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Method for adsorbing nitrosodiethylamine in water based on modified activated carbon

A nitrosodiethylamine, activated carbon adsorption technology, applied in adsorption water/sewage treatment, chemical instruments and methods, water pollutants and other directions, can solve problems such as low adsorption rate, achieve high adsorption efficiency, save follow-up work, Effects without toxic side effects

Pending Publication Date: 2022-04-26
JIANGXI AGRICULTURAL UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, activated carbons that have been widely studied include biological activated carbon (BAC), powdered activated carbon (PAC) and granular activated carbon (GAC). These three materials have certain adsorption effects on N-DBPs, but the adsorption rate is relatively low.

Method used

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  • Method for adsorbing nitrosodiethylamine in water based on modified activated carbon
  • Method for adsorbing nitrosodiethylamine in water based on modified activated carbon
  • Method for adsorbing nitrosodiethylamine in water based on modified activated carbon

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Experimental program
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Effect test

Embodiment 1

[0035] Embodiment 1: Activated carbon modification condition screening

[0036] Weigh a certain amount of activated carbon washed with deionized water and dried, and mainly consider the influence of three factors including permanganate concentration, roasting temperature and roasting time on the adsorption performance. A total of 18 groups of screening tests for activated carbon modification conditions were carried out. At pH = 7, three groups of single-factor level tests were set up through the single-factor control method. Permanganate presoaking, in which the roasting temperature was set to 200°C, 300°C, 400°C, 500°C, 600°C, 800°C, a total of six sets of tests, and the roasting time was set to 1h, 2h, 3h, 4h, 5h, 7h A total of six groups of tests were carried out, and a total of 18 groups of modified activated carbons were prepared through the above steps.

[0037] Weigh 0.5g of the above-mentioned 18 kinds of modified activated carbon and original powdered activated carbo...

Embodiment 2

[0046] Embodiment 2: the screening of adsorption reaction condition

[0047] This embodiment mainly considers the influence of adsorption time, pH and dosage on the adsorption effect. Take different amounts of modified activated carbon and add them to pH 3, 4, 5 with the amount of 0.2g / L, 0.4g / L, 0.6g / L, 0.8g / L, 1g / L, 1.2g / L respectively. , 6, 7, 8, 9 in 500mL water containing nitrosodiethylamine at the same concentration (50mg / L), after reacting for 0.5h, 1h, 2h, 3h, 4h, 5h, 6h, calculate the NDEA Adsorption effect.

[0048] The results show that when the dosage of modified activated carbon is 0.6g / L, 0.8g / L, 1g / L, the reaction time is 2 h, 5h and 6h, and the pH of the solution is 6, 8, 9, the adsorption effect on NDEA is better it is good. Therefore, according to the above results, a three-factor three-level orthogonal test was carried out to screen the adsorption reaction conditions with the best adsorption effect on nitrosodiethylamine. Among them, the factors and leve...

Embodiment 3

[0057] A method for adsorbing nitrosodiethylamine in water based on modified activated carbon, comprising the following specific steps:

[0058] S1. Modification of activated carbon: Wash the original activated carbon with deionized water, filter, and then bake in an oven at 80°C for 8 hours. Take 100 g of the dried activated carbon and place it in 1 L of permanganate with a concentration of 0.8 mol / L. Pre-soak in salt solution for 24 hours, and then place the pre-soaked activated carbon in a muffle furnace with a temperature of 400 °C for 7 hours to obtain modified activated carbon;

[0059] S2. Adsorption of nitrosodiethylamine: Add the modified activated carbon obtained in S1 to the water body containing nitrosodiethylamine at a dosage of 0.8g / L, control the pH of the water body to 6, and measure the water body after 6 hours of reaction The content of nitrosodiethylamine in the medium was calculated to obtain the adsorption rate of modified activated carbon to nitrosodiethy...

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Abstract

The invention particularly relates to a method for adsorbing nitrosodiethylamine in water based on modified activated carbon, which comprises the following specific steps: modification of activated carbon: washing original activated carbon with deionized water, filtering, baking in a baking oven at 80 DEG C for 6-10 hours, presoaking the activated carbon in a permanganate solution for 22-26 hours, and roasting in a muffle furnace at high temperature for 2-7 hours to obtain activated carbon; modified activated carbon is obtained; adsorption of nitrosodiethylamine: adding the obtained modified activated carbon into a water body containing nitrosodiethylamine, reacting for 2-6 hours, and calculating to obtain the adsorption rate of the modified activated carbon to the nitrosodiethylamine. According to the method, firstly, the activated carbon is pre-impregnated with the permanganate solution and then subjected to high-temperature roasting, more adsorption sites and surface functional groups are formed on the surface of the activated carbon after composite modification, the adsorption capacity is improved, the method combines physical adsorption and chemical adsorption, meanwhile, the adsorption condition is optimized, and the adsorption efficiency is improved. The adsorption rate of nitrosodiethylamine can be effectively improved, and the effect is remarkable.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for adsorbing nitrosodiethylamine in water based on modified activated carbon. Background technique [0002] Since the birth of the chlorination disinfection process, the risk of humans being infected by pathogenic microorganisms in drinking water has been greatly reduced. The disinfection by-products produced by the reaction of chlorine disinfectants with organic matter in water has gradually become a new problem affecting human health. The traditional chlorinated disinfection by-products are trihalomethanes (THMs) and haloacetic acids (HAAs), which are present in drinking water. The medium mass concentration can usually reach 50-100μg / L. Studies have shown that chloramine disinfection can reduce the mass concentration of THMs and HAAs to 10-30 μg / L, but chloramine disinfection produces new disinfection by-products with higher carcinogenic risk—nitr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/20C02F101/38
CPCC02F1/283B01J20/20C02F2101/38
Inventor 陆健刚蔡海生傅艳梅石先罗吴玫章卫
Owner JIANGXI AGRICULTURAL UNIVERSITY
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