Kinetics of Cu(II) and fulvic acid adsorption on modified biochar derived from rice husk

2020 ◽  
Vol 189 ◽  
pp. 305-315
Author(s):  
Shuai Tang ◽  
Lujian Lin ◽  
Xuesong Wang ◽  
Anxin Feng ◽  
Xue Feng ◽  
...  
Keyword(s):  
Fulvic Acid ◽  
Rice Husk ◽  
Modified Biochar ◽  
Kinetics Of

scholarly journals Enhanced removal of hexavalent chromium by different acid-modified biochar derived from corn straw: behavior and mechanism

2020 ◽  
Vol 81 (10) ◽  
pp. 2270-2280
Author(s):  
Yonggang Xu ◽  
Tianxia Bai ◽  
Yubo Yan ◽  
Yunfeng Zhao ◽  
Ling Yuan ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Hydrogen Ion ◽  
Corn Straw ◽  
Order Model ◽  
Freundlich Model ◽  
X Ray ◽  
Modified Biochar ◽  
Before And After ◽  
Pseudo Second Order ◽  
Kinetics Of

Abstract It is of great significance to remove Cr(VI) from water as a result of its high toxicity. Biochar from corn straw was modified by different acids (HNO3, H2SO4 and H3PO4) to remove Cr(VI) from aqueous solution. To estimate the removal mechanisms of Cr(VI) by the acid-modified biochars, batch experiments were performed in the light of contact time, Cr(VI) concentration, and pH, and the characteristics of acid-modified biochars before and after Cr(VI) adsorption were investigated by Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectroscopy (XPS). The adsorption kinetics of Cr(VI) by acid-modified biochars were consistent with the pseudo-second-order model, and the adsorption isotherm obeyed the Freundlich model. Furthermore, the acid- modified biochars could supply more oxygen-containing functional groups (-COOH and -OH) as electron donor (e−) and hydrogen ion (H+) to enhance the reduction of Cr(VI) to Cr(III), resulting in enhanced removal of Cr(VI). HNO3-modified biochar exhibited the highest removal efficiency of Cr(VI). In general, the acid modifition of biochar was an effective method to increase the removal of Cr(VI).

scholarly journals Zinc Removal from Wastewater Using Hydrogel Modified Biochar

2014 ◽  
Vol 625 ◽  
pp. 842-846 ◽  
Author(s):  
Lamin Sanyang ◽  
Wan Azlina Wan Abdul Karim Ghani ◽  
Azni Idris ◽  
Ahmad Mansor
Keyword(s):  
Rice Husk ◽  
Kinetic Data ◽  
Ammonium Persulfate ◽  
Solution Ph ◽  
Experimental Conditions ◽  
Modified Biochar ◽  
Zinc Removal ◽  
Swelling Capacity ◽  
Pseudo Second Order ◽  
Rice Husk Biochar

In this study, hydrogel-(rice husk) biochar composite (HBC-RH) was prepared using acrylamide (AAm) as monomer, with N.N’-methylenebisacrylamide (MBA) as crosslinker, ammonium persulfate (APS) as initiator and rice husk biochar (RHB). The synthesized hydrogel-(rice husk) biochar composite was characterized for swelling capacity andthen utilized for the removal of zinc from wastewater. The optimum batch experimental conditions for this study were determined by evaluating the effect of solution pH, adsorbent dosage, adsorbate initial concentration and contact time. Langmuir isotherm best fitted the HBC-RH sorption of Zinc whereas the kinetic data were best described by pseudo second-order. The maximum monolayer sorption capacity of HBC-RH for zinc was 35.75mg/g.

Non-isothermal kinetics of pyrolysis of rice husk

2003 ◽  
Vol 406 (1-2) ◽  
pp. 1-7 ◽  
Author(s):  
L.T Vlaev ◽  
I.G Markovska ◽  
L.A Lyubchev
Keyword(s):  
Rice Husk ◽  
Isothermal Kinetics ◽  
Kinetics Of

scholarly journals Sorption kinetics of Zn (II) ion by thermally treated rice husk

2015 ◽  
Author(s):  
K. K. Ong ◽  
A. F. A. Tarmizi ◽  
Wan Yunus W. M. Z. ◽  
K. M. Safidin ◽  
A. Fitrianto ◽  
...  
Keyword(s):  
Rice Husk ◽  
Sorption Kinetics ◽  
Kinetics Of ◽  
Thermally Treated

The chlorination kinetics of rice husk

1991 ◽  
Vol 30 (10) ◽  
pp. 2241-2247 ◽  
Author(s):  
Jen Min Chen ◽  
Feg Wen Chang
Keyword(s):  
Rice Husk ◽  
Kinetics Of

The effect of superplasticizers on rheology and early hydration kinetics of rice husk ash-blended cementitious systems

2017 ◽  
Vol 150 ◽  
pp. 511-519 ◽  
Author(s):  
Nsesheye Susan Msinjili ◽  
Wolfram Schmidt ◽  
Berta Mota ◽  
Sarah Leinitz ◽  
Hans-Carsten Kühne ◽  
...  
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Hydration Kinetics ◽  
Early Hydration ◽  
Cementitious Systems ◽  
Kinetics Of

scholarly journals Kinetics of Adsorptive Removal of Drimarene Brilliant Red from Aqueous Solution Using Untreated Agricultural Residues

2016 ◽  
Vol 59 (1) ◽  
pp. 11-22
Author(s):  
Ch. Tahir Mehmood ◽  
Muhammad Arshad ◽  
Tayyab Ashfaq ◽  
Muhammad Bilal ◽  
Muhammad Shafiq ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rice Husk ◽  
Analytical Data ◽  
Particle Sizes ◽  
Order Model ◽  
Orange Peels ◽  
Pseudo Second Order ◽  
Initial Adsorption ◽  
Kinetics Of ◽  
Solution Kinetics

The potential of untreated banana and orange peels, and rice husk was tested for drimarenebrilliant red (DBR) dye removal from aqueous solution. Kinetics was also studied in a batch experiment.Dose of adsorbents varied from 6 to 12 g/L, particle sizes 0.2 and 0.8 mm and contact time 2–32 h. Highdose and small particle size favoured DBR removal efficiency significantly. The highest adsorption capacitywas shown by rice husk (10 mg/g), then orange peels (9 mg/g) and the lowest by banana peels (4 mg/g).Langmuir isotherm (R2=0.99) and pseudo-second order model (R2=0.99) depicted well the equilibriumand best explained the kinetics for rice husk, respectively. Initial adsorption appeared as pore diffusionin all the cases and film diffusion was controlling the rate, later on. Based upon the analytical data, a simplemodel has been presented that fitted best to describe rice husk adsorption kinetics.

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