碳酸酐酶附着膜在微藻直接空气碳捕集中的应用与固碳性能的强化  

Application of Carbonic Anhydrase Membrane in Direct Air Carbon Capture by Microalgae and Enhancement of Carbon Sequestration Performance

作　　者：王睿龙 李明佳 Sandra KENTISH WANG Ruilong;LI Mingjia;Sandra KENTISH(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;MOE Key Laboratory of Thermo-Fluid Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Department of Chemical Engineering,The University of Melbourne,Parkville,Victoria 3010,Australia)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]西安交通大学热流科学与工程教育部重点实验室,西安710049 [3]北京理工大学机械与车辆工程学院,北京100081 [4]墨尔本大学化学工程学院,澳大利亚帕尔维尔,维多利亚州,3010

出　　处：《西安交通大学学报》2024年第9期11-18,共8页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(52293413,52076161)。

摘　　要：为了解决低浓度直接空气碳捕集条件下微藻光生物反应器内CO_(2)传质效率差、溶解度低的问题,采用实验的方法制备了碳酸酐酶(CA)附着的尼龙纤维膜,利用CA催化转化CO_(2)为碳酸氢根的性质,提出了一种可以改善微藻溶液中CO_(2)溶解度及转化率的新型光生物反应器,测试了该反应器放置CA附着尼龙纤维漂浮膜前后的微藻培养和固碳性能,并进一步探究了膜的开孔率及CA附着量对微藻固碳率的影响。实验结果表明:所制备的CA附着的尼龙纤维膜对CO_(2)转化速率提升了62.7%,通过耐久性测试,CA的活性在5个培养周期后仍保持良好,性能衰减仅为11.3%;与传统气石鼓气方式相比,提出的新型光生物反应器的微藻质量浓度提高了29.7%,固碳率提升了65%;随着膜开孔率的增加和透光率的增加,单位CA负载质量的固碳率提高,开孔面积占比24.75%的对照组的单位CA固碳率相比不开孔提高了13%。该研究为进一步提高微藻直接空气捕集的固碳率提供了一种新的方法。To address the challenges of low CO_(2)mass transfer efficiency and solubility in microalgae photobioreactors in direct air carbon capture,this paper employs experimental methods to prepare a nylon fiber membrane coated with carbonic anhydrase(CA).By utilizing CA’s catalytic properties to convert CO_(2)into bicarbonate,a novel photobioreactor is proposed to enhance CO_(2)solubility and conversion rate in microalgae solutions.The reactor’s performance,with and without the CA-coated nylon floating membrane,is evaluated for microalgae cultivation and carbon sequestration.Furthermore,the impact of membrane porosity and CA loading on carbon fixation efficiency is investigated.The experimental results demonstrate that the prepared CA-coated nylon fiber membrane increases the CO_(2)conversion rate by 62.7%.Through durability testing,the CA activity remains robust even after five cultivation cycles,with only an 11.3%decline in performance.Compared to traditional aeration methods,the novel photobioreactor increased microalgae biomass production by 29.7%and carbon sequestration efficiency by 65%.Moreover,an increase in membrane porosity and light transmittance enhances the carbon sequestration efficiency per unit of CA loading,showing a 13%improvement in the carbon fixation rate per unit of CA for the control group with a 24.75%open area ratio compared to the non-porous control.This study provides a novel approach for further enhancing the carbon sequestration efficiency of microalgae in direct air capture.

关 键 词：微藻光生物反应器 直接空气碳捕集 碳酸酐酶 尼龙纤维膜 

分 类 号：TK12[动力工程及工程热物理—工程热物理]