| 发酵稻壳对亚铁离子和硫离子的吸附-解吸附特性 |
| 摘要点击 2795 全文点击 1146 投稿时间：2015-04-08 修订日期：2015-05-21 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 发酵稻壳 亚铁离子 还原态硫离子 吸附 解吸 |
| 英文关键词 fermented rice husk ferrous ion reduced sulfur ion adsorption desorption |
| 作者 | 单位 | E-mail | | 谢晓梅 | 浙江大学环境与资源学院, 杭州 310058
浙江省亚热带土壤与植物营养重点研究实验室, 杭州 310058 | xiexiaomei@zju.edu.cn | | 廖敏 | 浙江大学环境与资源学院, 杭州 310058
浙江省亚热带土壤与植物营养重点研究实验室, 杭州 310058 | liaomin@zju.edu.cn | | 华嘉媛 | 浙江大学环境与资源学院, 杭州 310058
浙江省亚热带土壤与植物营养重点研究实验室, 杭州 310058 | | | 陈娜 | 浙江大学环境与资源学院, 杭州 310058
浙江省亚热带土壤与植物营养重点研究实验室, 杭州 310058 | | | 张楠 | 浙江大学环境与资源学院, 杭州 310058
浙江省亚热带土壤与植物营养重点研究实验室, 杭州 310058 | | | 徐培智 | 广东省农业科学院土壤肥料研究所, 广州 510640 | | | 解开治 | 广东省农业科学院土壤肥料研究所, 广州 510640 | | | 徐昌旭 | 江西省农业科学院土壤肥料与资源环境研究所, 南昌 330200 | | | 刘光荣 | 江西省农业科学院土壤肥料与资源环境研究所, 南昌 330200 | |
|
| 中文摘要 |
| 为了解发酵稻壳对Fe2+和S2-离子的固定潜力,采用静态批式法研究了发酵稻壳对Fe2+和S2-离子的吸附行为,探讨了反应时间、溶液中Fe2+和S2-浓度、溶液pH、吸附反应环境温度及溶液离子强度对发酵稻壳吸附Fe2+和S2-特性的影响,并进一步通过解吸附试验了解发酵稻壳吸附态Fe2+和S2-的稳定性. 结果表明,发酵稻壳吸附Fe2+(r=0.9121)和S2-(r=0.9011)的动力学过程均符合Elovich动力学模型, 且Fe2+(R2=0.9651)和S2-(R2=0.9366) 的等温吸附特征可较好地用Freundlich等温吸附模型描述. 发酵稻壳对Fe2+和S2-的吸附为非优惠型吸附,其中对Fe2+的吸附为非自发反应,对S2-的吸附为自发反应. 发酵稻壳对Fe2+和S2-的吸附过程是一吸热过程,升温有利于吸附作用的进行,发酵稻壳对Fe2+的吸附主要为配位吸附,而对S2-的吸附主要为阴离子交换吸附. 一定pH范围内(1.50~11.50)发酵稻壳吸附Fe2+和S2-具有较强的适应性. 同时随着离子强度的增加发酵稻壳对Fe2+的吸附量有所增加,而对S2-的吸附量略有减少,进一步证明发酵稻壳对Fe2+的吸附以内层配位为主,对S2-的吸附以外层络合为主. 此外,不同pH条件及离子强度下发酵稻壳吸附的Fe2+和S2-解吸率很低,解吸率均小于10.00%. 上述结果说明,发酵稻壳对Fe2+和S2-具有较好的吸附能力和环境适应性,吸附态Fe2+和S2-稳定性好,不易再释放. |
| 英文摘要 |
| To understand the potential of rice husk to fix Fe2+ and S2- ions, the sorption of Fe2+ and S2- by fermented rice husk was studied by using batch incubation experiments in the present study.The effects of adsorption time, Fe2+ and S2- concentration, pH, the temperature and ionic strength in adsorption reaction solution on the sorption were investigated.Therefore, the stability of Fe2+ and S2- adsorbed by fermented rice husk was further validated by desorption experiments performed under similar conditions as adsorption.The results showed that, the adsorption kinetics of Fe2+ (r=0.9121) and S2- (r=0.9011) by fermented rice husk fits the Elovich kinetics equation, and Freundlich isotherm model could simulate the isotherm adsorption processes of Fe2+ (R2=0.9651) and S2- (R2=0.9366) on fermented rice husk was better than other models.The adsorption processes on fermented rice husk were non-preferential adsorption for Fe2+ and S2, while the adsorption process of Fe2+ on fermented rice husk was spontaneous reaction and the adsorption process of S2- was non-spontaneous reaction.The adsorption processes of Fe2+ and S2- on fermented rice husk were endothermic process since high temperature could benefit to the adsorption.The adsorption mechanism of Fe2+ on fermented rice husk was mainly controlled by coordination adsorption, the adsorption mechanism of S2- on fermented rice husk was mainly controlled by ligand exchange adsorption.The adsorption processes of Fe2+ and S2- on fermented rice husk showed greater pH adaptability which ranged from 1.50 to 11.50.With the increasing of ionic strength, the amount of adsorbed Fe2+ on fermented rice husk wasincreased in some extent, the amount of adsorbed S2- on fermented rice husk was slightly decreased, which further proved the adsorption of Fe2+ was major in inner sphere complexation and the adsorption of S2- was major in outer complexation.The desorption rates of Fe2+ and S2- which was adsorbed by fermented rice husk were lower in different pH or ionic strength conditions, the desorption rates were all below 10 percentage which proved that the adsorption stabilities of Fe2+ and S2- on fermented rice husk were superior.The above results indicated that, the adsorption abilities to Fe2+ and S2- on fermented rice husk were better and had greater environmental adaptability.The Fe2+ and S2- adsorbed by fermented rice husk showed higher stability, and were not easy to release again. |
|
|
|
