Nitrate removal using natural clays modified by acid thermoactivation

Mena-Durán, Cinthia J.; Kou, María del Rosario Sun; López, Tomás Undabeytia; Azamar-Barrios, J.A.; Aguilar, D.H.; Domínguez, M.I.; Odriozola, J.A.; Quintana, P.

doi:10.1016/j.apsusc.2006.12.103

Cited by 80 publications

(32 citation statements)

References 4 publications

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“…This feature is attributable to the presence of high textural (interparticle) porosity [52], and such particle domains represented substantial adsorption of nitrogen for low surface area mesoporous materials [51]. The origin of N2 sorption isotherms of imprinted polymers of MAA-β-CD (Figure 7a-d) exhibited similar trends of Type-IV isotherms and Type H3 hysteresis loops, confirming the mesoporosity of the polymers with the presence of heterogeneous open pores [53]. The Type H3 hysteresis loop observed that polymers with aggregates of plate-like particles resulting in slit-shaped pores [54].…”

Section: Characterization Of Raft-mips and Mipssupporting

confidence: 59%

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

2015

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Two types of reversible addition-fragmentation chain transfer molecularly imprinted polymers (RAFT-MIPs) were synthesized using different monomers, which were methacrylic acid functionalized β-cyclodextrin (MAA-β-CD) and 2-hydroxyethyl methacrylate functionalized β-cyclodextrin (HEMA-β-CD), via reversible addition-fragmentation chain transfer (RAFT) polymerization, and were represented as RAFT-MIP(MAA-β-CD) and RAFT-MIP(HEMA-β-CD), respectively. Both RAFT-MIPs were systematically characterized using Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), Brunauer-Emmett-Teller (BET), and rebinding experimental study. The results were compared with MIPs synthesized via the traditional radical polymerization (TRP) process, and were represented as MIP(MAA-β-CD) and MIP(HEMA-β-CD). Morphology results show that RAFT-MIP(MAA-β-CD) has a slightly spherical feature with a sponge-like form, while RAFT-MIP(HEMA-β-CD) has a compact surface. BET results show that the surface area of RAFT-MIP(MAA-β-CD) is higher than MIP(MAA-β-CD), while the RAFT-MIP(HEMA-β-CD) surface area is lower than that of MIP(HEMA-β-CD). Rebinding experiments indicate that the RAFT agent increased the binding capacity of RAFT-MIP(MAA-β-CD), but not of RAFT-MIP(HEMA-β-CD), which proves that a RAFT OPEN ACCESSPolymers 2015, 7 485 agent does not always improve the recognition affinity and selective adsorption of MIPs. The usability of a RAFT agent depends on the monomer used to generate potential MIPs.

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Section: Characterization Of Raft-mips and Mipssupporting

confidence: 59%

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

2015

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“…Examinando os resultados da área específica da argila ativada termicamente a 500 ºC, nota-se que ocorre uma pequena diminuição de 3 % em relação a argila "in natura" [25][26].…”

Section: Caracterizaçãounclassified

Remoção de cádmio a partir da argila de Toritama (estado de Pernambuco) ativada termicamente em sistema de banho finito

2009

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ResumoEste trabalho tem como objetivo caracterizar a argila de Toritama, estado de Pernambuco, na sua forma "in natura" após ativação térmica a 500 °C visando sua utilização na remoção de Cd 2+ . A argila "in natura" foi caracterizada por meio de espectrometria de raios X por energia dispersiva (EDX), difração de raios X e análise textural usando adsorção física de nitrogênio (BET). As argilas ativadas termicamente (100, 200, 300, 400 e 500 °C) foram caracterizadas por difração de raios X. A argila ativada termicamente a 500 °C foi caracterizada por EDX e BET. A remoção do Cd 2+ pela argila ativada termicamente foi realizada em sistema de banho finito. O tratamento térmico modificou levemente a área, como mostrou a análise de área de superfície específica, mas não modificou a distribuição de diâmetro de poros. Os dados experimentais para o sistema de banho finito se ajustaram aos modelos estudados, Langmuir e Freundlich; no entanto, o modelo de Freundlich foi mais satisfatório. O processo de remoção de cádmio em sistema de banho finito pela argila de Toritama ativada termicamente a 500 °C só atinge o equilíbrio depois de 120 min e apresenta um percentual de cerca de 86,8% de remoção de cádmio.Palavras-chave: tratamento térmico, caracterização, argilas, metais pesados, adsorção. (100, 200, 300, 400 Abstract The purpose of this study is to characterize the clay of Toritama (Pernambuco, Brazil), in its form "in nature", and also after thermal activation at 500 °C, aiming its use in the removal of Cd 2+ . The clay "in nature" was characterized byg X-ray spectrometry by dispersive energy (EDX), X-ray diffraction (XRD), and surface area measurement by physical adsorption of nitrogen (BET). The thermally activated clay

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“…In many countries, eutrophication is the main water pollution problem of lakes, water reservoirs, oceans, and the like [1]. In order to solve the eutrophication problems induced by the traditional secondary biological effluent and realize reuse of wastewater, which reduces sewage discharge and improves water shortage conditions, studies of sewage treatments in many countries have been done, especially those involving the removal of nitrogen and phosphorus [2,3].…”

Section: Introductionmentioning

confidence: 99%

Ammonia-nitrogen and phosphates sorption from simulated reclaimed waters by modified clinoptilolite

Huo

Lin

Dong

et al. 2012

Journal of Hazardous Materials

134

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Nitrate removal using natural clays modified by acid thermoactivation

Cited by 80 publications

References 4 publications

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

Effects of RAFT Agent on the Selective Approach of Molecularly Imprinted Polymers

Remoção de cádmio a partir da argila de Toritama (estado de Pernambuco) ativada termicamente em sistema de banho finito

Ammonia-nitrogen and phosphates sorption from simulated reclaimed waters by modified clinoptilolite

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