Nitrate adsorption from aqueous solutions by calcined ternary Mg-Al-Fe hydrotalcite

Tong, Xiaowen; Yang, Zhiquan; Xu, Pan; Li, Ying; Niu, Xiaojun

doi:10.2166/wst.2017.082

Cited by 40 publications

(22 citation statements)

References 24 publications

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“…This might be because of high temperature is beneficial for the diffusion of nitrate ions to active adsorption sites of adsorbents, which will favor the adsorption of nitrate. Therefore, in higher temperature, the Re(%) was increased slightly, and the maximum nitrate removal percentage (Re= 97%) was belong to PCAC-Fe 0 at T= 55 °C, which is in accordance with the other studies (Song et al, 2016;Tong et al, 2017). In the experiments with PC-Fe 0 and PCAC-Fe 0 , the concentrations of ammonium, nitrite and nitrate, accumulated in the solution at every time interval, were determined at initial pH=6, T=25°C and C 0 =100 mg L -1 .…”

Section: Effect Of the Sorbent Dosage And Adsorption Temperaturesupporting

confidence: 91%

Batch Removal of Aqueous Nitrate Ions Using an Effective Nano-Biocomposite

2018

Global NEST: The International Journal

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The intent of this research is the investigation of the nitrate reduction from aqueous solution using biomass (pine cone (PC) and PC activated carbon (PCAC))supported zero valent iron nanoparticles (PC-Fe 0 and PCAC-Fe 0 ). The synthesis of these nano-bio-composites was based on the reduction of ferrous iron with borohydride, in which PC and PCAC acted as porous-based support materials. The structure of the adsorbents was characterized by SEM, XRD, FTIR and BET analysis. The SEM images revealed that nZVI immobilized on PC-Fe 0 and PCAC-Fe 0 were spherical and uniformly dispersed on the surface of the stabilizers. Batch experiments indicated that the nitrate removal efficiency decreased with the increase in the initial nitrate concentration and initial pH, but increased with the increase in the sorbent dosage and temperature. The maximum adsorption capacities of PC-Fe 0 and PCAC-Fe 0 for nitrate were 18.16 and 22.30 (mg/g), respectively. The nitrogen mass balance calculations revealed that zero valent iron nanoparticles in both PC-Fe 0 and PCAC-Fe 0 beads could generally reduce nitrate into ammonium, and nitrite usually was occurred as intermediate. Subsequently, PCAC-Fe 0 absorbs completely un-wanted ammonium, while PC-Fe 0 releases little ammonium in the solution.

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Section: Effect Of the Sorbent Dosage And Adsorption Temperaturesupporting

confidence: 91%

Batch Removal of Aqueous Nitrate Ions Using an Effective Nano-Biocomposite

2018

Global NEST: The International Journal

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“…From the pore size distribution curve, the main pore diameter of FeMgMn-LDH is distributed in the range of 7 nm to 23 nm, and average pore diameter is about 38.21 nm. The specific surface area of FeMgMn-LDH is 47.17 m 2 /g, which is lower than that of other similar materials such as Mg 4 Al-LDH (64.4 m 2 /g) 27 , Mg 3 Fe-LDH (70 m 2 /g) 28 and Mg 3 Al 0.1 Fe 0.9 -LDO (141.636 m 2 /g) 8 .…”

Section: Resultsmentioning

confidence: 72%

“…The band at around 1620 cm −1 is in accord with -OH bending vibration of water molecules. The intense band at 1387 cm −1 in the spectrum of Nitrate-FeMgMn-LDH is assigned to N=O stretching vibration 8,18,32 , indicating that nitrate ions have intercalated into the interlayer of FeMgMn-LDH. The bands at around 590 and 420 cm −1 are in accord with lattice vibrations: for example M-O, M-OH and M-O-M groups (where M = Mg, Fe, and Mn) in the sheets of FeMgMn-LDH 33 .…”

Section: Resultsmentioning

confidence: 99%

Selective nitrate removal from aqueous solutions by a hydrotalcite-like absorbent FeMgMn-LDH

