Hexavalent chromium removal from aqueous medium by activated carbon prepared from peanut shell: Adsorption kinetics, equilibrium and thermodynamic studies

ALOthman, Zeid A.; Rahmat, Ali; Naushad, Mu.

doi:10.1016/j.cej.2012.01.048

Cited by 667 publications

(209 citation statements)

References 53 publications

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“…Çünkü adsorbanın yüzeyindeki fonksiyonel grupların iyonlaşması veya protonlanması sulu çözeltinin pH değeri ile yakından ilgilidir [23]. PMPPP ile Zn(II) adsorpsiyonu için optimal pH değerini belirlemek amacıyla değişik pH değerlerine ayarlanmış Zn(II) çözeltilerine 0,050 g PMPPP ilave edilmiş ve elde edilen karışım 120 dakika karıştırılmıştır.…”

Section: Ph Etkisi (Effect Of Ph)unclassified

Zn(II) İyonlarının Piromellitik Dianhidrit ile Modifiye Edilmiş Poliamin Poliüre Polimeri ile Adsorpsiyonu

et al. 2016

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ÖZBu çalışmada sulu çözeltilerden Zn(II) iyonlarının piromellitik dianhidrit ile modifiye edilmiş poliamin-poliüre polimeri (PMPPP) üzerine adsorpsiyonu incelenmiştir. Adsorpsiyon çalışmasına etkisi incelenen parametreler; pH, temas süresi, PMPPP dozu, Zn(II) başlangıç konsantrasyonudur. Langmuir ve Freundlich izoterm modelleri kullanılarak analiz edilen Zn(II) adsorpsiyonunun deneysel verileri, tek tabakalı adsorpsiyonu ifade eden Langmuir izotermi ile daha yüksek uyum göstermiştir. Langmuir izotermine göre Zn(II) iyonları için PMPPP'nin maksimum adsorpsiyon kapasitesi 119.1 mg g -1 olarak hesaplanmıştır. PMPPP ile Zn(II) iyonlarının adsorpsiyon kinetiği pseudo ikinci derece modeli ile uyumlu bulunmuştur. Zn(II) adsorpsiyonu için termodinamik hesaplar prosesin ekzotermik ve kendiliğinden gerçekleşme eğiliminde olduğunu göstermiştir.Anahtar Kelimeler: : Zn(II), adsorpsiyon, arıtma, poliamin-poliüre polimeri Adsorption of Zn(II) ıons with polyamine polyurea polymer modified with pyromellitic dianhydride ABSTRACT In this study, adsorption of Zn(II) ions from aqueous solutions was investigated using polyamine polyurea polymer modified with pyromellitic dianhydride (PMPPP). The parameters on the adsorption studies such as pH, contact time, PMPPP dose and initial concentration of Zn(II) were studied. The experimental data analyzed using Langmuir and Freundlich isotherm models were showed a higher compliance with the Langmuir isotherm representing the monolayer adsorption. Maximum adsorption capacity of PMPPP for Zn (II) ions was calculated to be 119.1 mg g -1 according to Langmuir isotherm. Adsorption kinetics of Zn(II) ions on PMPPP were found to consistent with second order model. Thermodynamic calculations showed that the process is exothermic and occurs spontaneously.

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Section: Ph Etkisi (Effect Of Ph)unclassified

Zn(II) İyonlarının Piromellitik Dianhidrit ile Modifiye Edilmiş Poliamin Poliüre Polimeri ile Adsorpsiyonu

et al. 2016

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“…Figure 9 and Table 3 (the values of C) suggested the linear portion of the curve does not pass through the origin. It may be concluded that the adsorption mechanism of this adsorbate is a rather complex process and that the intraparticle diffusion was not the only rate-controlling step (Al-Othman et al, 2012).…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…Pseudo-first-order, pseudo-second-order models, and the intraparticular diffusion model were tested for their abilities to describe the process of AuðS 2 O 3 Þ 3À 2 adsorption (Al-Othman et al, 2012;Duranog˘lu et al, 2012) Pseudo-first-order kinetic model : log q e À q t ð Þ¼log q e À k 1 2:303 t ð7Þ…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorption of gold from thiosulfate solutions with chemically modified activated carbon

