Effect of Ultrasonic Intensity on the Degradation of Phenol Solution

2011 ◽  
Vol 393-395 ◽  
pp. 1173-1176 ◽  
Author(s):  
Mei Juan Yin ◽  
Peng Cui ◽  
Zhi Hu ◽  
Ya Zhong Chen ◽  
Wei Xiong
Keyword(s):  
Degradation Rate ◽  
Vertical Direction ◽  
Power Input ◽  
Ultrasonic Frequency ◽  
Ultrasonic Power ◽  
Phenol Solution ◽  
Ultrasonic Bath ◽  
Ultrasonic Degradation ◽  
Ultrasonic Parameters ◽  
Ultrasonic Intensity

Effect of ultrasonic intensity on the degradation of phenol solution is investigated by changing the nominal ultrasonic power, ultrasonic frequency and the position of reactor. The actual ultrasonic intensity (I) that reaches reactor is measured by ultrasonic power measuring meter. It can be found that the ultrasonic intensity varies with ultrasonic parameters. With the nominal power input improving from 60 W to 150 W, the ultrasonic intensity rises from 0.21 W•cm-2 to 1.06 W•cm-2 and the degradation rate of phenol solution (η) increases from 21.7% to 43.7%. However, when I reaches the highest value of 1.71 W•cm-2 at the frequency of 100 kHz, η decreases to the lowest value of 21.5%. The ultrasonic intensity distribution is uneven in the ultrasonic bath and η increases with an increase of I in the vertical direction. The ultrasonic degradation of phenol solution is affected by ultrasonic intensity, but η doesn’t definitely increase with an increase of ultrasonic intensity.

Ultrasonic Degradation Performance of the CeZrMo Heteropoly Salt with Keggin Structure

2012 ◽  
Vol 518-523 ◽  
pp. 2965-2968
Author(s):  
Zhi Hong Zhang ◽  
Feng Xue
Keyword(s):  
Thermal Stability ◽  
Degradation Rate ◽  
Keggin Structure ◽  
Molecular Formula ◽  
Ultrasonic Frequency ◽  
Gravimetric Analysis ◽  
Ultrasonic Power ◽  
X Ray Diffraction ◽  
Crystal Water ◽  
Good Thermal Stability

A new heteropoly salt with Keggin structure of the 1:1:11 series had been synthesized, and characterized the structure by the foruier transform infrared spectroscopy (IR), ultraviolet spectra (UV) and X-ray diffraction (XRD).The thermal stability and the number of the crystal water was analyzed by the thermal gravimetric analysis/differential thermal analysis (TG/DTA). It was showed the molecular formula was Na5[Ce(ZrMo11O39)]•16H2O( Abbrev.CeZrMo),it possessed Keggin structure and had good thermal stability. The influences on the degradation rate, such as the amount of the CeZrMo, the initial concentration of the AGB dye wastewater, the ultrasonic frequency and power, were investigated. The results showed that the degradation rate could reach 88.01% after 60min irradiation, when the amount of the CeZrMo was 0.8g•L-1, the concentration of the AGB was 10mg•L-1, the ultrasonic frequency was 45kHz and the ultrasonic power was 100W.

Analysis Degradation Effect of Aniline Wastewater by Ultrasound

2013 ◽  
Vol 773 ◽  
pp. 923-926 ◽  
Author(s):  
Yong Guang Bi ◽  
Min Xia Huang
Keyword(s):  
Traditional Method ◽  
Degradation Rate ◽  
Ph Value ◽  
Irradiation Time ◽  
Ultrasonic Power ◽  
Solution Ph ◽  
Ultrasonic Time ◽  
Alkaline Conditions ◽  
Ultrasonic Degradation ◽  
Degradation Effect

aniline solution for the study, the effects of ultrasonic time, reaction factors such as temperature, ultrasonic power, and the pH of its ultrasonic degradation rate. Experimental results show that: as time increases, the ultrasonic degradation rate of aniline also rise, When the ultrasound the irradiation time 80min, aniline degradation rate reached 89.3%, 90min when the degradation rate of 92.1%, the degradation rate of aniline with decreases with the rise of the temperature of the solution, more than 40°C the degradation rate decreased significantly. Aniline degradation rate increased with the initial solution pH value increases, indicating that the alkaline conditions are favorable for degradation of aniline solution. Relative to the traditional method, the method is fast, simple, degradation rate, etc..

