Magnetic modification of microporous carbon for dye adsorption

Kyzas, George Z.; Deliyanni, Eleni A.; Lazaridis, Nikolaos K.

doi:10.1016/j.jcis.2014.05.049

Cited by 79 publications

(48 citation statements)

References 40 publications

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“…This size is greater than reported for magnetite impregnated in the carbon matrix [35] may be due to the replacement of the smaller Fe 3+ ions (ionic radius 0.64 Å) by the larger Mn 2+ (ionic radius 0.80 Å) [36].…”

Section: Materials Characterizationmentioning

confidence: 57%

“…The saturation magnetization values, found to be rs = 0.1 emu g −1 and rs = 0.35 emu g −1 for NF and NFM impregnated carbons, respectively, are less than those for Fe3O4 nanoparticles (Ms = 58.94 emu g −1 ) [38], and bare Fe2MnO4 nanoparticles (Ms = 70 emu g −1 ) [39]. This decrease can be attributed to the existence of graphitic layers on the surface of magnetic nanoparticles [35]. Despite the lower values, it is sufficient for the magnetic separation and recovery of sorbents.…”

Section: Materials Characterizationmentioning

confidence: 87%

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Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides

et al. 2017

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Abstract:The presence of arsenic in water supplies is a major problem for public health and still concerns large parts of population in Southeast Asia, Latin America and Europe. Removal of arsenic is usually accomplished either by coagulation with iron salts or by adsorption with iron oxides or activated alumina. However, these materials, although very efficient for arsenic, normally do not remove other undesirable constituents from waters, such as chlorine and organo-chlorine compounds, which are the results of water chlorination. Activated carbon has this affinity for organic compounds, but does not remove arsenic efficiently. Therefore, in the present study, iron modified activated carbons are investigated as alternative sorbents for the removal of arsenic(V) from aqueous solutions. In addition, modified activated carbons with magnetic properties can easily be separated from the solutions. In the present study, a simple and efficient method was used for the preparation of magnetic Fe 3 (Mn 2+ )O 4 (M:Fe and/or Mn) activated carbons. Activated carbons were impregnated with magnetic precursor solutions and then calcinated at 400 • C. The obtained carbons were characterized by X-ray diffraction (XRD), nitrogen adsorption isotherms, scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), Fourier Transform Infrared Spectrometry (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements. Their adsorption performance for As(V) was evaluated. The iron impregnation presented an increase in As(V) maximum adsorption capacity (Q max ) from about 4 mg g −1 for the raw carbon to 11.05 mg g −1 , while Mn incorporation further increased the adsorption capacity at 19.35 mg g −1 .

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Section: Materials Characterizationmentioning

confidence: 57%

Section: Materials Characterizationmentioning

confidence: 87%

Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides

et al. 2017

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“…In the present study, based on our previous experience/knowledge in activated carbons and low-cost adsorbent materials [4,5,[13][14][15][16][17][18][19][20][21], activated carbons were produced from agricultural wastes by hydrothermal treatment of potato peels. All samples were activated using KOH at 400 °C.…”

Section: Introductionmentioning

confidence: 99%

Zero-Cost Agricultural Wastes as Sources for Activated Carbons Synthesis: Lead Ions Removal from Wastewaters

Kyzas

Mitropoulos

2018

EWaS3 2018

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Abstract:In the present study, activated carbons (PAC) were hydrothermally prepared with an environmental friendly preparation route after pyrolysis from biomass (specifically from agricultural (potato) peels). The prepared biochars were activated with potassium hydroxide (chemical activities). The preparation route had a strong impact on the pore structure of PAC. In addition, surface chemistry was also affected by the preparation and activation process. The adsorbent materials were also characterized by Scanning Electron Microscopy. The prepared activated carbons were used as adsorbents for the removal of lead ions. Batch experiments were performed to investigate the effect of physico-chemical parameters, such as pH, contact time, initial metal concentration and temperature. Equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The thermodynamic parameters such as the change of enthalpy (ΔH 0 ), entropy (ΔS 0 ) and Gibb's free energy (ΔG 0 ) of adsorption systems were also determined and evaluated.

