饱和石灰水涂层对玉米芯炭碳固存能力的影响  

Effect of Saturated Lime Water Coating on Carbon Sequestration Capacity of Corncob Biochar

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作  者:校亮 李文瀚 吴静华 袁国栋 陈思洁 李悦诗 徐青 陈满洪 陈啟林 XIAO Liang;LI Wenhan;WU Jinghua;YUAN Guodong;CHEN Sijie;LI Yueshi;XU Qing;CHEN Manhong;CHEN Qilin(Guangdong Provincial Key Laboratory of Environmental Health and Land Resource/Guangdong Technology and Equipment Research Center for Soil and Water Pollution Control,Zhaoqing University,Zhaoqing Guangdong 526061,China;Guangdong Pute Agricultural Development Co.Ltd.,Zhaoqing Guangdong 526074,China;Guangzhou Gscarbon Technology Co.Ltd.,Guangdong 510630,China)

机构地区:[1]肇庆学院广东省环境健康与资源利用重点实验室/广东省水土污染管控与装备智能制造工程技术研究中心,广东肇庆526061 [2]广东浦特农业发展有限公司,广东肇庆526074 [3]广州绿石碳科技股份有限公司,广州510630

出  处:《西南大学学报(自然科学版)》2024年第3期125-134,共10页Journal of Southwest University(Natural Science Edition)

基  金:广东省基础与应用基础研究基金项目(2022A1515110330);广东省环境健康与资源利用重点实验室项目(2020121201014);2023年广东省普通高校特色创新类项目(2023KTSCX155);肇庆学院“人才特区”项目(2022BSZ005)。

摘  要:生物质炭作为一种富碳多孔材料,具有固碳、培肥和减污等多重功效,目前面临着产量有限和成本昂贵的突出问题.将生物质就地炭化和应用可解决上述问题,而如何实现限氧是其核心.以玉米芯为原材料,通过饱和石灰水涂层包覆实现生物质“自限氧”,以“水-火联动”方法成炭,探讨暴露时间和饱和石灰水涂层对玉米芯在炭化过程中碳固存能力的影响.结果表明:随暴露时间延长,玉米芯炭的碳含量、比表面积及官能团(—COOH和phenolic—OH)含量均逐渐降低,以0 min暴露时间炭的碳转化率最大(45.17%);饱和石灰水涂层下其碳转化率进一步提升至92.60%;涂层包覆壳通过物理阻隔产生的“自限氧”作用及其所含的Ca^(2+)以离子架桥、络合或π电子作用增强了碳截留量.“水-火联动”和饱和石灰水涂层技术的成炭过程为玉米芯在曝氧环境下的“包覆壳限氧-水淬灭”高温热裂解过程.期间,Ca^(2+)或可通过多种方式阻止C=O,O=C—O键断裂生成气体CO_(x)以提高碳截留量并优化碳骨架结构.As a carbon-rich porous material,biochar has multiple functions such as carbon sequestration,fertilization,and pollution abatement.However,the large-scale use of biochar in agricultural production and environmental remediation has been constrained by its low production volume and high cost.If biochar could be produced in the field from local bio-waste for local use,its transportation and storage costs would be eliminated,and its overall price would be significantly decreased,thus making biochar use as a carbon-negative(or carbon sequestration)scheme more feasible.To this end,a key technical challenge to overcome is to create an oxygen-limited carbonization environment in the field to convert biomass to biochar.Here we reported a method to achieve the goal.Corn(Zea mays L.)cob was used as feedstock,and limewater was splashed on the corn cob to form a mineral coating.The coating acted as a barrier to stop oxygen penetration,thus creating an oxygen-limited condition inside the corn cob.Then,the cob was used to produce biochar in the field via aerobic and oxygen-limited carbonization by a fire-water coupled method.A corn cob can be conceived as a small furnace to help explain the carbonization process.The lime-coated outer part of the cob acts as the furnace wall,whereas the inside of the cob is equivalent to the biomass in the furnace.Biochar was formed by igniting corn cob first,letting it burn for a while,and then terminating the combustion with a water mist spray.Two parameters selected from prior studies,exposure time and mineral coating were investigated for their influence on the carbon content and other properties of biochar produced.Exposure time is the duration between burning charcoal falling to the ground and being extinguished by water mist spray.Specifically,with the increase of exposure time,the carbon content,specific surface area,and the contents of functional groups(i.e.,—COOH and phenolic—OH)all decreased,and the carbon conversion rate(i.e.,the percentage of C in corn cob converted to biochar C

关 键 词:碳截留 水-火联动 石灰水 暴露时间 玉米芯 

分 类 号:X5[环境科学与工程—环境工程] S513[农业科学—作物学]

 

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