Adsorption and Desorption Mechanisms of Methylene Blue Removal with Iron-Oxide Coated Porous Ceramic Filter

Fang-wen, LI; Wu, Xiaoai; Ma, Shengqian; Xu, Zhongjian; Liu, Wenhua; Liu, Fen

doi:10.4236/jwarp.2009.11006

Cited by 28 publications

(10 citation statements)

References 4 publications

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“…It then deposit and block the surface of iron thus giving low discoloration of MB in 100% Fe 0 system. The higher MB discoloration in Fe 0 /sand system compared 100% Fe 0 system is therefore probably due to the presence of sand which acted as a dispersant and limited clogging of iron corrosion products; creating more space for MB to react and also forming weak hydrogen bond with MB improving its discoloration [26]. Particularly, for solution containing HPO 4…”

Section: Resultsmentioning

confidence: 98%

Studying the Impact of Anions Pre-generated Iron Corrosion Products on the Efficiency of Contaminant Removal in Fe0/H2O Systems

Tsamo¹,

Meali²,

Assaouka³

2018

JESE-B

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The effects of Fe 0 pre-corrosion by water, bicarbonate, chloride, phosphate and sulfate on the efficiency of Fe 0 systems for water treatment were investigated. Batch experiments were conducted for a total duration of 72 days with MB (Methylene Blue) and MO (Methyl Orange). The efficiency of used Fe 0 was assessed by characterizing the extent of MB and MO discoloration, pH variation and amount of iron released as a function of anion type. Before dye addition, used Fe 0 in Fe 0 /sand and 100% Fe 0 systems was allowed to equilibrate with H 2 O or the anionic solution for 0 to 44 days. Pre-corrosion has low impact on MB discoloration but has negative impact on MO discoloration. Relative to the reference system (anion free system, H 2 O), all the tested anions enhanced MB discoloration but decreased that of MO. HPO 4 2and HCO 3 severely affects MO discoloration. The pH of the medium governs the discoloration with MB performing better at higher pH and MO doing same at lower pH. For MB, Fe 0 /sand system shows higher efficiency than 100% Fe 0 system. But the two systems show similar efficiency for MO. Results will help in the design and functioning of Fe 0 based filtration systems and other water treatment designs using Fe 0 .

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Section: Resultsmentioning

confidence: 98%

Studying the Impact of Anions Pre-generated Iron Corrosion Products on the Efficiency of Contaminant Removal in Fe0/H2O Systems

Tsamo¹,

Meali²,

Assaouka³

2018

JESE-B

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“…Three typical functional groups of ≡FeOH 2 + , ≡FeOH and ≡FeO - were generated and present on the surface of MPs [ 47 ]. These functional groups were mostly ionized to the negatively charged ≡Fe-O - at alkaline condition and showed weakly acidic ion exchange property.…”

Section: Resultsmentioning

confidence: 99%

“…Under alkaline conditions, it was attached by Na + to form ≡FeO-Na + through electrostatic forces [ 38 , 48 ]. Na + had relative lower affinity to the ≡Fe-O - functional group and the attached Na + could be favorably replaced by MB [ 37 , 47 ]. The possible reactions related to the MB adsorption are described below: …”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of a magnetic adsorbent from negatively-valued iron mud for methylene blue adsorption

Liu

Zhu

et al. 2018

PLoS ONE

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With increasing awareness of reduction of energy and CO2 footprint, more waste is considered recyclable for generating value-added products. Here we reported the negatively-valued iron mud, a waste from groundwater treatment plant, was successfully converted into magnetic adsorbent. Comparing with the conventional calcination method under the high temperature and pressure, the synthesis of the magnetic particles (MPs) by Fe2+/Fe3+ coprecipitation was conducted at environment-friendly condition using ascorbic acid (H2A) as reduction reagent and nitric acid (or acid wastewater) as leaching solution. The MPs with major component of Fe3O4 were synthesized at the molar ratio (called ratio subsequently) of H2A to Fe3+ of iron mud ≥ 0.1; while amorphous ferrihydrite phase was formed at the ratio ≤ 0.05, which were confirmed by vibrating sample magnetometer (VSM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). With the ratio increased, the crystalline size and the crystallization degree of MPs increased, and thus the Brunauer-Emmett-Teller (BET) surface and the cation-exchange capacity (CEC) decreased. MPs-3 prepared with H2A to Fe3+ ratio of 0.1 demonstrated the highest methylene blue (MB) adsorption of 87.3 mg/g and good magnetic response. The adsorption of MB onto MPs agreed well with the non-linear Langmuir isotherm model and the pseudo-second-order model. Pilot-scale experiment showed that 99% of MB was removed by adding 10 g/L of MPs-3. After five adsorption-desorption cycles, MPs-3 still showed 62% removal efficiency for MB adsorption. When nitric acid was replaced by acid wastewater from a propylene plant, the synthesized MPs-3w showed 3.7 emu/g of saturation magnetization (Ms) and 56.7 mg/g of MB adsorption capacity, 2.8 times of the widely used commercial adsorbent of granular active carbon (GAC). The major mechanism of MPs adsorption for MB was electrostatic attraction and cation exchange. This study synthesized a magnetic adsorbent from the negatively-valued iron mud waste by using an environment-friendly coprecipitation method, which had a potential for treatment of dye wastewater.

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“…As a result, the central aromatic ring containing the functional groups N and S breaks and the photo-generated H atoms are utilized in the formation of C-H and N-H bonds [44]. The hypochromic shift indicates the distortion of the geometry of methylene blue by the photocatalyst which may be occurred due to the surface ligand complex reaction between methylene blue and functional groups of the photocatalyst in addition to the physical adsorptions such as static adsorption and Vander Waals force adsorption [45]. The % of degradation is around 63% in the presence of photocatalyst and it is around 30.4% in the absence of the photocatalyst [46].…”

Section: Photocatalytic Dye Degradationmentioning

confidence: 98%

PTh-rGO-TiO2 nanocomposite for photocatalytic hydrogen production and dye degradation

Rajendran

Gurunathan

2016

Journal of Photochemistry and Photobiology A: Chemistry

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Adsorption and Desorption Mechanisms of Methylene Blue Removal with Iron-Oxide Coated Porous Ceramic Filter

Cited by 28 publications

References 4 publications

Studying the Impact of Anions Pre-generated Iron Corrosion Products on the Efficiency of Contaminant Removal in Fe0/H2O Systems

Studying the Impact of Anions Pre-generated Iron Corrosion Products on the Efficiency of Contaminant Removal in Fe0/H2O Systems

Synthesis and characterization of a magnetic adsorbent from negatively-valued iron mud for methylene blue adsorption

PTh-rGO-TiO2 nanocomposite for photocatalytic hydrogen production and dye degradation

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