无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2025, Vol. 57 ›› Issue (2): 57-67.doi: 10.19964/j.issn.1006-4990.2024-0407

• 研究与开发 • 上一篇    下一篇

FeS修饰的水化硅酸钙复合材料制备及其总铬移除性能研究

沈晓倩1(), 周斐2, 刘婉晨2, 许露1, 吴俊书2   

  1. 1.华陆工程科技有限责任公司,陕西 西安 710065
    2.北京工业大学,北京 100124
  • 收稿日期:2024-07-15 出版日期:2025-02-10 发布日期:2024-08-09
  • 作者简介:沈晓倩(1984— ),女,硕士,主要研究方向为水处理功能材料与工艺;E-mail:sxq2352@hlet.com
  • 基金资助:
    国家自然科学基金项目(52172290)

Study on synthesis of FeS modified calcium silicate hydrate composites and their total Cr removal performance

SHEN Xiaoqian1(), ZHOU Fei2, LIU Wanchen2, XU Lu1, WU Junshu2   

  1. 1.Hualu Engineering & Technology Co. ,Ltd. ,Xi′an 710065,China
    2.Beijing University of Technology,Beijing 100124,China
  • Received:2024-07-15 Published:2025-02-10 Online:2024-08-09

摘要:

水化硅酸钙(CSH)是一类重要的重金属吸附剂,在环境治理与修复领域扮演着重要的角色。对吸附Fe3+的CSH吸附剂进行功能化创制,可实现重金属Cr(Ⅵ)的还原转化与脱毒。以酸浸工艺提取钢渣滤液为Ca源,Na2SiO3·9H2O为Si源,采用水热法制备出CSH,并以此为基体基于离子交换与静电吸引为主要作用机制吸附Fe3+;随后在引入S源(硫脲)的情况下,将吸附Fe3+的CSH进行水热转化,合成复合功能材料xFeS@CSH(x为Fe3+初始质量浓度,mg/L)。当Fe3+质量浓度为150 mg/L时,150FeS@CSH对Cr(Ⅵ)的还原性能最为优越,当pH=2时,反应4 min后Cr(Ⅵ)(10 mg/L,60 mL)还原转化率可达到100%。同时,通过调控溶液pH与反应时间(pH=3、反应时间为30 min)还可实现Cr(Ⅲ)的固定与总Cr的移除。活性FeS相实现了Cr(Ⅵ)还原,伴随溶液pH的升高,还原产物Cr(Ⅲ)以Cr(OH)3、Cr2O3等形式固定于材料表面。

关键词: 水化硅酸钙, 吸附剂, Cr(Ⅵ)还原, FeS修饰

Abstract:

Calcium silicate hydrate(CSH) is a kind of important heavy metal adsorbent,which plays an important role in both natural self-purification process and artificial environmental purification and restoration.Functionalization of CSH adsorbent for Fe3+ adsorption can achieve reduction and detoxification of heavy metal Cr(Ⅵ).Firstly,CSH was prepared by extracting steel slag filtrate from an acid leaching process as the Ca source and Na2SiO3·9H2O as the Si source.The resulting CSH was used to adsorb Fe3+ metal ions by ion exchange and electrostatic attraction.Subsequently,by using thiourea as S source,the CSH adsorbent loaded by Fe3+ was hydrothermally transformed into xFeS@CSH(x was the initial concentration of Fe3+,mg/L).When the mass concentration of Fe3+ was 150 mg/L,150FeS@CSH sample possessed the best Cr(Ⅵ) reduction property.When pH=2,the reduction conversion rate of Cr(Ⅵ) (10 mg/L,60 mL) could reach 100% after 4 minutes of reaction.Meanwhile,by adjusting the pH of the solution and reaction time(pH=3,reaction time of 30 min),Cr(Ⅲ) fixation and total Cr removal could also be achieved.The active FeS phase achieved Cr(Ⅵ) reduction,and with the increase of solution pH,the reduction product Cr(Ⅲ) was fixed on the material surface in the form of Cr(OH)3,Cr2O3,etc.

Key words: hydrated calcium silicate, adsorbent, Cr(Ⅵ) reduction, FeS modification

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