et al. 2017

Adsorption Science & Technology

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Adsorption of the gold-thiosulfate complex ion (AuðS 2 O 3 Þ 3À 2 ) on silver ferrocyanide (AgFC)-impregnated activated carbon in aqueous solution has been studied in order to find an effectual adsorbent for the thiosulfate extracting gold from ores. This study was performed using AgFCimpregnated activated carbon (AC-Ag-R-FC: AC: activated carbon, Ag: silver nitrate, R: heating, FC: potassium ferrocyanide) and an artificial aqueous solution of AuðS 2 O 3 Þ 3À 2 . Gold-thiosulfate complex adsorption kinetics and isotherm studies were carried out at pH ¼ 9.0 on modified materials. It has been also found that the adsorption fits the intraparticle diffusion and Freundlich isotherm well. In order to understand the adsorption mechanism, raw and modified materials were characterized by N 2 adsorption-desorption measurements at 77 K, scanning electron microscopy and X-ray photoelectron spectroscopy. The maximum adsorption capability of AuðS 2 O 3 Þ 3À 2 on AC-Ag-R-FC is 3.55 kgt À1. Clearly, the extraordinary adsorption capacity of AC for AuðS 2 O 3 Þ 3À 2 offers a new approach to address challenging gold-thiosulfate complex separation and could promote the future development of thiosulfate leaching gold process.

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“…During the production of ACs, carbonization of a raw material, performed in the temperature range of 600-900°C under an inert atmosphere, is often followed by physical activation (for example, treatment with steam or CO 2 ) and/or chemical activation (for example, reaction with KOH, ZnCl 2 or H 3 PO 4 ), resulting in a development of surface area and pore volume of formed ACs as well as changes in their surface composition [14][15][16][17][18][19][20]. A majority of ACs is microporous solids with very narrow channels, which can cause diffusion limitations restricting an access to inner adsorption centres and making ACs unregenerable [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Influence of thermal treatment conditions on efficiency of PFA/MCM-48 composite and CMK-1 carbon replica in adsorption of volatile organic compounds

Machowski

Natkański

Białas

et al. 2016

J Therm Anal Calorim

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The mechanism of thermal degradation of poly(furfuryl alcohol) (PFA) deposited on the MCM-48 mesoporous silica was studied. The behaviour of the thin PFA film homogeneously dispersed on the silica surface (the material with the real PFA/MCM-48 mass ratio of 0.06) was compared to that of the 3D structure of PFA completely filling the MCM-48 channels (the material with the real PFA/MCM-48 mass ratio of 1.02). The progress of decomposition was controlled by thermogravimetry accompanied by infrared spectroscopy providing information on the composition of gaseous products evolved during the sample degradation. The thermal treatment of PFA/ MCM-48 composites at various temperatures in the range of 523-1323 K enabled us to synthesize two series of PFAderived carbon adsorbents: (1) containing the degraded PFA film supported on the mesoporous silica and (2) CMK-1 type carbon replicas, which were obtained by leaching of SiO 2 from the PFA/MCM-48 composite after the previous pyrolysis. The structural and textural properties of these materials were determined by powder X-ray diffraction, DRIFT spectroscopy and low-temperature nitrogen adsorption. Furthermore, the samples were tested as adsorbents of different volatile organic compounds (VOCs). The PFA/MCM-48 materials showed the high adsorption capacity only in the removal of polar molecules, whereas CMK-1 was effective in the elimination of linear alkanes and aromatic VOCs as well.

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Hexavalent chromium removal from aqueous medium by activated carbon prepared from peanut shell: Adsorption kinetics, equilibrium and thermodynamic studies

Cited by 667 publications

References 53 publications

Zn(II) İyonlarının Piromellitik Dianhidrit ile Modifiye Edilmiş Poliamin Poliüre Polimeri ile Adsorpsiyonu

Zn(II) İyonlarının Piromellitik Dianhidrit ile Modifiye Edilmiş Poliamin Poliüre Polimeri ile Adsorpsiyonu

Adsorption of gold from thiosulfate solutions with chemically modified activated carbon

Influence of thermal treatment conditions on efficiency of PFA/MCM-48 composite and CMK-1 carbon replica in adsorption of volatile organic compounds

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