Abstract：
:Humic substances are a major component of soil organic matter that influence the behavior and fate of heavy metals such as Cr(VI), a toxic and carcinogenic element. In the study, a repetitive extraction technique was used to fractionate humic acids (HAs) from a peat soil into three fractions (denoted as F1, F2, and F3), and the relative importance of O-containing aromatic and aliphatic domains in humic substances for scavenging Cr(VI) was addressed at pH 1. Spectroscopic analyses indicated that the concentrations of aromatic C and O-containing functional groups decreased with a progressive extraction as follows: F1>F2>F3. Cr(VI) removal by HA proceeded slowly, but it was enhanced when light was applied due to the production of efficient reductants, such as superoxide radical and H(2)O(2), for Cr(VI). Higher aromatic- and O-containing F1 fraction exhibited a greater efficiency for Cr(VI) reduction (with a removal rate of ca. 2.89 mmol g(-1) HA under illumination for 3 h). (13)C NMR and FTIR spectra further demonstrated that the carboxyl groups were primarily responsible for Cr(VI) reduction. This study implied the mobility and fate of Cr(VI) would be greatly inhibited in the environments containing such organic groups.
journal_name
Chemospherejournal_title
Chemosphereauthors
Huang SW,Chiang PN,Liu JC,Hung JT,Kuan WH,Tzou YM,Wang SL,Huang JH,Chen CC,Wang MK,Loeppert RHdoi
10.1016/j.chemosphere.2012.01.010subject
Has Abstractpub_date
2012-05-01 00:00:00pages
587-94issue
6eissn
0045-6535issn
1879-1298pii
S0045-6535(12)00031-8journal_volume
87pub_type
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