Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 388, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122120
Keywords
Hydrochar; Layered double hydroxide; Reactive oxygen species; Diethyl phthalate
Categories
Funding
- National Natural Science Foundation of China [41673092, 41972037]
- Guangdong special support program for millions of leading engineeringtalents [201626011]
- Science and Technology Plan of Guangdong Province, China [2016B020242004]
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Improving the photocatalytic capacity of hydrochar to apply in wastewater treatment is of great significance. In this study, a novel heterogeneous photocatalytic material was prepared by compounding hydrochar with FeAl layered double hydroxide (FeAl-LDH). Furthermore, hydrochar was separated into hydrochar carbon matrix (HCM) and dissolved organic matter (DOM) to analyse their contribution in the reactive oxygen species (ROS) generation. The characterization and photocatalytic property of three composites (hydrochar-LDH, HCM-LDH and DOM-LDH) were investigated. The results showed that three composites were successfully synthesized with the formation of nano-sized LDH, graphitic carbon and oxygen vacancies. Persistent free radicals (PFRs) existed in hydrochar and the amount of them increased distinctly with the presence of FeAl-LDH. The degradation efficiency of DEP by hydrochar-LDH, HCM-LDH and DOM-LDH was 5.0, 4.2 and 1.5 times than that of hydrochar within 180 min, respectively. The reasons were proposed as: (i) Both HCM-LDH and DOM-LDH could induce the formation of (OH)-O-center dot, O-2(center dot)- and O-1(2), while HCM-LDH was the main contributor to generate O-2(center dot-) and center dot OH; (ii) HCMLDH possessed many oxygenated functional groups, which were key factors affecting the formation of ROS; (iii) Fe could enhance the electron transfer process during the photoreaction, promoting the formation of ROS.
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