Further reuse of phosphorus-laden biochar for lead sorption from aqueous solution: Isotherm, kinetics, and mechanism

Author(s):  
Lei Pei ◽  
Fan Yang ◽  
Xiaoyun Xu ◽  
Hongyan Nan ◽  
Xiangyang Gui ◽  
...  
1990 ◽  
Vol 55 (8) ◽  
pp. 1984-1990 ◽  
Author(s):  
José M. Hernando ◽  
Olimpio Montero ◽  
Carlos Blanco

The kinetics of the reactions of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione to form the corresponding monocomplexes have been studied spectrophotometrically in the range 5 °C to 16 °C at I 25 mol l-1 in aqueous solution. In the proposed mechanism for the two complexes, the enol form reacts with the metal ion by parallel acid-independent and inverse-acid paths. The kinetic constants for both pathways have been calculated at five temperatures. Activation parameters have also been calculated. The results are consistent with an associative activation for Fe(H2O)63+ and dissociative activation for Fe(H2O)5(OH)2+. The differences in the results for the complexes of heptanediones studied are interpreted in terms of steric factors.


2001 ◽  
Vol 123 (23) ◽  
pp. 5473-5481 ◽  
Author(s):  
Keith M. Davies ◽  
David A. Wink ◽  
Joseph E. Saavedra ◽  
Larry K. Keefer

1968 ◽  
Vol 72 (9) ◽  
pp. 3142-3148 ◽  
Author(s):  
Alfred V. Willi ◽  
Chong Min Won ◽  
Paul Vilk

2009 ◽  
Vol 7 (1) ◽  
pp. 52-57 ◽  
Author(s):  
Mark A. Russell ◽  
Andrew P. Laws ◽  
John H. Atherton ◽  
Michael I. Page

2021 ◽  
pp. 130424
Author(s):  
Yuyun Lu ◽  
Romy Dorothea Maria Vos ◽  
Yuyu Zhang ◽  
Molan Zhang ◽  
Yunjiao Liu ◽  
...  

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