Preparation of Magnetically Separable Composite Photocatalyst: Titania Coated Magnetic Activated Carbon

2015 ◽  
Vol 719-720 ◽  
pp. 145-156
Author(s):  
Qing Wei Zhang ◽  
Wei Xie ◽  
Bao Hong Shen ◽  
Qiang Xie ◽  
Xiao Liang Li
Keyword(s):  
Activated Carbon ◽  
Magnetic Particles ◽  
Sol Gel ◽  
Carbon Matrix ◽  
Phenol Removal ◽  
Step Method ◽  
Visible Absorption ◽  
Magnetic Activated Carbon ◽  
Magnetic Stability ◽  
Embedded Type

In the present work, the embedded-type TiO2/magnetic activated carbon (TiO2/MAC) photocatalysts were prepared. The MAC support was manufactured by one-step method and the TiO2coated on the surface of MAC was prepared by sol-gel method. Its crystalline structural properties, morphology, magnetic performances and pore texture were characterized by XRD, SEM, TEM, ultraviolet-visible absorption spectra (Uv-vis), vibrating sample magnetometry (VSM) and N2adsorption isotherm. Characterization results showed that TiO2was highly dispersed on the surface of MAC support in the form of anatase with a particle size of 10 nm. Obtained TiO2/MAC photocatalysts were applied to treatment of contaminant phenol in aqueous solution. The phenol removal percentage by TiO2/MAC photocatalyst is as high as 94% after three cycles. In addition, photocatalytic degradation of phenol in water was examined using TiO2/MAC photocatalysts. The results show that 4wt% Fe3O4was suitable to prepare the support of TiO2/MAC composite. The phenol removal percentage by TiO2/MAC photocatalyst is as high as 94% after three cycles. However, the adsorption capability of photocatalyst disappears after six cycles, while its phenol removal percentage via photodegradation is still as high as 60%. Meanwhile, the used TiO2/MAC photocatalyst after six cycles still maintains good magnetic stability because the majority of magnetic particles are embedded into the bulk of carbon matrix. And the embedded structure could still meet the requirement of magnetic separation by an external magnetic field.

scholarly journals Degradation of diuron by heterogeneous electro-Fenton using modified magnetic activated carbon as the catalyst

RSC Advances ◽  
2018 ◽  
Vol 8 (36) ◽  
pp. 19971-19978 ◽  
Author(s):  
Xi Wang ◽  
Kai Zhu ◽  
Xiaoyue Ma ◽  
Zhirong Sun ◽  
Xiang Hu
Keyword(s):  
Activated Carbon ◽  
Magnetic Particles ◽  
Magnetic Activated Carbon ◽  
System P ◽  
Fenton System

The magnetic particles were firstly coated with PTFE for the degradation of diuron in a heterogeneous electro-Fenton system.

scholarly journals Synthesis of Magnetic Activated Carbon Treated with Sodium Dodecyl Sulphate

2021 ◽  
Vol 29 (1) ◽  
Author(s):  
Palsan Sannasi Abdullah ◽  
Huda Awang ◽  
Jayanthi Barasarathi
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Iron Powder ◽  
Sodium Dodecyl Sulphate ◽  
Magnetic Particles ◽  
Sodium Dodecyl ◽  
Chemical Properties ◽  
Performance Study ◽  
Methylene Blue Adsorption ◽  
Magnetic Activated Carbon

Magnetic activated carbon (MAC) is found to be effective for the adsorption of methylene blue due to its physico-chemical properties such as strong adsorption of magnetization. The use of activated carbon (AC) for methylene blue adsorption was ineffective compared to MAC. MAC was prepared by incorporating different types of iron powder and chemicals [sodium dodecyl sulphate (SDS), citric acid (CA), dimethicone (D350), and epichlorohydrin (C3H5ClO)] to strengthen the magnetism and stabilize the MAC. The methylene blue test and iodine test were tested on different samples. Characterization test on physical and chemical properties was carried out using Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD). The yield of MAC was higher because of the addition of magnetic particles. The incorporation of magnetic particles had been proven by the SEM and XRD analysis that showed the presence of iron compound. The performance study of the adsorbent sample showed that MAC_A3II presented better qualities with highest removal percentage (98.81 % of removal) in methylene blue adsorption and low magnetic contact time that showed strong magnetism. MAC_A3II was prepared by incorporating iron powder and treated by using sodium dodecyl sulphate (SDS). Among all the adsorbent sample, MAC_B2III performed the weakest quality because the dye removal percentage was low, and the preparation process was complicated compared with others.

scholarly journals Synthesis of N-CNT/TiO2 composites thin films: surface analysis and optoelectronic properties

2020 ◽  
Vol 183 ◽  
pp. 05002 ◽  
Author(s):  
Hamza Belkhanchi ◽  
Younes Ziat ◽  
Maryama Hammi ◽  
Charaf Laghlimi ◽  
Abdelaziz Moutcine ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Analysis ◽  
Sol Gel ◽  
Careful Analysis ◽  
Optoelectronic Properties ◽  
Spectroscopic Techniques ◽  
Large Area ◽  
Visible Absorption ◽  
Temperature Solution ◽  
Good Agreement

In this study, we have investigated the surface analysis and optoelectronic properties on the synthesis of N-CNT/TiO2 composites thin films, using sol gel method for a dye synthetized solar cell (DSSC) which is found to be simple and economical route. The titanium dioxide based solar cells are an exciting photovoltaic candidate; they are promising for the realization of large area devices. That can be synthetized by room temperature solution processing, with high photoactive performance. In the present work, we stated comparable efficiencies by directing our investigation on obtaining Sol Gel thin films based on N-CNT/TiO2, by dispersing nitrogen (N) doped carbon nanotubes (N-CNTs) powders in titanium tetraisopropoxyde (TTIP). The samples were assessed in terms of optical properties, using UV—visible absorption spectroscopic techniques. After careful analysis of the results, we have concluded that the mentioned route is good and more efficient in terms of optoelectronic properties. The gap of “the neat” 0.00w% N-CNT/TiO2 is of 3eV, which is in a good agreement with similar gap of semiconductors. The incorporated “w%NCNTs” led to diminishing the Eg with increasing N-CNTs amount. These consequences are very encouraging for optoelectronic field.

