| 周红卫,陈振焱,胡超,张亚平,顾东清.CO2-N2气氛下热解工艺对稻秆生物炭吸附Cd2+的影响[J].农业环境科学学报,2020,39(7):1605-1612. |
| CO2-N2气氛下热解工艺对稻秆生物炭吸附Cd2+的影响 |
| Effects of pyrolysis processes under CO2-N2 atmosphere on Cd2+ adsorption by rice straw biochar |
| 投稿时间：2019-12-21 |
| DOI：10.11654/jaes.2019-1406 |
| 中文关键词: 生物炭 热解 CO2-N2气氛 水稻秸秆 镉 |
| 英文关键词: biochar pyrolysis CO2-N2 atmosphere rice straw cadmium |
| 基金项目:国家重点研发计划项目（2018YFD0800304） |
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| 摘要点击次数: 1871 |
| 全文下载次数: 1458 |
| 中文摘要: |
| 为了获得对镉离子（Cd2+）具有高吸附性能的水稻秸秆生物炭，研究了热解温度、停留时间、升温速率和反应气氛对生物炭特性的影响。以CO2-N2为反应气氛，确定了混合气氛中CO2的比例以及与CO2-N2气氛相匹配的整套热解工艺参数。通过pH、红外光谱（FTIR）和比表面积（BET）等表征手段并结合吸附实验确定了生物炭的性质。结果表明，向反应气氛中添加CO2可使得生物炭具有良好的多孔结构，同时在其表面引入了较多含氧官能团。综合考虑Cd2+的去除率、生物炭产率和成本等影响因素，最终确定了最合理的CO2比率为0.5，与该CO2-N2气氛相匹配的其他参数分别为热解温度800℃、停留时间1 h、升温速率10℃·min-1。在该最佳热解工艺下制备的生物炭，对初始浓度为250 mg·L-1的Cd2+溶液去除率高达96.6%，表明该方法能将农业废弃生物质转化为高附加值产品，并用于处理废水中的Cd。 |
| 英文摘要: |
| The physicochemical and adsorption properties of biochar depend widely on its processing conditions. To find the pyrolysis conditions suitable for converting rice straw into high efficient biochar for cadmium adsorption, the effects of pyrolysis temperature, resident time, heating rate, and reaction atmosphere on biochar's characteristics were studied. The ratio of CO2 in the mixed atmosphere and the complete set of pyrolysis condition parameters matching it were determined based on a reaction atmosphere of CO2-N2. The properties of biochar were determined by several characterizations such as pH value, Fourier-transform infrared(FTIR)spectroscopy, and BrunauerEmmett-Teller(BET)analysis as well as adsorption experiments. The results showed that the addition of CO2 into a reaction atmosphere significantly affected a well-developed porous structure and introduced oxygen-containing functional groups onto the surface. After comprehensively considering the influencing factors of Cd2+ removal efficiency, biochar yield, and cost, the most reasonable ratio of CO2 was finally determined to be 0.5. Other parameters matching the CO2-N2 atmosphere were:a pyrolysis temperature of 800℃, resident time of 1 h, and heating rate of 10℃·min-1, respectively. The biochar prepared in the optimal pyrolysis conditions had a high removal efficiency of Cd2+ of up to 96.6% from the initial 250 mg·L-1 Cd2+ concentration solution, indicating that this method could convert agricultural waste biomass into high value-added products to deal with cadmium in wastewater. |
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