Ultrasonic Degradation of Dextran in Aqueous Solution

2011 ◽  
Vol 396-398 ◽  
pp. 1624-1627 ◽  
Author(s):  
Qing Song Zou ◽  
Yuan Yuan Pu ◽  
Su Xia Li ◽  
Qing Wang ◽  
Xiao Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Ultrasonic Treatment ◽  
Degradation Rate ◽  
Ultrasonic Power ◽  
Operational Parameters ◽  
Ultrasonic Device ◽  
Initial Stage ◽  
Ultrasonic Degradation

An ultrasonic device with frequency of 20 kHz was used to investigate the effect of different operational parameters such as ultrasonic power, temperature and initial molecular weight on dextran degradation. Results show that the molecular weight of dextran can be controlled by ultrasonic treatment. Higher the ultrasonic power and lower the temperature could increase the degradation rate (R).The initial molecular weight plays an important role in at the initial stage of dextran degradation (within 20 minutes). A smilar limiting molecular weight (Mw≈8.7×104) was obtained after 2 hours ultrasonic treatment for four different initial molecular weight dextrans, suggesting that the limiting molecular weight is independent on the initial molecular weight of dextran. Ultrasonic treatment can be used as a safe, simple and effective method to control the molecular weight of dextran.

Effects of Different Ultrasonic Frequency on Total Phenolic Contents of Extracts from Navel Orange Residue

2013 ◽  
Vol 830 ◽  
pp. 90-92
Author(s):  
Qing Cao
Keyword(s):  
Total Phenolic ◽  
Ultrasonic Frequency ◽  
Navel Orange ◽  
Ultrasonic Power ◽  
Citrus Peel ◽  
Phenolic Contents ◽  
Total Phenolic Contents ◽  
Ultrasonic Time ◽  
Ultrasonic Parameters

Effects of ultrasonic parameters (ultrasonic time, temperature and ultrasonic power) under different ultrasonic frequencies including 20, 60, 100 kHz on total phenolic contents (TPC) of extracts from citrus peel (CP) were analyzed. The results showed that TPC of extracts from CP increased significantly with increases of ultrasonic time, temperature and ultrasonic power under three ultrasonic frequencies.

Ultrasonic Degradation Performance of the NiZrMo Heteropoly Salt with Keggin Structure

2012 ◽  
Vol 178-181 ◽  
pp. 623-626
Author(s):  
Zhi Hong Zhang ◽  
Zhi Wei Guo
Keyword(s):  
Thermal Stability ◽  
Degradation Rate ◽  
Keggin Structure ◽  
Molecular Formula ◽  
Ultrasonic Frequency ◽  
Gravimetric Analysis ◽  
Ultrasonic Power ◽  
X Ray Diffraction ◽  
Crystal Water ◽  
Good Thermal Stability

A new heteropoly salt with Keggin structure of the 1:1:11 series had been synthesized, and characterized the structure by the foruier transform infrared spectroscopy (IR), ultraviolet spectra (UV) and X-ray diffraction (XRD).The thermal stability and the number of the crystal water was analyzed by the thermal gravimetric analysis/differential thermal analysis (TG/DTA). It was showed the molecular formula was Na6[Ni(ZrMo11O39)]•20H2O( Abbrev.NiZrMo),it possessed Keggin structure and had good thermal stability. The influences on the degradation rate, such as the amount of the NiZrMo, the initial concentration of the AGB dye wastewater, the ultrasonic frequency and power, were investigated. The results showed that the degradation rate could reach 90.19% after 60min irradiation, when the amount of the NiZrMo was 0.8g•L-1, the concentration of the AGB was 10mg•L-1, the ultrasonic frequency was 40kHz and the ultrasonic power was 80W.

