Cellulose/Biochar Cryogels: A Study of Adsorption Kinetics and Isotherms

In this work, an electrochemically assisted coagulation for the removal of chromium from water has been studied using zinc as anode and galvanized iron as cathode. The effects of pH, current density, concentration of chromium, temperature, adsorption kinetics and isotherms on the removal of chromium were investigated. The results showed that the optimum removal efficiency of 96.5% was achieved at a current density of 0.2 A/dm2, at a pH of 7.0. First- and second-order rate equations, Elovich and intraparticle diffusion models were applied to study adsorption kinetics. The adsorption process follows second-order kinetics model with good correlation. An equilibrium isotherm was measured experimentally and the results were analyzed by the Langmuir, Freundlich and Dubinin-Redushkevich model using linearized correlation co-efficient. The Langmuir adsorption isotherm was found to fit the equilibrium data for chromium adsorption. Temperature studies showed that the adsorption was endothermic and spontaneous in nature.

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Adsorption Kinetics and Isotherms of Ag(I) and Hg(II) onto Silica Gel with Functional Groups of Hydroxyl- or Amino-Terminated Polyamines

Journal of Chemical & Engineering Data ◽

10.1021/je1009784 ◽

2011 ◽

Vol 56 (5) ◽

pp. 1982-1990 ◽

Cited By ~ 25

Author(s):

Rongjun Qu ◽

Minghua Wang ◽

Renfeng Song ◽

Changmei Sun ◽

Ying Zhang ◽

...

Keyword(s):

Functional Groups ◽

Silica Gel ◽

Adsorption Kinetics ◽

Kinetics And Isotherms

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Photocatalytic degradation of the herbicide imazapyr: do the initial degradation rates correlate with the adsorption kinetics and isotherms?

Catalysis Science & Technology ◽

10.1039/c7cy01903c ◽

2018 ◽

Vol 8 (4) ◽

pp. 985-995 ◽

Cited By ~ 14

Author(s):

M. Faycal Atitar ◽

Asmae Bouziani ◽

Ralf Dillert ◽

Mohamed El Azzouzi ◽

Detlef W. Bahnemann

Keyword(s):

Photocatalytic Degradation ◽

Adsorption Kinetics ◽

Probe Molecule ◽

Degradation Rates ◽

Langmuir Hinshelwood Mechanism ◽

Induced Changes ◽

Kinetics And Isotherms

The Langmuir–Hinshelwood mechanism applies to the photocatalytic degradation of imazapyr only when assuming the occurence of light-induced changes of the photocatalyst surface affecting the adsorption of the probe molecule.

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Adsorption kinetics and isotherms of bioactive antioxidant quercetin onto amino-functionalized silica nanoparticles in aqueous ethanol solutions

New Journal of Chemistry ◽

10.1039/c7nj01489a ◽

2017 ◽

Vol 41 (16) ◽

pp. 8451-8458 ◽

Cited By ~ 4

Author(s):

Masoud Ghanimati ◽

Morteza Jabbari ◽

Ali Farajtabar ◽

Sayyed Ahmad Nabavi-Amri

Keyword(s):

Silica Nanoparticles ◽

Rice Husk ◽

Adsorption Kinetics ◽

Aqueous Ethanol ◽

Low Cost ◽

Acid Leaching ◽

Functionalized Silica ◽

Different Temperatures ◽

Kinetics And Isotherms ◽

Functionalized Silica Nanoparticles

Nano-structural particles of silica were synthesized from low-cost rice husk by acid leaching and further annealing at different temperatures.

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Adsorption kinetics and isotherms of phosphate and its removal from wastewater using mesoporous titanium oxide

Membrane Water Treatment ◽

10.12989/mwt.2017.8.2.161 ◽

2017 ◽

Vol 8 (2) ◽

pp. 161-169 ◽

Cited By ~ 1

Author(s):

Kwanyong Lee ◽

Warangkana Jutidamrongphan ◽

Seokwon Lee ◽

Ki Young Park

Keyword(s):

Titanium Oxide ◽

Adsorption Kinetics ◽

Kinetics And Isotherms

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Removal of Tetracycline by Hydrous Ferric Oxide: Adsorption Kinetics, Isotherms, and Mechanism

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16224580 ◽

2019 ◽

Vol 16 (22) ◽

pp. 4580 ◽

Cited By ~ 3

Author(s):

Ji Zang ◽

Tiantian Wu ◽

Huihui Song ◽

Nan Zhou ◽

Shisuo Fan ◽

...

Keyword(s):

Adsorption Kinetics ◽

Ferric Oxide ◽

Photoelectron Spectroscopy ◽

Electrostatic Interactions ◽

Adsorption Process ◽

Inhibitory Effect ◽

Maximum Adsorption Capacity ◽

Hydrous Ferric Oxide ◽

X Ray ◽

Kinetics And Isotherms

The removal of tetracycline (TC) from solution is an important environmental issue. Here we prepared an adsorbent hydrous ferric oxide (HFO) by adjusting a FeCl3·6H2O solution to neutral pH. HFO was characterized by a surface area analyzer, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), and was used to remove TC from solution. The influence of pH, solid-to-liquid ratio, ionic type, and strength on TC removal was investigated. Adsorption kinetics and isotherms were also determined. HFO after adsorption of TC was analyzed by FTIR and XPS to investigate the adsorption mechanism. The results showed that the adsorption of TC increased from 88.3% to 95% with increasing pH (3.0–7.0) and then decreased. K+ ions had little effect on TC adsorption by HFO. However, Ca2+ and Mg2+ reduced the adsorption of TC on HFO. When the concentrations of Ca2+ and Mg2+ were increased, the inhibitory effect was more obvious. Pseudo-second-order kinetics and the Langmuir model fitted the adsorption process well. The maximum adsorption capacity of TC on HFO reached 99.49 mg·g−1. The adsorption process was spontaneous, endothermic, and increasingly disordered. Combination analysis with FTIR and XPS showed that the mechanism between TC and HFO involved electrostatic interactions, hydrogen interactions, and complexation. Therefore, the environmental behavior of TC could be affected by HFO.

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