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。

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.