Biochar-templated g-C3N4/Bi2O2CO3/CoFe2O4 nano-assembly for visible and solar assisted photo-degradation of paraquat, nitrophenol reduction and CO2 conversion

Amit Kumar, Ajay Kumar, Gaurav Sharma, Ala'a H. Al-Muhtaseb, Mu Naushad, Ayman A. Ghfar, Changsheng Guo, Florian J. Stadler

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The development of novel visible powered nano-heterojunctions with multi-pronged capabilities for environmental and catalytic applications has been gaining importance for persistent pollutant degradation & clean energy production. A magnetically recoverable biochar supported ternary g-C3N4/Bi2O2CO3/CoFe2O4 heterojunction (BCBF) was fabricated which shows a high visible photoactivity. The heterojunction was used for degradation of pesticide paraquat under visible radiation (Xe lamp), natural sunlight, photo-ozonation, peroxymonosulphate, and coupled conditions. A high degradation of 99.3% was achieved under visible radiation in 90 min and 92.1% under solar light in 120 min. Biochar supported ternary junction performs manifold faster than Bi2O2CO3/CoFe2O4, g-C3N4/CoFe2O4, g-C3N4/CoFe2O4, Bi2O2CO3 (BOC), CoFe2O4 (CF) and g-C3N4 (CN). The effect of operational parameters as effect of pH, H2O2, anions, ozone and peroxymonosulphate (PMS) was also studied. In BCBF + PMS + O3 + Vis protocol a spectacular complete degradation was observed in less than 30 min. Ternary band structure efficiently reduces the charge recombination rate and promotes spectral activity which was confirmed by photoluminescence, photocurrent response and EIS analysis. By LC-MS, scavenging experiments and ESR studies a possible mechanism was also proposed. Cyto-toxicity studies of degraded products on human peripheral blood cells revealed almost 99% cell viability affirming the complete mineralization. The junction was also used for reduction of 4-nitrophenol into 4-aminophenol with complete conversion in less than 5 min with rate constant 13.05 × 10−3 s−1. In addition the ternary junction shows a high visible powered conversion of CO2 producing CH4 (∼119 µmol g−1), CO (∼131 µmol g−1) and O2 (∼242 µmol g−1) with a high rate constant of 13.05 × 10−3 s−1.

Original languageEnglish
Pages (from-to)393-410
Number of pages18
JournalChemical Engineering Journal
Volume339
DOIs
Publication statusPublished - May 1 2018

Fingerprint

paraquat
Nitrophenols
Paraquat
Photodegradation
photodegradation
Heterojunctions
Degradation
degradation
Rate constants
Cells
electron spin resonance
Radiation
recombination
Ozonization
anion
Scavenging
viability
Cytotoxicity
Pesticides
pesticide

Keywords

  • Carbon nitride
  • CO conversion
  • Environmental
  • Nano-heterojunction
  • Peroxymonosulphate
  • Photodegradation

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

Biochar-templated g-C3N4/Bi2O2CO3/CoFe2O4 nano-assembly for visible and solar assisted photo-degradation of paraquat, nitrophenol reduction and CO2 conversion. / Kumar, Amit; Kumar, Ajay; Sharma, Gaurav; Al-Muhtaseb, Ala'a H.; Naushad, Mu; Ghfar, Ayman A.; Guo, Changsheng; Stadler, Florian J.

In: Chemical Engineering Journal, Vol. 339, 01.05.2018, p. 393-410.

Research output: Contribution to journalArticle

Kumar, Amit ; Kumar, Ajay ; Sharma, Gaurav ; Al-Muhtaseb, Ala'a H. ; Naushad, Mu ; Ghfar, Ayman A. ; Guo, Changsheng ; Stadler, Florian J. / Biochar-templated g-C3N4/Bi2O2CO3/CoFe2O4 nano-assembly for visible and solar assisted photo-degradation of paraquat, nitrophenol reduction and CO2 conversion. In: Chemical Engineering Journal. 2018 ; Vol. 339. pp. 393-410.
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abstract = "The development of novel visible powered nano-heterojunctions with multi-pronged capabilities for environmental and catalytic applications has been gaining importance for persistent pollutant degradation & clean energy production. A magnetically recoverable biochar supported ternary g-C3N4/Bi2O2CO3/CoFe2O4 heterojunction (BCBF) was fabricated which shows a high visible photoactivity. The heterojunction was used for degradation of pesticide paraquat under visible radiation (Xe lamp), natural sunlight, photo-ozonation, peroxymonosulphate, and coupled conditions. A high degradation of 99.3{\%} was achieved under visible radiation in 90 min and 92.1{\%} under solar light in 120 min. Biochar supported ternary junction performs manifold faster than Bi2O2CO3/CoFe2O4, g-C3N4/CoFe2O4, g-C3N4/CoFe2O4, Bi2O2CO3 (BOC), CoFe2O4 (CF) and g-C3N4 (CN). The effect of operational parameters as effect of pH, H2O2, anions, ozone and peroxymonosulphate (PMS) was also studied. In BCBF + PMS + O3 + Vis protocol a spectacular complete degradation was observed in less than 30 min. Ternary band structure efficiently reduces the charge recombination rate and promotes spectral activity which was confirmed by photoluminescence, photocurrent response and EIS analysis. By LC-MS, scavenging experiments and ESR studies a possible mechanism was also proposed. Cyto-toxicity studies of degraded products on human peripheral blood cells revealed almost 99{\%} cell viability affirming the complete mineralization. The junction was also used for reduction of 4-nitrophenol into 4-aminophenol with complete conversion in less than 5 min with rate constant 13.05 × 10−3 s−1. In addition the ternary junction shows a high visible powered conversion of CO2 producing CH4 (∼119 µmol g−1), CO (∼131 µmol g−1) and O2 (∼242 µmol g−1) with a high rate constant of 13.05 × 10−3 s−1.",
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AU - Kumar, Amit

