Novel ZnFe2O4/TiO2/flake graphite composite as particle electrodes for efficient photoelectrocatalytic degradation of rhodamine B in water

2018 ◽  
Vol 2017 (3) ◽  
pp. 752-761
Author(s):  
Dan Jia ◽  
Jian Yu ◽  
Stephen M. Long ◽  
Hao L. Tang
Keyword(s):  
Rhodamine B ◽  
Air Flow ◽  
Cell Voltage ◽  
Order Rate Constant ◽  
Flake Graphite ◽  
Optimum Conditions ◽  
Solution Ph ◽  
Graphite Composite ◽  
Operating Variables ◽  
Photoelectrocatalytic Degradation

Abstract A novel ZnFe2O4/TiO2/flake graphite composite material was synthesized and used as particle electrodes in a photoelectrocatalytic (PEC) system to investigate the degradation of rhodamine B as a model dye pollutant in water. Results showed that a PEC process with the new composite evidently led to enhanced degradation of rhodamine B due to a synergistic effect of photocatalysis and electrocatalysis. Operating variables including electrolyte concentration, applied cell voltage, air flow, composite dosage, solution pH, and dye concentration were also found to play important roles in rhodamine B removal. A 99.0% removal efficiency was observed within 30 min of treatment under optimum conditions of 0.01 mol/L Na2SO4, applied cell voltage of 15 V, air flow of 20 mL/min, composite dosage of 10 g/L, solution pH of 2, and rhodamine B concentration of 20 mg/L, with a pseudo-first-order rate constant of 0.278 min−1. These findings could provide new insights into the development of efficient PEC technologies on degradation of residual dyes in water.

scholarly journals Facile Fabrication of Novel NiFe2O4@Carbon Composites for Enhanced Adsorption of Emergent Antibiotics

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6710
Author(s):  
Van Tan Lam ◽  
Thi Cam Quyen Ngo ◽  
Long Giang Bach
Keyword(s):  
Metal Organic Framework ◽  
Pharmaceutical Drugs ◽  
Optimum Conditions ◽  
Solution Ph ◽  
Antibiotic Drugs ◽  
Metal Organic ◽  
Facile Fabrication ◽  
Permissible Levels ◽  
Enhanced Adsorption ◽  
Quadratic Models

Water purification is becoming one of the most pertinent environmental issues throughout the world. Among common types of water pollution involving heavy metals, pharmaceutical drugs, textile dyes, personal care products, and other persistent organic pollutants, the pollution of antibiotic drugs is increasingly emerging due to their adverse effects on microorganisms, aquatic animals, and human health. Therefore, the treatment of such contaminants is very necessary to reduce the concentration of antibiotic pollutants to permissible levels prior to discharge. Herein, we report the use of NiFe2O4@C composites from a bimetallic-based metal-organic framework Ni-MIL-88B(Fe) for removal of ciprofloxacin (CFX) and tetracycline (TCC). The effect of production temperatures (600–900 °C), solution pH (2–10), NiFe2O4@C dose (0.05–0.2 g/L), concentration of antibiotics (10–60 mg/L), and uptake time (0–480 min) was investigated systematically. Response surface methodology and central composite design were applied for quadratic models to discover optimum conditions of antibiotic adsorption. With high coefficients of determination (R2 = 0.9640–0.9713), the proposed models were significant statistically. Under proposed optimum conditions, the adsorption capacity for CFX and TCC were found at 256.244, and 105.38 mg/g, respectively. Recyclability study was employed and found that NiFe2O4@C-900 could be reused for up to three cycles, offering the potential of this composite as a good adsorbent for removal of emergent antibiotics.

