scholarly journals Treatment of rhodamine B with cavitation technology: comparison of hydrodynamic cavitation with ultrasonic cavitation

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 5096-5106
Author(s):  
Yu-Fang Ye ◽  
Ying Zhu ◽  
Na Lu ◽  
Xin Wang ◽  
Zhi Su
Keyword(s):  
Rhodamine B ◽  
Ultrasonic Cavitation ◽  
Hydrodynamic Cavitation ◽  
Simulated Wastewater ◽  
Technology Comparison

This paper presents the use of hydrodynamic cavitation and ultrasonic cavitation technologies for treating rhodamine B (RhB) in simulated wastewater.

scholarly journals The removal of Rhodamine B by H2O2 or ClO2 combined with hydrodynamic cavitation

2019 ◽  
Vol 80 (8) ◽  
pp. 1571-1580
Author(s):  
Kun Wang ◽  
Ri-ya Jin ◽  
Yi-na Qiao ◽  
Zeng-di He ◽  
Ying Wang ◽  
...  
Keyword(s):  
Water Pollution ◽  
Human Health ◽  
Rhodamine B ◽  
Removal Rate ◽  
Hydrodynamic Cavitation ◽  
Operating Parameters ◽  
Initial Ph ◽  
The Individual ◽  
Better Than ◽  
Maximum Removal

Abstract Rhodamine B (RhB), widely used as an industrial dye, is a toxic organic that is hazardous to human health and can cause water pollution. In this study, the removal rate of RhB was investigated by the following methods: hydrodynamic cavitation (HC) operated individually, and HC combined with oxidants H2O2 or ClO2. The effect of different operating parameters including pressure (2–6 bar) and initial pH (2–8) on the extent of degradation was investigated using an orifice plate as the cavitation device to achieve maximum removal of RhB. Under the parameters of HC, the effect of different loadings was investigated: H2O2 (n(RhB):n(H2O2) was varied from 1:17.60 to 1:211.28) and ClO2 (n(RhB):n(ClO2) was varied from 1:8.87 to 1:177.53). A combination of cavitation and H2O2 or ClO2 resulted in degradations of 80.6% and 95.3%. The results indicated that the combination of HC and oxidants was better than the individual HC process for the degradation of RhB. When combining HC with H2O2 or ClO2, the synergistic coefficients of 62.54 and 74.79 were obtained. The combination of HC and ClO2 was proven to be more effective for the removal of RhB compared to HC alone and the hybrid process of HC and H2O2.

Adsorption of rhodamine B and Cr3+ ion onto graphene/chitosan composite

2020 ◽  
pp. 1-12
Author(s):  
Yanji Li ◽  
Meng Ni ◽  
Qiang He ◽  
Xiang Li ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Rhodamine B ◽  
Ph Value ◽  
Removal Rate ◽  
Ion Concentration ◽  
Particle Diffusion ◽  
Solution Ph ◽  
Magnetic Chitosan ◽  
Correlation Degree ◽  
Simulated Wastewater

Graphene and chitosan acted as the adsorbents for simulated wastewater with rhodamine B. The novel material produced by freeze-drying obviously outperformed graphene and chitosan in treating rhodamine B. Factors (e.g., contaminant concentration, reaction time, solution pH value, adsorption dose and temperature) overall impacted the adsorption. The optimal conditions for graphene-chitosan treatment of dyes included the concentration of pollutants at 400 mg/L, the dose of adsorbent as 5 mg, the solution pH at 4 and at 25∘C, and for 12 h, in which the maximal treatment amount reached 858.00 mg/g. The adsorption processes of Chitosan/graphene composites and magnetic Chitosan/graphene composites for simulated wastewater from Rhodamine B reactor followed Langmuir and Freundlich models, respectively. The in-particle diffusion model shows that the adsorption process of the composites for Rhodamine B simulated wastewater is not determined by either surface diffusion or in-particle diffusion. The magnetic Chitosan/graphene composites exhibit high recyclability, which can be respectively reused 3 times and 5 times and retain 80% adsorption capacity after being administrated with Rhodamine B simulated wastewater. By analyzing grey correlation degree, it is demonstrated that the concentration of pollutants and the reaction temperature critically affect the adsorption capacity. The electrochemical treatment with graphite rod for the Cr3+ was under the initial voltage of 30.6 V, at the pH of 5.59, and at the temperature of 18.5∘C; the removal rate of the samples was nearly 62.35% with the chromium ion concentration declined from 0.3333 g/L to 0.1255 g/L.

