Degradation of p-Chloronitrobenzene in Aqueous Solution by Iron Silicate Catalytic Ozonation

2014 ◽  
Vol 955-959 ◽  
pp. 2162-2168 ◽  
Author(s):  
Yue Liu ◽  
Lei Liu ◽  
Wei Jin Gong
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Catalytic Ozonation ◽  
Iron Silicate ◽  
Radical Scavenger ◽  
Efficient Catalyst ◽  
Green Catalyst ◽  
Hydroxyl Radical Scavenger ◽  
Radical Type ◽  
Ozonation Process

Iron silicate, a stable and efficient catalyst prepared in the laboratory has been successfully used as a catalyst combined with ozonation in the degradation of p-Chloronitrobenzene (pCNB). The catalytic ozonation removal effectiveness of pCNB was investigated under various physicochemical conditions. Both the adsorption and the single ozonation were not effective for the degradation of pCNB, but the presence of iron silicate in ozonation process could substantially enhance the pCNB removal efficiency. The hydroxyl radical scavenger experiment confirmed that iron silicate catalytic ozonation followed a radical-type mechanism. The increasing of both the iron silicate dosage and the ozone dosage could enhance the removal effectiveness of pCNB. The iron silicate catalyst could be recycled easily without decreasing any ozone catalytic activity after four successive reuses. It is concluded that the iron silicate was an efficient green catalyst for pCNB degradation in drinking water.

Manganese Silicate Catalyzed Ozonation of m-Chloronitrobenzene in Drinking Water

2011 ◽  
Vol 239-242 ◽  
pp. 1159-1164
Author(s):  
Yue Liu ◽  
Zhong Lin Chen ◽  
Yu Liu ◽  
Ying Han ◽  
He Wang ◽  
...  
Keyword(s):  
Drinking Water ◽  
Catalytic Activity ◽  
Catalytic Ozonation ◽  
Radical Scavenger ◽  
Efficient Catalyst ◽  
Green Catalyst ◽  
Manganese Silicate ◽  
Hydroxyl Radical Scavenger ◽  
Radical Type ◽  
Ozonation Process

Manganese silicate, a stable and efficient catalyst prepared in the laboratory has been successfully used as a catalyst combined with ozonation in the degradation of m-Chloronitrobenzene (mCNB). The catalytic ozonation removal effectiveness of mCNB was investigated under various physicochemical conditions. Both the adsorption and the single ozonation were not effective for the degradation of mCNB, but the presence of manganese silicate in ozonation process could substantially enhance the mCNB removal efficiency. The hydroxyl radical scavenger experiment confirmed that manganese silicate catalytic ozonation followed a radical - type mechanism. The increasing of the manganese silicate dosage could enhance the removal effectiveness of mCNB. The manganese silicate catalyst could be recycled easily without decreasing any ozone catalytic activity after four successive reuses. It is concluded that the manganese silicate was an efficient green catalyst for mCNB degradation in drinking water.

Ozonation catalyzed by iron silicate for the degradation of o-chloronitrobenzene in drinking water

2012 ◽  
Vol 12 (1) ◽  
pp. 31-37 ◽  
Author(s):  
Y. Liu ◽  
Z. Chen ◽  
L. Yang ◽  
Y. Han ◽  
J. Shen ◽  
...  
Keyword(s):  
Active Species ◽  
Catalytic Ozonation ◽  
Iron Silicate ◽  
Radical Scavenger ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Hydroxyl Radical Scavenger ◽  
Silicate Surface ◽  
Ozonation Process ◽  
Hydroxylated Surface

This paper aimed to reveal the effectiveness and the mechanism of catalytic ozonation in the presence of iron silicate for the degradation of o-chloronitrobenzene (oCNB). Experimental results show that catalytic ozonation in the presence of iron silicate could substantially enhance oCNB removal efficiency compared with ozonation alone, and that the adsorption of oCNB on the iron silicate surface had no significant effect on the degradation of oCNB. The results of a hydroxyl radical scavenger experiment using spin-trapping/EPR technology to identify hydroxyl radicals (•OH) confirm that •OH were the main active species in the removal of oCNB during the ozonation process catalyzed by iron silicate. The catalytic activity of the iron silicate was related to a highly hydroxylated surface. It was confirmed that the surface hydroxyl groups on the iron silicate were the reaction sites between ozone and oCNB.

scholarly journals AuNPs-Based Thermoresponsive Nanoreactor as an Efficient Catalyst for the Reduction of 4-Nitrophenol

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 963
Author(s):  
Wei Liu ◽  
Xiaolian Zhu ◽  
Chengcheng Xu ◽  
Zhao Dai ◽  
Zhaohui Meng
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Phase Transformation ◽  
Catalytic Activity ◽  
Catalytic Efficiency ◽  
Environmental Pollutant ◽  
Temperature Sensitive ◽  
Efficient Catalyst ◽  
Catalytic Rate ◽  
Silica Core

