| 李林璇,廖云开,范世锁.改性秸秆-Fe3O4复合材料对染料废水中亚甲基蓝的去除研究[J].农业环境科学学报,2019,38(5):1130-1141. |
| 改性秸秆-Fe3O4复合材料对染料废水中亚甲基蓝的去除研究 |
| Removal of methylene blue in aqueous solution by citric acid-modified rice straw loaded with Fe3O4 composite |
| 投稿时间：2018-08-02 |
| DOI：10.11654/jaes.2018-0993 |
| 中文关键词: 柠檬酸 改性秸秆 磁性Fe3O4 亚甲基蓝 官能团 吸附 |
| 英文关键词: citric acid modified rice straw magnetic Fe3O4 methylene blue functional groups adsorption |
| 基金项目:国家自然科学基金项目（51809001）；安徽省高校自然科学重点项目（KJ2018A0125）；茶树生物学与资源利用国家重点实验室开放课题（SKLTOF20170117） |
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| 摘要点击次数: 1993 |
| 全文下载次数: 1976 |
| 中文摘要: |
| 利用柠檬酸（CA）对秸秆（RS）进行改性制备改性秸秆（CA-RS），并通过化学沉淀法负载Fe3O4以制得柠檬酸改性秸秆-Fe3O4（CA-RS-Fe）复合材料，利用FTIR和XPS对CA-RS、CA-RS-Fe进行表征，研究在不同固液比、温度、溶液初始pH和浓度条件下，其对溶液中亚甲基蓝（MB）的吸附去除效果。结果表明：固液比为1.0 g·L-1、pH在3.0~11.0范围内时，CA-RS对MB去除率达95%以上。拟二级动力学模型能较好地拟合CA-RS和CA-RS-Fe对MB的去除过程。Langmuir模型可以描述MB在CA-RS和CA-RS-Fe表面的吸附。FTIR和XPS分析表明CA-RS表面官能团中的羧基在MB吸附过程中发挥重要作用。CA-RS对MB的吸附机理包括静电作用、氢键和π-π作用。Fe3O4的引入减少了CA-RS表面羧基的数量，降低了其对MB的吸附能力，但能实现快速固液分离。研究表明，CA-RS可作为去除染料废水中MB的良好吸附剂，CA-RS负铁之后会降低对MB的吸附量，但有利于提升固液分离效果。 |
| 英文摘要: |
| For this study, two adsorption materials, citric-acid-modified rice straw (CA-RS) and citric-acid modified rice straw loaded with Fe3O4 (CA-RS-Fe) were prepared via the chemical precipitation method. The adsorption materials were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) techniques. Their adsorption ability for methylene blue (MB) removal in an aqueous solution was investigated. Influencing factors, including solid-to-liquid ratios, temperature, solution pH, and concentrations, were evaluated. Results showed that at the optimal solid-to-liquid ratio of 1.0 g·L-1, more than 95% of MB was removed by CA-RS with a pH ranging from 3.0~11.0. Adsorption kinetics of MB by the CA-RS and CA-RS-Fe methods could be well-described by the pseudo-second-order kinetics model. Furthermore, the Langmuir isotherm equation could describe the adsorption of MB on CA-RS and CA-RS-Fe. The characterization results of FTIR and XPS, before and after adsorption, reveal that functional groups, especially carboxyl group in the CA-RS, played important roles in MB removal. The interaction mechanisms between MB and CA-RS involved electrostatic attraction, hydrogen bonding, and π-π interaction. Introduction of Fe3O4 reduced the amount of carboxyl groups and decreased the adsorption of MB. However, rapid and simple solid-liquid separation was achieved, owing to the existence of Fe3O4. This indicates that CA-RS could be a good adsorbent for MB dye-removal from wastewater, and the loading of Fe3O4 in CA-RS can be beneficial for solid-liquid separation. |
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