scholarly journals Research into ultrasoic and hydrodinamic cavitation phenomena in a hydraulic system

2021 ◽  
Vol 5 (1) ◽  
pp. 33-40
Author(s):  
Jaroslaw Stryczek ◽  
Piotr Antoniak ◽  
Michal Banas ◽  
Piotr Stryczek ◽  
Oleg Yakhno ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Experimental Tests ◽  
Ultrasonic Cavitation ◽  
Hydrodynamic Cavitation ◽  
Gear Pump ◽  
Visualization Method ◽  
Special System ◽  
Beneficial Effects ◽  
Transparent Objects ◽  
Flow Through

The article describes the course of the ultrasonic cavitation in a hydraulic tank and the hydrodynamic cavitation in a gear pump. The course of those phenomena was confirmed in experimental tests carried out with the use of a tank and a pump made of transparent plastics. It has been proved that the oscillator-cavitation system made according to the original project is useful to induce the phenomenon of ultrasonic cavitation. It has also been shown that the PIV visualization method, consisting in a special system of illuminating transparent objects and recording the flow through those objects with a fast camera, is useful for the studying of the cavitation phenomena. A visible interaction between the ultrasonic and the hydrodynamic cavitation was observed. The induction of ultrasonic cavitation in the tank causes degassing of the oil, and the degassed oil supplying the pump reduces the hydrodynamic cavitation in its internal channels and clearances. This is an example of beneficial effects of the ultrasonic cavitation on the operation of a pump and a hydraulic system. The presented work is an example of effective co-operation between the communities of Wroclaw University of Science and Technology and Igor Sikorsky Kiyv Politechnic Institute, National Technical University of Ukraine.

Enhancing the Degradation of Rhodamine B by Hydrodynamic Cavitation with CCl4 Augmentation

2013 ◽  
Vol 864-867 ◽  
pp. 1244-1252
Author(s):  
Shu Jun Zhang ◽  
Li Shen ◽  
Wen Juan Gong
Keyword(s):  
Rhodamine B ◽  
Ph Value ◽  
Fold Increase ◽  
Hydrodynamic Cavitation ◽  
Inlet Pressure ◽  
Kinetic Rate ◽  
Ph Values ◽  
First Order Kinetics ◽  
Kinetic Rate Constants ◽  
Degradation Reaction

The degradation of Rhodamine B, a common pollutant existing in industrial wastewater, has been explored using a hydrodynamic cavitation reactor combined with CCl4treatment. The effects of CCl4concentration, operating pH values, inlet pressure, initial temperatures and initial RhB concentration were investigated. The result shows that the removal of RhB increases from 70.78% to 80.38% with increasing CCl4concentrations during hydrodynamic cavitation. Degradation of RhB with CCl4treatment increased as the operating pH value and its initial concentration decreased, a 7-fold increase (from 0.22×102min1to 1.68×102min1) in the kinetic rate constants were found at pH values ranging from 4.0 to 2.0. In addition, RhB degradation with CCl4treatment increased as the inlet pressure and temperature increased. From the present work, we conclude that the RhB degradation reaction follows a pseudo-first-order kinetics, and the mechanisms of CCl4enhancement are subsequently discussed.

Sign in / Sign up

Export Citation Format

Share Document