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Removal mechanism of di-n-butyl phthalate and oxytetracycline from aqueous solutions by nano-manganese dioxide modified biochar

In this work, nano-manganese dioxide (nMnO 2 )-modified biochar (BC) was synthesized in order to improve BC’s adsorption capacity for di- n -butyl phthalate (DBP) and oxytetracycline (OTC). The results showed that nMnO 2 on the BC surface exhibited a poor crystallinity and oxidation state (Mn (IV))....

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Published in:Environmental science and pollution research international 2018-03, Vol.25 (8), p.7796-7807
Main Authors: Gao, Minling, Zhang, Yue, Gong, Xiaolei, Song, Zhengguo, Guo, Zeyang
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description In this work, nano-manganese dioxide (nMnO 2 )-modified biochar (BC) was synthesized in order to improve BC’s adsorption capacity for di- n -butyl phthalate (DBP) and oxytetracycline (OTC). The results showed that nMnO 2 on the BC surface exhibited a poor crystallinity and oxidation state (Mn (IV)). Sorption experiments showed that, compared to BC, DBP sorption capacity of nMnO 2 -BC (1:20) and OTC sorption capacity of nMnO 2 -BC (1:10) were 0.0364 and 0.0867 mmol/g, respectively, which are significantly higher than that of BC (0.0141 and 0.0151 mmol/g). Kinetics and isotherm experiments indicated that physical adsorption and chemical interactions have both exerted their impacts on the adsorption process. Further X-ray photoelectron spectroscopy (XPS) analysis showed that part of the Mn (IV) in nMnO 2 -BC was reduced to Mn (III) and Mn (II) after DBP or OTC adsorption. Therefore, we suggest the nMnO 2 also acted as an oxidizer on modified BC, which may accelerate the degradation of DBP and OTC.
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subjects Adsorption
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Charcoal
Charcoal - chemistry
Chemical interactions
Dibutyl Phthalate - chemistry
Dibutyl Phthalate - isolation & purification
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Kinetics
Manganese
Manganese Compounds - chemistry
Manganese dioxide
n-Butyl phthalate
Oxidation
Oxidation-Reduction
Oxides - chemistry
Oxytetracycline
Oxytetracycline - chemistry
Oxytetracycline - isolation & purification
Photoelectron spectroscopy
Phthalates
Research Article
Sorption
Spectroscopy
Valence
Waste Water Technology
Water Management
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
Water Pollution Control
Water Purification - methods
X ray photoelectron spectroscopy
title Removal mechanism of di-n-butyl phthalate and oxytetracycline from aqueous solutions by nano-manganese dioxide modified biochar
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