CN102744046A - Preparation method used for processing adsorbing material of waste water containing nitrobenzene - Google Patents

Abstract

The invention discloses a preparation method used for processing adsorbing material of waste water containing nitrobenzene. The method includes (1) delivering collected bagasse to a charcoal factory to conduct carbonization under 400 DEG C to obtain carbonized bagasse; (2) evenly mixing the carbonized bagasse obtained in the step (1) and sodium hydroxide water solution with mass percentage as 5-15% according to the volume ratio of 1:5-1:15, placing the mixture into a 105 DEGC drying box and drying the mixture for 12 hours to remove moisture; (3) placing products in the step (2) into a muffle furnace and activating the products for 1-2 hours under the temperature of 300-450 DEG C; and (4) taking products of the step (3) from the muffle furnace, washing the products by utilizing hydrochloric acid with volume ratio as 10%, then washing the products through ultrapure water to the neutral, placing the products in an electric heating blowing dry box, conducting drying under the temperature of 105 DEG C and grinding the products to 60 meshes to obtain the absorbing material. The preparation method is simple and easy to implement, utilizes the bagasse as raw materials, utilizes sodium hydroxide as a modifier and greatly reduces production cost. Obtained products can quicken nitrobenzene waste water, are good in processing effect and can be widely used in production procedure that nitrobenzene is removed in nitrobenzene waste water.

Description

A kind of preparation method who is used to handle the sorbing material of nitrobenzene-containing waste water

Technical field

The present invention relates to a kind of preparation method who is used to handle the sorbing material of nitrobenzene-containing waste water.

Background technology

Nitrobenzene is a kind of important material and chemical products.Army's industry develops rapidly with the industry that becomes more meticulous, and the demand of nitrobenzene is increasing.In the period of 2004, only with regard to being arranged, the nitrobenzene that surpasses 130,000 tons is discharged in the environment in the U.S..Because the nitrobenzene biodegradability is poor, long and high toxicity of pollution time, reason such as nitro phenenyl concentration height in the waste water, it is very thorny that the processing of p-nitrophenyl waste water remains.The nitrobenzene waste water processing method mainly contains both at home and abroad at present: advanced oxidation processes, and it can remove nitrobenzene efficiently and treatment process is simple relatively, but in handling water, can increase new polluter in the nitrobenzene, and equipment cost is high; Biological treatment, cost is low, and treatment effect is good, but its degradation cycle process, efficient is low; Absorption method, the fast and non-secondary pollution of adsorption rate has very big advantage.

In the last few years, domestic and international many scholars charcoal treatment nitrobenzene waste water commonly used.The active carbon specific area is big, remove the respond well of low concentration nitrobenzene, but its cost is higher, and the aspects such as mechanical strength of adsorption efficiency and material are all undesirable.Bagasse is the main byproduct of cane sugar manufacture industry; The annual bagasse that produces up to ten thousand tons in order fully to develop the use value of bagasse, is that modifier prepares the existing report of bagasse active carbon with NaOH; But up to now, strengthening charing bagasse absorption nitrobenzene waste water with NaOH does not appear in the newspapers.

Summary of the invention

The objective of the invention is to adopt charring and activation method in order to improve the absorption property of bagasse p-nitrophenyl, is modifier with NaOH, through each parameter of optimal preparation technology, a kind of preparation method who is applicable to the sorbing material of treatment of Nitrobenzene waste water is provided.

Existingly to remove that nitrobenzene adsorbents adsorb capacity is low, adsorption capacity is limited in order overcoming, and to make full use of the abundant bagasse resource in Guangxi.The present invention provides a kind of sorbing material that is used to handle nitrobenzene-containing waste water.This material, bagasse active carbon can not only make the nitro phenenyl concentration that contains the nitrobenzene aqueous solution of 200mg/L after the processing be lower than 2mg/L, and adsorption capacity is big and adsorption time is fast.When the concentration of water-soluble middle nitrobenzene was lower than 100mg/L, the concentration after the adsorption equilibrium was lower than 0.5mg/L.