scholarly journals Study on the Process of Degradation of Phenolic Compounds in Water by Slot Ultrasonic

2019 ◽  
Vol 118 ◽  
pp. 03050 ◽  
Author(s):  
Yong-guang Bi ◽  
Yu-hong Zheng ◽  
Shao-qi Zhou
Keyword(s):  
Wastewater Treatment ◽  
Phenolic Compounds ◽  
Industrial Wastewater ◽  
Degradation Rate ◽  
Sample Solution ◽  
Ultrasonic Power ◽  
Test Results ◽  
Industrial Wastewater Treatment ◽  
Initial Concentration ◽  
Ultrasonic Degradation

The test results show that the degradation rate of phenol decreases with the increase of ultrasonic power. The effect of degradation increases by studying the effects of the power of the ultrasonic, the initial concentration of the phenol sample solution, and the pH of the phenol sample solution. The degradation rate of phenol increases first and then decreases with the increase of initial concentration, and the degradation rate of phenol is up to 31.86%. The ultrasonic degradation technology can provide reference for the application of industrial wastewater treatment.

Ultrasonic degradation of 1-H-benzotriazole in water

2014 ◽  
Vol 70 (1) ◽  
pp. 152-159 ◽  
Author(s):  
Henry Zúñiga-Benítez ◽  
Jafar Soltan ◽  
Gustavo Peñuela
Keyword(s):  
Degradation Rate ◽  
Reaction Medium ◽  
Pollutant Removal ◽  
Bulk Solution ◽  
Interfacial Region ◽  
Oh Radicals ◽  
Ultrasonic Power ◽  
Bubble Liquid ◽  
Initial Concentration ◽  
Ultrasonic Degradation

This paper reports on the effect of different parameters of ultrasonic power, pollutant initial concentration, pH and the presence of co-existing chemical species (oxygen, nitrogen, ozone, and radical scavengers) on the ultrasonic degradation of the endocrine disruptor 1-H-benzotriazole. Increasing the 1-H-benzotriazole initial concentration from 41.97 to 167.88 μM increased the pollutant degradation rate by 40%. Likewise, a high applied ultrasonic power enhanced the extent of 1-H-benzotriazole removal and its initial degradation rate, which was accelerated in the presence of ozone and oxygen, but inhibited by nitrogen. The most favorable pH for the ultrasonic degradation was acidic media, reaching ∼90% pollutant removal in 2 h. The hydroxyl free radical concentration in the reaction medium was proportional to the ultrasound power and the irradiation time. Kinetic models based on a Langmuir-type mechanism were used to predict the pollutant sonochemical degradation. It was concluded that degradation takes place at both the bubble–liquid interfacial region and in the bulk solution, and OH radicals were the main species responsible for the reaction. Hydroxyl free radicals were generated by water pyrolysis and then diffused into the interfacial region and the bulk solution where most of the solute molecules were present.

scholarly journals Optimization of Ultrasonic-Assisted Extraction, Characterization, and Antioxidant Activities of Polysaccharides From Sojae Semen Praeparatum

2021 ◽  
Vol 16 (5) ◽  
pp. 1934578X2110206
Author(s):  
Yongshuai Jing ◽  
Ruijuan Zhang ◽  
Lan Li ◽  
Danshen Zhang ◽  
Yu Liu ◽  
...  
Keyword(s):  
Antioxidant Activities ◽  
Deae Cellulose ◽  
Chemical Compositions ◽  
Hydroxyl Groups ◽  
Ultrasonic Frequency ◽  
Ultrasonic Power ◽  
Assisted Extraction ◽  
Ultrasonic Time ◽  
Ultrasonic Assisted ◽  
Ultrasonic Assisted Extraction

