Preparation method of roasted ferro-manganese hydrotalcite and application of roasted ferro-manganese hydrotalcite in adsorption of arsenic-polluted wastewater

A hydrotalcite, roasting technology, applied in water/sewage treatment, water/sludge/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of high technical cost, long cycle, secondary pollution, etc., and achieve adsorption effect Good, easy to recycle, no secondary pollution effect

Inactive Publication Date: 2014-05-07
NANJING AGRICULTURAL UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the high cost, long cycle and secondary pollution of other arsenic sewage treatment technologies in the current technology, the present i

Method used

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  • Preparation method of roasted ferro-manganese hydrotalcite and application of roasted ferro-manganese hydrotalcite in adsorption of arsenic-polluted wastewater
  • Preparation method of roasted ferro-manganese hydrotalcite and application of roasted ferro-manganese hydrotalcite in adsorption of arsenic-polluted wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 40mL of citric acid leached soil sewage (24.64mg / L arsenic) was added to a centrifuge tube filled with 100mg Mn-Fe LDO. Each centrifuge tube was shaken for 24 hours in an air bath constant temperature shaker at 25°C. The wastewater rinsed in advance is adjusted to a pH of 2-10 with 0.1mol / L hydrochloric acid or sodium hydroxide. The pH was measured with a pH meter (PHS-25, Shanghai Leici) with an acidity electrode (E-201-C, Shanghai Leici). Finally, the solution was centrifuged in a centrifuge at 4000 rpm for 10 min, and passed through a 0.45 μm filter membrane. The concentration of arsenic in the solution after adsorption was measured, and the adsorption rate of arsenic by Mn-Fe LDO at different initial test pH was obtained, as shown in figure 1 shown.

Embodiment 2

[0029] 40mL of citric acid leached soil sewage (24.64mg / L arsenic) was added to a centrifuge tube filled with 100mg Mn-Fe LDO. The initial pH of the mixed solution was 7. Each centrifuge tube was shaken in an air bath thermostatic shaker at 25°C. After a certain period of time (0.2, 0.5, 1, 2, 5, 8 and 12h), centrifuge them in a centrifuge at 4000rpm for 10min, and pass through a 0.45μm filter membrane. The concentration of arsenic in the solution after adsorption was measured, and the adsorption rate of arsenic by Mn-Fe LDO at different oscillation times was obtained, as shown in figure 2 shown.

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Abstract

The invention relates to a preparation method for roasted ferro-manganese hydrotalcite and application of the roasted ferro-manganese hydrotalcite in the adsorption of arsenic-polluted wastewater. According to the preparation method for synthesizing the roasted ferro-manganese hydrotalcite, manganese chloride and ferrous chloride are used as raw materials, and a required product is obtained by the steps of co-precipitation, crystallization, centrifugation, filtration, washing, drying, grinding, roasting and the like. When the roasted ferro-manganese hydrotalcite is used for adsorbing arsenic-containing wastewater, the adsorption capacity reaches 6.8mg/g, and high adsorption performance is exhibited. In addition, 95 percent of saturated adsorbing capacity can be achieved within 2 hours, so that the time cost of arsenic-containing wastewater treatment is greatly lowered. The adsorbed material can be separated from a water body for recycling in a centrifugation way, so that secondary pollution is alleviated.

Description

(1) Technical field [0001] The invention relates to the preparation of ferromanganese type hydrotalcite roasted product and its application in the adsorption of arsenic polluted wastewater. (2) Background technology [0002] Arsenic is a highly toxic element. Once arsenic-containing compounds enter the body, no matter through food, respiratory tract or skin, etc., it will seriously interfere with the metabolism and enzyme activity of human cells, disturb or even damage the nervous system and digestive system, and directly affect human health. normal life, and even bring serious diseases to the human body. The research found that when the concentration of arsenic in the water reaches 0.6-2.0mg / L, the human body will drink the polluted water for a long time, which will lead to various functional diseases, such as skin keratosis, pigmentation, bronchial diseases, etc., and it is more likely to induce lung cancer and skin diseases. cancer. [0003] At present, the control meth...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/30C02F1/28C02F1/62
Inventor 董长勋刘培亚陆俊鹤刘欢李玉姣赵婕文勤亮
Owner NANJING AGRICULTURAL UNIVERSITY
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