Concrete steps are:

(1) bagasse of gathering is delivered to charcoal factory and carries out charing in 400 ℃, the charing bagasse;

(2) with step (1) gained charing bagasse and mass percent concentration be 5-15% sodium hydrate aqueous solution by volume 1:5-1:15 mix, put into 105 ℃ of baking ovens bakings 12 hours, oven dry moisture;

(3) step (2) product is sent in the Muffle furnace, and under 300-450 ℃ of condition activation 1-2 hour;

(4) step (3) product is taken out from Muffle furnace, the use volume ratio is 10% hydrochloric acid solution cleaning, and then with the extremely near neutrality of ultra-pure water washing, puts into electric drying oven with forced convection in 105 ℃ of dryings, and 60 orders are crossed in grinding, promptly get sorbing material.

The clearance that this sorbing material is handled the 500mg/L nitrobenzene waste water reaches 91%.

The present invention is simple for process, is raw material with the bagasse, and NaOH is modifier, has reduced production cost greatly; Products obtained therefrom can be accelerated the p-nitrophenyl wastewater treatment, and treatment effect is good, can be widely used in nitrobenzene waste water and remove the nitrobenzene production process.

The specific embodiment

Embodiment:

(1) will from sugar refinery fetch the bagasse that comes dry, pulverize, deliver to charcoal factory and carry out charing in 400 ℃, cross 20 mesh sieves, the charing bagasse;

(2) preparation mass percent concentration (m/m) is 5% sodium hydrate aqueous solution 1000g; Accurately weighing is analyzed pure cerium hydroxide sodium 50g in small beaker, has also removed the peel heavy Plastic Drum on the weighing-apparatus to transfer to after water-soluble the separating to place, and continues to add water to 1000g, makes 5% sodium hydroxide solution;

(3) take by weighing the charing bagasse 50g of step (1) gained, join step (2) and be equipped with in the Plastic Drum that the 1000g mass percent concentration is 5% sodium hydrate aqueous solution, stir, put it into and place electric drying oven with forced convection oven dry 12 hours in the evaporating dish;

(4) to be cooled, step (3) product taken out from baking oven send in the Muffle furnace, and activation 2 hours under 450 ℃ of conditions;

(5) step (4) product is taken out from Muffle furnace, the use volume ratio is 10% hydrochloric acid solution cleaning, and is extremely neutral with the ultra-pure water washing then; It is following dry 10 hours in 105 ℃ to put into electric drying oven with forced convection; Grind, cross 60 orders, getting sorbing material is NaOH modification bagasse active carbon.

In nitrobenzene-containing wastewater pH 5.8, nitro phenenyl concentration 50-500mg/L is that 1:30 adds and handles according to nitrobenzene and above-mentioned sorbing material mass ratio, and 1.5 hours times of contact, the clearance that records nitrobenzene with gas chromatography is greater than 91%.

In nitrobenzene-containing wastewater pH 5.8; Nitro phenenyl concentration 200mg/L is that 1:5-80 adds and handles 90 minutes times of contact according to nitrobenzene and above-mentioned sorbing material mass ratio; Use gas chromatography determination, surpass the mass concentration that adds than 1:30 nitrobenzene and be lower than 1mgL ^-1, reach nitrobenzene class pollutant discharging primary standard in China's " integrated wastewater discharge standard " (GB 8978-1996).

Claims (1)

1. preparation method who is used to handle the sorbing material of nitrobenzene-containing waste water is characterized in that concrete steps are:

(1) bagasse of gathering is delivered to charcoal factory and carries out charing in 400 ℃, the charing bagasse;

(2) with step (1) gained charing bagasse and mass percent concentration be 5-15% sodium hydrate aqueous solution by volume 1:5-1:15 mix, put into 105 ℃ of baking ovens bakings 12 hours, oven dry moisture;

(3) step (2) product is sent in the Muffle furnace, and under 300-450 ℃ of condition activation 1-2 hour;

(4) step (3) product is taken out from Muffle furnace, the use volume ratio is 10% hydrochloric acid solution cleaning, and then with the extremely near neutrality of ultra-pure water washing, puts into electric drying oven with forced convection in 105 ℃ of dryings, and 60 orders are crossed in grinding, promptly get sorbing material.