In this study, response surface methodology (RSM) was used to optimize the ultrasonic-assisted extraction parameters of Sojae Semen Praeparatum polysaccharides (SSPP-80), the optimum conditions were determined as follows: ultrasonic frequency of 100 W, ultrasonic power of 80 Hz, ultrasonic temperature of 52℃, ultrasonic time of 23 minutes, and liquid to raw material ratio of 40 mL/g. Based on these conditions, polysaccharides extraction rate was 7.72% ± 0.26%. Then, 2 novel polysaccharides (SSPP-80‐1, SSPP-80‐2) were isolated from SSPP by DEAE-cellulose 52 chromatography. The chemical compositions, physicochemical properties, and structure of SSPPs were investigated by simultaneous thermal analyzer (TGA), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FI-IR), and high-performance liquid chromatography (HPLC). The results showed that SSPP-80 and 2 fractions were mainly composed of mannose (Man), glucose (Glc), galactose (Gal), xylose (Xyl), and arabinose (Ara). In addition, the antioxidant activities were evaluated against the DPPH and hydroxyl radical in vitro, the IC50 of SSPP-80, SSPP-80‐1 and SSPP-80‐2 against DPPH free radical were 4.407, 8.267, and 5.204 mg/mL, respectively, whereas the IC50values for removing hydroxyl groups were 5.318, 3.516, and 4.016 mg/mL, respectively. It demonstrated that SSPP-80 and 2 fractions had certain antioxidant activity. Theoretical basis for use of Sojae Semen Praeparatum polysaccharides was provided by this study.

Optimization of Chlorella pyrenoidosa Removal by Low Frequency Ultrasonic Irradiation Using Response Surface Design

2011 ◽  
Vol 295-297 ◽  
pp. 1860-1865 ◽  
Author(s):  
Zhi Zhang ◽  
Chao Liu ◽  
Gong Duan Fan ◽  
Jing Luo ◽  
Yan Dong Wang
Keyword(s):  
Response Surface ◽  
Irradiation Time ◽  
Removal Rate ◽  
Low Frequency ◽  
Chlorella Pyrenoidosa ◽  
Ultrasonic Frequency ◽  
Ultrasonic Power ◽  
Control Parameters ◽  
Single Factor ◽  
Surface Design

The control parameters of the removal of Chlorella pyrenoidosa, which was irradiated by low frequency ultrasonic, is optimized by using single factor experiments and response surface methodology (RSM). First of all, the approximate ranges of the ultrasonic frequency, the ultrasonic power and the irradiation time were estimated with single factor experiments for the further experiments. And then the optimized values of the three control parameters were determined, which were analyzed by using central composite design (CCD) and RSM. The results showed that the removal rate of chlorophyll-a could reach to 64.1% after the irradiation for 6.34min by using ultrasonic of 77.7 kHz and 250W. Ultrasonic technology can remove Chlorella pyrenoidosa cells in water quickly and effectively, so as to achieve the purpose of water purification.

Degradation of Phenol by Fe3+ Doped Nano-TiO2 Photocatalyst

2013 ◽  
Vol 859 ◽  
pp. 361-364 ◽  
Author(s):  
Jing Wang ◽  
Du Shu Huang ◽  
Wei Liu ◽  
Qing Shan Pan ◽  
Yong Min
Keyword(s):  
Degradation Rate ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Phenol Degradation ◽  
Nano Tio2 ◽  
Phenol Solution ◽  
Sol Gel Process ◽  
Two Peaks ◽  
Degradation Properties ◽  
Better Than

Degradation properties of phenol using nano-TiO2 as photocatalyst in aqueous solution were investigated. The effect of annealing temperature and ionic modification on the degradation was studied. The results showed that, 500 °C annealed TiO2 was better than 700 °C annealed. Photocatalyst nano-TiO2 material doped with Fe3+ was prepared quickly by sol-gel process and was used as photocatalyst to degrade phenol solution of 100mg/L under UV irradiation for 3 hours. UV spectrophotometer testing was made and found that two peaks at 210 nm and 270 nm were significantly become low, indicating that the phenol has been degraded. The phenol degradation rate was 94.18%.

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