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“…(2015), Kyzas, G. Z., Deliyanni, E. A., & Lazaridis, N. K. (2014)]. Kyzas ve arkadaşlarının [Kyzas, G. Z., Deliyanni, E. A., & Lazaridis, N. K. (2014)] rapor ettiğine göre; Fe3O4 ile modifiye edilmiş aktif karbon üzerine metilen mavisinin adsorpsiyon çalışmalarında 300 dakikaya kadar adsorpsiyonun çok hızlı gerçekleşmiş, 300 dakikadan sonra yavaşlamaya başlamış ve 1500. dakikada dengeye ulaşmıştır.…”

Section: Adsorpsiyon üZerine Sürenin Etkisiunclassified

The Use of Acrylamide-Crotonic Acid Nested Network Structured Hydrogels for Adsorption of the Methylene Blue

İnal¹,

Tunalı²,

Yi̇ği̇toğlu³

2017

Uluslararası Muhendislik Arastirma Ve Gelistirme Dergisi

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ÖzBu çalışmada akrilamid-krotonik asit hidrojelleri metilen mavisi boyasının gideriminde adsorban olarak kullanılmıştır. Boyanın adsorpsiyonuna pH'nın, krotonik asit yüzdesinin, başlangıç boya derişiminin ve tekrar kullanım sayısının etkisi araştırılmıştır. Yalnızca akrilamidle hazırlanan hidrojellerde pH'nın artması ile adsorpsiyonda bir miktar artış görülmüştür. Akrilamid-krotonik asit hidrojellerinde pH 7, 9 ve 10'da adsorpsiyon hemen hemen yakın bulunmuş, buna karşılık pH 8'de belirgin bir azalma gözlenmiştir. Hidrojellerde bulunan krotonik asit yüzdesinin artması ile adsorpsiyon belirgin bir şekilde artmıştır. Ayrıca adsorbsiyon-desorpsiyon çalışmaları sonucu göstermektedir ki, 20 kere tekrar kullanımdan sonra bile hidrojellerin adsorpsiyon kapasitesi hemen hemen hiç azalmamıştır. Sonuçlar akrilamid-krotonik asit hidrojellerin endüstriyel ölçekte tekstil atık sularından boyaların gideriminde adsorban olarak kullanılabileceğini göstermektedir. Anahtar Kelimeler"akrilamid, krotonik asit, hidrojel, metilen mavisi, adsorpsiyon, tekstil" AbstractIn this study acrylamide-crotonic acid hydrogels are used as adsorbent for removal of methylene blue. The effects of pH, crotonic acid percentage, initial dye concentration and reusage number on the adsorption of the dye are investigated. When the pH increased adsorption also slightly increased with the hydrogels made up of only acrylamide. With the acrylamide crotonic acid hydrogels adsorption rates are similar in pH 7,9 and 10 but there is a significant decrease in pH 8. Adsorption increases with the increasing crotonic acid percentage in hydrogels. In addition, the adsorption-desorption results showed that the adsorption capacity of the hydrogel was not changed even after 20 times repeated use. Results show that acrylamide-crotonic acid hydrogels can be used as adsorbent for dye removal in industrial textile waste water.

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Magnetic modification of microporous carbon for dye adsorption

Cited by 79 publications

References 40 publications

Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides

Adsorption of Arsenate by Nano Scaled Activated Carbon Modified by Iron and Manganese Oxides

Zero-Cost Agricultural Wastes as Sources for Activated Carbons Synthesis: Lead Ions Removal from Wastewaters

The Use of Acrylamide-Crotonic Acid Nested Network Structured Hydrogels for Adsorption of the Methylene Blue

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