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  

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

作　　者：沈晓倩 周斐 刘婉晨 许露 吴俊书[2] SHEN Xiaoqian;ZHOU Fei;LIU Wanchen;XU Lu;WU Junshu(Hualu Engineering&Technology Co.,Ltd.,Xi′an 710065,China;Beijing University of Technology,Beijing 100124,China)

机构地区：[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

出　　处：《无机盐工业》2025年第2期57-67,共11页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(52172290)。

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Fe^(3+)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,Na_(2)SiO_(3)·9H_(2)O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Fe^(3+);随后在引入S源(硫脲)的情况下,将吸附Fe^(3+)的CSH进行水热转化,合成复合功能材料xFeS@CSH(x为Fe^(3+)初始质量浓度,mg/L)。当Fe^(3+)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)、Cr_(2)O_(3)等形式固定于材料表面。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 ad-sorbent for Fe^(3+)adsorption can achieve reduction and detoxification of heavy metal Cr(Ⅵ).Firstly,CSH was prepared by ex-tracting steel slag filtrate from an acid leaching process as the Ca source and Na_(2)SiO_(3)·9H_(2)O as the Si source.The resulting CSH was used to adsorb Fe^(3+)metal ions by ion exchange and electrostatic attraction.Subsequently,by using thiourea as S source,the CSH adsorbent loaded by Fe^(3+)was hydrothermally transformed into xFeS@CSH(x was the initial concentration of Fe^(3+),mg/L).When the mass concentration of Fe^(3+)was 150 mg/L,150FeS@CSH sample possessed the best Cr(Ⅵ)reduc-tion 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 solu-tion pH,the reduction product Cr(Ⅲ)was fixed on the material surface in the form of Cr(OH)_(3),Cr_(2)O_(3),etc.

关 键 词：水化硅酸钙 吸附剂 Cr(Ⅵ)还原 FeS修饰 

分 类 号：O614.61[理学—无机化学]