AU - Kumar, Ajay

AU - Sharma, Gaurav

AU - Al-Muhtaseb, Ala'a H.

AU - Naushad, Mu

AU - Ghfar, Ayman A.

AU - Guo, Changsheng

AU - Stadler, Florian J.

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N2 - The development of novel visible powered nano-heterojunctions with multi-pronged capabilities for environmental and catalytic applications has been gaining importance for persistent pollutant degradation & clean energy production. A magnetically recoverable biochar supported ternary g-C3N4/Bi2O2CO3/CoFe2O4 heterojunction (BCBF) was fabricated which shows a high visible photoactivity. The heterojunction was used for degradation of pesticide paraquat under visible radiation (Xe lamp), natural sunlight, photo-ozonation, peroxymonosulphate, and coupled conditions. A high degradation of 99.3% was achieved under visible radiation in 90 min and 92.1% under solar light in 120 min. Biochar supported ternary junction performs manifold faster than Bi2O2CO3/CoFe2O4, g-C3N4/CoFe2O4, g-C3N4/CoFe2O4, Bi2O2CO3 (BOC), CoFe2O4 (CF) and g-C3N4 (CN). The effect of operational parameters as effect of pH, H2O2, anions, ozone and peroxymonosulphate (PMS) was also studied. In BCBF + PMS + O3 + Vis protocol a spectacular complete degradation was observed in less than 30 min. Ternary band structure efficiently reduces the charge recombination rate and promotes spectral activity which was confirmed by photoluminescence, photocurrent response and EIS analysis. By LC-MS, scavenging experiments and ESR studies a possible mechanism was also proposed. Cyto-toxicity studies of degraded products on human peripheral blood cells revealed almost 99% cell viability affirming the complete mineralization. The junction was also used for reduction of 4-nitrophenol into 4-aminophenol with complete conversion in less than 5 min with rate constant 13.05 × 10−3 s−1. In addition the ternary junction shows a high visible powered conversion of CO2 producing CH4 (∼119 µmol g−1), CO (∼131 µmol g−1) and O2 (∼242 µmol g−1) with a high rate constant of 13.05 × 10−3 s−1.

AB - The development of novel visible powered nano-heterojunctions with multi-pronged capabilities for environmental and catalytic applications has been gaining importance for persistent pollutant degradation & clean energy production. A magnetically recoverable biochar supported ternary g-C3N4/Bi2O2CO3/CoFe2O4 heterojunction (BCBF) was fabricated which shows a high visible photoactivity. The heterojunction was used for degradation of pesticide paraquat under visible radiation (Xe lamp), natural sunlight, photo-ozonation, peroxymonosulphate, and coupled conditions. A high degradation of 99.3% was achieved under visible radiation in 90 min and 92.1% under solar light in 120 min. Biochar supported ternary junction performs manifold faster than Bi2O2CO3/CoFe2O4, g-C3N4/CoFe2O4, g-C3N4/CoFe2O4, Bi2O2CO3 (BOC), CoFe2O4 (CF) and g-C3N4 (CN). The effect of operational parameters as effect of pH, H2O2, anions, ozone and peroxymonosulphate (PMS) was also studied. In BCBF + PMS + O3 + Vis protocol a spectacular complete degradation was observed in less than 30 min. Ternary band structure efficiently reduces the charge recombination rate and promotes spectral activity which was confirmed by photoluminescence, photocurrent response and EIS analysis. By LC-MS, scavenging experiments and ESR studies a possible mechanism was also proposed. Cyto-toxicity studies of degraded products on human peripheral blood cells revealed almost 99% cell viability affirming the complete mineralization. The junction was also used for reduction of 4-nitrophenol into 4-aminophenol with complete conversion in less than 5 min with rate constant 13.05 × 10−3 s−1. In addition the ternary junction shows a high visible powered conversion of CO2 producing CH4 (∼119 µmol g−1), CO (∼131 µmol g−1) and O2 (∼242 µmol g−1) with a high rate constant of 13.05 × 10−3 s−1.

KW - Carbon nitride

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KW - Peroxymonosulphate

KW - Photodegradation

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