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

doi:10.1016/j.cjche.2020.07.046

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (12): 3117-3125.DOI: 10.1016/j.cjche.2020.07.046

• Energy, Resources and Environmental Technology • 上一篇下一篇

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

Shaoqing Zhang¹, Tianming Lv², Yang Mu², Jiqi Zheng^2,3, Changgong Meng²

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

收稿日期:2020-03-03 修回日期:2020-07-04 出版日期:2020-12-28 发布日期:2021-01-11
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).

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

Shaoqing Zhang¹, Tianming Lv², Yang Mu², Jiqi Zheng^2,3, Changgong Meng²

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:2020-12-28 Published:2021-01-11
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).

摘要/Abstract

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

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

Shaoqing Zhang, Tianming Lv, Yang Mu, Jiqi Zheng, Changgong Meng. High adsorption of Cd (II) by modification of synthetic zeolites Y, A and mordenite with thiourea[J]. 中国化学工程学报, 2020, 28(12): 3117-3125.

Shaoqing Zhang, Tianming Lv, Yang Mu, Jiqi Zheng, Changgong Meng. High adsorption of Cd (II) by modification of synthetic zeolites Y, A and mordenite with thiourea[J]. Chinese Journal of Chemical Engineering, 2020, 28(12): 3117-3125.

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

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

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