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

doi:10.19964/j.issn.1006-4990.2024-0407

Abstract

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

CLC Number:

O614.61

SHEN Xiaoqian, ZHOU Fei, LIU Wanchen, XU Lu, WU Junshu. Study on synthesis of FeS modified calcium silicate hydrate composites and their total Cr removal performance[J]. Inorganic Chemicals Industry, 2025, 57(2): 57-67.

Figures/Tables 12

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References 30

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样品名称	合成条件
xFe³⁺@CSH	CSH在质量浓度为x mg/L的Fe³⁺溶液（60 mL）中吸附2 h所得样品
xFe@CSH	将xFe³⁺@CSH与NaOH在140 ℃条件下进行水热反应所得样品
S@CSH	以CH₄N₂S为S源、NaOH为活化剂，在140 ℃下水热处理CSH粉体所得样品
xFeS@CSH	以CH₄N₂S为S源、NaOH为活化剂，在140 ℃下水热处理xFe³⁺@CSH粉体所得样品

材料	元素原子数分数/%
材料	O	Si	Ca	Fe	S	Cr
150FeS@CSH	63.67	20.03	1.02	11.66	3.62	—
150FeS@CSH（BR pH=2）	66.53	24.13	0.12	6.74	0.33	2.15
150FeS@CSH（BR pH=3）	68.28	15.22	0.18	10.88	0.88	4.56

材料	反应条件	Cr（Ⅵ）还原去除率	总Cr移除率/%	附加条件
Leonardite^［23］	［material］=0.25 g/L，［Cr（Ⅵ）］=10 mg/L，pH=2	100%， 2 h	100	光辐照
MXene^［24］	［material］=1.5 g/L，［Cr（Ⅵ）］=5 mg/L，pH=4	100%， 3 h	100	光辐照
ZIF-8负载的TiO₂^［25］	［material］=1 g/L，［Cr（Ⅵ）］=20 mg/L，pH=7	93.1%， 2 h	—	光辐照
酸改性 g-C₃N₄^［26］	［material］=1 g/L，［Cr（Ⅵ）］=40 mg/L，pH=2	99.7%， 1.25 h	—	光辐照
FeS负载的CSH，本工作	［material］=0.17 g/L，［Cr（Ⅵ）］=10 mg/L，pH=3	100%， 0.5 h	100	无光辐照

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Inorganic Acid-Base-Salt Committee of CIESC

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

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