Simultaneous sorption of phosphate and phenanthrene to inorgano–organo-bentonite from water

Ma, Jianfeng; Zhu, Lizhong

doi:10.1016/j.jhazmat.2006.01.046

Cited by 85 publications

(21 citation statements)

References 37 publications

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“…The results indicated that a greater proportion of the added P was sorbed at low P concentrations by above adsorbents. Some researchers used clays for P removal from aqueous solution having high P concentration (Yan and Xu 2010;Ma and Zhu, 2006). Therefore, it is seems necessary to develop an adsorbent with high affinity for P sorption that can remove P at the lower concentrations (Zamparas et al 2012).…”

Section: Sorption and Desorption Isothermsmentioning

confidence: 99%

Use of modified clays for removal of phosphorus from aqueous solutions

Moharami

Jalali

2015

Environ Monit Assess

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Phosphorus (P) removal from aqueous solutions was investigated using modified bentonite, calcite, kaolinite, and zeolite with FeCl3, CaCl2, and NaCl. The maximum sorption capacity of P was obtained by modified adsorbents with Fe(3+) ions (Fe-adsorbents). The results showed that P sorption capacity by Fe-adsorbents (bentonite (1.31 mg g(-1)), calcite (1.97 mg g(-1)), kaolinite (1.31 mg g(-1)), and zeolite (1.58 mg g(-1))) was improved by ∼467, 107, 409, and 427 %, respectively, compared to unmodified adsorbents (bentonite (0.28 mg g(-1)), calcite (1.82 mg g(-1)), kaolinite (0.32 mg g(-1)), and zeolite (0.37 mg g(-1))). Sorption isotherms were well described by the Freundlich model. Desorption experiments showed that the desorption capacity was in order of unmodified adsorbents > modified adsorbents with Na(+) ions (Na-adsorbents) > modified adsorbents with Ca(2+) ions (Ca adsorbents) > Fe-adsorbents. Effect of pH and ion strength was also investigated. At different pH, changes in the ionic strength had little effect on the adsorption. Results showed that double-layer model (DLM) could model P adsorption onto modified adsorbents over a wide range of pH and varying ionic strength. According to the scanning electron microscopy (SEM) images and saturation indices (SIs), high P removal by adsorbents was partly due to the P precipitation.

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Section: Sorption and Desorption Isothermsmentioning

confidence: 99%

Use of modified clays for removal of phosphorus from aqueous solutions

Moharami

Jalali

2015

Environ Monit Assess

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“…They can also serve as high capacity -selectivity and recyclable ligands for toxic metal ions, radionuclides, organic and inorganic solutes [29]. Therefore water treatment based on the adsorption of contaminants using nanomaterials, such as cerium oxide or iron oxide-based nanoparticles, is relatively useful and cost effective method for water contaminants [30,31,32,33,34,35,36,37,38,39,40,41,42,43] and also for phosphate removal [30,31,33,34,35,36,38,39,40,41,43]. Adsorption is generally used to remove organic [44] and inorganic contaminants such as heavy metals [45] from water and wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Phosphate removal and recovery from water using nanocomposite of immobilized magnetite nanoparticles on cationic polymer

Markeb

Alonso

Dorado

et al. 2016

Environmental Technology

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Highlights• Immobilization of magnetite nanoparticles on cationic polymer was synthesized.• Phosphate removal using magnetite based nanocomposites was tested.• Adsorption isotherms of phosphate at two pH; 5 and 7 were performed.• Different isotherms models were applied for experimental data fitting.• Regeneration and reusability of the magnetite based nanocomposites were carried out. Graphical Abstract 2 AbstractA novel nanocomposite based on magnetite nanoparticles (Fe3O4-NPs) immobilized on the surface of the cationic exchange polymer, C100, using a modification of the coprecipitation method was developed to obtain magnetic nanocomposites (NCs) for phosphate removal and recovery from water. High resolution TEM-EDS, SEM, XRD, and ICP-OES were used to characterize the NCs. The continuous adsorption process by the so-called breakthrough curves was used to determine the adsorption capacity of the Fe3O4 based NC. The adsorption 3 capacity conditions were studied under different conditions (pH, phosphate concentration and concentration of NPs). The optimum concentration of iron in the NC for phosphate removal was 23.59 mgFe/gNC. The sorption isotherms of this material were performed at pHs 5 and 7.Taking into account the real application of this novel material in real water, the experiments were performed at pH 7, achieving an adsorption capacity higher than 4.9 mgPO4-P/gNC.Moreover, Freundlich, Langmuir and a combination of them fit the experimental data and were used for interpreting the influence of pH on the sorption and the adsorption mechanism for this novel material. Furthermore, regeneration and reusability of the nanocomposite were tested obtaining 97.5 % recovery of phosphate for the first cycle and at least 7 cycles of adsorptiondesorption were carried out with more than 40% of recovery. Thus, this work described a novel magnetic nanoadsorbent with promoting properties for phosphate recovery in wastewater.

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“…The increase of the specific surface area indicated the innersurfaces and regions of the sorbentmay becomemore accessiblefor PC and APC. The increasing of surface area, is increased the sorption amount and increase the removal efficiency of PC and APC 12 .…”

Section: Characterization Of Kt Sorbentmentioning

confidence: 99%