Adsorption of volatile organic compounds onto natural porous minerals

Zhang, Guangxin; Liu, Yangyu; Zheng, Shuilin; Hashisho, Zaher

doi:10.1016/j.jhazmat.2018.10.031

Cited by 155 publications

(50 citation statements)

References 45 publications

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Section: Resultssupporting

confidence: 91%

“…The possible reason is that the space of pores is filled with water clusters, and the adsorption sites are unavailable for adsorption of xylene and EA. Similar results have been observed for natural minerals by Zhang et al 14 and granular activated carbon by Liu et al 30 The influence of initial concentrations on the removal efficiency of sole xylene and EA is shown in Figs 2(e) and 2(f) respectively. The initial concentrations have an influence on the adsorptive removal of xylene or EA.…”

Section: Effects Of Key Parameters On Adsorption Performance Of Sole supporting

confidence: 86%

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Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

Sun

Yuan

Liu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND Only a few studies have focused on the purification of waste gas containing a mixture of volatile organic compounds (VOCs) with engineered biochar. The adsorption behaviors of gaseous xylene and ethyl acetate (EA) individually and in binary mixture onto porous biomass carbon foam pellets (BCFPs) were studied by static headspace gas chromatography. RESULTS The removal efficiency nearly reached 100% for 17.32 mg L−1 xylene and 18.02 mg L−1 EA within 120 min at a BCFP dosage of 0.2 g L−1, a temperature of 40 °C and a relative humidity of 30%. The adsorption behavior followed the pseudo‐second‐order kinetic model for single and binary mixtures of xylene and EA. The coexistence of xylene had considerable influence on the adsorption performance of EA, whereas the coexistence of EA exhibited minimal effect on the adsorption performance of xylene. The monolayer adsorption capacities of sole xylene and EA were 250.63 and 206.61 mg g−1 respectively. The total adsorption capacity reached 322.36 mg g−1 for the binary mixture, but the adsorption capacity for sole xylene and EA decreased because of competitive adsorption. The adsorption process was spontaneous and endothermic. Pore filling was involved in the adsorption of xylene and EA onto BCFPs. Meanwhile, xylene adsorption was involved in the hydrophobic interaction and π–π electron dispersion interaction. CONCLUSION BCFPs are an effective adsorbent for VOC adsorptive removal from waste gas. Competitive adsorption between xylene and EA on BCFPs was determined. Results indicated that the physicochemical properties of VOCs had an effect on the adsorption performance. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 91%

Section: Effects Of Key Parameters On Adsorption Performance Of Sole supporting

confidence: 86%

Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

Sun

Yuan

Liu

et al. 2020

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

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“…The Freundlich isothermal model was established on the basis of heterogeneous adsorption theory. there are different active sites on the surface of adsorbents, and they have different adsorption capacities . It is valid for multilayer adsorption, which is described as follows:

true prefixln q_{e} = prefixln K_{F} + \frac{1}{n} prefixln c_{e}

…”

Section: Resultsmentioning

confidence: 99%

Removal of Fluoride by Graphene Oxide/Alumina Nanocomposite: Adsorbent Preparation, Characterization, Adsorption Performance and Mechanisms

et al. 2020

ChemistrySelect

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GO/Al2O3 was successfully prepared by using hydrothermal method which was used to study the removing of fluoride from water. The characterization results of X‐ray diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared (FT‐IR) spectra indicated that γ‐Al2O3 had been modified onto GO nanosheets. The BET surface area of GO/Al2O3 is 326.22 m2 g−1 and the corresponding pore size center at 3.7 nm. A batch of fluoride adsorption experiments were employed to investigate the effects of various factors such as solution pH values, contact time, fluoride initial concentrations, temperature, adsorbent dose, co‐existing anions, and recycling on fluoride removal. The results showed that the adsorption capacity (4.68 mg g‐1) of GO/Al2O3 is higher than that of γ‐Al2O3 (3.04 mg g−1). In addition, the modified adsorbent had a wide range of pH applications. Adsorption kinetics is well represented by the pseudo‐second‐order model, which indicating the adsorption processes are involved in chemisorption with ion exchange. The influences of co‐existing anions on fluoride removal followed the decreasing order of PO43‐>HCO3‐>SO42‐>Cl‐>NO3‐, which was related to the charge and radius of ions. The recycle performance of GO/Al2O3 is not so good owing to the poor strength of GO during the cycle process. Fluoride adsorption onto GO/Al2O3 could be attributed to electrostatic attraction, ligand exchange, ion exchange and hydrogen‐bond interaction between fluoride and OH groups.

