Abstract：
:Effect of phosphate on the reduction of U(VI) on nZVI was determined by batch, XPS, XANES and EXAFS techniques. The batch experiments showed that nZVI was quite effective for the removal of uranium under the anaerobic conditions, whereas the addition of phosphate enhanced uranium removal over wide pH range. At low pH, the reduction of U(VI) to U(IV) significantly decreased with increasing phosphate concentration by XPS and XANES analysis. According to EXAFS analysis, the occurrence of UU shell at 10 mg/L phosphate and pH 4.0 was similar to that of U(IV)O2(s), whereas the UP and UFe shells were observed at 50 mg/L phosphate, revealing that reductive co-precipitate (U(IV)O2(s)) and precipitation of uranyl-phosphate were observed at low and high phosphate, respectively. The findings are crucial for the prediction of the effect of phosphate on the speciation and binding of uranium by nZVI at low pH, which is significant in controlling the mobility of U(VI) in contaminated environments.
journal_name
Chemospherejournal_title
Chemosphereauthors
Qiu M,Wang M,Zhao Q,Hu B,Zhu Ydoi
10.1016/j.chemosphere.2018.03.057subject
Has Abstractpub_date
2018-06-01 00:00:00pages
764-771eissn
0045-6535issn
1879-1298pii
S0045-6535(18)30471-5journal_volume
201pub_type
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