干旱区生态环境知识资源中心(Arid): Naked oats biochar-supported nanoscale zero-valent iron composite: effects on Cd immobilization and enzyme activities in Ulansuhai River sediments of China

Arid

DOI	10.1007/s11368-019-02278-7
	Naked oats biochar-supported nanoscale zero-valent iron composite: effects on Cd immobilization and enzyme activities in Ulansuhai River sediments of China
	Han, Baohong; Song, Lei; Li, Hao; So, Hongwei
通讯作者	Song, Lei
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
ISSN	1439-0108
EISSN	1614-7480
出版年	2019
卷号	19 期号:5 页码:2650-2662
英文摘要	Purpose This investigation aimed to synthesize biochar-supported nanoscale zero-valent iron (BC-nZVI) to immobilize cadmium (Cd) in contaminated sediments of shallow grass-type rivers in typical cold and arid regions in northern China and reduce the bioavailability of Cd. Besides, the influence of multiple factors on the immobilization effect was discussed. In particular, the effects of the addition of humic acid (HA) on the fraction of Cd and enzyme activities were investigated. Materials and methods In this study, BC-nZVI was synthesized and all materials were characterized by field emission scanning electron microscopy (FESEM), energy dispersive spectrometer (EDS), x-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The remediation effect of BC-nZVI on Cd-contaminated sediments was evaluated through sequential extraction experiments. Batch tests such as experiments of iron-to-carbon ratio, dosage, and incubation time were examined; the effect of HA concentration on Cd immobilization was highlighted, and corresponding enzyme activities (catalase, urease, and alkaline phosphatase) were tested for further illustration. Results and discussion BC-nZVI could immobilize Cd efficiently, with the maximum residual percentage of Cd increasing by 19.57 to 81.98% after 35 days of incubation, at 1:3 iron-to-carbon ratio and 0.05 g dosage. Sequential extraction experiments indicated that most labile fractions of Cd were transformed into stable fraction. When 10 and 20 mg kg(-1) HA were added, immobilization was enhanced, and residual fraction increased to 89.43% and 88.70%, respectively. Meanwhile, exclusive of catalase, the activities of urease and alkaline phosphatase were enhanced with increased incubation time. Conclusions This study proved that BC-nZVI has a significant effect on Cd immobilization. The addition of HA greatly promoted the immobilization of Cd and enzyme activities in sediments. In conclusion, BC-nZVI is an effective substance that can be used to remediate sediments contaminated with heavy metals.
英文关键词	Biochar Cadmium Enzyme activities Humic acid Nanoscale zero-valent iron
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000464836300044
WOS关键词	HEAVY-METALS ; CONTAMINATED SOILS ; ZEROVALENT IRON ; HUMIC SUBSTANCES ; CHROMIUM VI ; REMOVAL ; NZVI ; STABILIZATION ; CADMIUM ; REMEDIATION
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217327
作者单位	Inner Mongolia Univ Technol, Sch Civil Engn, Hohhot 010051, Peoples R China
推荐引用方式 GB/T 7714	Han, Baohong,Song, Lei,Li, Hao,et al. Naked oats biochar-supported nanoscale zero-valent iron composite: effects on Cd immobilization and enzyme activities in Ulansuhai River sediments of China[J],2019,19(5):2650-2662.
APA	Han, Baohong,Song, Lei,Li, Hao,&So, Hongwei.(2019).Naked oats biochar-supported nanoscale zero-valent iron composite: effects on Cd immobilization and enzyme activities in Ulansuhai River sediments of China.JOURNAL OF SOILS AND SEDIMENTS,19(5),2650-2662.
MLA	Han, Baohong,et al."Naked oats biochar-supported nanoscale zero-valent iron composite: effects on Cd immobilization and enzyme activities in Ulansuhai River sediments of China".JOURNAL OF SOILS AND SEDIMENTS 19.5(2019):2650-2662.