4.7 Article

Mechanisms of persulfate activation on biochar derived from two different sludges: Dominance of their intrinsic compositions

Journal

JOURNAL OF HAZARDOUS MATERIALS
Volume 408, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124454

Keywords

Sludge deposition; Persulfate activation; Biochar; PFRs; Structure-activity relationship

Funding

  1. National Natural Science Foundation of China [51578391]
  2. State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRK18007]

Ask authors/readers for more resources

The study found that higher organic and nitrogen content in sludge led to more functional groups and carbon layer polymerization in SDBC, which increased the efficiency of PS activation.
Sludge-derived biochar (SDBC) has been regarded as persulfate (PS) activator during the remediation of organic contamination. However, the complexity of sludge composition makes it difficult to predict the activity of SDBC and the efficacy of PS. To improve the understanding of how the composition of sludge regulated activity of its parent SDBC towards PS activation, we used two SDBCs derived from different sludges with significantly different organic compositions and metals. Results indicated the higher content of organic and nitrogen content in sludge led to higher polymerization and condensation of carbon layer and more moieties in SDBC1, whereas more Fe species (e.g. Fe-O, Fe2+ and Fe3+) formed in SDBC2. According to the results of phenol (PN) degradation in SDBC/PS, the apparent rate constants (k(obs)) of SDBC2-700 (0.0037 min(-1)) was 2 folds higher than that of SDBC1-700 (0.0016 min(-1)), whereas the SDBC1-500 (6.0 x 10(-4) min(-1)) exhibited higher k(obs) than that of SDBC2-500 (4.9 x 10(-4) min(-1)). The difference of PS activation by different SDBCs mainly relied on generated reactive oxygen species (ROS). The persistent free radicals (PFRs) and Fe species acted as redox sites for generated ROS, which were depended on the organic compositions and involved metals in used sludges.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available