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Hydrothermal treatment of arsenic sulfide slag to immobilize arsenic into scorodite and recycle sulfur
Zhang, Weifang; Lu, Hongbo; Liu, Feng; Wang, Chunli; Zhang, Zhihao; Zhang, Jing
2021-03-15
Source PublicationJOURNAL OF HAZARDOUS MATERIALS
ISSN0304-3894
Volume406Pages:-
AbstractArsenic sulfide slag (ASS) is typically by-produced from arsenic-containing wastewater treatment. In this work, a novel hydrothermal treatment method with the assistance of Fe(NO3)(3) (HT-Fe(NO3)(3)) was developed to detoxify ASS by transforming arsenic into scorodite and extracting sulfur in one step. After hydrothermal treatment, As (III) in ASS was oxidized and immobilized into the stable scorodite with a high As immobilization efficiency (similar to 99%), and the toxicity leachability of arsenic-containing solid waste significantly reduced from 634.2 to 2.5 mg/L, well below the discharge standard of solid waste. Further study reveals that the nucleation and growth process was fit well by Avrami-Erofeev model and followed Ostwald step rule, which involved the As2S3 dissolution, formation of amorphous ferric arsenate and then crystallization within the amorphous precursor. In this process, sulfur originated from As2S3 played an important role by serving as the heterogeneous nuclei to decrease the barrier for the formation of amorphous ferric arsenate, and facilitated the transformation of as formed scorodite from nano-sheet aggregates to the bulk and dense spherical polymorph, which further increased the stability of the arsenic contained solid product. This study will shed light on the development of new technologies for treatment of industrial solid waste and recycle of useful resources.
Department环境纳米技术与健康效应重点实验室
KeywordArsenic sulfide slag Hydrothermal treatment Scorodite Crystal growth
WOS Research AreaEngineering, Environmental ; Environmental Sciences
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/45886
Collection环境纳米技术与健康效应重点实验室
Affiliation1.Fujian Normal Univ, Coll Environm Sci & Engn, Fuzhou 350007, Peoples R China
2.Fujian Normal Univ, Key Lab Resource Cycle & Pollut Control Fujian Pr, Fuzhou 350007, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Environm Nanotechnol & Hlth Effect, Beijing 100085, Peoples R China
4.Univ Chinese Acad Sci, Natl Engn Lab VOCs Pollut Control Mat & Technol, Beijing 101408, Peoples R China
5.China Univ Min & Technol Beijing, Sch Chem & Environm Engn, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Weifang,Lu, Hongbo,Liu, Feng,et al. Hydrothermal treatment of arsenic sulfide slag to immobilize arsenic into scorodite and recycle sulfur[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,406:-.
APA Zhang, Weifang,Lu, Hongbo,Liu, Feng,Wang, Chunli,Zhang, Zhihao,&Zhang, Jing.(2021).Hydrothermal treatment of arsenic sulfide slag to immobilize arsenic into scorodite and recycle sulfur.JOURNAL OF HAZARDOUS MATERIALS,406,-.
MLA Zhang, Weifang,et al."Hydrothermal treatment of arsenic sulfide slag to immobilize arsenic into scorodite and recycle sulfur".JOURNAL OF HAZARDOUS MATERIALS 406(2021):-.
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