Novel insights in Al-MCM-41 precursor as adsorbent for regulated haloacetic acids and nitrate from water

Bruzzoniti, Maria Concetta; Carlo, Rosa Maria De; Sarzanini, Corrado; Caldarola, Dario; Onida, Barbara

doi:10.1007/s11356-012-0900-6

Cited by 13 publications

(10 citation statements)

References 31 publications

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“…The role of BPBMO as a bifunctional material for the simultaneous removal of Pb 2+ and NO 3 – ions can be compared with reported silica based materials. ,,− Particularly, Yu and group have synthesized the acid–base bifunctional (dual electrostatic characteristics) mesoporous silica (Al-MS2) for the simultaneous removal of Pb 2+ and NO 3 – and the removal capacity was found to be higher than the BPBMO (Table S1). However, the mechanism was not confirmed by the instrumentation techniques.…”

Section: Resultsmentioning

confidence: 99%

l-Proline Functionalized Dicationic Framework of Bifunctional Mesoporous Organosilica for the Simultaneous Removal of Lead and Nitrate Ions

Dinker

Ajithkumar

Kulkarni

2017

ACS Sustainable Chem. Eng.

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A novel bifunctional mesoporous organosilica, PEG-functionalized bis-prolinium chloride bridged mesoporous organosilica (BPBMO) was synthesized by reacting the precursor, PEG-functionalized bis-prolinium chloride bridged organosilane (BPRIL) with tetraethyl orthosilicate (TEOS) in the presence of surfactant. The chemical conformation of BPBMO was investigated by using Fourier transform infrared (FTIR), thermogravimentric analysis (TGA), 13C, and 29Si cross-polarization/magic angle spinning (CP/MAS) NMR techniques. The characterization represents PEG-linked-prolinium (−N+Cl–) and carboxyl (−COOH) entities, constructing the dicationic framework through siloxane (Si–O–Si) linkages. The pore-wall distribution and the periodicity of BPBMO retained during the synthesis were examined by small-angle X-ray scattering (SAXS), Brunauer-Emmett-Teller-Barrett-Joyner-Halenda (BET-BJH), and transmission electron microscopy (TEM) techniques. The results revealed BPBMO as a spherical shaped solid (50–100 nm) having mesopore channels hexagonally arranged with interparticle porosity (S BET = 487 m2/g and D BJH = 5.1 nm). The material has provided active binding sites for the simultaneous removal of NO3 – and Pb2+ ions when introduced in the aqueous solutions of Pb(NO3)2 (50 mg/L, pH 6). The removal of NO3 – by ion-exchange with prolinium (−N+Cl–) entities and the electrostatic interaction of Pb2+ with carboxylate (−COO–) group were characterized by using Raman spectroscopy, ion chromatography, and X-ray photoelectron spectroscopy (XPS) technique. The maximum removal of NO3 – and Pb2+ ions were achieved within 1 h of the adsorption reaction. The adsorption has followed the Langmuir isotherm model with the adsorption capacities (q m) of 23.04 and 21.92 mg/g for NO3 – and Pb2+ ions, respectively. The efficiency of the adsorbent was also compared with other adsorbents. Further, the BPBMO material has depicted three consecutive adsorption/desorption cycles with negligible loss in the structural conformation.

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Section: Resultsmentioning

confidence: 99%

l-Proline Functionalized Dicationic Framework of Bifunctional Mesoporous Organosilica for the Simultaneous Removal of Lead and Nitrate Ions

Dinker

Ajithkumar

Kulkarni

2017

ACS Sustainable Chem. Eng.