Lauric acid/bentonite/flake graphite composite as form-stable phase change materials for thermal energy storage

2020 ◽  
Vol 10 (2) ◽  
pp. 214-224 ◽  
Author(s):  
Songyang Liu ◽  
Jie Han ◽  
Qingjie Gao ◽  
Wenze Kang ◽  
Ruichen Ren ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Lauric Acid ◽  
Stable Phase ◽  
Impregnation Method ◽  
Flake Graphite ◽  
Graphite Composite

The main purpose of this paper was to synthesize a novel form-stable composite phase change material (PCM). Herein, bentonite-based PCMs were synthesized by impregnating Na-bentonite clay with lauric acid (LA) through a vacuum impregnation method. Flake graphite (FG) was used to enhance the thermal conductivity of the composite PCMs. In addition, FG also helped block the leakage of the PCMs. It is worth noting that with the addition of FG, the period of melting and solidifying of composite PCMs were decreased to some extent. Meanwhile, the thermal conductivity of the PCMs has been obviously improved. Moreover, the synthesized composite PCM exhibited a favorable performance of reliability after 200 thermocycling test. Hence, this study showed that the developed composite PCM has the potential to be applied in thermal energy storage systems.

Photoelectrocatalytic degradation of rhodamine B pollutant with a novel zinc phosphate photoanode

2021 ◽  
Vol 148 ◽  
pp. 200-209 ◽  
Author(s):  
A. Chennah ◽  
E. Amaterz ◽  
A. Taoufyq ◽  
B. Bakiz ◽  
Y. Kadmi ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Zinc Phosphate ◽  
Photoelectrocatalytic Degradation

scholarly journals Fabrication of novel particle electrode γ-Al2O3@ZIF-8 and its application for degradation of Rhodamine B

2019 ◽  
Vol 80 (1) ◽  
pp. 109-116 ◽  
Author(s):  
Liguo Zhang ◽  
Caixia Ma ◽  
Lei Liu ◽  
Jingshi Pan ◽  
Qilin Wang
Keyword(s):  
Surface Area ◽  
Removal Efficiency ◽  
Rhodamine B ◽  
Three Dimensional ◽  
Cell Voltage ◽  
Bet Surface Area ◽  
Order Kinetic ◽  
Zeolitic Imidazolate Framework ◽  
Crystallization Method ◽  
Order Kinetic Model

Abstract Due to the high Brunauer–Emmett–Teller (BET) surface area of zeolitic imidazolate framework (ZIF)-8, a secondary crystallization method was used to prepare a particle electrode of γ-Al2O3@ZIF-8. According to the results from a field emission scanning electron microscope (SEM) and X-ray diffractometer (XRD), the particle electrode of γ-Al2O3 was successfully loaded with ZIF-8, and the BET surface area (1,433 m2/g) of ZIF-8 was over ten times that of γ-Al2O3. The key operation parameters of cell voltage, pH, initial RhB concentration and electrolyte concentration were all optimized. The observed rate constant (kobs) of the pseudo-first-order kinetic model for the electrocatalytic oxidation (ECO) system with the particle electrode of γ-Al2O3@ZIF-8 (15.2 × 10−2 min−1) was over five times higher than that of the system with the traditional particle electrode of γ-Al2O3 (2.6 × 10−2 min−1). The loading of ZIF-8 on the surface of γ-Al2O3 played an important role in improving electrocatalytic activity for the degradation of Rhodamine B (RhB), and the RhB removal efficiency of the three-dimensional (3D) electrocatalytic system with the particle electrode of γ-Al2O3@ZIF-8 was 93.5% in 15 min, compared with 27.5% in 15 min for the particle electrode of γ-Al2O3. The RhB removal efficiency was kept over 85% after five cycles of reuse for the 3D electrocatalytic system with the particle electrode of γ-Al2O3@ZIF-8.

scholarly journals Effect of Triangular Baffle Arrangement on Heat Transfer Enhancement of Air-Type PVT Collector

2020 ◽  
Vol 12 (18) ◽  
pp. 7469
Author(s):  
Ji-Suk Yu ◽  
Jin-Hee Kim ◽  
Jun-Tae Kim
Keyword(s):  
Air Flow ◽  
Air Gap ◽  
Back Side ◽  
Cfd Analysis ◽  
Optimum Conditions ◽  
Transfer Enhancement ◽  
Pv Module ◽  
Computational Fluid Dynamics Cfd ◽  
Liquid Type ◽  
Gap Height

