High-efficiency degradation of Fe-CNs in SPL through microwave-activated persulfate

被引：3

作者：

Li, Zhicong ^{[1
]}

Su, Xiujuan ^{[1
]}

Feng, Jinpeng ^{[1
,2
]}

Huang, Anyang ^{[3
]}

Mo, Wei ^{[1
]}

Ma, Shaojian ^{[1
]}

Hwang, Jiann-Yang ^{[4
]}

Jia, Hanzhong ^{[5
]}

Lin, Hongfei ^{[6
]}

机构：

[1] Guangxi Univ, Sch Resources Environm & Mat, Guangxi Key Lab Proc Nonferrous Met & Featured Mat, State Key Lab Featured Met Mat & Life cycle Safety, Nanning 530004, Guangxi, Peoples R China

[2] North China Univ Sci & Technol, Hebei Prov Key Lab Min Dev & Safety Engn, Tangshan 063009, Hebei, Peoples R China

[3] Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China

[4] Michigan Technol Univ, Dept Mat Sci & Engn, Houghton, MI 49931 USA

[5] Northwest A&F Univ, Coll Nat Resources & Environm, Xianyang 712100, Peoples R China

[6] Guangxi Bossco Environm Protect Technol Co Ltd, Nanning 530007, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2024年 / 330卷

基金：

中国国家自然科学基金;

关键词：

SPL; Cyanide; Microwave; Persulfate; AQUEOUS-SOLUTION; WASTE-WATER; OXIDATION; CYANIDE; KINETICS; REMOVAL; MECHANISM; CARBON; ACID;

D O I：

10.1016/j.seppur.2023.125575

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Cyanide in spent potlining (SPL) is primarily present as sodium cyanide (NaCN) and iron (II, III) cyanide complexes (Fe-CNs). NaCN is easy to degrade, while Fe-CNs is extremely difficult to degrade. In this work, a novel microwave-activated persulfate technology (MW-PS) was firstly proposed to degrade Fe-CNs promptly and efficiently. The removal rate of 99.88 % was achieved within 180 s under optimal conditions of pH = 10.15, [oxidant]:[Fe-CNs] molar ratio of 5:1, and microwave power of 300 W. The remaining total cyanide content was less than 0.04 mg.L-1. The degradation mechanism of ferrocyanide (II) and ferricyanide (III) in the MW-PS degradation system was systematically analyzed through electron paramagnetic resonance (EPR) and element identification techniques. The ROS (SO4 center dot-, HO center dot, O-2(center dot-), and O-1(2)) generated under microwave activation and first attacked the C-Fe complex bond in Fe-CNs, causing the bond to dissociate and release the free CN-, and then CN- was thoroughly oxidized. This work develops a simple and high-efficiency decyanation technology for complex cyanide contained industrial waste disposal.

引用

页数：14