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Iron and manganese oxide composite modified zeolite as well as preparation method and application thereof

An iron-manganese oxide and composite modification technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of limited processing efficiency and complicated preparation process, and achieve fast adsorption rate and simple preparation method. , the effect of high removal efficiency

Active Publication Date: 2015-05-27
JINAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, some methods have relatively complicated preparation process or limited treatment efficiency (preparation method of inorganic-organic composite adsorbent based on clinoptilolite and its application to remove Cr(Ⅵ) in industrial wastewater; 101797496A)

Method used

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  • Iron and manganese oxide composite modified zeolite as well as preparation method and application thereof
  • Iron and manganese oxide composite modified zeolite as well as preparation method and application thereof
  • Iron and manganese oxide composite modified zeolite as well as preparation method and application thereof

Examples

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preparation example Construction

[0034] The invention provides a preparation method of iron-manganese oxide composite modified zeolite, such as figure 1 shown, including the following steps:

[0035] (1) Mechanically pulverize the natural zeolite and sieve it with 100-150 meshes, wash it with distilled water, and use 0.1-0.2mol·L -1 Soak in NaOH solution for 5 to 10 minutes, then filter; then use 0.1 to 0.2 mol·L -1 Soak in HCl solution for 5-10 minutes, filter again, wash with deionized water for 3-5 minutes, and finally dry at 100-105°C to obtain zeolite A;

[0036] (2) Control the reaction temperature at 40-45°C, and add the zeolite A prepared in step (1) to 0.5mol L -1 FeCl 3 In the acidic solution, mix well, add H at a volume ratio of 25:1 to 75:1 2 o 2(30%) solution, reacted 20~30min, filtered to obtain zeolite B;

[0037] (3) After rinsing the zeolite B obtained in step (2) with deionized water for 3 to 5 minutes, add it to deionized water at a weight ratio of 1:100. 2 Add 0.2~0.5mol·L under the...

Embodiment 1

[0041] A preparation method of iron-manganese oxide composite modified zeolite, comprising the following steps:

[0042] (1) Mechanically pulverize the natural zeolite (select a natural mordenite in Heyuan, Guangdong) and wash it with distilled water after sieving with 150 mesh. -1 Soak in NaOH solution for 10min, then filter with vinylon filter cloth, and then use 0.1mol·L -1 Soak in HCl solution for 10 minutes, filter again, wash with deionized water for 5 minutes, and dry at 105°C to obtain zeolite A;

[0043] (2) Control the reaction temperature at 42°C, and add zeolite A to 0.5mol L -1 FeCl 3 In the acidic solution, mix well and add H at a volume ratio of 50:1 2 o 2 (30%) solution, filter after reaction 20min to obtain zeolite B;

[0044] (3) After rinsing zeolite B with deionized water for 5 minutes, add it to deionized water at a weight ratio of 1:100, and 2 Add 0.2mol·L under protective atmosphere and magnetic stirring -1 MnSO 4 The solution starts to appear bl...

Embodiment 2

[0054] A preparation method of iron-manganese oxide composite modified zeolite, the difference between this embodiment and embodiment 1 is the addition of H in step (2) 2 o 2 (30%) volume ratio is 25:1, MnSO in step (3) 4 The solution concentration is 0.5mol L -1 , other steps and parameters are the same as in Example 1.

[0055] The Cr(Ⅵ) wastewater discharged from the production workshop of an electroplating enterprise was as high as 13-45 mg·L -1 , pH is 2-4. Use the iron-manganese oxide composite modified zeolite prepared in this example to treat the problem of excessive Cr(VI) in the above-mentioned industrial wastewater: that is, first add lime to adjust the pH to 7.5, and then add 3g L -1 The iron-manganese oxide modified zeolite, the adsorption time is 30min, and then add 5mg·L -1 The PFS coagulant settles for 30 minutes, and the effluent can be reduced to 0.3-0.5 mg·L after filtering through quartz sand -1 , to meet the emission standards.

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Abstract

The invention discloses iron and manganese oxide composite modified zeolite as well as a preparation method and application thereof. The preparation method particularly comprises the following steps: crushing and sieving natural zeolite, and carrying out acid and alkali pre-treatment; mixing the zeolite with an FeCl3 solution with a certain concentration to react to prepare an iron oxide modified zeolite material; mixing the iron oxide modified zeolite material with an MnSO4 solution with a certain concentration to react; and washing and drying at a low temperature to obtain an adsorption material which has a higher adsorption capability on Cr(VI) and a larger specific surface area. According to the iron and manganese oxide composite modified zeolite, the natural zeolite and the loaded iron oxide and manganese oxide are compounds in nature, and thus the iron and manganese oxide composite modified zeolite has no biological toxin, is safe to use and has no pollution. The method has the advantages that raw materials are easy to obtain, a preparation process is simple, reaction conditions are moderate, and the preparation cost is relatively low; and the method is particularly suitable for treating low-concentration industrial wastewater and sudden Cr(VI) pollution accident drinking water, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of environmental protection and chemical separation, and in particular relates to an iron-manganese oxide composite modified zeolite and its preparation method and application. Background technique [0002] Chromium is one of the non-essential elements in the human body. Chromium in nature is divided into trivalent and hexavalent. Among them, hexavalent chromium [Cr(Ⅵ)] can interact with glutamic acid, ascorbic acid and citric acid in cells due to its oxidative properties. Salt, etc. react, causing damage to the cell membranes and nucleic acid bases of organisms and human bodies, and producing toxic effects such as carcinogenicity and mutagenesis. my country's "Drinking Water Hygienic Standards (GB5749-2006)" stipulates that Cr(Ⅵ) in drinking water shall not exceed 0.05mg·L -1 For waste water, the limit value of 0.5mg L is implemented in "Electroplating Pollutant Discharge Standard (GB21900-2008)" and "Urban Sewage T...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30C02F1/28C02F1/62C02F101/22
Inventor 任刚余燕
Owner JINAN UNIVERSITY
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