Treatment of synthetic dyes wastewater utilizing a magnetically separable photocatalyst (TiO2/SiO2/Fe3O4): Parametric and kinetic studies

Gad‐Allah, Tarek A.; Kato, Shigeru; Satokawa, Shigeo; Kojima, Toshinori

doi:10.1016/j.desal.2008.04.031

Cited by 77 publications

(32 citation statements)

References 25 publications

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“…However, in the process of attaining easy separation, the photocatalytic activity of the immobilised semiconductors decreased remarkably. This was due to a decrease in the surface area, poor interaction with the reaction medium, and limited exposure of the photocatalyst to light [72,73]. Since neither the photocatalytic activity nor the easy separation can be sacrificed, researchers turned their interests to magnetic nanoparticles as integral ingredients for developing photocatalysts, which were easily separated from water with an external magnetic field [74][75][76].…”

Section: Introductionmentioning

confidence: 99%

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Mamba

Mishra

2016

Catalysts

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Organic and inorganic compounds utilised at different stages of various industrial processes are lost into effluent water and eventually find their way into fresh water sources where they cause devastating effects on the ecosystem due to their stability, toxicity, and non-biodegradable nature. Semiconductor photocatalysis has been highlighted as a promising technology for the treatment of water laden with organic, inorganic, and microbial pollutants. However, these semiconductor photocatalysts are applied in powdered form, which makes separation and recycling after treatment extremely difficult. This not only leads to loss of the photocatalyst but also to secondary pollution by the photocatalyst particles. The introduction of various magnetic nanoparticles such as magnetite, maghemite, ferrites, etc. into the photocatalyst matrix has recently become an area of intense research because it allows for the easy separation of the photocatalyst from the treated water using an external magnetic field. Herein, we discuss the recent developments in terms of synthesis and photocatalytic properties of magnetically separable nanocomposites towards water treatment. The influence of the magnetic nanoparticles in the optical properties, charge transfer mechanism, and overall photocatalytic activity is deliberated based on selected results. We conclude the review by providing summary remarks on the successes of magnetic photocatalysts and present some of the future challenges regarding the exploitation of these materials in water treatment.

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Section: Introductionmentioning

confidence: 99%

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Mamba

Mishra

2016

Catalysts

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“…According to the structural model, several three-component magnetic photocatalysts were synthesized, such as g -Fe 2 O 3 /SiO 2 /TiO 2 (Chen and Zhao 1999 ;Chen et al 2001 ;Gao et al 2003 ;Tawkaew and Supothina 2008 ;Abramson et al 2009 ;Wang et al 2010 ) , Fe 3 O 4 /SiO 2 /TiO 2 (Beydoun et al 2002 ;Rose et al 2003 ;Watson et al 2005 ;Xu et al 2005Xu et al , 2008aSong and Gao 2007 ;Kurinobu et al 2007 ;Gad-Allah et al 2009 ;Wang et al 2009 ;Ye et al 2010 ) , MFe 2 O 4 /SiO 2 /TiO 2 (Shchukin et al 2004 ;Chung et al 2004 ;Fu et al 2005 ;Lee et al 2006 ;Xu et al 2007a, b ;Zhang et al 2009a ;Kostedt et al 2010 ) , and others (Belessi et al 2009 ;Li et al 2009 ;Chen et al 2009 ) . Their components are listed in Table 4.1 .…”

Section: Structure Of Magnetic Photocatalystsmentioning

confidence: 99%

Magnetic Nano-photocatalysts: Preparation, Structure, and Application

Liu

2011

Environmental Chemistry for a Sustainable World

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Photocatalytic degradation of organic pollutants using suspended and dispersed nanosemiconductor photocatalysts in wastewater has unique advantages including high activity, low cost, solar utilization, and complete mineralization. However recovery and reuse of photocatalysts are diffi cult because fi ne particles are easily discharged in the waterfl ow. Immobilization of photocatalysts on supports such as glass and zeolite decreases activities due to the low specifi c area and slow mass transfer. Furthermore, a large amount of photocatalysts will lead to color contamination if they are released at industrial scale. Therefore, it is necessary to develop photocatalysts with separation function for reusable and cyclic application. The concept of magnetic photocatalysts with separation function was raised to benefi t from high activity and enable nanosemiconductor photocatalysts to be reused.

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“…São observadas perdas de corantes têxteis durante os processos de fabricação e no processo de tingimento de peças de roupas promovendo cor intensa e toxicidade pelo lançamento de águas residuais em sistemas aquáticos (Khataee et al, 2009;Gad-Allah et al, 2009). Quando se trata de resíduos têxteis o problema se torna sério, porque eles são quimicamente e fotoliticamente estáveis, pois são produzidos para serem resistentes ao clima, luz, água e detergente.…”

Section: Introductionunclassified

DEGRADAÇÃO DE CORANTE TÊXTIL ATRAVÉS DE PROCESSO FOTO-FENTON HETEROGÊNEO SOBRE CATALISADOR MAGNÉTICO Ni0,2Cu0,3Zn0,5Fe2O4

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DANTAS²,

Cristina³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -Nesse trabalho foi estudado nanopartículas magnéticas do espinélio Ni0,2Cu0,3Zn0,5Fe2O4 química e termicamente estável como catalisador na degradação de corante têxtil em processo foto-Fenton heterogêneo. A característica magnética deste material possibilita a facilidade na recuperação do catalisador após o tratamento de efluente aquoso. A literatura pouco relata a utilização desse tipo de material com a finalidade de degradação de compostos tóxicos por geração de radical hidroxila (• OH) com catalisador heterogêneo. Os testes foram realizados em reator fotoquímico em batelada com lâmpada SunLight (OSRAM) para a fotodegradação do corante têxtil remazol preto B (RB5) na presença de H2O2 e catalisador. Foi realizado planejamento fatorial fracionado (3 3-1 ). Os resultados revelam que o melhor resultado foi obtido na condição com 28,7 mmol de H2O2/g de catalisador em pH 11, obtendo-se ~96% de degradação de corante RB5, em 10 minutos de reação.

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Treatment of synthetic dyes wastewater utilizing a magnetically separable photocatalyst (TiO2/SiO2/Fe3O4): Parametric and kinetic studies

Cited by 77 publications

References 25 publications

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Advances in Magnetically Separable Photocatalysts: Smart, Recyclable Materials for Water Pollution Mitigation

Magnetic Nano-photocatalysts: Preparation, Structure, and Application

DEGRADAÇÃO DE CORANTE TÊXTIL ATRAVÉS DE PROCESSO FOTO-FENTON HETEROGÊNEO SOBRE CATALISADOR MAGNÉTICO Ni0,2Cu0,3Zn0,5Fe2O4

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