A new AuNPs-based thermosensitive nanoreactor (SiO2@PMBA@Au@PNIPAM) was designed and prepared by stabilizing AuNPs in the layer of poly(N,N’-methylenebisacrylamide) (PMBA) and subsequent wrapping with the temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) layer. The new nanoreactor exhibited high dispersibility and stability in aqueous solution and effectively prevented the aggregation of AuNPs caused by the phase transformation of PNIPAM. The XPS and ATR-FTIR results indicated that AuNPs could be well stabilized by PMBA due to the electron transfer between the N atoms of amide groups in the PMBA and Au atoms of AuNPs. The catalytic activity and thermoresponsive property of the new nanoreactor were invested by the reduction of the environmental pollutant, 4-nitrophenol (4-NP), with NaBH4 as a reductant. It exhibited a higher catalytic activity at 20 °C and 30 °C (below LCST of PNIPAM), but an inhibited catalytic activity at 40 °C (above LCST of PNIPAM). The PNIPAM layer played a switching role in controlling the catalytic rate by altering the reaction temperature. In addition, this nanoreactor showed an easily recyclable property due to the existence of a silica core and also preserved a rather high catalytic efficiency after 16 times of recycling.

Combined UV catalytic ozonation process on iron loaded peanut shell ash for the removal of methylene blue from aqueous solution

2020 ◽  
Vol 200 ◽  
pp. 231-240
Author(s):  
Amir Ikhlaq ◽  
Farhan Javed ◽  
Ayesha Niaz ◽  
Hafiz Muhammad Shahzad Munir ◽  
Fei Qi
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Catalytic Ozonation ◽  
Peanut Shell ◽  
Ozonation Process

Fe3O4@TiO2preparation and catalytic activity in heterogeneous photocatalytic and ozonation processes

2015 ◽  
Vol 5 (2) ◽  
pp. 1143-1152 ◽  
Author(s):  
L. Ciccotti ◽  
L. A. S. do Vale ◽  
T. L. R. Hewer ◽  
R. S. Freire
Keyword(s):  
Catalytic Activity ◽  
Magnetic Nanoparticle ◽  
Catalytic Ozonation ◽  
Systematic Evaluation ◽  
Hybrid Catalyst ◽  
Heterogeneous Catalytic ◽  
Nanoparticle Preparation ◽  
Ozonation Process

Systematic evaluation of experimental variables in magnetic nanoparticle preparation and hybrid catalyst application in the heterogeneous catalytic ozonation process.

Heterogeneous catalytic ozonation of 2, 4-dinitrophenol in aqueous solution by magnetic carbonaceous nanocomposite: catalytic activity and mechanism

2015 ◽  
Vol 57 (43) ◽  
pp. 20447-20456 ◽  
Author(s):  
Yousef Dadban Shahamat ◽  
Mahdi Sadeghi ◽  
Ali Shahryari ◽  
Niloofar Okhovat ◽  
Farshad Bahrami Asl ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Catalytic Ozonation ◽  
Heterogeneous Catalytic

Catalytic ozonation of bisphenol A in aqueous solution using Mn-Ce/HZSM-5 as catalyst

2015 ◽  
Vol 72 (5) ◽  
pp. 696-703 ◽  
Author(s):  
Yanfang Liu ◽  
Junna Zhao ◽  
Zaixing Li ◽  
Guixia Li ◽  
Wei Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Bisphenol A ◽  
Heterogeneous Catalysts ◽  
Butyl Alcohol ◽  
Catalytic Ozonation ◽  
Point Of Zero Charge ◽  
Toc Removal ◽  
Tert Butyl Alcohol ◽  
Bpa Removal

Mixed manganese and cerium oxide supported on HZSM-5 were synthesized and used as heterogeneous catalysts for ozonation of bisphenol A (BPA) in aqueous solution. The prepared catalysts of Mn-Ce/HZSM-5 were characterized by X-ray diffraction, scanning electron microscopy and Fourier transform-infrared spectroscopy. The results indicated that Mn-Ce/HZSM-5 exhibits extraordinary catalytic activity for the degradation of BPA. Removal of 89.3% of BPA and 90.4% of total organic carbon (TOC) was achieved in 30 min, compared to non-catalytic ozonation, where only 50.5% BPA and 28.1% TOC removal were reached under the same conditions. Adsorption of BPA on HZSM-5 support and Mn-Ce/HZSM-5 catalysts was negligible. The strong inhibition of BPA removal by tert-butyl alcohol indicated that the attack of hydroxyl radicals was responsible for the improvement of catalytic ozonation. It was observed that at neutral pH, which is near the point of zero charge of the catalyst, the catalytic activity reached its maximum. Increasing the amount of Mn-Ce/HZSM-5 catalyst until it exceeded 3 g/L did not show a strong effect on BPA removal. The catalysts showed high stability and reusability.

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