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“…Densitas (146)(147)(148)(149) 2,61 g/cm 3(150) Titik didih (151)(152)(153)(154) Titik leleh (155)(156)(157)(158) 1.085 °C; 1.985 °F; 1.358 K (dekomposisi) 652 °C; 1.206 °F; 925 K Kelarutan dalam air (159-161) Dalam pelarut lain 0,79 gr/100 mL (20 °C) 1,30 gr/100 mL (80 °C) Larut dalam asam nitrat Tidak larut dalam etanol Struktur kristal (123,162,163) Ortorombik…”

Section: Sifat Kimiaunclassified

SILVER SULFATE (Ag2SO4): MOLECULAR ANALYSIS AND ION TRANSPORT

Yurmaniati¹,

Zainul²

2018

Preprint

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Abstrak Perak sulfat merupakan garam anorganik dengan rumus Ag2SO4. Perak sulfat ini termasuk dalam senyawa ionic karena terdapat ikatan antara logam perak dengan spesi non logam sulfat. Perak sulfat memiliki. berat molekul yaitu 311,799 gr/mol dengan tampilan kristal tidak berwarna dan tidak mudah terbakar. Senyawa ini digunakan dalam penyepuhan perak (silver plating) dan pengganti tanpa noda untuk perak nitrat. Perak Sulfat mengalami interaksi molekul dalam pelarut Air. Tujuan penelitian ini adalah untuk mengetahui karakteristik molekul dan transpor ion Perak Sulfat. Metode yang digunakan dalam penelitian ini adalah penelusuran literatur dengan Endnote X7, pemodelan komputasi, dan perhitungan matematis. Data transpor ion Perak Sulfat yaitu dengan parameter konduktivitas, viskositas, mobilitas ion, dan daya hanyut menggunakan data hasil review beberapa jurnal penelitian yang berkaitan dengan Perak Sulfat sesuai tahapan pada fishbone. Secara termokimia, perak sulfat memiliki entalpi pembentukan standar, ΔfHo 298 -715 kJ/mol dan entropi molar standar, So298 16,74 kJ/mol. Kelarutan Perak Sulfat dalam air yaitu 0,79 gr/100 mL (20 o C) dan dapat larut juga dalam pelarut asam nitrat. Hasil penelitian konduktivitas larutan Ag2SO4 semakin meningkat seiring dengan kenaikan konsentrasi persen massa sesuai grafik hasil perhitungan. Energi optimasi MM2 Minimization, Optimasi MM2 Dynamics, dan Optimasi MM2 Properties berturut-turut yaitu 210. 2194 kcal/mol, 755. 377 kcal/mol, 216. 774 kcal/mol. Kecepatan hanyut molekul perak sulfat dengan potensial Ag2SO4 3,61 V dan jarak antara elektroda 1,5 cm yaitu 2, 407 V/cm. Kata kunci : Perak Sulfat, Interaksi molekul, Pemodelan I. IntroductionPerak sulfat (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) merupakan senyawa ion dari perak dengan rumus Ag2SO4, yang digunakan dalam penyepuhan perak (silver plating) dan pengganti tanpa noda untuk perak nitrat. Garam sulfat ini stabil di bawah kondisi penggunaan dan penyimpanan biasa, meskipun ia menjadi gelap pada pajanan terhadap udara atau cahaya. Perak Sulfat (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) mengalami interaksi molekul dalam pelarut Air. Berat molekul senyawa ini yaitu 311,799 gr/mol dengan tampilan kristal tidak berwarna. Kelarutannya dalam air 0,79 gr/100 mL (20 o C) dan dapat larut juga dalam pelarut asam nitrat. Secara termokimia, perak sulfat (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) memiliki entalpi pembentukan standar, ΔfHo298 -715 kJ/mol dan entropi molar standar, So298 16,74 kJ/mol. Perak sulfat (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) tidak mudah terbakar.Perak Sulfat (Ag2SO4) (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) memiliki konduktivitas (1)(2)(3)(4)(5)(6)(7)(8)(9)(10) . Besarnya nilai konduktivitas (1-10) ditentukan oleh konsentrasi elektrolit. Muatan dalam senyawa dapat dibawa dalam bentuk electron seperti logam atau biasanya digunakan ion positif dan ion negative seperti dalam larutan elektrolit dan leburan garam. Aliran listrik dapat ditemukan dalam suatu larutan karena terdapat di ...

show abstract

Adsorption of volatile organic compounds onto natural porous minerals

Cited by 155 publications

References 45 publications

Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

Coadsorption of gaseous xylene, ethyl acetate and water onto porous biomass carbon foam pellets derived from liquefied Vallisneria natans waste

Removal of Fluoride by Graphene Oxide/Alumina Nanocomposite: Adsorbent Preparation, Characterization, Adsorption Performance and Mechanisms

SILVER SULFATE (Ag2SO4): MOLECULAR ANALYSIS AND ION TRANSPORT

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