含钛渣制备Ca-LTA沸石及其CO_(2)吸附性能  

Preparation and CO_(2)Adsorption Performance of Ca-LTA Zeolite Derived From Titanium-Containing Slag

作　　者：皇甫林 贺政卿 赵世民 周新涛[3] 罗中秋[3] 祖运 尚波 李方园 HUANGFU Lin;HE Zhengqing;ZHAO Shimin;ZHOU Xintao;LUO Zhongqiu;ZU Yun;SHANG Bo;LI Fangyuan(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China;Yunnan Institute of Environmental Science Research,Kunming 650034,Yunnan,China;Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,Yunnan,China)

机构地区：[1]钒钛资源综合利用国家重点实验室,四川攀枝花617000 [2]云南省生态环境科学研究院,云南昆明650034 [3]昆明理工大学化学工程学院,云南昆明650500

出　　处：《华南理工大学学报(自然科学版)》2025年第3期139-148,共10页Journal of South China University of Technology(Natural Science Edition)

基　　金：钒钛资源综合利用国家重点实验室开放课题(2022P4FZG03A);云南省科技厅昆明理工大学“双一流”创建联合专项(202101BE070001-031);昆明理工大学分析测试基金项目(2022T20160009);云南省基础研究计划项目(202401AT070384)。

摘　　要：LTA沸石因其优异的孔隙结构和较高的CO_(2)吸附选择性,被认为是极具潜力的CO_(2)捕获材料。该文提出了一种以工业固废含钛渣为原料的绿色可持续合成策略,先制备Na-LTA沸石母体,再通过常规液相离子交换法(LPIE)调控钙负载量,制备出x Ca-LTA沸石系列,以提升其CO_(2)吸附性能;然后通过动态吸附法对样品的吸附性能进行评价。实验结果表明:x Ca-LTA沸石不仅显著提高了CO_(2)的捕集能力,还在CO_(2)/N_(2)和CO_(2)/CH_(4)分离过程中表现出优异的选择性,尤其是0.05Ca-LTA样品的吸附性能最为突出;在25℃、10~5 Pa条件下,0.05Ca-LTA的CO_(2)吸附速率为Na-LTA的4.95倍,最大吸附容量达到4.02 mmol/g。动力学分析结果表明:0.05Ca-LTA对CO_(2)的吸附行为符合拟二级动力学模型,吸附过程由物理吸附和化学吸附协同主导,这种协同作用不仅加快了吸附速率,还提高了吸附效率;经过5次吸附/脱附循环后,0.05Ca-LTA仍保持高效稳定的吸附性能,展现了优异的循环再生能力。该研究遵循“以废治废”的环保理念,不仅为固废的高值化利用提供了新路径,也为CO_(2)捕集与环境污染治理的协同优化提供了重要的理论参考和应用潜力。LTA-type zeolites is considered a highly promising CO_(2)capture material due to their excellent pore structures and high selectivity for CO_(2)adsorption.This study presented a green and sustainable synthesis approach using industrial titanium-containing slag waste as a raw material to prepare Na-LTA zeolite precursors.Calcium loading was adjusted via a conventional liquid-phase ion exchange(LPIE)method to produce a series of xCa-LTA zeolites,specifically designed to enhance CO_(2)adsorption performance.The adsorption properties of the xCa-LTA zeolites were systematically evaluated through dynamic adsorption experiments.Results show that xCa-LTA zeolites not only significantly enhances CO_(2)capture capacity,but also exhibits excellent selectivity in CO_(2)/N_(2)and CO_(2)/CH_(4)separation processes,with the 0.05Ca-LTA sample demonstrating the most outstanding adsorption performance.Under conditions of 25℃and 105 Pa,the CO_(2)adsorption rate of 0.05Ca-LTA is 4.95 times that of Na-LTA,with a maximum adsorption capacity of 4.02 mmol/g.Kinetic analysis indicates that the CO_(2)adsorption behavior of 0.05Ca-LTA follows a pseudo-second-order kinetic model,where the adsorption process is synergistically dominated by both physisorption and chemisorption.This synergy not only accelerated adsorption rates but also improved overall efficiency.After five adsorption/desorption cycles,0.05Ca-LTA maintains highly efficient and stable adsorption performance,demonstrating excellent cyclic regeneration capability.This study follows the ecofriendly concept of“treating waste with waste”providing a new approach for the high-value utilization of solid waste while offering important theoretical and application potential for the synergistic optimization of CO_(2)capture and environmental pollution control.

关 键 词：含钛渣 LTA沸石 钙离子交换 CO_(2)捕集 吸附机理 

分 类 号：X701[环境科学与工程—环境工程]