A Photovoltaic Thermal (PVT) Collector is a device that produces electricity and simultaneously uses a heat source transmitted to back side of the Photovoltaic (PV). The PVT collector is categorized into liquid-type and air-type according to the heating medium. As an advantage, air-type PVT system is easy to manage and can be directly used for heating purposes. The performance of air-type PVT collector is determined by various factors, such as the height of air gap and air flow path (by baffles) in the collector. Baffles are installed in the PVT collector to improve the thermal performance of the collector by generating turbulence. However, the air flow that affects the performance of the PVT collector can vary depending on the number and placement of the baffles. Thus, the flow design using baffles in the collector is important. In this study, the performance of an air-type PVT collector due to the arrangement of triangular baffles and air gap height at the back of the PV module is analyzed through a simulation program. For this purpose, Computational Fluid Dynamics (CFD) analysis was performed with an NX program to compare and analyze the optimum conditions to improve the performance of the collector.

Design and synthesis of a novel rhodamine-based chemosensor and recognition study to Fe3+

2016 ◽  
Vol 22 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Feifei Zhang ◽  
Qi Gao ◽  
Junxia Zhao ◽  
Man Ge ◽  
Yinjuan Bai
Keyword(s):  
Fluorescence Intensity ◽  
Rhodamine B ◽  
Association Constant ◽  
Color Change ◽  
Condensation Reaction ◽  
Crystal Data ◽  
Optimum Conditions ◽  
Design And Synthesis ◽  
Colorimetric Chemosensor ◽  
Binding Stoichiometry

AbstractA fluorescent and colorimetric chemosensor Rh1 for Fe3+ was synthesized by condensation reaction of rhodamine B hydrochloride and 2-aminothiazole, and its structure was confirmed by NMR, IR, HRMS and crystal data. Upon coordination with Fe3+ in CH3CN-H2O (1:1, v/v) solution, the spirolactam of Rh1 is opened, which results in a dramatic enhancement of fluorescence intensity as well as the color change of the solution. Most importantly, other metal ions show no obvious interference with the detection of Fe3+. Under the optimum conditions described, the fluorescence intensity is linearly proportional to the concentration of Fe3+ in the range of 2 μm ~ 7 μm. The Job’s plot indicates a 1:1 binding stoichiometry between Rh1 and Fe3+. The association constant (Ka) is 2.26 × 104m-1.

The improved photoelectrocatalytic degradation of rhodamine B driven by the half-rectified square wave

2013 ◽  
Vol 102 ◽  
pp. 375-380 ◽  
Author(s):  
Han Song ◽  
Jing Shang ◽  
Tong Zhu ◽  
Junhui Ye ◽  
Qian Li ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Square Wave ◽  
Photoelectrocatalytic Degradation

AIR CURTAIN INCINERATOR TESTS

1983 ◽  
Vol 1983 (1) ◽  
pp. 33-38
Author(s):  
Keith F. Kruk
Keyword(s):  
Flow Rate ◽  
Air Flow ◽  
Test System ◽  
Design Criteria ◽  
Front Wall ◽  
Water Spray ◽  
Air Flow Rate ◽  
Air Curtain ◽  
Operating Variables ◽  
Combustion Tests

ABSTRACT The use of an curtain incinerator to dispose of materials recovered from an oil spill was investigated for the Alaskan Beaufort Sea Oilspill Response Body (ABSORB). A series of combustion experiments was conducted in a prototype incinerator 10 feet wide by 10 feet long by 14 feet high. Combustion rates, emissions, and temperatures were monitored during the experiments. Operating variables investigated included air flow rate, direction of air into the combustion chamber, waste feed rate, water spray over the combustion zone, and the slant of the combustion chamber's front wall. Some of the major results were:Optimum air flow rate into the incinerator is 7,000 cubic feet per minute.The system performed satisfactorily at combustion rates exceeding 600 barrels per day.At 600 bbl/day, most emulsions burned with emissions less than 1 Ringelmann.Oil with 20-to-30 percent water burned most efficiently.Oil-saturated straw was consistently burned in the incinerator at measured emission levels of less than 1 Ringelmann.Combustion temperatures in the incinerator will exceed 2,000°F with an 18,500-Btu-per-pound oil. Included in this paper are details of the test system, results of combustion tests, and recommended design criteria for an arctic system.

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