| 3种新型改性玉米秸秆生物炭对Cd2+吸附特性的比较 |
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| 引用本文： | 陈欣洁,叶燕清,杨浙湘,黄兴洲,周曦,张温尔,李荭荭.3种新型改性玉米秸秆生物炭对Cd2+吸附特性的比较[J].安徽农业大学学报,2023,50(6):1006. |
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| 作者姓名： | 陈欣洁 叶燕清 杨浙湘 黄兴洲 周曦 张温尔 李荭荭 |
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| 作者单位： | 闽南师范大学历史地理学院，漳州 363000;闽南师范大学历史地理学院，漳州 363000; 福建农林大学资源与环境学院，福州 350002 |
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| 基金项目： | 福建省自然科学基金（2021J05200）资助。 |
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| 摘 要： | 为比较3种新型改性生物炭对溶液中镉（Cd）的吸附行为，以玉米秸秆生物炭为原料，制备巯基改性生物炭（S-BC）、铁改性生物炭（Fe-BC）和氮掺杂生物炭（N-BC），分析改性前后生物炭的元素组成、比表面积、表面官能团等性质的变化，通过系统的吸附试验，比较3种改性生物炭对Cd的吸附性能和作用机理。结果表明：与未改性生物炭（BC）相比，N-BC和Fe-BC比表面积分别增加了6.3和9.0倍，总孔体积分别增加了2.68和4.08倍。S-BC因改性后表面光滑，使得生物炭比表面积减小，但其表面官能团变化明显，S-BC在2 977 cm-1处出现新的吸收峰对应脂肪族（C-H）的伸缩振动，而且在1 089 cm-1、1 044 cm-1位置出现双特征吸收峰。3种生物炭对Cd2+的吸附主要为化学吸附过程为主，且Langmuir吸附等温线模型所拟合的热力学吸附优于Freundlich吸附等温模型，推测N-BC、Fe-BC、S-BC 3种生物炭对Cd2+的吸附过程为单分子层物理吸附。通过Langmuir模型计算可以得到几种生物炭对Cd2+最大吸附量表现为Fe-BC (69.11 mg·g-1) > N-BC (61.92 mg·g-1) > S-BC (53.85 mg·g-1) > BC (40.34 mg·g-1)。
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| 关 键 词： | 巯基改性生物炭 铁改性生物炭 微纳米含氮生物炭 镉 吸附行为 |
Comparison of the cadmium adsorption characteristics of three types of new modified corn straw biochars |
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| CHEN Xinjie,YE Yanqing,YANG Zhexiang,HUANG Xingzhou,ZHOU Xi,ZHANG Wener,LI Honghong.Comparison of the cadmium adsorption characteristics of three types of new modified corn straw biochars[J].Journal of Anhui Agricultural University,2023,50(6):1006. |
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| Authors: | CHEN Xinjie YE Yanqing YANG Zhexiang HUANG Xingzhou ZHOU Xi ZHANG Wener LI Honghong |
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| Institution: | School of History and Geography, Minnan Normal University, Zhangzhou 363000; School of History and Geography, Minnan Normal University, Zhangzhou 363000; College of Resources and Environment, Fujian Agricultural and Forestry University, Fuzhou 350002 |
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| Abstract: | In order to explore the adsorption behavior of Cd2+ onto three types of new modified biochars, named as thiol-modified biochar (S-BC), FeSO4/FeCl3 modified biochar (Fe-BC) and nitrogen-containing biochar (N-BC), which were prepared from corn straw biochar (BC), the changes in the elemental composition, specific surface area, surface functional groups and microstructure of the biochars before and after the modification were examined. Through laboratory-based adsorption experiments, the adsorption properties and mechanism of the modified biochar for Cd2+ were compared. The results showed that compared with the unmodified biochar(BC), the specific surface area of N-BC and Fe-BC was increased by 6.3 and 9.0 times, respectively, and the total pore volume was increased by 2.68 and 4.08 times, respectively. Due to the smooth surface of S-BC, the specific surface area of S-BC was at a lower level than that of BC, while its surface functional groups changed significantly. Fourier transform infrared spectroscopy (FTIR) analysis revealed that a new absorption peak of S-BC was found at 2 977 cm-1, and a double characteristic absorption peak appeared at 1 089 cm-1 and 1 044 cm-1. The adsorptive removal of Cd2+ by the three modified biochars could be better simulated with the Langmuir adsorption isotherm model than the Freundlich adsorption isotherm model, suggesting a chemisorption process might participated in the Cd2+ removal. In addition, Langmuir, the monolayer adsorption model, was better to explain the mechanism of Cd2+ removal by the biochars. The maximum adsorption capacity of these biochars to Cd2+ was listed in the order: Fe-BC (69.11 mg·g-1) > N-BC (61.92 mg·g-1) > S-BC (53.85 mg·g-1) > BC (40.34 mg·g-1). |
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| Keywords: | thiol-modified biochar FeSO4/FeCl3 modified biochar micro-nano-engineered nitrogenous biochar cadmium adsorption |
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