Semi Volatile Organic Compounds (SVOCs) are common contaminants found in brownfield sites that used to be agrochemical plants, chemical storage sites, and industrial areas. Chemical oxidation showed great potential to provide a rapid, cost-effective approach for SVOCs contaminate sites. Chemical oxidation using persulfate was demonstrated by degrading both lab samples and on-site samples from a local o-ansidine contaminated site in this study. The soil samples were mixed with persulfate at different ratios, while adding supplements for the purpose of persulfate thermal activation and pH control. Experiments for optimal usage and treatment duration were also investigated to provide guidance for following demonstration project. Soil samples were analyzed before and after the treatments to compare the o-ansidine concentration changes. The results suggested an optimal ratio of persulfate at 0.5% (in w/w) for this study, with 90% or more removal of most samples in 3 days, at an average cost of oxidants per ton of soil around 800 RMB. This study demonstrated the potential of persulfate oxidation as a novel and reliable approach for o-ansidine contaminated soil, as well as the possibility of extending the remediation concept for other organic contamination scenarios. In addition, persulfate oxidation could also be combined with other remediation technology in future due to its simplicity and convenience.

Phase pure Li4Ti5O12/C composite was synthesized by sol-gel method using lithium acetate CH3COOLi•2H2O and tetrabutyl titanate [Ti(OC4H9)4] as starting materials, oxalic acid as chelating agent and sucrose as an additional carbon source. The as-prepared samples were characterized by means of TG-DTA, XRD and SEM. The electrochemical properties were investigated in terms of constant-current charge/discharge cycling and high-rate dischargeability. SEM analysis indicated that the prepared Li4Ti5O12/C composite using sucrose and oxalic acid as carbon source showed a spongy nano-particle aggregate structure, with average nano-particle size of 80-100 nm. Electrochemical results showed that the Li4Ti5O12/C composite prepared in the presence of sucrose exhibited better electrochemical performance with specific discharge capacities of 204.7, 171.6, 155.3 and 154.6 mAh/g at 0.2C, 1C, 2C, and 5C rates, respectively. And the discharge capacity could still reach 143.9mAh/g after 80 cycles at 1C rate, exhibiting excellent cycling performance.