| 仇祯,周欣彤,韩卉,张秋卓.互花米草生物炭的理化特性及其对镉的吸附效应[J].农业环境科学学报,2018,37(1):172-178. |
| 互花米草生物炭的理化特性及其对镉的吸附效应 |
| Properties of Spartina alterniflora Loisel. derived-biochar and its effect on cadmium adsorption |
| 投稿时间：2017-06-07 |
| DOI：10.11654/jaes.2017-0810 |
| 中文关键词: 互花米草 生物炭 镉 吸附 |
| 英文关键词: Spartina alterniflora Loisel. biochar cadmium adsorption |
| 基金项目:国家自然科学基金项目（31400513）；上海市科委长三角科技联合公关项目（17295810600）；上海市城市化生态过程与生态恢复重点实验室开放课题（SHUES2016B01） |
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| 中文摘要: |
| 为确定制备互花米草生物炭的最优热解温度，并了解其对镉的吸附特性，以崇明东滩入侵种互花米草为原料，分析了不同热解温度下生物炭的稳定性、基本理化特性及其对镉的吸附能力，通过吸附动力学拟合、扫描电镜、红外光谱，研究互花米草生物炭对镉吸附特性及吸附前后生物炭的形貌及结构变化。结果表明，450℃热解15 min时制备的生物炭可达吸附平衡，吸附量最大为20.576 mg·g-1。互花米草生物炭对镉的吸附满足二级动力学方程式，以化学吸附为主。电镜扫描镉吸附后互花米草生物炭发现粒状突起，红外光谱显示羟基、羧基等含氧官能团发生较大变动。由此可见，450℃制备的互花米草生物炭具有良好镉吸附效应，羟基、羧基等含氧官能团对生物炭吸附镉发挥主要作用，部分镉在生物炭表面发生表层吸附，且可能形成Cd2+复合体。 |
| 英文摘要: |
| Heavy-metal contamination is an important environmental problem due to the accumulation of toxic metals in humans via the food chain. In recent years, biochar has emerged as an efficient tool for the removal of heavy metals with advantages over other biomaterials. In this study, Spartina alterniflora Loisel.,which is an alien invasive species and grows in Dongtan wetland, Chongming, Shanghai, was used to produce biochar. The optimum temperature for biochar production was selected based on basic properties, adsorption ability for cadmium, and stability at different pyrolysis temperatures. A scanning electron microscope(SEM) and fourier transform infrared spectroscopy(FTIR) were used to observe morphology and to analyze different functional groups involved in cadmium adsorption of prepared biochar, respectively. The results showed that the Cd2+ absorption capacity of biochar prepared at 450℃ was up to 20.576 mg·g-1 in only 15 min. The adsorption of cadmium by biochar followed the second order kinetic equation, and chemical adsorption was the main adsorption pattern. SEM images showed granular protrusions of cadmium adsorption in Spartina alterniflora biochar, while FTIR revealed remarkable changes in hydroxyl, carboxyl, and other oxygen-containing functional groups in the cadmium adsorbed by biochar. It was also possible that adsorption of cadmium occurred on the surface of biochar due to the formation of a cadmium-biochar compound system. These results demonstrated that Spartina alterniflora biochar is effective for metals adsorption. |
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