Removal of organic polyelectrolytes and their metal complexes by adsorption onto xonotlite

Katsumata, Hideyuki; Kaneco, Satoshi; Matsuno, Rika; Itoh, Kumiko; Masuyama, Kazuaki; Suzuki, Tohru; Funasaka, Kunihiro; Ohta, Kouji

doi:10.1016/s0045-6535(03)00285-6

Cited by 19 publications

(8 citation statements)

References 27 publications

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“…11 Contrary to humic acids, fulvic acids do not coagulate even under low pH values, increasing the difficulty of their removal from aqueous medium. The lesser extent of fulvic acids sorption in comparison to humic acids has been reported for tobermorite, 5 xonotlite, 9 and vermiculite. 12 Development of new materials for this purpose requires evaluation of kinetic and thermodynamic sorption parameters, involving batch experiments in which known amounts of NOM are placed in contact with the sorbent by selected time intervals, followed by phase separation and quantification of the sorbate in the aqueous solutions.…”

Section: Introductionmentioning

confidence: 84%

“…[1][2][3] Besides to adsorption onto activated carbon, sorption onto clay minerals is among the main processes that have been studied aiming the removal of NOM from aqueous medium. [4][5][6][7][8][9][10] Humic and Fulvic acid (HA and FA) are the major components of NOM, but HA is more easily removed from waters. This fact has been explained by the intrinsic characteristics of humic substances such as the higher molar volume of humic acids.…”

Section: Introductionmentioning

confidence: 99%

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Sequential injection analysis as a tool for on-line monitoring the sorption of fulvic acid onto modified vermiculite

Abate¹,

Santos

Colombo

et al. 2006

J. Braz. Chem. Soc.

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Este trabalho apresenta um sistema de injeção seqüencial associado a uma unidade de filtração tangencial e um detector na região do ultravioleta, para monitorização em linha da sorção de ácido fúlvico em duas vermiculitas modificadas. Com o sistema proposto foi possível melhorar a resolução temporal, na investigação do tempo de equilíbrio necessário para o sistema sorventesoluto atingir o equilíbrio químico. A sorção em uma suspensão 10 g L -1 de vermiculita, modificada por intercalação com poliidroxicátions de Fe(III) foi rápida, atingindo o equilíbrio após 4 min de tempo de contato, resultando em sorção de 97,9 % do ácido fúlvico inicialmente presente em uma solução 10 mg L -1 . A sorção na suspensão 10 g L -1 de vermiculita organofílica, obtida por troca iônica com brometo de hexadeciltrimetilamônio apresentou uma rápida taxa inicial de sorção, seguida por processos de dessorção e readsorção, atingindo o equilíbrio após 30 min de tempo de contato, com sorção de 98% do ácido fúlvico inicialmente presente em uma solução 10 mg L -1 . This paper presents a sequential injection system associated with a tangential filtration unit and an ultraviolet detector for on-line monitoring of fulvic acid sorption onto two modified vermiculites. With the proposed approach it was possible to improve the temporal resolution in the investigation of the equilibrium time needed for the system sorbent-sorbate to reach the chemical equilibrium. Sorption onto a 10 g L -1 suspension of vermiculite material modified by intercalation of polyhydroxycations of Fe(III) was fast, reaching the equilibrium after 4 min of contact time, and resulting in sorption of 97.9 % of the initial 10 mg L -1 fulvic acid concentration. Sorption onto a 10 g L -1 suspension of an organic vermiculite which was modified by ion exchange with hexadecyltrimethylammonium bromide exhibited a fast initial rate of sorption, followed by desorption and re-adsorption processes, reaching the equilibrium after 30 min of contact time, with sorption of 98% of the initial 10 mg L -1 fulvic acid concentration.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Sequential injection analysis as a tool for on-line monitoring the sorption of fulvic acid onto modified vermiculite

Abate¹,

Santos

Colombo

et al. 2006

J. Braz. Chem. Soc.

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“…It was reported that the adsorption of humic substances increases with decreasing pH [11,33]. Only in a few cases [8,17], at very low pH, the adsorption capacity decreases again as a result of repulsion forces between the positively charged surface and positively charged HA molecule. In our work, the surface charge of carbon SA/N/CaFe is positive in the whole pH range studied (below 12.2) whereas for SA/N/CaFe dem carbon the charge of surface changes.…”