Zhou

Tan

Gao

et al. 2020

Sci Rep

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FeMgMn-LDH, a type of potential environmental remediation material, has been synthesized via a co-precipitation method, and its adsorption characteristics for nitrate were investigated in this study. It’s shown that the prepared FeMgMn-LDH is a promising adsorbent for anions removal, which has high buffer capacity (final pH remained between 9 and 10) and high reversibility, and can remove nitrate ions selectively though an anion-sieve effect. The maximum amount of nitrate adsorption is 10.56 N-mg g−1 at 25 ℃. The removal rate of nitrate ions can reach 86.26% with the adsorbent dose of 5 g/L in a real water. The competition order of coexisting anions on nitrate adsorption by FeMgMn-LDH is CO32− > PO43− > SO42−. The negative values of ΔG0 (from − 27.796 to − 26.426 kJ mol−1) and ΔH0 (− 6.678 kJ mol−1) indicate that the nitrate adsorption process on the FeMgMn-LDH is spontaneous and exothermic. The main adsorption mechanisms of nitrate removal from aqueous solutions by FeMgMn-LDH are electrostatic attraction and ion exchange.

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“…In order to measure specific adsorption capacity, saturated adsorption capacity of Cu/Zn/Al-HTlc to iodide should be determined. Freundlich and Langmuir equations are common models to analyze the adsorption isotherm [22]. In this study, the two models were used to fit the experimental data.…”

Section: Adsorption Capacitymentioning

confidence: 99%

“…e hydrotalcite (HT) and hydrotalcite-like compounds (HTlcs) are double hydroxide-layered structure compounds [22]. Due to the layered structure, they have good adsorption property.…”

Section: Introductionmentioning

confidence: 99%

Coprecipitation Preparation of Cu/Zn/Al-Hydrotalcite-Like Compound for Copper Removal from Electroplating Wastewater

Bai

Wang

Huo

et al. 2019

Journal of Chemistry

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Cu/Zn/Al-hydrotalcite-like compound (Cu/Zn/Al-HTlc) was prepared by the coprecipitation method with ZnII, AlIII cations solution, and electroplating wastewater containing CuII cation. The preparation conditions of Cu/Zn/Al-HTlc were optimized. The metal ion pollutants removal effect and iodide maximum adsorption capacity of Cu/Zn/Al-HTlc were also studied. The physicochemical properties of the Cu/Zn/Al-HTlc were analyzed by X-ray diffraction, FTIR, SEM, N2 adsorption-desorption isotherms, and TG-DTG. The results showed that Cu/Zn/Al-HTlc should be prepared with the ZnII-AlIII molar ratio of 1.5 : 1, pH = 11, and aged at room temperature for 0.5 d. Structural analysis showed that the Cu/Zn/Al-HTlc was a layered compound. CuII and other metal ion pollutants can also be successfully removed from electroplating wastewater in the preparation process of Cu/Zn/Al-HTlc and reached Chinese National Emission Standard (GB 21900-2008). The optimal adsorption condition of calcinated Cu/Zn/Al-HTlc for iodide was as follows: the solid-liquid ratio was 1 : 250, the pH value was 8, and the adsorption process was carried out at 25°C for 30 min. The saturated adsorption capacity reached 1000 mg·g−1 at the optimal adsorption condition. The main reason for this high-saturated adsorption capacity of Cu/Zn/Al-HTlc was that iodide penetrated into the layered structure of Cu/Zn/Al-HTlc by physical adsorption and CuII undergoes a specific redox reaction, producing CuI. Hence, coprecipitation synthetic technology and prepared Cu/Zn/Al-HTlc could be potentially used for electroplating wastewater treatment.

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Nitrate adsorption from aqueous solutions by calcined ternary Mg-Al-Fe hydrotalcite

Cited by 40 publications

References 24 publications

Batch Removal of Aqueous Nitrate Ions Using an Effective Nano-Biocomposite

Batch Removal of Aqueous Nitrate Ions Using an Effective Nano-Biocomposite

Selective nitrate removal from aqueous solutions by a hydrotalcite-like absorbent FeMgMn-LDH

Coprecipitation Preparation of Cu/Zn/Al-Hydrotalcite-Like Compound for Copper Removal from Electroplating Wastewater

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