Interactive effects of rice straw biochar and γ-Al2O3 on immobilization of Zn

被引：30
|
作者：
Wu, Ping [1 ,2 ]
Cui, Peixin [1 ]
Alves, Marcelo E. [3 ]
Peijnenburg, Willie J. G. M. [4 ,5 ]
Liu, Cun [1 ]
Zhou, Dongmei [1 ]
Wang, Hailong [6 ,7 ]
Ok, Yong Sik [8 ,9 ]
Wang, Yujun [1 ]
机构：
[1] Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Escola Super Agr Luis Dequeiroz, Dept Ciencias Exatas, BR-13418900 Piracicaba, SP, Brazil
[4] Natl Inst Publ Hlth & Environm, Ctr Safety Subst & Prod, NL-3720 BA Bilthoven, Netherlands
[5] Leiden Univ, Inst Environm Sci CML, NL-2300 RA Leiden, Netherlands
[6] Foshan Univ, Biochar Engn Technol Res Ctr Guangdong Prov, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China
[7] Zhejiang A&F Univ, Sch Environm & Resource Sci, Hangzhou 311300, Zhejiang, Peoples R China
[8] Korea Univ, Korea Biochar Reseach Ctr, Seoul, South Korea
[9] Korea Univ, Div Environm Sci & Ecol Engn, Seoul, South Korea
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2019年 / 373卷
基金：
中国国家自然科学基金;
关键词：
Black carbon; Soil remediation; Chemical stabilization; Synchrotron; Zinc immobilization; GAMMA-ALUMINA; SOIL; CARBON; ADSORPTION; LEAD; AL; SORPTION; CADMIUM; EXAFS; ZINC;
D O I：
10.1016/j.jhazmat.2019.03.076
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Biochar system technology has been proved as a sustainable remediation method for metal contaminated soils. However, little attention has been paid to the interaction between biochar and oxide minerals and their influence on metal immobilization in soils. In this study, batch-type Zn sorption experiments were conducted using the mixture of gamma-Al2O3 and rice straw biochar as a model binary geosorbent systems. In addition, advanced spectroscopic technics such as EXAFS, FTIR and XRD were performed to reveal the mechanism. EXAFS spectroscopy revealed that 62% of Zn existed as Zn-Al layered double hydroxide (LDH) on gamma-Al2O3 at pH 7.5 (for 2 mM Zn loading) within 24 h, which was 19% in the mixture. The Zn in biochar samples mainly existed as Zn-OM (53%-76%) and Zn2SiO4 (21%-47%), while the proportion of Zn2SiO4 (0-6%) was negligible compared with Zn-Al silicate (26-48%) in the mixtures. The overall findings confirmed that Al released from gamma-Al2O3 was sorbed in parallel with Zn on biochar to form Zn-Al silicate, rather than Zn-Al LDH on the gamma-Al2O3 surface. These results unveiled the dynamic interactions between amended biochar and soil oxide minerals which can significantly affect the immobilization pathways of metals in contaminated soils.
引用
收藏
页码：250 / 257
页数：8
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