Section: Effect Of Phmentioning

confidence: 98%

“…Study on the adsorption of HAs and other dissolved organic material has shown that not only the molecular size and chemical characteristic of macromolecules but also the pH and ionic strength of solution and the porous texture of adsorbent have an influence on the extent of their removal [12,[14][15][16]. Most studies on the adsorption of HAs have been focused on the removal of humic acids extracted from soil [4,15,17] and river sediments [15,18,33], and commercial Aldrich humic acid [9][10][11]. To our knowledge there is no report dealing with the adsorption by activated carbon of humic acids that were isolated from lignite.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of lignite-derived humic acids on coal-based mesoporous activated carbons

Lorenc-Grabowska

Gryglewicz

2005

Journal of Colloid and Interface Science

148

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“…Experimental results indicated that the removal of the reactive dye on HT is a complex process that involves film diffusion, pore diffusion and reaction. Katsumata et al (2003) conducted a study to evaluate adsorption of organic polyelectrolytes (humic and fulvic acids) and their metal complexes by xonotlite. It was found that 80% of humic and 30% of fulvic acid was removed from water by xonotlite.…”

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confidence: 99%

Physico‐Chemical Processes

Ahmad¹,

Begum²,

Hoek³

et al. 2004

Water Environment Research

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In this chapter, the physicochemical processes used in the treatment of aqueous streams such as domestic and industrial wastewaters, drinking water, contaminated groundwater, and aqueous residuals from soil treatment are reviewed. Processes that have their own chapter in the WEF review are not included in this chapter. MEMBRANE PROCESSES GENERALMembrane technology is widely accepted as a means of producing various qualities of water from surface water, well water, brackish water, and seawater.Membrane technology is also used in industrial processes and in industrial wastewater treatment, and lately membrane technology has moved into the area of treating secondary and tertiary municipal wastewater and oil field produced water (Nicolaisen, 2003). In many cases one membrane process is followed by another with the purpose of producing water of increasing purity and quality for various purposes. One type of membrane may thus enhance the function of another to meet goals ranging from disposal of wastewater to production of drinking water from alternative sources. 824 Membrane technologies offer the possibility of managing the total water resources in a region, which is of special interest in geographical areas where natural water resources are scarce. A recent project entitled Novel Technologies for Drainage Water Treatment financed by Egyptian Academy of Scientific Research and Technology (ASRT) and executed by National Research Center (NRC) comprised a detailed assessment of the desalting technologies for reclamation of agricultural drainage water (ADW) (Abulnour et al., 2003). This paper addresses the comparative techno-economics of the following systems (a) activated carbon (AC)-ultrafiltration (UF)-reverse osmosis (RO), (b) UF-electrodialysis reversal (EDR)-RO, (c) AC-ED-ion exchange (IE), (d) microfiltration (MF)-UF-RO1-RO2 and (e) slow sand filtration (SSF)-AC-IE. The results reveal that treatment scheme (d) MF-UF-RO1-RO2 provides the lowest cost production of high quality water. The most important recommendations point to the importance of field demonstration in selected locations to explore system reliability and performance under actual applications.The increasing need for water in arid regions of the world has resulted in the emergence of new water re-use technologies. The success of water re-use projects however, does not just depend on the effectiveness and suitability of the technology, but also on the presence of an institutional framework that ensures that the treated water can be distributed and used safely and efficiently. These two diverse issues were examined by MWH in projects carried out in Egypt and in the USA (Lawrence et al., 2003). One project in the East Bank of Cairo assessed the potential benefits of treated wastewater for irrigation in agricultural schemes. The project demonstrated enhanced 825 crop yields but that additional treatment of the wastewater was required to improve its microbiological quality to the standards required by both international and Egyptian legislation for safe re...

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Removal of organic polyelectrolytes and their metal complexes by adsorption onto xonotlite

Cited by 19 publications

References 27 publications

Sequential injection analysis as a tool for on-line monitoring the sorption of fulvic acid onto modified vermiculite

Sequential injection analysis as a tool for on-line monitoring the sorption of fulvic acid onto modified vermiculite

Adsorption of lignite-derived humic acids on coal-based mesoporous activated carbons

Physico‐Chemical Processes

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