【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(duì)有機(jī)廢水吸附性能,同時(shí)將改性過(guò)程中產(chǎn)生的水玻璃作為原材料制備介孔硅材料,實(shí)現(xiàn)了稻殼廢物的多次利用,達(dá)到以廢治廢的良好成效。對(duì)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(jìn)行了一些結(jié)構(gòu)表征及組成分析。表明經(jīng)過(guò)氫氟酸處理后的稻殼灰SiO2的峰消失,經(jīng)過(guò)氫氧化鈉處理后SiO2的峰減弱,碳的衍射峰沒(méi)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(lán)溶液,當(dāng)亞甲基藍(lán)的初始濃度為80mg/L時(shí),控制pH在8左右,溫度約15℃,轉(zhuǎn)速約為110r/min,稻殼灰的添加量為15g/L,吸附時(shí)間約為85min時(shí),可達(dá)到最佳吸附效果。以被改性過(guò)的稻殼灰作為吸附劑,當(dāng)亞甲基藍(lán)的初始濃度為130 mg/L時(shí),控制pH為8,溫度約為15℃,轉(zhuǎn)速為90r/min,稻殼灰的投加量為15g/L,吸附時(shí)間約為120 min時(shí),可達(dá)到最佳吸附效果。通過(guò)改變體系中亞甲基藍(lán)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(duì)亞甲基藍(lán)的吸附均比較符合Langmuir吸附等溫式,屬于單層吸附。同時(shí)通過(guò)改變接觸時(shí)間,研究了改性稻殼灰吸附亞甲基藍(lán)的吸附動(dòng)力學(xué),得到三種材料對(duì)亞甲基藍(lán)的吸附過(guò)程均符合準(zhǔn)一級(jí)吸附動(dòng)力學(xué)方程。比較RHA、RHA/NaOH、RHA/HF對(duì)亞甲基藍(lán)的吸附效果,結(jié)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(lán)。探討了介孔R(shí)HMCM-41和功能化MCM-41對(duì)水中苯酚的吸附過(guò)程,考察了吸附時(shí)間、溫度等外界因素對(duì)介孔氧化硅吸附劑吸附苯酚的影響,并探討了吸附動(dòng)力學(xué)、吸附等溫線、吸附熱力學(xué),初步探討了吸附機(jī)理。從平衡吸附量來(lái)看,CH3-MCM-41對(duì)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(duì)苯酚的吸附都符合偽二級(jí)動(dòng)力學(xué),這兩種材料對(duì)苯酚吸附進(jìn)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(hào)：2180352