改性稻壳灰及其在有机废水处理中的应用
发布时间：2018-08-12 21:00
【摘要】：稻壳作为稻谷加工后的副产品,经发电厂焚烧产生,稻壳灰本身硅含量高,且具有大的比表面积和孔道,因此本文研究稻壳灰改性后对有机废水吸附性能,同时将改性过程中产生的水玻璃作为原材料制备介孔硅材料,实现了稻壳废物的多次利用,达到以废治废的良好成效。对稻壳灰(RHA),HF处理后的稻壳灰(RHA/HF)、NaOH处理后的稻壳灰(RHA/NaOH)进行了一些结构表征及组成分析。表明经过氢氟酸处理后的稻壳灰SiO2的峰消失,经过氢氧化钠处理后SiO2的峰减弱,碳的衍射峰没有出现明显变化。改性后的稻壳灰整体比表面积和孔容均增加,且用氢氟酸改性后的稻壳灰比表面积最大。本文以稻壳灰作为吸附剂,吸附亚甲基蓝溶液,当亚甲基蓝的初始浓度为80mg/L时,控制pH在8左右,温度约15℃,转速约为110r/min,稻壳灰的添加量为15g/L,吸附时间约为85min时,可达到最佳吸附效果。以被改性过的稻壳灰作为吸附剂,当亚甲基蓝的初始浓度为130 mg/L时,控制pH为8,温度约为15℃,转速为90r/min,稻壳灰的投加量为15g/L,吸附时间约为120 min时,可达到最佳吸附效果。通过改变体系中亚甲基蓝的初始浓度,模拟了吸附等温线,表明稻壳灰和被氢氟酸处理后的稻壳灰对亚甲基蓝的吸附均比较符合Langmuir吸附等温式,属于单层吸附。同时通过改变接触时间,研究了改性稻壳灰吸附亚甲基蓝的吸附动力学,得到三种材料对亚甲基蓝的吸附过程均符合准一级吸附动力学方程。比较RHA、RHA/NaOH、RHA/HF对亚甲基蓝的吸附效果,结果是氢氟酸处理后的稻壳灰吸附效果最好,更容易吸附亚甲基蓝。探讨了介孔RHMCM-41和功能化MCM-41对水中苯酚的吸附过程,考察了吸附时间、温度等外界因素对介孔氧化硅吸附剂吸附苯酚的影响,并探讨了吸附动力学、吸附等温线、吸附热力学,初步探讨了吸附机理。从平衡吸附量来看,CH3-MCM-41对苯酚的吸附能力与RHMCM-41有了较大的提高,改性后材料的吸附稳定性能大大提高,RHMCM-41和CH3-MCM-41对苯酚的吸附都符合伪二级动力学,这两种材料对苯酚吸附进行Freundlich等温线拟合。均能很好拟合。
[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，
本文编号：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，
本文编号：2180352
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