Simultaneous removal of Pb2+, Cu2+, Zn2+ and Cd2+ from highly acidic solutions using mechanochemically synthesized montmorillonite–kaolinite/TiO2 composite

Đukić, Anđelka; Kumrić, Ksenija; Vukelić, N.; Dimitrijević, Mirjana; Baščarević, Zvezdana; Kurko, Sandra; Matović, Ljiljana

doi:10.1016/j.clay.2014.10.021

Cited by 75 publications

(9 citation statements)

References 56 publications

(78 reference statements)

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“…In Cr(VI)-Cu(II) solution, the zeta potential of kaolin was still negatively charged after adsorbing ions ( Figure 6(b)). Therefore, the negatively charged adsorption sites of the kaolin surfaces were occupied by Cu 2+ through electrostatic attraction [42], decreasing the adsorption site on kaolin surface, thus reducing the adsorption of Cr(VI). However, Xu et al reported that Cu(II) could promote the adsorption of Cr(VI) on red soils [21], which was contrary to our result.…”

Section: Effects Of Ph Onmentioning

confidence: 99%

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Liu

et al. 2016

Journal of Chemistry

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The adsorption of Cr(III) or Cr(VI) in the absence and presence of Cu(II) onto kaolin was investigated under pH 2.0–7.0. Results indicated that the adsorption rate was not necessarily proportional to the adsorption capacity. The solutions’ pH values played a key role in kaolin zeta potential(ζ), especially the hydrolysis behavior and saturation index of heavy metal ions. In the presence of Cu(II),qmixCr(III)reached the maximum adsorption capacity of 0.73 mg·g−1at pH 6.0, while the maximum adsorption capacity for the mixed Cr(VI) and Cu(II) system (qmixCr(VI)) was observed at pH 2.0 (0.38 mg·g−1). Comparing the adsorption behaviors and mechanisms, we found that kaolin prefers to adsorb hydrolyzed products of Cr(III) instead of Cr3+ion, while adsorption sites of kaolin surface were occupied primarily by Cu(II) through surface complexation, leading to Cu(II) inhibited Cr(VI) adsorption. Moreover, Cr(III) and Cr(VI) removal efficiency had a positive correlation with distribution coefficientKd. Cr(III) and Cr(VI) removal efficiency had a positive correlation with distribution coefficientKdand that of adsorption affinities of Cr(III) or Cr(VI) on kaolin was found to beKdCr(III) <KdCr(III)-Cu(II) andKdCr(VI) >KdCr(VI)-Cu(II).

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Section: Effects Of Ph Onmentioning

confidence: 99%

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Liu

et al. 2016

Journal of Chemistry

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“…Numerous studies focused on adsorbent preparation and adsorption process, such as using TiO 2 and Al 2 O 3 nanoparticles (NPs) as adsorbents [2,[9][10][11][12][13][14][15]. TiO 2 was proven to have a high removal capability because of its promising properties, such as biological and chemical inertness, high adsorption capacity, photoactivity, and environment-friendly [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of metal and metalloid ions onto nanoporous microparticles functionalized by atomic layer deposition

Wang

Donovan

Patel

et al. 2016

Journal of Environmental Chemical Engineering

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A novel material was prepared by depositing ultrathin TiO 2 films on nanoporous micron-sized silica gel particles by atomic layer deposition (ALD). Silica gel particles were coated with 20 and 40 cycles of TiO 2 films by ALD. Half samples were heated at 500 ºC to change the crystal structure of TiO 2. Their adsorption ability for a mixture of 19 trace elements of heavy metals and other toxic elements, including As(

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“…Although many different methods such as chemical precipitation [7,16], ion exchange [17], solvent extraction [18,19], reverse osmosis [20], dialysis/electrodialysis [21], supported liquid membrane [22] and adsorption [23][24][25] have been documented for the removal of heavy metal ions, the process based on adsorption methods is promising, due to its low cost and high removal efficiency [26]. Many low-cost materials [27][28][29][30][31][32][33][34][35][36] have been reported for Cd(II) removal from water and wastewater systems, but they are not very popular because of various limitation like cost, removal efficiency and maintenance.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Equilibrium and kinetic studies of Cd(II) ion adsorption from aqueous solution by activated red mud

Sahu

Mandal

Yadav

et al. 2015

Desalination and Water Treatment

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Red mud is an undesirable by-product of bauxite in Bayer process has been used as a low-cost adsorbent for the removal of Cd(II) from aqueous solution by batch mode of experiment. The red mud was activated by acid dilution followed by ammonia precipitation for better adsorption of Cd(II). To achieve optimum condition for adsorption, different variable parameters were studied. X-ray diffraction, SEM and EDX were used to characterize the adsorbent before and after cadmium adsorption. The maximum adsorption capacities of Cd(II) on activated red mud (ARM) were found to be 12.046 and 12.548 mg g −1 at temperature 293 and 303 K, respectively. Adsorption data of Cd(II) are best fitted to linearly transformed Langmuir isotherm with R 2 > 0.99. The pseudo-second-order model describes the kinetics of Cd(II) adsorption successfully to predict the rate constant of adsorption. Thermodynamic parameters reveal the endothermic, spontaneous and feasible nature of adsorption of Cd(II) onto ARM. The mass transfer study led to compute the external mass transfer coefficient (k f ) by the equation of McKay et al. and Weber-Mathews at temperature 293 and 303 K. The desorption efficiency of Cd(II) ions from ARM was 91.29% using 0.2-mol L −1 HCl.

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Simultaneous removal of Pb2+, Cu2+, Zn2+ and Cd2+ from highly acidic solutions using mechanochemically synthesized montmorillonite–kaolinite/TiO2 composite

Cited by 75 publications

References 56 publications

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Adsorption of metal and metalloid ions onto nanoporous microparticles functionalized by atomic layer deposition

Equilibrium and kinetic studies of Cd(II) ion adsorption from aqueous solution by activated red mud

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