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Ting Wang,Xiaoying Jin,Zuliang Chen,Mallavarapu Megharaj,Ravendra Naidu 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
This study concerns the removal of Pb(II) and Cr(III) using magnetite nanoparticles synthesized by coprecipitation methods with (NCM) or without (CM) nitrogen gas passing through. Removal of Pb(II) significantly decreased from 80.56 to 41.41% when Cr(III) was co-presented, while decrease of Cr(III) was negligible when Pb(II) was present, falling from 42.37 to 38.48%. The characterizations indicated that the removal mechanism occurred through adsorption rather than chemical redox reaction. A co-adsorption mechanism is based on Pb(II) involved surface complexation, while Cr(III) was firstly adsorbed onto magnetite, followed by a partially substitution of Cr(III) for Fe(III) in Cr-Fe3O4 through ion exchanges.
Removal of Cr(VI) from aqueous solution by surfactant-modified kaolinite
Xiaoying Jin,Mingqin Jiang,Jianhua Du,Zuliang Chen 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Removal of Cr(VI) from aqueous solution by hexadecyltrimethylammonium chloride (HDTMA) modified kaolinite (HMK) was investigated, where the maximum adsorptive capacity reached 27.8 mg/g Cr(VI) using HMK compared with only 0.7 mg/g using unmodified natural kaolinite (NK). The adsorption of Cr(VI) on HMK can be well described by the Langmuir isotherm, and the kinetic adsorption of Cr(VI) on both HMK and NK fitted a pseudo-second-order model. FTIR analysis showed that surface modified HDTMA was responsible for the high adsorptive capacity of Cr(VI). HMK was used to remove Cr(VI) from an electroplating wastewater.
Enhanced degradation of malachite by iron nanoparticles encapsulated in sodium alginate beads
Shenliang Zeng,Xiaoying Jin,Dharmarajan Rajarathnam,Zuliang Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Encapsulation of the Fe NPs was synthesized by tea extract and dispersed within sodium alginate beads(Fe-SA-B), and used the degradation of malachite (MG). The results showed that a 92.3% of MG wasremoved using Fe NPs encapsulated sodium alginate beads (SA-Fe-B), while only 52% of MG was removedby free Fe NPs. Kinetics studies showed that a pseudo-second-order model well described the adsorptionof MG using SA-Fe-B, indicating initial adsorption of MG onto calcium alginate beads followed bydegradation through SA-Fe-B. The reusability of SA-Fe-B showed that thefirst 3 cycles were degradedabout 85% of MG.
Li Huang,Yan Zhou,Xiangquan Guo,Zuliang Chen 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In this paper, the sorption of 2,4-DCP onto DK4 (modified with dioctadecyldimethylammoniumchloride(DDAC)) was 3–5 times more than when using Na-bentonite, while sorption of Pb(II) on DK4 was notdifferent from using Na-bentonite. Sorption isotherms for 2,4-DCP and Pb(II) were well described by theLangmuir isotherm (R2 > 0.99), while pseudo-second-order kinetic model provided good kinetic datafitting (R2 > 0.99). Furthermore, DK4 was characterized by SEM–EDS, XRD and FTIR, it is concluded thatthe co-sorption of 2,4-DCP and Pb(II) onto DK4 occurred through the partition mechanism for adsorbing2,4-DCP and the ion-exchange mechanism for the sorption of Pb(II).