The adsorption experiment was carried out on simulated wastewater of methyl orange,and Li+-doped TiO2 (Li-TiO2) material prepared by solid phase synthesis as adsorbent.The thermodynamics behavior and kinetics mechanism of methyl orange on Li-TiO2 were studied.The results showed that the adsorption capacity on Li-TiO2(1.0g/L)was up to 18.32mg/g,and the removal rate of methyl orange was up to 91.6% under the condition of 298K,atmospheric pressure,pH 6 and c0 of 20mg/L.Besides,the adsorption dynamics of methyl orange on the apparent of Li-TiO2 fitted the Lagergren Pseudo-first-order model which the adsorption rate constant (k1) and the apparent activation energy (Ea) of methyl orange on Li-TiO2 was 0.0189min-1 and -5.567kJ/mol respectively.It was a monolayer adsorption that the adsorption behavior obeyed the Langmuir and Freundlich equation.Furthermore,thermodynamic data (ΔH<0,ΔG<0 and ΔS>0) illustrated that the adsorption of methyl orange on Li-TiO2 was proved as a spontaneous exothermic process.To sum up,Li-TiO2 was really an excellent adsorbent for removing methyl orange in simulated wastewater.
Yang Xiumei, Zou Yong, Wang Qiqing, Ruan Yunfei
. Adsorption capacity of Li+-doped TiO2 for methyl orange wastewater[J]. New Chemical Materials, 2020
, 48(12)
: 209
-213
.
DOI: 10.19817/j.cnki.issn 1006-3536.2020.12.049
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