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“…Materials intended for the removal of pollutants from waters are usually described with reference to their retention performance through kinetics and adsorption isotherms [ 101 ].…”

Section: Activated Carbon and Biochar: The Different Approach To Characterizationmentioning

confidence: 99%

Characterization Techniques as Supporting Tools for the Interpretation of Biochar Adsorption Efficiency in Water Treatment: A Critical Review

et al. 2021

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Over the past decade, biochar (BC) has received significant attention in many environmental applications, including water purification, since it is available as a low-cost by-product of the energetic valorisation of biomass. Biochar has many intrinsic characteristics, including its porous structure, which is similar to that of activated carbon (AC), which is the most widely used sorbent in water treatment. The physicochemical and performance characteristics of BCs are usually non-homogenously investigated, with several studies only evaluating limited parameters, depending on the individual perspective of the author. Within this review, we have taken an innovative approach to critically survey the methodologies that are generally used to characterize BCs and ACs to propose a comprehensive and ready-to-use database of protocols. Discussion about the parameters of chars that are usually correlated with adsorption performance in water purification is proposed, and we will also consider the physicochemical properties of pollutants (i.e., Kow). Uniquely, an adsorption efficiency index BC/AC is presented and discussed, which is accompanied by an economic perspective. According to our survey, non-homogeneous characterization approaches limit the understanding of the correlations between the pollutants to be removed and the physicochemical features of BCs. Moreover, the investigations of BC as an adsorption medium necessitate dedicated parallel studies to compare BC characteristics and performances with those of ACs.

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“…In order to investigate the removal mechanisms and the potential rate-controlling steps, the authors used first-order, pseudo-first-order (Ho 2004 ), pseudo-second-order (Ho and McKay 1999 ), and Elovich (Cheung et al 2000 ;Low 1960 ) kinetic models to the experimental data obtained within 0-24 h. Details of the used models can be found elsewhere (Bruzzoniti et al 2012 ).…”

Section: Removal Kineticsmentioning

confidence: 99%

Removal of Inorganic Contaminants from Aqueous Solutions: Evaluation of the Remediation Efficiency and of the Environmental Impact of a Zero-Valent Iron Substrate

Bruzzoniti

Fiore

2014

Water Air Soil Pollut

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This work presents an evaluation of the remediation efficiency and of the environmental impact of a zero-valent iron commercial substrate used for the removal of heavy metals from groundwater in different conditions. A specific feature of the substrate is the presence of zero-valent iron (ZVI), organic carbon, and sulfate. The authors analyzed its composition and performances by means of batch tests in different boundary conditions. In detail, the efficacy was evaluated for metals (Cu, Cr, Pb, and Zn) and for nitrates and sulfates. Neutral and acidic pH values, imputable to dangerous waste landfill leachate or to acid mine drainage, were considered. The environmental impact of the substrate was also assessed for the investigated pHs. The product showed a high efficiency in the removal of metals (mainly described by a pseudo-second-order kinetic model), with a noticeable variability according to the pH of the polluted phase. Nitrate ion removal was inhibited by sulfates at all the considered pH values. Characterization and batch studies revealed that the substrate was a source of Mn, Cr, Pb, 1 2,* 1 2 e.Proofing http://eproofing.springer.com/journals/printpage.php?token=0HL98Nc... 1 di 28 04/08/2014 18.57 Cu, and sulfate ions, besides Fe. This study shows that the employment of an optimized amount of reagent, while achieving good performances, is essential to contain the leaching of undesirable substances into aqueous environment.

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Novel insights in Al-MCM-41 precursor as adsorbent for regulated haloacetic acids and nitrate from water

Cited by 13 publications

References 31 publications

l-Proline Functionalized Dicationic Framework of Bifunctional Mesoporous Organosilica for the Simultaneous Removal of Lead and Nitrate Ions

l-Proline Functionalized Dicationic Framework of Bifunctional Mesoporous Organosilica for the Simultaneous Removal of Lead and Nitrate Ions

Characterization Techniques as Supporting Tools for the Interpretation of Biochar Adsorption Efficiency in Water Treatment: A Critical Review

Removal of Inorganic Contaminants from Aqueous Solutions: Evaluation of the Remediation Efficiency and of the Environmental Impact of a Zero-Valent Iron Substrate

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