Phenol removal via activated carbon from co-pyrolysis of waste coal tar pitch and vinasse

2021 ◽  
Vol 38 (1) ◽  
pp. 64-71
Author(s):  
Ming Gao ◽  
Xiaona Wang ◽  
Changlei Xia ◽  
Na Song ◽  
Yuhui Ma ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Coal Tar ◽  
Coal Tar Pitch ◽  
Phenol Removal ◽  
Waste Coal

scholarly journals TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1622
Author(s):  
Xiao-Pin Guo ◽  
Peng Zang ◽  
Yong-Mei Li ◽  
Dong-Su Bi
Keyword(s):  
Activated Carbon ◽  
Natural Organic Matter ◽  
Uv Light ◽  
Sol Gel ◽  
Light Irradiation ◽  
Nano Tio2 ◽  
Uv Light Irradiation ◽  
Adsorption Capacities ◽  
Taste And Odor ◽  
Composite Photocatalysts

2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO2-coated activated carbon (TiO2/PAC) has been synthesized using the sol-gel method. A new TiO2/PAC photocatalyst has been successfully employed in photodegradation of 2-MIB under UV light irradiation. In addition, the combined results of XRD, SEM-EDX, FTIR and UV-Vis suggested that the nano-TiO2 had been successfully loaded on the surface of PAC. Experimental results of 2-MIB removal indicated that the adsorption capacities of PAC for 2-MIB were higher than that of TiO2/PAC. However, in the natural organic matter (NOM) bearing water, the removal efficiency of 2-MIB by TiO2/PAC and PAC were 97.8% and 65.4%, respectively, under UV light irradiation. Moreover, it was shown that the presence of NOMs had a distinct effect on the removal of MIB by TiO2/PAC and PAC. In addition, a simplified equivalent background compound (SEBC) model could not only be used to describe the competitive adsorption of MIB and NOM, but also represent the photocatalytic process. In comparison to other related studies, there are a few novel composite photocatalysts that could efficiently and rapidly remove MIB by the combination of adsorption and photocatalysis.

scholarly journals Investigating the performance of agricultural wastes and their ashes in removing phenol from leachate in a fixed-bed column

2020 ◽  
Vol 81 (10) ◽  
pp. 2109-2126 ◽  
Author(s):  
Seyed Omid Ahmadinejad ◽  
Seyed Taghi Omid Naeeni ◽  
Zahra Akbari ◽  
Sara Nazif
Keyword(s):  
Activated Carbon ◽  
Large Scale ◽  
Fixed Bed ◽  
Walnut Shell ◽  
Continuous Systems ◽  
Phenol Removal ◽  
Adsorption Method ◽  
Fixed Bed Column ◽  
Saturation Time ◽  
Coconut Shell Activated Carbon

Abstract One of the major pollutants in leachate is phenol. Due to safety and environmental problems, removal of phenol from leachate is essential. Most of the adsorption studies have been conducted in batch systems. Practically, large-scale adsorption is carried out in continuous systems. In this research, the adsorption method has been used for phenol removal from leachate by using walnut shell activated carbon (WSA) and coconut shell activated carbon (CSA) as adsorbents in a fixed-bed column. The effect of adsorbent bed depth, influent phenol concentration and type of adsorbent on adsorption was explored. By increasing the depth of the adsorbent bed in the column, phenol removal efficiency and saturation time increase significantly. Also, by increasing the influent concentration, saturation time of the column decreases. To predict the column performance and describe the breakthrough curve, three kinetic models of Yon-Nelson, Adams-Bohart and Thomas were applied. The results of the experiments indicate that there is a good match between the results of the experiment and the predicted results of the models.

scholarly journals Preparation and Characterization of Visible-Light-Activated Fe-N Co-Doped TiO2and Its Photocatalytic Inactivation Effect on Leukemia Tumors

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Kangqiang Huang ◽  
Li Chen ◽  
Jianwen Xiong ◽  
Meixiang Liao
Keyword(s):  
Electron Microscope ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Light Therapy ◽  
Cell Counting ◽  
Visible Absorption ◽  
X Ray ◽  
Photocatalytic Inactivation ◽  
Inactivation Efficiency ◽  
Co Doped

The Fe-N co-doped TiO2nanocomposites were synthesized by a sol-gel method and characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), ultraviolet-visible absorption spectroscopy (UV-vis) and X-ray photoelectron spectroscopy (XPS). Then the photocatalytic inactivation of Fe-N-doped TiO2on leukemia tumors was investigated by using Cell Counting Kit-8 (CCK-8) assay. Additionally, the ultrastructural morphology and apoptotic percentage of treated cells were also studied. The experimental results showed that the growth of leukemic HL60 cells was significantly inhibited in groups treated with TiO2nanoparticles and the photocatalytic activity of Fe-N-TiO2was significantly higher than that of Fe-TiO2and N-TiO2, indicating that the photocatalytic efficiency could be effectively enhanced by the modification of Fe-N. Furthermore, when 2 wt% Fe-N-TiO2nanocomposites at a final concentration of 200 μg/mL were used, the inactivation efficiency of 78.5% was achieved after 30-minute light therapy.

Sign in / Sign up

Export Citation Format

Share Document