SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (12): 3117-3125.DOI: 10.1016/j.cjche.2020.07.046

• Energy, Resources and Environmental Technology • Previous Articles     Next Articles

High adsorption of Cd (II) by modification of synthetic zeolites Y, A and mordenite with thiourea

Shaoqing Zhang1, Tianming Lv2, Yang Mu2, Jiqi Zheng2,3, Changgong Meng2   

  1. 1 Anhui Science and Technology University, Bengbu 239000, China;
    2 School of chemical engineering, Dalian University of Technology, Dalian 116024, China;
    3 Department of materials science and engineering, University of Washington, Seattle, WA 98125, USA
  • Received:2020-03-03 Revised:2020-07-04 Online:2021-01-11 Published:2020-12-28
  • Contact: Shaoqing Zhang, Changgong Meng
  • Supported by:
    This work was partially supported by the Talent Foundation of Anhui Science and Technology University (No. HCYJ201901), the Natural Science Foundation of Anhui Province (KJ2020A0055), the National Natural Science Foundation of China (Grant No. 21771030) and the Excellent Talents Program of Anhui Education Department (Nos. gxyq2019062).

High adsorption of Cd (II) by modification of synthetic zeolites Y, A and mordenite with thiourea

Shaoqing Zhang1, Tianming Lv2, Yang Mu2, Jiqi Zheng2,3, Changgong Meng2   

  1. 1 Anhui Science and Technology University, Bengbu 239000, China;
    2 School of chemical engineering, Dalian University of Technology, Dalian 116024, China;
    3 Department of materials science and engineering, University of Washington, Seattle, WA 98125, USA
  • 通讯作者: Shaoqing Zhang, Changgong Meng
  • 基金资助:
    This work was partially supported by the Talent Foundation of Anhui Science and Technology University (No. HCYJ201901), the Natural Science Foundation of Anhui Province (KJ2020A0055), the National Natural Science Foundation of China (Grant No. 21771030) and the Excellent Talents Program of Anhui Education Department (Nos. gxyq2019062).

Abstract: Zeolites Y, A and mordenite (ZY, ZA and ZM) were obtained from diatomite in a template-free system, and the products were modified by thiourea (TU). Characterization studies results indicated that the TU molecules were loaded onto the exterior surfaces of the synthetic zeolites as well as the channels. Elemental analysis and energy-dispersive X-ray spectrometer proved that the TU molecules loaded on to ZA were more than ZY and ZM. Removal of Cd(II) was investigated, and it was found that the modified zeolites have higher removal capacity, modified ZA is especially noticeable. In the adsorption experiments, the effects of various parameters such as sorbent content, contact time, concentration of cadmium solution, pH, selectivity and regeneration were discussed. At the best removal efficiency by modified zeolites, the maximum adsorption capacity is 94.3 mg·g-1, 103.2 mg·g-1 and 89.7 mg·g-1 at 25℃, respectively. The sorbents show good efficiency for the removal of Cd(II) in the presence of different multivalent cations and have good regeneration effect. For the modified samples, removal experiments take place via ion exchange and complexation processes.

Key words: Diatomite, Zeolite, Thiourea, Adsorption, Cd (II) removal

摘要: Zeolites Y, A and mordenite (ZY, ZA and ZM) were obtained from diatomite in a template-free system, and the products were modified by thiourea (TU). Characterization studies results indicated that the TU molecules were loaded onto the exterior surfaces of the synthetic zeolites as well as the channels. Elemental analysis and energy-dispersive X-ray spectrometer proved that the TU molecules loaded on to ZA were more than ZY and ZM. Removal of Cd(II) was investigated, and it was found that the modified zeolites have higher removal capacity, modified ZA is especially noticeable. In the adsorption experiments, the effects of various parameters such as sorbent content, contact time, concentration of cadmium solution, pH, selectivity and regeneration were discussed. At the best removal efficiency by modified zeolites, the maximum adsorption capacity is 94.3 mg·g-1, 103.2 mg·g-1 and 89.7 mg·g-1 at 25℃, respectively. The sorbents show good efficiency for the removal of Cd(II) in the presence of different multivalent cations and have good regeneration effect. For the modified samples, removal experiments take place via ion exchange and complexation processes.

关键词: Diatomite, Zeolite, Thiourea, Adsorption, Cd (II) removal