改性稻殼灰及其在有機廢水處理中的應用
發(fā)布時間：2018-08-12 21:00
【摘要】：稻殼作為稻谷加工后的副產(chǎn)品,經(jīng)發(fā)電廠焚燒產(chǎn)生,稻殼灰本身硅含量高,且具有大的比表面積和孔道,因此本文研究稻殼灰改性后對有機廢水吸附性能,同時將改性過程中產(chǎn)生的水玻璃作為原材料制備介孔硅材料,實現(xiàn)了稻殼廢物的多次利用,達到以廢治廢的良好成效。對稻殼灰(RHA),HF處理后的稻殼灰(RHA/HF)、NaOH處理后的稻殼灰(RHA/NaOH)進行了一些結構表征及組成分析。表明經(jīng)過氫氟酸處理后的稻殼灰SiO2的峰消失,經(jīng)過氫氧化鈉處理后SiO2的峰減弱,碳的衍射峰沒有出現(xiàn)明顯變化。改性后的稻殼灰整體比表面積和孔容均增加,且用氫氟酸改性后的稻殼灰比表面積最大。本文以稻殼灰作為吸附劑,吸附亞甲基藍溶液,當亞甲基藍的初始濃度為80mg/L時,控制pH在8左右,溫度約15℃,轉速約為110r/min,稻殼灰的添加量為15g/L,吸附時間約為85min時,可達到最佳吸附效果。以被改性過的稻殼灰作為吸附劑,當亞甲基藍的初始濃度為130 mg/L時,控制pH為8,溫度約為15℃,轉速為90r/min,稻殼灰的投加量為15g/L,吸附時間約為120 min時,可達到最佳吸附效果。通過改變體系中亞甲基藍的初始濃度,模擬了吸附等溫線,表明稻殼灰和被氫氟酸處理后的稻殼灰對亞甲基藍的吸附均比較符合Langmuir吸附等溫式,屬于單層吸附。同時通過改變接觸時間,研究了改性稻殼灰吸附亞甲基藍的吸附動力學,得到三種材料對亞甲基藍的吸附過程均符合準一級吸附動力學方程。比較RHA、RHA/NaOH、RHA/HF對亞甲基藍的吸附效果,結果是氫氟酸處理后的稻殼灰吸附效果最好,更容易吸附亞甲基藍。探討了介孔RHMCM-41和功能化MCM-41對水中苯酚的吸附過程,考察了吸附時間、溫度等外界因素對介孔氧化硅吸附劑吸附苯酚的影響,并探討了吸附動力學、吸附等溫線、吸附熱力學,初步探討了吸附機理。從平衡吸附量來看,CH3-MCM-41對苯酚的吸附能力與RHMCM-41有了較大的提高,改性后材料的吸附穩(wěn)定性能大大提高,RHMCM-41和CH3-MCM-41對苯酚的吸附都符合偽二級動力學,這兩種材料對苯酚吸附進行Freundlich等溫線擬合。均能很好擬合。
[Abstract]:Rice husk, as a by-product of rice husk processing, is produced by incineration in power plant. The rice husk ash has high silicon content, large specific surface area and pore channel. Therefore, the adsorption performance of rice husk ash on organic wastewater after modification is studied in this paper. At the same time, the water glass produced in the process of modification was used as raw material to prepare mesoporous silicon material, which realized the repeated utilization of rice husk waste, and achieved a good effect of waste treatment with waste. The structure and composition of rice husk ash (RHA/NaOH) treated with (RHA) / HF treated rice husk ash (RHA/HF) and NaOH were studied. The results showed that the peak of SiO2 disappeared in rice husk ash treated with hydrofluoric acid, the peak of SiO2 decreased after treated with sodium hydroxide, and the diffraction peak of carbon did not change obviously. The whole surface area and pore volume of the modified rice husk ash increased, and the specific surface area of the rice husk ash modified with hydrofluoric acid was the largest. In this paper, rice husk ash was used as adsorbent to adsorb methylene blue solution. When the initial concentration of methylene blue is 80mg/L, the pH is about 8, the temperature is about 15 鈩，
本文編號：2180352
[Abstract]:Rice husk, as a by-product of rice husk processing, is produced by incineration in power plant. The rice husk ash has high silicon content, large specific surface area and pore channel. Therefore, the adsorption performance of rice husk ash on organic wastewater after modification is studied in this paper. At the same time, the water glass produced in the process of modification was used as raw material to prepare mesoporous silicon material, which realized the repeated utilization of rice husk waste, and achieved a good effect of waste treatment with waste. The structure and composition of rice husk ash (RHA/NaOH) treated with (RHA) / HF treated rice husk ash (RHA/HF) and NaOH were studied. The results showed that the peak of SiO2 disappeared in rice husk ash treated with hydrofluoric acid, the peak of SiO2 decreased after treated with sodium hydroxide, and the diffraction peak of carbon did not change obviously. The whole surface area and pore volume of the modified rice husk ash increased, and the specific surface area of the rice husk ash modified with hydrofluoric acid was the largest. In this paper, rice husk ash was used as adsorbent to adsorb methylene blue solution. When the initial concentration of methylene blue is 80mg/L, the pH is about 8, the temperature is about 15 鈩，
本文編號：2180352
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