| 梁东旭,罗春燕,周鑫,陈红春,程雨薇,邓仕槐.改性小麦壳对水溶液中Cd2+的吸附研究[J].农业环境科学学报,2015,34(12):2364-2371. |
| 改性小麦壳对水溶液中Cd2+的吸附研究 |
| Adsorption of Cd2+ from Aqueous Solution by Modified Wheat Chaff |
| 投稿时间：2015-06-07 |
| DOI：10.11654/jaes.2015.12.016 |
| 中文关键词: 小麦壳 高锰酸钾 改性 吸附 镉 影响因素 |
| 英文关键词: wheat chaff KMnO4 modification adsorption cadmium influencing factors |
| 基金项目:四川省青年创新团队项目(2014TD0019);教育部长江学者和创新团队发展计划(IRT13083);四川省科技支撑计划(2011NZ0061) |
| 作者 | 单位 | E-mail | | 梁东旭 | 四川农业大学环境学院, 四川省农村环境工程技术中心, 成都 611130 | | | 罗春燕 | 四川农业大学环境学院, 四川省农村环境工程技术中心, 成都 611130 | | | 周鑫 | 四川农业大学环境学院, 四川省农村环境工程技术中心, 成都 611130 | | | 陈红春 | 四川农业大学环境学院, 四川省农村环境工程技术中心, 成都 611130 | | | 程雨薇 | 四川农业大学环境学院, 四川省农村环境工程技术中心, 成都 611130 | | | 邓仕槐 | 四川农业大学环境学院, 四川省农村环境工程技术中心, 成都 611130 | shdeng8888@163.com |
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| 中文摘要: |
| 利用氢氧化钠和高锰酸钾对农业废弃物小麦壳进行联合改性,研究小麦壳改性前后对废水中重金属Cd2+的吸附性能和吸附剂用量、初始pH、温度、接触反应时间、共存离子等因素对吸附的影响。结果表明:NaOH-KMnO4联合改性小麦壳平衡吸附量比原始小麦壳增大了9.30倍,理论最大吸附量可达26.74 mg·g-1;在室温下,当投加浓度为2.0 g·L-1,溶液pH值在5.0~8.0之间时,吸附效果最优,但溶液中有Na+或Ca2+存在时不利于吸附反应进行;吸附量随温度的升高而增大,吸附在1 h内可达到动态平衡,该过程符合准二级动力学方程,且Langmuir等温吸附模型能更好地拟合改性小麦壳材料对溶液中Cd2+的吸附。研究表明,小麦壳改性后表面结构发生了明显变化,吸附性能显着提升,改性小麦壳对废水中的Cd2+具有明显的去除效果,为农业废弃物“变废为宝”提供了一条新途径。 |
| 英文摘要: |
| As an agricultural waste, wheat chaff was modified with NaOH and KMnO4 solution, and used for removing Cd2+ from aqueous solution. Cadmium adsorption and its influencing factors, including rate, pH, temperature, time and coexisting ions, were investigated. The surface characteristics of wheat chaff was obviously modified by NaOH and KMnO4, thus promoting adsorption. The adsorption capacity of the modified wheat chaff increased by 9.30 times, as compared with original wheat chaff. The maximum adsorption capacity was up to 26.74 mg·g-1. The optimized adsorption conditions were 2.0 g·L-1 wheat chaff, pH 5.0~8.0, and temperature 25 ℃。 However, the presence of Na+ and Ca2+ exhibited a negative effect on Cd2+ adsorption. In addition, adsorption capacity increased along with increases in temperature. The adsorption equilibrium achieved within 60 min. The kinetics of adsorption was well described by the second-order kinetic adsorption model, while Langmuir model better fit the adsorption isotherms. The present results indicate that modification of wheat chaff with NaOH and KMnO4 not only produces an excellent agent for Cd2+ removal, but also offers a new way for recycling agricultural residues. |
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