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Wastewater defluorination application of iminodisuccinic acid (IDS) metal chelating type adsorbent

A technology of metal chelation and adsorbent, which is applied in the direction of adsorption of water/sewage treatment, water pollutants, water/sewage treatment, etc. It can solve the problems of poor stability, low removal rate, and small adsorption amount, and achieve a significant effect of fluoride removal , the effect of simple operation

Active Publication Date: 2018-12-14
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, -NH-(CH 2 COO - ) 2 (IDA) belongs to the aminocarboxyl functional group, because the functional group has a moderate chelating ability with metal ions, so it has the disadvantages of small adsorption capacity, low removal rate and poor stability in the application of fluorine removal.

Method used

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  • Wastewater defluorination application of iminodisuccinic acid (IDS) metal chelating type adsorbent
  • Wastewater defluorination application of iminodisuccinic acid (IDS) metal chelating type adsorbent
  • Wastewater defluorination application of iminodisuccinic acid (IDS) metal chelating type adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Metal Fe 3+ Comparison experiment of adsorption capacity on IDS-silica gel chelating adsorbent and IDA-silica gel chelating adsorbent

[0028] IDS-Fe used in the present invention 3+ - Silica gel chelating adsorbent and IDA-Fe 3+ - Silica gel chelating adsorbent, IDA-Fe 3+ -The preparation process of styrene divinylbenzene chelated adsorbent is as follows:

[0029] Connect the IDS-silica gel column, IDA-silica gel column and IDA-styrene divinylbenzene column to the chromatographic system respectively. After washing with water, inject 0.05mol / L FeCl with a pump at a flow rate of 0.5mL / min 3 NaAc-HAc buffer solution (pH=4.0) until saturated. Then let it stand for 25min, and wash off the unbound metal ions with ultrapure water and 0.02mol / L phosphate buffer in sequence 2 S test), and then washed with ultrapure water to prepare IDS-Fe respectively 3+ - Silica metal chelate adsorbent, IDA-Fe 3+ - Silica metal chelate adsorbent and IDA-Fe 3+ - Styrene divin...

Embodiment 2

[0035] Embodiment 2 adopts the ion selective electrode method to draw F - Standard curve between content and potential value

[0036] (1) Preparation of fluoride standard solution [C F － =1mg / mL]: Sodium fluoride (NaF) was dried at 500°C for about 40 minutes, cooled naturally, weighed 0.2210g, dissolved completely with ultrapure water, diluted to 100mL, constant volume, and stored in a polyethylene bottle.

[0037] (2) Fluoride standard use solution [C F － =10 μg / mL]: Take 5.00 mL of the standard preparation solution in (1) with a pipette gun, dissolve it completely with ultrapure water, and set the volume to 500 mL.

[0038](3) Sodium hydroxide solution (400g / L): Weigh 40g of sodium hydroxide (NaOH), dissolve it completely with ultrapure water and set the volume to 100mL;

[0039] (4) Glacial acetic acid solution (C 冰醋酸 =1.06g / mL)

[0040] (5) Total ionic strength adjustment buffer solution (TISAB): weigh 59g sodium chloride (NaCl), weigh 3.48g trisodium citrate (NaCl ...

Embodiment 3I

[0044] Example 3IDS-Fe 3+ - Silica metal chelate adsorbent and IDA-Fe 3+ - Silica metal chelate adsorbent, and IDA-Fe 3+ - Styrene divinylbenzene metal chelate adsorbent to conduct comparative experiments on the removal of excess fluoride in the aqueous phase system

[0045] 1. Preparation of fluorine-containing waste water simulated liquid

[0046] Accurately weigh 0.2210g of analytically pure NaF, dry it in an oven at 105°C for 2h, then dissolve and dilute it to 100mL, and store it in a polyethylene bottle. Take 15mL fluoride standard stock solution, dilute it to 1000mL, and store it in a polyethylene bottle. This solution contains 15mg / L of fluorine, and this solution is used as the simulated feed solution of fluorine-containing wastewater.

[0047] 2. IDS-Fe 3+ - Silica metal chelate adsorbent and IDA-Fe 3+ - Silica metal chelate adsorbent, and IDA-Fe 3+ - Static adsorption experiment of styrene divinylbenzene metal chelating adsorbent on excess fluoride in wastewat...

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Abstract

The invention discloses a wastewater defluorination application of an iminodisuccinic acid (IDS) metal chelating type adsorbent. The IDS metal chelating type adsorbent is formed by coordination of iminodisuccinic acid and metal ions M<n+>, and is an adsorbent with high stability and high adsorption capacity. Due to super-strong coordination of the IDS to the M<n+>, the obtained IDS-M<n+> chelatingtype adsorbent can be applied to removal of fluorides in sewage, and the adsorbent exhibits remarkable advantages of high stability and easy reproducibility in processes of removing fluorides in industrial sewage or domestic water. When the adsorbent is used, operation is simple, greenness and environment protection are achieved, and a fluorine removal effect is remarkable. In addition, comparedwith a chelating type functional ligand iminodiacetic acid (IDA) which is commonly used for fluorine removal, the adsorbent has a better effect. The IDS metal chelating type adsorbent has very important application values and significance in the aspect of removing fluorides in a water phase system.

Description

technical field [0001] The invention belongs to the technical field of fluorine removal by adsorption, and relates to the application of an IDS metal chelating adsorbent to defluoride waste water. Background technique [0002] Trace amounts of fluoride (0.7mg / L) are beneficial to the human body; however, high concentrations of fluoride (1.5-4.0mg / L) can cause dental fluorosis; when the fluoride concentration is greater than 4.0mg / L, it will eventually lead to fluorosis Osteopathy. The high concentration of fluorine in groundwater mainly comes from the natural dissolution of minerals, namely fluoroapatite, fluorite and hornblende. According to the drinking water standard of the World Health Organization (WHO), the maximum contaminant level (MCL) of fluoride is 1.5mg / L. The World Health Organization estimates that fluoride contamination of groundwater deprives hundreds of millions of people around the world of access to clean water. [0003] Fluorosis is an irreversible dis...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/22C02F101/14
CPCB01J20/223C02F1/285C02F2101/14
Inventor 李蓉陈斌李晨田旭楠
Owner NORTHWEST UNIV
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