Abstract：
:In this research, mechanochemical reduction was carried out to remediate Cr(VI) contaminated soil, and the reduction effectiveness was evaluated by analyzing the corresponding leachable fraction obtained through the toxicity characteristic leaching procedure (TCLP) proposed by the EPA. The results indicated that mechanochemical reduction can efficiently reduce the Cr(VI) concentration in the leachate. Under a milling time of 2 h, milling speed of 500 rpm, ball-to-powder weight ratio of 14 and Na2S dosage of 5%, the Cr(VI) leaching concentration significantly decreased from 663.98 mg L-1 to 0.84 mg L-1, much lower than the regulatory limit of 5 mg L-1. In addition, the significant decrease in Cr(VI) was mainly due to the reduction of Cr(VI) to Cr(III), as supported by X-ray photoelectron spectroscopy (XPS). The mechanochemical reduction with mechanism proposed in this experiment may involve two major processes: solidification and reduction (stabilization).
journal_name
Chemospherejournal_title
Chemosphereauthors
Yuan W,Xu W,Wu Z,Zhang Z,Wang L,Bai J,Wang X,Zhang Q,Zhu X,Zhang C,Wang Jdoi
10.1016/j.chemosphere.2018.08.121subject
Has Abstractpub_date
2018-12-01 00:00:00pages
540-547eissn
0045-6535issn
1879-1298pii
S0045-6535(18)31596-0journal_volume
212pub_type
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