qe and qt (mg/g) are the amount of Cu2+ adsorbed on the MgHAp/Fe3O4
(mg/g) when the adsorption reached equilibrium and time t (min), respectively.
k1 and k2 are the pseudo-first-order and pseudo-secondorder
rate constant (g/mg/min).
The linear fitting results of the two models at 25 °C were shown in
Fig. 3. It could be found that the pseudo-second-order kinetic model
gave a satisfactory fit to all of the experimental data according to R2
(0.99) from Table 1. This suggested that the rate-limiting step of this adsorption
system may be chemical adsorption or chemisorptions involving
valences forces through sharing or exchanging of electrons between
adsorbent and Cu2+, and because of this chemical interaction, MgHAp/
Fe3O4 in combination with Cu2+ was of stable chemical and physical
properties which would not cause secondary pollution to environment
[46,47]. In addition, adsorption reaction rate was mainly controlled by
surface reaction process, rather than mass transfer process. The largest
adsorbing capacity of MgHAp/Fe3O4 for Cu2+ was as high as 307 mg/g
qe and qt (mg/g) are the amount of Cu2+ adsorbed on the MgHAp/Fe3O4(mg/g) when the adsorption reached equilibrium and time t (min), respectively.k1 and k2 are the pseudo-first-order and pseudo-secondorderrate constant (g/mg/min).The linear fitting results of the two models at 25 °C were shown inFig. 3. It could be found that the pseudo-second-order kinetic modelgave a satisfactory fit to all of the experimental data according to R2(0.99) from Table 1. This suggested that the rate-limiting step of this adsorptionsystem may be chemical adsorption or chemisorptions involvingvalences forces through sharing or exchanging of electrons betweenadsorbent and Cu2+, and because of this chemical interaction, MgHAp/Fe3O4 in combination with Cu2+ was of stable chemical and physicalproperties which would not cause secondary pollution to environment[46,47]. In addition, adsorption reaction rate was mainly controlled bysurface reaction process, rather than mass transfer process. The largestadsorbing capacity of MgHAp/Fe3O4 for Cu2+ was as high as 307 mg/g
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