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论文类型：期刊论文

发表时间：2019-02-01

发表刊物：MATERIALS LETTERS

收录刊物：SCIE、Scopus

卷号：236

页面范围：233-235

ISSN号：0167-577X

关键字：Diatomite; Zeolite X; Thiourea; Surfaces; Adsorption; Functional

摘要：Zeolite X (ZX) was synthesized by diatomite in a water system, and then the synthetic zeolite was modified by thiourea (TU). The synthetic and modified ZX were characterized by XRD, FT-IR, TG/DTA, elemental analysis (CHNS), FE-SEM, EDX, elemental mapping and N-2 adsorption/desorption isotherms, respectively. All the results confirmed that the TU molecules were loaded onto both the exterior and interior surfaces of ZX during the modification process. Compared to the raw ZX, the modified ZX has a higher removal capacity in the Cd(II) removal experiments. In ZX-TU sample, removal of Cd(II) takes place via ion exchange and complexation processes. The maximum adsorption capacity is 92.47 mg/g at 25 degrees C. This cost-effective zeolite can be a functional material for heavy metal removal. (C) 2018 Elsevier B.V. All rights reserved.