CN104209088A - Preparation method of modified fly ash used for absorbing nitrophenol in waste water - Google Patents
Preparation method of modified fly ash used for absorbing nitrophenol in waste water Download PDFInfo
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- CN104209088A CN104209088A CN201410493311.6A CN201410493311A CN104209088A CN 104209088 A CN104209088 A CN 104209088A CN 201410493311 A CN201410493311 A CN 201410493311A CN 104209088 A CN104209088 A CN 104209088A
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Abstract
The invention relates to a preparation method of modified fly ash and belongs to the field of waste water treatment, in particular to the treatment method of absorption of nitrophenol in waste water. A preparation method of modified fly ash used for absorbing nitrophenol in waste water includes the following steps: grinding and screening fly ash samples, controlling the grain size within 0.045-0.150 mm, soaking the fly ash samples in the soak solution for 24 h at room temperature, filtering the fly ash samples, washing the fly ash samples through distilled water, drying the distilled water to be at balanced weight, and sealing the fly ash samples for storage to obtain modified fly ash. The preparation method has the advantages of being simple in process, strong in operability, low in cost and applicable to industrial production. Measurement proves that the prepared modified fly ash can absorb 7-8 mg/g nitrophenol in waste water.
Description
Technical field
The present invention relates to a kind of preparation method of modified coal ash, belong to especially Nitrobenzene in Wastewater phenol adsorption treatment method field of wastewater treatment.
Background technology
Flyash is the discarded object of steam power plant's pulverized coal fired boiler discharge, China's electric power be take fire coal as main, approximately there are every year nearly hundred million tons of flyash discharges, current utilization rate is only 40% left and right, be mainly used in baking bricks, build the road, cement and concrete admixture, choose aspects such as floating pearl, improvement soil, all the other are most of piles up discardedly, and this has not only taken a large amount of soils, and severe contamination environment., by total utilization of PCA, be how the important subject of current environmental science.Flyash is the porous spherical fine particle with certain activity, for impurity in water, has good absorption property, and utilizing flyash to process industrial wastewater is the treatment of wastes with processes of wastes against one another, and it is low effective to process waste water expense.Environmental scientific research personnel have done a large amount of research work in this respect, have obtained many achievements that attract people's attention.
Town gas provides many convenience to city dweller's life, but the pollution of the phenol wastewater of discharge is still quite serious, because concentration is extremely low, removes these Toxics and have certain difficulty from water.At present, processing this class waste water has Physical, chemical method and bioanalysis, but latter two method is difficult to eliminate nuisance.Absorption method is widely applied in water treatment, though the adsorption effect that powdered activated carbon has had, disposal cost is high, is difficult to be applied and promote in actual waste water is processed.
Therefore, study a kind of absorption property good, the nitrophenol advantages of good adsorption effect in waste water and the low modified coal ash of cost are had to very high application prospect.
Summary of the invention
The present invention aims to provide that a kind of absorption property is good, the preparation method to the nitrophenol advantages of good adsorption effect in waste water and the low modified coal ash of cost.
The preparation method of the modified coal ash for the absorption of Nitrobenzene in Wastewater phenol of the present invention, comprises the following steps:
Flyash sample is sieved through grinding, particle diameter is controlled to 0.045-0.150mm, under room temperature, with soak, soak 24h, filter, distilled water washing, is dried to weight, and sealed storage obtains modified coal ash.
Preferably, the aluminum nitrate solution that soak of the present invention is 0.1m0l/L or the ferric chloride solution of 0.1m0l/L.
Preferred, flyash particle diameter of the present invention is 0.045-0.055mm.
In preparation method of the present invention, the main chemical composition of flyash used is (%): silica 52.45, alundum (Al2O3) 20.78, di-iron trioxide 8.55, calcium oxide 2.16, magnesia 1.40, sulfur trioxide 0.58, sodium oxide molybdena 0.65, potassium oxide 1.04, loss on ignition 9.84, after soaking by deionized water, the PH value of solution is 7.8.
The principal element of the modified coal ash p-nitrophenol absorption property that the present invention is prepared, the particle diameter of flyash reduces adsorption capacity and increases, this point can be explained from the composition of flyash, the chemical composition of flyash is mainly silicon and aluminium oxide, its content increases along with reducing of flyash particle diameter, moreover the silicon in flyash and alumina content play an important role in the removal of phenol, this is because the lone electron on the phenolic hydroxyl group oxygen of p-nitrophenol can form strong chemical bond with central ion and the weakly acidic alumina surface of tool of flyash mesosilicic acid salt, when the small particle diameter ratio of flyash increases, adsorbance slightly increases.
During use, hydrogen ion concentration in waste water (PH) is the main influence factor of absorption, mainly to affect the ionization of p-nitrophenol and the performance on flyash surface, pH value is less, acidity is larger, in solution, the removal effect of p-nitrophenol is better, this may be due to the variation of the formed hydrous oxide in flyash surface with pH value, in PH value hour, the synergy that forms the positive charge surface of lone pair electrons on the hydroxyl oxygen of conjugation and flyash with phenyl ring forms key, moreover hour completely likely reduce the elecrtonegativity on flyash surface in PH value, but in alkaline medium, the anion that p-nitrophenol can form with alkali effect para-nitrophenoxide anion and flyash surface repels, greatly reduce the clearance of p-nitrophenol.
