of nanomaterials, since the nano-iron in the composite material is prepared by chemical reaction, so that The stability and controllability of composite materials are also greatly increased

Method used

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  • Nano iron/oyster shell composite material, and preparation method and application thereof
  • Nano iron/oyster shell composite material, and preparation method and application thereof
  • Nano iron/oyster shell composite material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of nanometer iron / oyster shell composite material, concrete steps are:

[0028] 1) Pretreatment of oyster shells: rinse the oyster shells with tap water, pre-burn the oyster shells at 100-600 ℃ for 1 hour, keep the temperature for 1 hour, cool naturally, grind them into 65-mesh oyster shell powder, and store them in a desiccator for later use; the programmed temperature rise interval is 100 ℃;

[0029] 2) In-situ synthesis of composite materials: 1 g of oyster shell powder and 30 mL (0.45 mol / L) of iron source solution in step 1) were added into a three-neck flask, and mixed with ultrasonic-assisted mechanical stirring at low speed for 30 min (stirring speed 500 r / L). min, ultrasonic power 100 W, mixing temperature 20 ℃), then add KBH dropwise under nitrogen protection 4 Solution (0.9 mol / L) 5 mL, ultrasonically assisted mechanical medium-speed stirring reaction for 15 min (stirring speed 1000 r / min, ultrasonic power 100 W, reaction temperature 2...

Embodiment 2

[0033] NaBH 4 and KBH 4 As reducing agent, 65 mesh oyster shell powder, FeSO 4 Be iron source, all the other parameters are identical with embodiment 1. Add the same amount of composite materials prepared by different reducing agents into the arsenic stock solution (pH: 7, arsenic concentration: 2 mg / L), set up three groups of parallel and blank samples for each condition, and use nitrogen to exhaust the upper layer of air, then use After the plastic wrap was sealed, put it into a constant temperature shaking box to react for 24 hours (rotational speed: 200 r / min, temperature: 20 ℃), the supernatant was taken to measure the arsenic concentration, and the composite materials prepared with different reducing agents were compared to the arsenic concentration in the solution. The removal effect is shown in Table 1. when in KBH 4 When used as a reducing agent, the removal effect of arsenic in the solution can reach 99.80%, and the effect is remarkable.

[0034] Table 1 Effect ...

Embodiment 3

[0037] Choose 10, 35, 65, 100, 200 mesh oyster shell powder, FeSO 4 For Iron Source, KBH 4 Be reducing agent, all the other parameters are identical with embodiment 1. The same amount of composite materials prepared from oyster shell powder with different meshes was added to the arsenic stock solution (pH: 7, arsenic concentration: 2 mg / L). Three groups of parallel and blank samples were set up for each condition, and the upper layer of air was exhausted with nitrogen gas. , sealed with plastic wrap and placed in a constant temperature oscillation box to react for 24 h (rotational speed: 200 r / min, temperature: 20 ℃), the supernatant was taken to measure the arsenic concentration, and the composite materials prepared by oyster shell powder with different meshes were compared The removal effect of arsenic in the solution, such as figure 2 shown. from figure 2 It can be seen from the figure that when the oyster shell powder mesh is lower than 100 mesh, the removal rate of ...

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Abstract

The invention discloses a nano iron / oyster shell composite material, and a preparation method and application thereof. The method comprises the following steps: activating the oyster shell by programmed heating and presintering; carrying out mechanical stirring and ultrasonic oscillation until iron ions or ferrous ions and the reducer are well dispersed in the porous structure of the oyster shell; and carrying out chemical reduction reaction to generate zero-valent nano iron on the pores and surface of the oyster shell in situ, thereby obtaining the nano iron oyster / shell composite material. By using the natural porous structure of the oyster shell as the carrier and the abundant minor elements in the oyster shell as the catalyst, the composite material fully displays the structure and component characteristics of the oyster shell, changes wastes into valuable substances, and well solves the problem of recovery of the oyster shell. Meanwhile, the composite material solves the problems of easy aggregation, easy oxidation, easy loss, difficulty in recovery and other application limitations of the nano iron in the field of environmental pollution control and restoration, can be widely used in purifying treatment of wastewater containing heavy metals (arsenic, cadmium and the like) and phosphorus as well as restoration of arsenic-polluted soil, and has favorable effects.

Description

technical field [0001] The invention specifically relates to a nano-iron / oyster shell composite material and its preparation method and application, and belongs to the field of preparation of novel environmental pollution control and restoration materials. Background technique [0002] With the scale of oyster farming, how to recycle oyster shells, which account for 60% of the oyster mass, to reduce environmental pollution is an essential part of achieving sustainable development of the oyster industry. Oyster shells have a natural porous structure, the main component of which is CaCO 3 , and rich in trace elements. In the field of environmental pollution control, its porous structure is often used as an adsorbent. For example, patents 200910070793.3 (a natural adsorbent for removing heavy metal ions in water and its preparation method and application) and 200910112699.X (oyster shell filler biofilter sewage phosphorus removal device), respectively use the adsorption of oy...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J27/232C02F1/28C02F1/58C02F1/62B09C1/08
CPCB01J20/22C02F1/286C02F1/58C02F1/62B01J27/232B09C1/08B01J2220/4881B01J35/60
Inventor 范立维张水丽卢泽湘张晓华周华吴振国王思群
Owner FUJIAN AGRI & FORESTRY UNIV
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