Photocatalytic degradation of 2,4,4′-trichlorobiphenyl into long-chain alkanes using Ag nanoparticle decorated flower-like ZnO microspheres

Deng, Quan; Tang, Haibin; Liu, Gang; Song, Xiaoping; Kang, Shenhong; Wang, Huimin; Ng, Dickon H. L.; Wang, Guozhong

doi:10.1039/c5nj00343a

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…Ansari et al synthesized 1 and 3 % Ag@ZnO nanocomposites via a gel combustion route, and observed the photodegradation of methylene blue (MB) [32]. Very toxic PCB (2,4,4′-trichlorobiphenyl, PCB28) was degraded photocatalytically using Ag/ZnO microspheres under UV light irradiation [22]. Kuriakose et al deposited Ag on ZnO nanospindles using a citrate-assisted photo-reduction method and tested them on photocatalytic MO degradation.…”

Section: Introductionmentioning

confidence: 99%

Band gap-engineered ZnO and Ag/ZnO by ball-milling method and their photocatalytic and Fenton-like photocatalytic activities

Choi

Jung

Shin

et al. 2015

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Band gap-engineered ZnO and Ag/ZnO by ball-milling method and their photocatalytic and Fenton-like photocatalytic activities

Choi

Jung

Shin

et al. 2015

Applied Surface Science

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“…In another study by Deng [ 27 ], found tetradecane and pentadecane as product during photocatalytic degradation of 2,4,4-TCB. Comparing results of present study with, Deng [ 27 ], tetradecane 1-chloro only one similar compound was found. Other compound, nona, hexa, hepta and octadecane 1-chloro was not found in study by Dung.…”

Section: Resultsmentioning

confidence: 99%

Ozone oxidation of wastewater containing trichlorobiphenyl and used transformer oil

Abbasi

Bhatti

Mahmood

et al. 2020

Heliyon

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Trichlorobiphenyl (TCB) is a persistent toxic organic compound and exerts more hydrophilicity than other polychlorinated biphenyl (PCB) compounds. PCBs have been used on large scale in transformer oil. To observe the strong ozone oxidation effect on the degradation of TCB in aqueous medium, synthetic wastewater was prepared from transformer oil with TCB. Microbubbles ozonation of TCB was done in order to completely oxidize it. A batch treatment system was used for 60 min in glass column with a diffuser at the bottom to convert ozone gas into microbubbles. GCMS analyzed TCB and other toxic compounds before and after the treatment. TCB was reduced to below detection limit during the first 20 min of ozonation. Ethylbenzene and 1-chloroheptacosine were identified after 10 and 20 min, the concentrations of these compounds increased to 1.45 and 3.9 mg/L after 60 min. Alkane with chlorine containing compounds were identified more than any other compounds. The alkanes compounds with chlorine, such as tetradecane 1-chloro, hexadecane 1-chloro, heptadecane 1-chloro, octadecane 1-chloro and nonadecane 1-chloro were found during 60 min of ozonation. Chemical oxygen demand (COD) in the wastewater reduced from 700 to 390 mg/L. Small increase in pH was observed from 7.7 to 8.3. In this study it was concluded that TCB and other pollutants in transformer oil were degraded with ozone dose, 0.05 g/min L in the shortest period of 60 min.

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“…However, it's necessary to mention that, for the 3D Ag-NPs/ZnO nanorod hybrid substrate, photocatalytic degradation of PCB77 may happen based on the previous research. 202 Intermediate products, which have similar chemical structures but higher affinity to the SERS substrate, could cause interference. Capture of analytes with surface-functionalized SERS substrates.-When analytes cannot be directly absorbed on a bare SERS substrate, surface functionalization is performed on the SERS substrate surface.…”

Section: -180mentioning

confidence: 99%

Review—Surface-Enhanced Raman Scattering Sensors for Food Safety and Environmental Monitoring

Tang

Zhu

Meng

et al. 2018

J. Electrochem. Soc.

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167

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This article gives a review of surface-enhanced Raman scattering (SERS) sensors for food safety and environmental pollution monitoring. It introduces the basic concepts of SERS substrates, SERS enhancement factors and mechanisms, SERS probes/labels, molecular recognition elements as well as optofluidic SERS devices (SERS sensors integrated with microfluidics). This article places an emphasis on the design strategies of various SERS sensors by utilizing fingerprinting SERS spectra or by using SERS probes. It highlights the applications of SERS sensors in detection of heavy metals (such as Hg 2+ , Pb 2+ , Cd 2+ and As 3+ ), inorganic anions (nitrite, nitrate, perchlorate and fluoride), toxic small molecules (polycyclic aromatic hydrocarbon, polychlorinated biphenyls, herbicides, pesticides, antibiotics and food additives), as well as pathogens (bacteria and viruses Food safety and environment pollution are among great challenges in the human society. There are some common pollutants in the environment and food, such as heavy metals, nitrites, phosphates, pesticides, herbicides, antibiotics, hormone, pathogens and other additives. Some pollutants initially are released into the environment, and then accumulate in the food chain, and enter human bodies. Uptake of pollutants by human poses a threat to human health to different extents. 1,2Hence it is essential to monitor pollutants in the environment and food. Currently pollutants are typically measured with various laboratorybased techniques, such as atomic absorption spectroscopy, atomic fluorescence spectrometry, X-ray fluorescence spectrum, inductively coupled plasma and ion-coupled plasma-mass spectroscopy, mass spectrometry, chromatography, capillary electrophoresis, analytical profile index (API), polymerase chain reaction (PCR), and enzymelinked immunosorbent assay (ELISA).3-7 Although these techniques have high sensitivity and accuracy, they rely on expensive instruments and require professional to treat samples and operate instruments in centralized laboratories. Additionally, analysis generally takes several hours to days. For example, 0.024 ppb of Hg 2+ and 0.023 ppb of As 3+ in drinking water can be detected using atomic absorption spectroscopy with a two-step electrothermal atomizer and hydride generation atomic fluorescence spectrometry, respectively. 8,9 However, they need multiple sample preconcentration processing and expensive instruments. PCR can improve the number of the target while ELISA can produce amplified recognition signal, which could both improve the detection sensitivity to pathogens. For example, oligonucleotide microarray with combination of CdSe/ZnS quantum dots as fluorescent labels shown high specificity and sensitivity of 10 colony forming units (CFU)/mL. 10 However, the complicated procedures are very time-consuming, and the method is also vulnerable to contamination. These laboratory-based techniques cannot meet the critical need of rapid on-site measurement of pollutants. Therefore, it is essential to develop portable sensors f...

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Photocatalytic degradation of 2,4,4′-trichlorobiphenyl into long-chain alkanes using Ag nanoparticle decorated flower-like ZnO microspheres

Cited by 6 publications

References 25 publications

Band gap-engineered ZnO and Ag/ZnO by ball-milling method and their photocatalytic and Fenton-like photocatalytic activities

Band gap-engineered ZnO and Ag/ZnO by ball-milling method and their photocatalytic and Fenton-like photocatalytic activities

Ozone oxidation of wastewater containing trichlorobiphenyl and used transformer oil

Review—Surface-Enhanced Raman Scattering Sensors for Food Safety and Environmental Monitoring

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