Adsorption of Cu–EDTA complexes from aqueous solutions by polymeric Fe/Zr pillared montmorillonite: Behaviors and mechanisms

Wu, Pingxiao; Zhou, Jianbing; Wang, Xiaorong; Dai, Yaping; Dang, Zhi; Zhu, Nengwu; Li, Ping; Wu, Jinhua

doi:10.1016/j.desal.2011.04.043

Cited by 58 publications

(15 citation statements)

References 41 publications

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“…Recently, our group has developed a series of low-cost adsorbents or catalysts based on modified montmorillonite [ 16 , 17 , 19 – 25 ]. To develop an efficient adsorbent with plenty of ligand-binding sites (-NH 2 ) for the treatment of Co 2+ -rich wastewater, a series of APTES-functionalized montmorillonites with different cation exchange capacities were prepared and their physicochemical properties were analyzed by XRD, FTIR, SEM and N 2 adsorption-desorption.…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Co2+ from Aqueous Solution by 3-Aminopropyltriethoxysilane Functionalized Montmorillonite with Enhanced Adsorption Capacity

Huang

Gong

et al. 2016

PLoS ONE

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To achieve a satisfactory removal efficiency of heavy metal ions from wastewater, silane-functionalized montmorillonite with abundant ligand-binding sites (-NH2) was synthesized as an efficient adsorbent. Ca-montmorillonite (Ca-Mt) was functionalized with 3-aminopropyl triethoxysilane (APTES) to obtain the APTES-Mt products (APTES1.0CEC-Mt, APTES2.0CEC-Mt, APTES3.0CEC-Mt, APTES4.0CEC-Mt) with enhanced adsorption capacity for Co2+. The physico-chemical properties of the synthesized adsorbents were characterized by spectroscopic and microscopic methods, and the results demonstrated that APTES was successfully intercalated into the gallery of Ca-Mt or grafted onto the surface of Ca-Mt through Si-O bonds. The effect of solution pH, ionic strength, temperature, initial concentrations and contact time on adsorption of Co2+ by APTES-Mt was evaluated. The results indicated that adsorption of Co2+ onto Ca-Mt, APTES1.0CEC-Mt and APTES2.0CEC-Mt can be considered to be a pseudo-second-order process. In contrast, adsorption of Co2+ onto APTES3.0CEC-Mt and APTES4.0CEC-Mt fitted well with the pseudo-first-order kinetics. The adsorption isotherms were described by the Langmuir model, and the maximum adsorption capacities of APTES1.0CEC-Mt, APTES2.0CEC-Mt, APTES3.0CEC-Mt and APTES4.0CEC-Mt were 25.1, 33.8, 61.6, and 61.9 mg·g-1, respectively. In addition, reaction temperature had no impact on the adsorption capacity, while both the pH and ionic strength significantly affected the adsorption process. A synergistic effect of ion exchange and coordination interactions on adsorption was observed, thereby leading to a significant enhancement of Co2+ adsorption by the composites. Thus, APTES-Mt could be a cost-effective and environmental-friendly adsorbent, with potential for treating Co2+-rich wastewater.

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Section: Introductionmentioning

confidence: 99%

Efficient Removal of Co2+ from Aqueous Solution by 3-Aminopropyltriethoxysilane Functionalized Montmorillonite with Enhanced Adsorption Capacity

Huang

Gong

et al. 2016

PLoS ONE

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“…As depicted in the previous report [10], Cu(II)-EDTA anions were quite stable during this pH range, so the concentration of EDTA was not measured in this study.…”

Section: Sorption Experimentsmentioning

confidence: 99%

“…In addition, Maketon et al have described the removal efficiency of copper and Cu(II)-EDTA complexes on polyethyleneimine and explored the adsorption mechanisms with variable copper/EDTA ratios [9]. Besides, Wu et al have reported that polymeric Fe/Zr pillared montmorillonite could be utilized as an effective sorbent for the removal of Cu(II)-EDTA chelates from wastewater [10]. Moreover, other adsorbents like active carbon, chitosan and goethite have also been shown to perform well for Cu(II)-EDTA chelates adsorption [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cu(II)–EDTA chelates on tri-ammonium-functionalized mesoporous silica from aqueous solution

Wang

Lan

et al. 2013

Separation and Purification Technology

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a b s t r a c tThe preparation and application of tri-ammonium-functionalized mesoporous silica SBA-15 (NNN-SBA-15) for sequestering Cu(II)-EDTA chelates from aqueous solution with low concentration of 0.1 mmol/L were explored. The adsorption properties of copper in the presence of equimolar EDTA were examined as a function of initial pH, ionic strength, initial concentration and temperature. Results revealed that the adsorption of Cu(II)-EDTA chelates on NNN-SBA-15 achieved equilibrium within 2 min and fitted well with the Langmuir model. The maximum copper adsorption capacity was estimated to be 26.3 mg/g. High ionic strength (0.1 mol/L of NaNO 3 ) influenced the removal of Cu(II)-EDTA chelates, while temperature (from 15 to 35°C) had slight effect on the adsorption capacity. Compared with the copper sorption system without EDTA species, the capture ability of copper increased significantly with coexistence of EDTA species in acidic condition. XPS spectrum studies indicated that Cu(II)-EDTA was removed from aqueous solution by the electrostatic interaction and hydrogen bond interaction between the protonated amine groups of NNN-SBA-15 and Cu(II)-EDTA chelates.

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“…In recent years, approaches concerning the treatment of metal-EDTA chelates in wastewater have been extensively studied, including TiO 2 -based photocatalytic oxidation [6,7], membrane filtration [8], adsorption [2,9], Fenton oxidation and precipitation [10], replacement-precipitation [11,12], ion exchange [13] and so on.…”

Section: Introductionmentioning

confidence: 99%

Decomplexation and subsequent reductive removal of EDTA-chelated CuII by zero-valent iron coupled with a weak magnetic field: Performances and mechanisms

Guan

Xiao

Qiao

et al. 2015

Journal of Hazardous Materials

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Adsorption of Cu–EDTA complexes from aqueous solutions by polymeric Fe/Zr pillared montmorillonite: Behaviors and mechanisms

Cited by 58 publications

References 41 publications

Efficient Removal of Co2+ from Aqueous Solution by 3-Aminopropyltriethoxysilane Functionalized Montmorillonite with Enhanced Adsorption Capacity

Efficient Removal of Co2+ from Aqueous Solution by 3-Aminopropyltriethoxysilane Functionalized Montmorillonite with Enhanced Adsorption Capacity

Adsorption of Cu(II)–EDTA chelates on tri-ammonium-functionalized mesoporous silica from aqueous solution

Decomplexation and subsequent reductive removal of EDTA-chelated CuII by zero-valent iron coupled with a weak magnetic field: Performances and mechanisms

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