| 糠醛渣对水中甲基橙的吸附性能 |
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| 引用本文： | 张霞,陈小燕,刘奎发,刘万毅.糠醛渣对水中甲基橙的吸附性能[J].环境科学研究,2019,32(3):507-512. |
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| 作者姓名： | 张霞 陈小燕 刘奎发 刘万毅 |
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| 作者单位： | 宁夏大学化学化工学院,省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏 银川 750021;宁夏大学化学化工学院,省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏 银川 750021;宁夏大学化学化工学院,省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏 银川 750021;宁夏大学化学化工学院,省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏 银川 750021 |
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| 基金项目： | 宁夏回族自治区自然科学基金项目（No.NZ16039） |
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| 摘 要： | 为了探究糠醛生产中的废料糠醛渣对水体中甲基橙的吸附性能和吸附机制，利用FT-IR（傅里叶变换红外光谱）和SEM（扫描电镜）对糠醛渣的结构特性进行表征，浅析糠醛渣对甲基橙的吸附机制；通过模拟试验，考察了吸附剂用量、pH、吸附时间和温度等因素对糠醛渣吸附甲基橙过程的影响；采用吸附动力学模型和吸附等温模型，进一步探讨了糖醛渣吸附机制.结果表明:①糠醛渣结构疏松多孔，表面具有丰富的官能团，有利于吸附.②糠醛渣能高效吸附水中甲基橙，在温度为293 K、pH为4~9、吸附剂用量为0.2 g时，糠醛渣对400 mg/L的甲基橙吸附效果最好；吸附过程在60 min左右达到平衡，并且较好地符合准二级动力学模型（R2=0.999 9）；吸附量随温度的升高而减少，表明该吸附过程为放热过程；在293 K时最大理论吸附量为54.35 mg/g，吸附数据更符合Langmuir吸附等温模型（R2=0.993 3），表明糠醛渣对甲基橙的吸附主要为单层吸附.③糠醛渣可再生重复利用，吸附甲基橙后的糠醛渣用0.1 mol/L氢氧化钠溶液进行解吸再生试验，第5次使用时对甲基橙仍然具有较好的吸附效果.研究显示，糠醛渣在室温条件下、较宽的pH范围内能快速高效地吸附水中的甲基橙，并且重复利用性好，是一种在偶氮染料废水处理中具有发展前景的廉价、可再生生物质吸附材料.
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| 关 键 词： | 糠醛渣 甲基橙 吸附 吸附动力学 吸附等温线 |
| 收稿时间： | 2018/3/15 0:00:00 |
| 修稿时间： | 2018/9/18 0:00:00 |
Adsorption of Methyl Orange by Furfural Residue |
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| ZHANG Xi,CHEN Xiaoyan,LIU Kuifa and LIU Wanyi.Adsorption of Methyl Orange by Furfural Residue[J].Research of Environmental Sciences,2019,32(3):507-512. |
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| Authors: | ZHANG Xi CHEN Xiaoyan LIU Kuifa and LIU Wanyi |
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| Affiliation: | State Key Laboratory of High-Efficiency Coal Utilization and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China |
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| Abstract: | In order to explore the adsorption properties and mechanism of furfural residue to methyl orange in water, the structures of furfural residue were characterized by FTIR (fourier transform infrared spectroscopy) and SEM (scanning electron microscopy). Batch adsorption studies were carried out for the adsorption of methyl orange onto the furfural residue. The experimental parameters, including adsorbent dose, pH, contact time and temperature, were investigated. The adsorption mechanisms were discussed particularly by adsorption isotherms (Langmuir and Freundlich) and kinetics models (the pseudo-first and pseudo-second-order). The results showed that:(1) The surface of furfural residue possessed porous structure and abundant functional groups which are beneficial to adsorption. (2) The optimum adsorption conditions were achieved at 293 K, pH=4-9, 0.2 g adsorbent dose and 60 min contact time with the initial concentration of methyl orange at 400 mg/L. The pseudo-second-order kinetic model (R2=0.9999) fitted the methyl orange equilibrium adsorption data well. The adsorption capacities decreased with increasing temperatures, indicating that the methyl orange adsorption onto the furfural residue was an exothermic reaction. The maximum adsorption capacity of furfural residue for methyl orange was 54.35 mg/g at 293 K. The isothermal adsorption properties of methyl orange on the furfural residue were more consistent with the Langmuir isotherm model (R2=0.9933), suggesting that the adsorption process of methyl orange by furfural residue was mainly a monolayer adsorption process. (3) The furfural residue exhibited prominent recycling ability. The regenerated furfural residue could effectively adsorb methyl orange during five cycles of adsorption and regeneration. In conclusion, the furfural residue could absorb methyl orange quickly at room temperature and in a wide pH range, and had good reusability. Therefore, the furfural residue would be a low-cost and reusable adsorbent in azo dye wastewater treatment. |
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| Keywords: | furfural residue methyl orange adsorption kinetics isotherms |
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