Preparation method of nano hydroxylapatite adsorbent for absorbing heavy metal ions in waste water

A technology of nano-hydroxyapatite and heavy metal ions, which is applied in the fields of non-metal elements, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the limitations of the wide application of hydroxyapatite, complex artificial synthesis, complex preparation process, etc. problems, achieve the effect of improving chemical uniformity, simple process and low cost

Inactive Publication Date: 2012-03-21
SHENYANG UNIV
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Problems solved by technology

At present, the adsorption properties of natural hydroxyapatite, synthetic hydroxyapatite, and modified hydroxyapatite such as carbon hydroxyapatite have been studied at home and abroad (F.Fernane et al., Materials Science and Engineering C, 2010 , 30:1060-1064; Zizhong Zhang et al., Environmental Pollution, 2010,158:514-519; Chinese patent, application number 200910088835.6), but its artificial synthesis is rel

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  • Preparation method of nano hydroxylapatite adsorbent for absorbing heavy metal ions in waste water

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Embodiment 1

[0015] A preparation method of nano-hydroxyapatite adsorbent for the adsorption of heavy metal ions in wastewater is as follows:

[0016] 1. Preparation of calcium and phosphorus precursor solutions: prepare 0.1 mol / liter of calcium nitrate (Ca(NO 3 ) 2 ) with 0.3 mol / L phosphoric acid (H 3 PO 4 ) aqueous solution; after the calcium nitrate and phosphoric acid solutions are stirred uniformly, ammonia water (NH 4 OH) was added dropwise to the phosphoric acid solution, and the pH value was adjusted to 10 to obtain a precursor solution containing calcium and phosphorus.

[0017] 2. Gelation process: According to the molar ratio of calcium and phosphorus of 1.5:1, the calcium-containing precursor solution is added dropwise to the phosphorus-containing precursor solution while stirring continuously to obtain a white precipitate solution, and ammonia water is continuously added during the reaction to make The pH value of the white precipitate solution is kept constant at 10; aft...

Embodiment 2

[0021] A preparation method of nano-hydroxyapatite adsorbent for the adsorption of heavy metal ions in wastewater is as follows:

[0022] 1. Preparation of calcium and phosphorus precursor solutions: prepare 0.5 mol / liter of calcium nitrate (Ca(NO 3 ) 2 ) with 0.25 mol / L phosphoric acid (H 3 PO 4 ) aqueous solution; after the calcium nitrate and phosphoric acid solutions are stirred uniformly, ammonia water (NH 4 OH) was added dropwise to the phosphoric acid solution, and the pH value was adjusted to 11 to obtain a precursor solution containing calcium and phosphorus.

[0023] 2. Gelation process: According to the molar ratio of calcium and phosphorus of 1.67:1, the calcium-containing precursor solution is added dropwise to the phosphorus-containing precursor solution, while stirring continuously, to obtain a white precipitate solution, and ammonia water is continuously added during the reaction. The pH value of the white precipitate solution is kept constant at 11; after ...

Embodiment 3

[0027] A preparation method of nano-hydroxyapatite adsorbent for the adsorption of heavy metal ions in wastewater is as follows:

[0028] 1. Preparation of calcium and phosphorus precursor solutions: prepare 0.75 mol / liter of calcium nitrate (Ca(NO 3 ) 2 ) with 0.4 mol / L phosphoric acid (H 3 PO 4 ) aqueous solution; after the calcium nitrate and phosphoric acid solutions are stirred uniformly, ammonia water (NH 4 OH) was added dropwise to the phosphoric acid solution, and the pH value was adjusted to 12 to obtain a precursor solution containing calcium and phosphorus.

[0029] 2. Gelation process: According to the molar ratio of calcium and phosphorus of 1.75:1, the calcium-containing precursor solution is added dropwise to the phosphorus-containing precursor solution while stirring continuously to obtain a white precipitate solution, and ammonia water is continuously added during the reaction to make The pH value of the white precipitate solution is kept constant at 12; a...

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Abstract

The invention discloses a preparation method of a nano hydroxylapatite adsorbent for absorbing heavy metal ions in waste water, comprising the following steps of: 1. preparing a precursory solution containing calcium and a precursory solution containing phosphorus: respectively preparing calcium nitrate with the concentration of 0.1-1mol/L and a phosphoric acid solution with the concentration of 0.1-0.5mol/L, and dropwise adding ammonia into the phosphoric acid solution, wherein the pH value is 10-12; 2. dropwise adding the precursory solution containing calcium into the precursory solution containing phosphorus, stirring to obtain a solution with white sediments, controlling the pH value constantly at 10-12; carrying out post-aging for 5-24h to obtain gel; and 3. placing the gel into a drying oven to dry at 55-100 DEG C for 10-24h to obtain xerogel, washing the xerogel by using distilled water 3-5 times, ball-milling for 12-24h, drying at 100 DEG C for 6-10h, calcining at 500-900, and preserving the heat for 2-6h to obtain the nano hydroxylapatite adsorbent. The invention has the characteristics of low cost, simple process and high adsorption efficiency.

Description

technical field [0001] The invention belongs to the technical field of heavy metal sewage treatment, in particular to a preparation method of an adsorbent composed of apatite. Background technique [0002] Heavy metal wastewater mainly comes from mining, mineral processing, smelting, electroplating, chemical industry, tanning and papermaking industries, etc. Heavy metals such as lead, mercury, chromium, cadmium, nickel, copper and zinc produced by these industries account for a considerable proportion of industrial wastewater , and it is difficult to handle, causing serious environmental pollution and waste of resources. The development of heavy metal wastewater treatment technology is not only beneficial to environmental protection, but also can promote industrial development and the progress of human society. [0003] In terms of remediation and treatment of heavy metal pollution in water, chemical precipitation methods, ion exchange methods, electrolysis methods, biologi...

Claims

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Application Information

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IPC IPC(8): C01B25/32B01J20/02C02F1/28
Inventor 王少洪王浩侯朝霞胡小丹陆浩然牛厂磊薛召露王彩
Owner SHENYANG UNIV
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