| 马凯悦,张浩,宋宁宁,王芳丽,林大松.氧化老化玉米秸秆生物炭吸附镉机理研究[J].农业环境科学学报,2022,41(6):1230-1240. |
| 氧化老化玉米秸秆生物炭吸附镉机理研究 |
| Mechanism of cadmium adsorption by oxidative aging corn straw biochar |
| 投稿时间：2021-11-06 修订日期：2022-03-09 |
| DOI：10.11654/jaes.2021-1282 |
| 中文关键词: 生物炭 玉米秸秆 老化 吸附机理 Cd |
| 英文关键词: biochar corn straw aging adsorption mechanism cadmium |
| 基金项目:国家自然科学基金项目(41877403) |
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| 摘要点击次数: 1483 |
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| 中文摘要: |
| 为研究玉米秸秆生物炭在经过模拟自然界老化后对Cd2+的吸附响应，本文利用H2O2对玉米秸秆生物炭进行氧化老化1、2、3次，利用元素分析仪、扫描电镜、红外光谱及碳谱等分析方法，分析老化前后生物炭对Cd2+的吸附及响应机理。结果表明：玉米秸秆生物炭氧化老化过程中形成硅酸盐沉淀；经过H2O2老化后H/C、O/C和（O+N）/C的原子比逐渐升高，使得生物炭含氧官能团上升、芳香性减弱、极性增强；老化1次（OYM1）、2次（OYM2）、3次（OYM3）后玉米秸秆生物炭碱性元素逐步被释放，碱性元素较未氧化玉米秸秆生物炭（YM）分别降低了48.23%、95.04%、95.74%；不同处理生物炭对Cd2+的最大吸附量表现为： YM（12.42 mg·g-1） >OYM1（5.98 mg·g-1） >OYM3（3.88 mg·g-1） >OYM2（3.61 mg·g-1），说明老化作用抑制了其对Cd2+的吸附。在玉米秸秆生物炭长期利用过程中，生物炭的老化促进无机组分发挥作用，吸附性能减弱，在进行土壤及水污染修复时应合理使用。 |
| 英文摘要: |
| To study the adsorption response of corn straw biochar to Cd2+ after simulated natural aging, corn straw biochar was oxidized and aged for 1, 2, and 3 times using H2O2. The adsorption and response mechanism of Cd2+ by biochar before and after aging were analyzed using elemental analyzer, scanning electron microscope, infrared spectrum, and carbon spectrum. The results showed that silicate precipitation was formed during the oxidative aging of corn straw biochar. After H2O2 aging, the atomic ratios of H/C, O/C, and(O+N)/C gradually increased, resulting in the increase of oxygen-containing functional groups, weakening of aromaticity and enhancement of polarity of biochar. After aging for 1, 2, and 3 times, the alkaline elements of corn straw biochar OYM1, OYM2, and OYM3 were released, and the alkaline elements were reduced by 48.23%, 95.04%, and 95.74%, respectively compared with the unaged corn straw biochar (YM). The maximum adsorption capacity of aged corn straw biochar for Cd2+ was in the order as follows:YM(12.42 mg·g-1) >OYM1(5.98 mg·g-1) >OYM3(3.88 mg·g-1) >OYM2(3.61 mg·g-1), indicating that aging inhibits its adsorption of Cd2+. Long-term usage of corn straw biochar may probably promote the role of inorganic components and weaken its adsorption performance; therefore, it should be used reasonably in the remediation of soil and water pollution. |
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