Application of zeolite MCM-22 for basic dye removal from wastewater

Wang, Shaobin; Li, Huiting; Xu, Longya

doi:10.1016/j.jcis.2005.08.006

Cited by 379 publications

(187 citation statements)

References 30 publications

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“…27 This result coincides with the report by Dimitry that the length of a N-TiO 2 nanotube is proportional to the amount of TiO 2 powder used.…”

Section: Synthesis Of N-tio 2 Nanotubes (N-tnt) and Their Photocatalysupporting

confidence: 91%

Preparation of visible light sensitive nano-sized N-TiO$_{2}$ photocatalysts and their photocatalytic activity under visible light

Kang¹,

Lee²,

Hahm

2015

Turk J Chem

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Abstract:This study aimed to develop a photocatalyst that responds to visible light. For the preparation of visible light sensitive photocatalysts, N was doped into TiO 2 (N-TiO 2) . To inhibit the recombination of excited electrons and holes, transition metals (M = Pt, Cu, Fe, Cr) were loaded on the N-TiO 2 . N-TiO 2 nanotubes were also synthesized by a hydrothermal treatment of the prepared N-TiO 2 in a strong basic environment. The prepared photocatalysts were characterized by XRD, FESEM, HRTEM, XPS, and UV/VIS spectrophotometer, and their photocatalytic activity was tested by the photodecomposition of liquid-phase methylene blue and gas-phase acetone.

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“…27 This result coincides with the report by Dimitry that the length of a N-TiO 2 nanotube is proportional to the amount of TiO 2 powder used.…”

Section: Synthesis Of N-tio 2 Nanotubes (N-tnt) and Their Photocatalysupporting

confidence: 91%

Preparation of visible light sensitive nano-sized N-TiO$_{2}$ photocatalysts and their photocatalytic activity under visible light

Kang¹,

Lee²,

Hahm

2015

Turk J Chem

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“…3 displays the adsorption isotherms and dynamic curves of MB by HMZS, MZS and ZSM-5. The saturated adsorption amount of HMZS reaches as high as 101.4 mg g -1 , which is almost 6 and 5 times larger than those of ZSM-5 (17.6 mg g -1 ) and MZS (22.1 mg g -1 ), respectively, and such an adsorption capacity is even higher than that of natural sepiolite (58 mg g -1 ) 19 and MCM-22 zeolite (60 mg g -1 ), 20 indicating a remarkably better adsorption performance due to the large interior voids of the hollow spheres. Moreover, the adsorption dynamic curves demonstrate that almost 80% of the saturated adsorption amount can be adsorbed in less than 30 min and a saturated adsorption was achieved in 3 h for HMZS.…”

Section: 6mentioning

confidence: 84%

Hollow mesoporous zeolite microspheres: Hierarchical macro-/meso-/microporous structure and exceptionally enhanced adsorption properties

Zhou

Hua

et al. 2011

Dalton Trans.

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We report the synthesis of a new kind of uniform hollow zeolite microspheres with hierarchical macro-/meso-/ microporosity by an efficient strategy combining bitemplating, steam-assisted crystallization and then a mild alkaline etching method. This novel product has a hollow architecture, highly crystallized zeolite shells and more importantly, high dye adsorption capabilities.Hollow microspheres with various components, from carbon, metals and polymers to oxides, have drawn extensive attention for their applications in catalysis, microreactors and biomedicines, etc.1-3 Among them, hollow silica mesoporous microspheres (HMS), commonly with mesoporous shells, are greatly favored, due to their advantages in mass diffusion and transport by making use of their large cavity volumes and mesopore channels on the shells.3 However, in most available reports, the silica or silicate shells are amorphous which may limit further applications in severe circumstance.Zeolites are a series of crystalline aluminosilicates which have been widely used as catalysts and adsorbents in oil refining, separation and environmental fields, etc., due to their unique architecture, high hydrothermal stability and sufficient numbers of catalytically active sites.4 In recent years, there has been increasing interest in developing hollow structured zeolites (HSZs), such as hollow zeolite boxes and spheres.5-10 Since a layer-by-layer (LbL) technique based on electrostatic interaction or hydrogen bonding was reported by Caruso, 5 there have been several reports on the syntheses of HSZs using hard templates, applying LbL and/or secondary growth synthesis approaches. or vapor-phase treatment. 7 In these ways, the shells are built of well-intergrown crystals so as to improve the mechanical strength of the obtained HSZs. More recently, two unique techniques for HSZs preparation involving an in situ transformation of silica spheres into ZSM-5 zeolite 11 under the assistance of SDA and using oil/water emulsions as templates have been reported, respectively. However, most of the above-mentioned methods were subject to the use of pre-fabricated building units such as nanozeolites. Therefore the morphology and size of HSZs are highly dependent on the hard template and the subsequent LbL technique, which further involved complicated multistep and timeconsuming coating processes. More importantly, very few reports can be found focusing on HSZs with mesopores on the shells which, however, are greatly favoured due to their advantages in mass diffusion and the utilization of cavity volumes. 9Herein, hollow mesoporous zeolite microspheres (HMZS) with secondary mesopores on the shells were synthesized by an efficient post steam-assisted crystallization and mild alkaline etching approach (SAC-MAE). Herein, SAC and MAE have been demonstrated as effective routes to synthesize mesoporous zeolite structure (MZS) and hollow zeolite boxes, respectively, by us and other groups.10,12 This novel product possesses uniform size of ca. 700 nm, hollow architecture, highly crys...

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“…it is difficult to remove the dyes from effluent , because dyes are not easily degradable and are generally not removed from wastewater by conventional wastewater systems [4] Many physical and chemical processes for color removal have been applied including coagulation , flocculation , biosorption photo -decomposition and ultrafiltration, oxidizing agents and electrochemical . Adsorption process has been found to be an efficient and economic process to remove dyes, pigments and other colorants [5] .It is also has been found to be superior to other technique for wastewater treatment in terms of initial costs, simplicity of design, ease of operation and insensitivity to toxic substances, many kinds of adsorbents have been developed for various applications such as zeolite [6]. seprolite [7] Kaolin [8], activated carbon [9] , clinoptiloite [10] and raw red mud [11].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of azo-dye onto surfactant modified chromium contained leather waste

Mammar¹

2014

IOSRJAC

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Application of zeolite MCM-22 for basic dye removal from wastewater

Cited by 379 publications

References 30 publications

Preparation of visible light sensitive nano-sized N-TiO$_{2}$ photocatalysts and their photocatalytic activity under visible light

Preparation of visible light sensitive nano-sized N-TiO$_{2}$ photocatalysts and their photocatalytic activity under visible light

Hollow mesoporous zeolite microspheres: Hierarchical macro-/meso-/microporous structure and exceptionally enhanced adsorption properties

Characteristics of azo-dye onto surfactant modified chromium contained leather waste

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