PDF《糠醛渣对水中甲基橙的吸附性能》

第32 卷第3期2019 年3月环境科学研究Research of Environmental Sciences Vol.

32?No.3 Mar.?2019 收稿日期: 2018~03~15 修订日期: 2018~09~18 作者简介: 张霞(1969~)?女?宁夏银川人?副教授?硕士?主要从事生物质资源利用及水处理研究?zhang_x@ nxu.edu.cn. 基金项目: 宁夏回族自治区自然科学基金项目(No.NZ16039) Supported by Natural Science Foundation of Ningxia Hui Autonmous Region? China(No.NZ16039) 糠醛渣对水中甲基橙的吸附性能 张霞? 陈小燕? 刘奎发? 刘万毅 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 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 mgML 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 mgMg? 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 molML 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. 关键词: 糠醛渣? 甲基橙? 吸附? 吸附动力学? 吸附等温线 中图分类号: X703? X705 文章编号: 1001~6929(2019)03~0507~06 文献标志码: A DOI: 10? 13198Mj? issn? 1001~6929? 2018? 11?

09 Adsorption of Methyl Orange by Furfural Residue ZHANG Xia? CHEN Xiaoyan? LIU Kuifa? LIU Wanyi State Key Laboratory of High~Efficiency Coal Utilization and Green Chemical Engineering? School of Chemistry and Chemical Engineering? Ningxia University? Yinchuan 750021? China 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