Effect of different types of activated carbon on the adsorption- reduction of Cr(Ⅵ) by mZVI/activated carbon

doi:10.19965/j.cnki.iwt.2024-0039

Abstract

Abstract:

Based on the excellent adsorption performance of activated carbon(AC) and its characteristic of forming a microelectrolysis system with micro zero-valent iron(mZVI), various mZVI/ACs composite materials were synthesized by ball milling(BM) method, and the removal efficiencies of Cr(Ⅵ) by these materials were explored. The mechanism of the optimal composite material for Cr(Ⅵ) removal was analyzed. The results indicated that BM could effectively combine AC with mZVI, and mZVI/AC(wood) had a better removal effect on Cr(Ⅵ) under short-term ball milling conditions. Cr(Ⅵ) in the solution was mainly reduced by secondary Fe²⁺, and AC not only enhanced the adsorption of Cr(Ⅵ) by mZVI/AC, but also promoted the corrosion of mZVI, thereby enhancing the removal of Cr(Ⅵ). By monitoring the concentration changes of Cr(Ⅵ) and total Cr, and combining with solid-phase XPS analysis, it was speculated that the potential removal pathways of Cr(Ⅵ) by mZVI/AC(wood) involved adsorption-reduction process and reduction-chelation-precipitation process.

Key words: Cr(Ⅵ), micro zero valent iron, activated carbon, corrosion, adsorption-reduction

摘要：

基于活性炭（AC）的良好吸附性能和其可与微米零价铁（mZVI）结合形成微电解体系的特性，采用球磨法（BM）合成多种mZVI/ACs复合材料，并探讨该类材料对Cr（Ⅵ）的去除效能，对最佳复合材料去除Cr（Ⅵ）的机理进行解析。研究结果表明，BM可使AC与mZVI有效结合，短时球磨条件下mZVI/AC（木质）对Cr（Ⅵ）的去除效果较优。溶液中的Cr（Ⅵ）主要由次生Fe²⁺还原，而AC不仅可加强mZVI/AC对Cr（Ⅵ）的吸附，而且还促进了mZVI的腐蚀，进而强化了对Cr（Ⅵ）的去除。通过监测Cr（Ⅵ）和总Cr的浓度变化，并结合固相XPS分析，推测mZVI/AC（木质）对Cr（Ⅵ）的潜在去除途径涉及吸附-还原过程和还原-螯合-沉淀过程。

关键词: Cr（Ⅵ）, 微米零价铁, 活性炭, 腐蚀, 吸附还原

CLC Number:

X703.1

Wenhao WANG, Yexing CHENG, Yuyin WANG, Tingting HOU, Xiaofeng WU, Yucai LI. Effect of different types of activated carbon on the adsorption- reduction of Cr(Ⅵ) by mZVI/activated carbon[J]. Industrial Water Treatment, 2025, 45(2): 150-158.

王文豪, 程业兴, 王雨银, 侯婷婷, 吴晓峰, 李玉才. 不同种类活性炭对mZVI/活性炭吸附还原Cr（Ⅵ）的影响[J]. 工业水处理, 2025, 45(2): 150-158.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0039

https://www.iwt.cn/EN/Y2025/V45/I2/150

Figures/Tables 14

Table 1 Parameters of different activated carbon

项目	木质AC	煤质AC	果壳AC
颗粒尺寸/目	325	300	325
灰分/%	<8	<10	<9
pH	8	8	7
水分/%	<9	<9	<8
表观密度/（g·mL^-1）	0.35	0.35	0.40
亚甲基蓝吸附值/（mL·g^-1）	15	12	18
强度/%	95	93	95
磨损率/%	0.1	0.1	0.1

Fig.1 The effect of types of AC on the removal of Cr（Ⅵ） by mZVI/ACs（a），and the changes of pH （b） and iron ion concentration（c） during the reaction process

Fig.2 Adsorption effects of different kinds of AC on Cr（Ⅵ）

Fig.3 Conductivities of different kinds of AC

Fig.4 Cr（Ⅵ） removal efficiencies by mZVI， mixed mZVI-AC （wood） and mZVI/AC （wood）

Fig.5 Tafel corrosion curves of mZVI and mZVI/ACs

Fig.6 SEM-EDS images of pristine mZVI（a） and mZVI/AC（wood）（b）

Fig.7 Effect of mZVI/AC mass ratio on the removal of Cr（Ⅵ）

Fig.8 Effects of initial pH on the removal of Cr（Ⅵ）

Fig.9 The reusability and rejuvenation of mZVI/AC（wood）（a） and the reusability of mZVI（b）

Fig.10 Effect of 1，10-phenanthroline on the removal of Cr（Ⅵ）

Fig.11 The removal kinetics of total Cr and Cr（Ⅵ）

Fig.12 XPS spectra

Fig.13 Schematic illustration of mechanisms of Cr（Ⅵ） removal by mZVI/AC（wood）

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