Adsorption mechanism: fly ash grain can be comprised of low iron glass body, high ferro vitreum, porous vitreum and carbon granules substantially, burning degree completely flyash substantially goes up by bead and forms, but most flyash burning is all incomplete, from selected flyash chemical composition, it contains 9.84% loss on ignition, can think that its porous vitreum, porous carbon granules and coke content are higher, in adsorption process, these porous compositions have certain suction-operated; Moreover a certain amount of silicate mineral and vitreum in the adhesion of porous carbon intragranular, these silicate minerals are mainly mullite, quartz, calcite, corundum and trace magnetic iron ore, feldspar etc., these silicate minerals are met after water, the hydrous oxide forming on flyash surface, under different pH values, show cation, neutral molecule and anion state, p-nitrophenol in solution is produced to different adsorption effects, therefore, Powder ash adsorption p-nitrophenol can be thought due to the common result of porous mass and electrostatic interaction.
Preparation method of the present invention, has technique simple, workable, and cost is low, is applicable to the features such as suitability for industrialized production, after measured, prepared modified coal ash to the nitrophenol adsorbance in waste water at 7-8mg/g.
The specific embodiment
Embodiment mono-:
Flyash sample is sieved through grinding, particle diameter is controlled to 0.045-0.055mm, the aluminum nitrate solution with 0.1m0l/L under room temperature soaks 24h, filters, and distilled water washing, is dried to weight, and sealed storage obtains modified coal ash.
Embodiment bis-:
Flyash sample is sieved through grinding, particle diameter is controlled to 0.045-0.055mm, the ferric chloride solution with 0.1m0l/L under room temperature soaks 24h, filters, and distilled water washing, is dried to weight, and sealed storage obtains modified coal ash.
Embodiment tri-: adsorption experiment
Accurately taking made each 1g of modified coal ash of the made modified coal ash of flyash, embodiment mono-and embodiment bis-is in the conical flask of p-nitrophenyl phenol solution of 250-500mg/L with adding 25mL concentration, control temperature at 50 ℃, with the nitric acid of 0.01m0l/L, regulate pH value to 3,30min vibrates on oscillator, take out and filter, distilled water washing, by the concentration of p-nitrophenol in forint phenol spectrphotometric method for measuring filtrate and calculate adsorbance.
During table with test results, the adsorbance of the modified coal ash that the modified coal ash that flyash, embodiment mono-are made and embodiment bis-are made is respectively 2.5mg/g, 8.0mg/g and 7.0mg/g.
Claims (3)
1. the preparation method of the modified coal ash adsorbing for Nitrobenzene in Wastewater phenol, comprises the following steps:
Flyash sample is sieved through grinding, particle diameter is controlled to 0.045-0.150mm, under room temperature, with soak, soak 24h, filter, distilled water washing, is dried to weight, and sealed storage obtains modified coal ash.
2. the preparation method of the modified coal ash for Nitrobenzene in Wastewater phenol absorption as claimed in claim 1, is characterized in that aluminum nitrate solution that described soak is 0.1mol/L or the ferric chloride solution of 0.1mol/L.
3. the preparation method of the modified coal ash for the absorption of Nitrobenzene in Wastewater phenol as claimed in claim 1, is characterized in that described flyash particle diameter is 0.045-0.055mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106241934A (en) * | 2016-08-04 | 2016-12-21 | 西北矿冶研究院 | Method for reducing content of phenol in water by using unburned carbon in solid waste fly ash |
| CN106345398A (en) * | 2016-09-12 | 2017-01-25 | 武汉工程大学 | Preparation method of modified coal ash adsorbent |
| CN109126647A (en) * | 2018-09-08 | 2019-01-04 | 佛山市森昂生物科技有限公司 | A kind of preparation method of graphene oxide-sodium alginate gel ball |
| CN111264113A (en) * | 2020-03-09 | 2020-06-12 | 张晨 | Modified fly ash material for improving desertified land, composite material and improvement method |
| CN113943078A (en) * | 2021-10-28 | 2022-01-18 | 内蒙古万众炜业科技环保股份公司 | Treatment process for sewage generated by coal cracking |
-
2014
- 2014-09-24 CN CN201410493311.6A patent/CN104209088A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106241934A (en) * | 2016-08-04 | 2016-12-21 | 西北矿冶研究院 | Method for reducing content of phenol in water by using unburned carbon in solid waste fly ash |
| CN106345398A (en) * | 2016-09-12 | 2017-01-25 | 武汉工程大学 | Preparation method of modified coal ash adsorbent |
| CN109126647A (en) * | 2018-09-08 | 2019-01-04 | 佛山市森昂生物科技有限公司 | A kind of preparation method of graphene oxide-sodium alginate gel ball |
| CN109126647B (en) * | 2018-09-08 | 2020-11-03 | 特勃尔润滑技术(江苏)有限公司 | Preparation method of graphene oxide-sodium alginate gel spheres |
| CN111264113A (en) * | 2020-03-09 | 2020-06-12 | 张晨 | Modified fly ash material for improving desertified land, composite material and improvement method |
| CN113943078A (en) * | 2021-10-28 | 2022-01-18 | 内蒙古万众炜业科技环保股份公司 | Treatment process for sewage generated by coal cracking |
| CN113943078B (en) * | 2021-10-28 | 2023-07-21 | 内蒙古万众炜业科技环保股份公司 | Sewage treatment process for coal pyrolysis |
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Application publication date: 20141217 |