Adsorbent for removing heavy metal in water and preparation method thereof

An adsorbent and heavy metal technology, applied in the field of adsorbent for removing heavy metals in water and its preparation field, can solve the problems of poor removal effect of anionic heavy metal ions, low electric point such as manganese oxide, poor adsorption, etc., and achieve excellent water quality. The effect of purification efficiency, fast adsorption speed and low cost

Active Publication Date: 2014-12-24
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of research results show that titanium oxide has the advantages of rich resources, environmental friendliness, and good adsorption performance for heavy metals; but its adsorption effect on some neutral heavy metal ions is poor, such as trivalent arsenic, and the toxicity of trivalent arsenic Much higher than pentavalent arsenic, and has stronger mobility
Manganese oxide has the characteristics of low isoelectric point, large specific surface area, rich surface hydroxyl groups, and strong oxidizing properties. It has strong adsorption characteristics for cationic heavy metal ions, and can effectively adsorb heavy metal pollutants in water. The removal effect of heavy metal ions is not good, which is limited in practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At room temperature, weigh 30g Ti 2 (SO 4 ) 3 Dissolve in 2L water, weigh 55g TiCl 4 Dissolve in 2L water, mix the two as mixed solution A, weigh 8g KMnO 4 and 100 g of ammonia water with a mass fraction of 30% were dissolved in 1 L of water as mixed solution B. Use mixed solution B to adjust mixed solution A to pH 4-6. After adjusting the pH, the reaction was continued for 24 hours, and then aged for 12 hours. After aging, wash the solid repeatedly with deionized water until no anions are detected in the washing liquid, and dry the solid naturally at room temperature after washing to obtain a titanium-manganese composite oxide with a molar ratio of about 9:1.

Embodiment 2

[0023] At 40°C, weigh 50g Ti 2 (SO 4 ) 3 Dissolve in 2L water, as mixed solution A, weigh 10g KMnO 4 and 15g of NaOH were dissolved in 0.5L of water as mixed solution B. Use mixed solution B to adjust mixed solution A to pH 6-8. After adjusting the pH, the reaction was continued to stir for 4 hours, and then aged for 8 hours. After aging, wash the solid repeatedly with deionized water until no anions are detected in the lotion. After washing, put the solid in an oven and dry it at 100°C to obtain a titanium-manganese composite oxide with a molar ratio of about 5:1. .

Embodiment 3

[0025] At 60°C, weigh 30g Ti 2 (SO 4 ) 3 Dissolve in 2L water, weigh 40g MnSO 4 Dissolve in 2L water, mix the two as mixed solution A, weigh 35g KMnO 4 and 30g of NaOH were dissolved in 0.75L of water as mixed solution B. Use mixed solution B to adjust mixed solution A to pH 8-10. After adjusting the pH, the reaction was continued to stir for 30 minutes, and then aged for 2 hours. After aging, the solid is repeatedly washed with deionized water until no anions are detected in the washing solution, and the solid is spray-dried after washing to obtain a titanium-manganese composite oxide with a molar ratio of about 1:3.

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PUM

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Abstract

The invention relates to water treatment and application, in particular to an adsorbent for removing heavy metal in water and a preparation method thereof. The adsorbent takes titanium salt and manganese salt as raw materials, the pH value of the raw materials is adjusted to 4 to 10, and the ageing is performed, so as to obtain the adsorbent, wherein the molar ratio of titanium to manganese is (9:1)-(1:3). Titanium and manganese composite oxide prepared by the method is aggregate of nano-particles, has a larger specific surface area, is high in adsorption rate, high in adsorption capacity, and environment-friendly, and can be used for removing heavy metal ion pollutants, such as lead, cadmium, arsenic, chrome, copper, nickel, cobalt, zinc and the like in various kinds of water, such as underground water, surface water and the like.

Description

technical field [0001] The invention relates to water treatment applications, in particular to an adsorbent for removing heavy metals in water and a preparation method thereof. Background technique [0002] Heavy metals generally exist widely in nature, but due to the increasing mining, smelting, processing and commercial manufacturing activities of heavy metals, more and more heavy metals such as lead, mercury, cadmium, cobalt, etc. enter the water environment through various channels, Serious pollution of water bodies. On the one hand, it harms the aquatic ecosystem and produces various harmful effects on aquatic organisms; on the other hand, it directly or indirectly affects human health through drinking water, skin contact, and food chains. In addition, heavy metals are enriched and difficult to degrade and remove in the environment. [0003] At present, the methods of heavy metal wastewater treatment can be roughly divided into two categories: one is to convert the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F1/62
Inventor 张高生张伟陈静吴秋月
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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