Journal of South China University of Technology(Natural Science) >

2025 , Vol. 53 >Issue 3: 139 - 148

DOI: https://doi.org/10.12141/j.issn.1000-565X.240417

Chemistry & Chemical Engineering

Preparation and CO2 Adsorption Performance of Ca-LTA Zeolite Derived From Titanium-Containing Slag

  • HUANGFU Lin ,
  • HE Zhengqing ,
  • ZHAO Shimin ,
  • ZHOU Xintao ,
  • LUO Zhongqiu ,
  • ZU Yun ,
  • SHANG Bo ,
  • LI Fangyuan
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  • 1.State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization，Panzhihua 617000，Sichuan，China
    2.Yunnan Institute of Environmental Science Research，Kunming 650034，Yunnan，China
    3.Faculty of Chemical Engineering，Kunming University of Science and Technology，Kunming 650500，Yunnan，China
皇甫林（1992—），男，博士，工程师，主要从事CO2捕集及转化研究。E-mail： l_huangfu@163.com

Received date: 2024-08-23

  Online published: 2024-10-08

Supported by

the Open Project of State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization(2022P4FZG03A);the Basic Research Planning Program of Yunnan Province(202401AT070384)

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Abstract

LTA-type zeolites is considered a highly promising CO2 capture material due to their excellent pore structures and high selectivity for CO2 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 CO2 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 CO2 capture capacity, but also exhibits excellent selectivity in CO2/N2 and CO2/CH4 separation processes, with the 0.05Ca-LTA sample demonstrating the most outstanding adsorption performance. Under conditions of 25 ℃ and 105 Pa, the CO2 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 CO2 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 CO2 capture and environmental pollution control.

Key words： titanium-containing slag; Na-LTA zeolite; calcium ion exchange; CO2 capture; adsorption mechanism

Cite this article

HUANGFU Lin , HE Zhengqing , ZHAO Shimin , ZHOU Xintao , LUO Zhongqiu , ZU Yun , SHANG Bo , LI Fangyuan . Preparation and CO2 Adsorption Performance of Ca-LTA Zeolite Derived From Titanium-Containing Slag[J]. Journal of South China University of Technology(Natural Science), 2025 , 53(3) : 139 -148 . DOI: 10.12141/j.issn.1000-565X.240417

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