Selection of magnetic anion exchange resins for the removal of dissolved organic and inorganic matters

Wang, Qiongjie; Li, Aimin; Wang, Jinnan; Shuang, Chengdong

doi:10.1016/s1001-0742(11)61066-8

Cited by 18 publications

(10 citation statements)

References 36 publications

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“…In addition, NDMP can effectively reduce pollutant levels and the toxicities of drinking water, its fouling mechanism has also been elucidate . However, limited information on fluoride removal by NDMP is available . The main goal of this study is to systematically evaluate the removal characteristics of high concentration fluoride by NDMP, with a view to providing a theoretical basis for fluoride removal from ground water or sudden polluted surface water.…”

Section: Introductionsupporting

confidence: 83%

Performance evaluation of magnetic anion exchange resin removing fluoride

Wang

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND: Fluoride above a permissible level in drinking water has serious health effects on human beings. In this study, magnetic anion exchange resin, NDMP, was used to remove fluoride under different conditions and its defluoridation performance was compared with that of commercial D201 resin. RESULTS: NDMP had favourable adsorption capacity for fluoride at pH 5.0 to 9.0. Coexisting anions generated competition adsorption towards fluoride and the different competition influence ordering followed the sequence SO 4 2− > Cl − > NO 3 − > HCO 3 − . The existence of HA did not have a negative effect on fluoride adsorption under 40 mg L −1 of HA solution. The pseudo-first-order kinetic model fitted better for fluoride adsorption by both resins. The adsorption process was fitted better by the Langmuir model with a maximum fluoride adsorption capacity (13.5 mg g −1 ), indicating that the interaction between fluoride and NDMP resin was a homogeneous process. The negative values of G ∘ and H ∘ revealed that the adsorption was a spontaneous and exothermic reaction. Regenerated NDMP recovers adsorption performance without any loss. CONCLUSIONS: High adsorption and regeneration performance suggest that NDMP can be used as an effective and reusable defluoridation adsorbent.Figure 8. Regeneration performance of NDMP (fluoride concentration = 35 mg L −1 ; adsorbent dosage = 1.0 g L −1 ; agitation speed = 200 rpm; temperature = 298 K; pH without any adjustment).wileyonlinelibrary.com/jctb

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Section: Introductionsupporting

confidence: 83%

Performance evaluation of magnetic anion exchange resin removing fluoride

Wang

et al. 2015

J of Chemical Tech & Biotech

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“…This is carried out in order to investigate the behaviour of each MW range towards adsorption. Each fraction may be regarded as a component during adsorption enabling a multicomponent adsorption model to be applied [35][36][37]. For fractionation of humic substances and to prepare solutions with specific molecular mass of humic acid, ultrafiltration membranes (Vivaflow 50 obtained from Sartorius Ltd., UK) were used.…”

Section: The Adsorbent and The Adsorbatementioning

confidence: 99%

“…Aquatic humic substances were found to have 22.9% of the molecular weight distribution above 10,000 Da and 46.3% below 1000 Da. An aerated groundwater was also found to have a large proportion of its DOC (61%) falling within the range of molecular weight between 4000 and 10,000 Da, although this was justified since groundwater contains more soil-like humic substances than superficial waters [35][36][37]. Figure 4 shows the adsorption of fraction F1 for UV 254 and DOC.…”

Section: Equilibrium Adsorption Isotherms and Mechanisms Of Adsorptionmentioning

confidence: 99%

Use of nanoadvanced activated carbon, alumina and ferric adsorbents for humics removal from water: isotherm study

et al. 2020

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The adsorption of humic substances on three different adsorbents was investigated and adsorption isotherms were applied in this research. The three adsorbents studied include granular activated carbon (GAC), ferric oxihydroxide in its beta form (β-FeOOH) and iron-coated activated alumina (AAFS). Physical and chemical characteristics of the adsorbents were also fully investigated. Calcium was added to the HS solution in order to represent water with a hardness equivalent to water hardness typically found in London (UK). The examination of the GAC indicated a large microporous area with lower surface area associated with meso-and macropores. The AAFS and β-FeOOH did not present any microporous area. The overall surface area was high for GAC (980 m 2 g −1) but lower for AAFS (286 m 2 g −1) and β-FeOOH (360 m 2 g −1). The Freundlich isotherm model was fitted to all adsorbent-adsorbate systems. It was shown that GAC offered a large adsorption capacity for removal of low molecular weight humics F1 (MW 0-5 kDa) but not for substances with molecular weight larger than 10 kDa (F3). The β-FeOOH adsorption capacity was only 0.43 mg g −1 , compared with 9.11 and 2.55 mg g −1 on GAC and AAFS, respectively. On the contrary, F1 is not well adsorbed and only F2 (5-10 kDa) can be efficiently removed by AAFS and β-FeOOH. It was strongly suggested that precipitation/condensation occurred on the adsorbent surface.

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“…In the previous researches of our group (Li et al, , 2017aWang et al, 2012), the magnetic strongly basic anion-exchange resin (NDMP-2) and magnetic weak acidic cation-exchange resin (MCER) have been successfully applied in the advanced treatment of domestic sewage and electroplating effluent (Fig. S8) due to their excellent treatment performance and simple operation, as well as recovery of valuable compounds from wastewater.…”

Section: Desorption and Reusabilitymentioning

confidence: 99%

High-efficient removal of phthalate esters from aqueous solution with an easily regenerative magnetic resin: Hydrolytic degradation and simultaneous adsorption

Wang

Hua

et al. 2018

Journal of Cleaner Production

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Efficient removal of phthalate esters (PAEs) is of considerable concern since they pose serious ecological and human health risks. In this study, a magnetic strong base anion-exchange resin named MAER-OH was prepared and used as a solid basic catalyst and effective adsorbent. The MAER-OH was systematically characterized by scan electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermos-gravimetric analyses and vibrating sample magnetometer. Various factors influencing the removal of dimethyl phthalate (DMP) such as initial DMP concentration, resin dosage and temperature were investigated. The DMP can be completely converted to far less toxic phthalate at the final treatment stage, and more attractively, the potential hydrolysis intermediates were ion-exchanged by the resin simultaneously without obvious change of solution pH. The co-existing chloride was found to obviously enhance the DMP removal efficiency but result in an obvious increase of solution pH and formation of much more hydrolytic intermediates. The exhausted MAER-OH could be regenerated by 8.0% NaOH solution with negligible efficiency loss, and maintain its virgin removal efficiency for 20 successive cycles. Sequencing batch jar tests indicated that more than 5000 bed volumes of DMP solution (10 mg L −1 ) were efficiently treated by the MAER-OH and the saturated capacity of MAER-OH for DMP removal was 134.9 mg g −1 . Taken together, this highly effective and reusable MAER-OH can be easily modularized and separated, promising its huge potential for industrial-scale PAEs wastewater treatment. Fig. 8. The DMP removal performance by using MAER-OH in sequencing batch mode: (a) without co-existing anion and (b) in the presence of 50 mg L −1 NaCl in solution (1.0 mL resin, 318 K, 10 mg L −1 DMP).

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Selection of magnetic anion exchange resins for the removal of dissolved organic and inorganic matters

Cited by 18 publications

References 36 publications

Performance evaluation of magnetic anion exchange resin removing fluoride

Performance evaluation of magnetic anion exchange resin removing fluoride

Use of nanoadvanced activated carbon, alumina and ferric adsorbents for humics removal from water: isotherm study

High-efficient removal of phthalate esters from aqueous solution with an easily regenerative magnetic resin: Hydrolytic degradation and simultaneous adsorption

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