Chitosan /Zeolite Y/Nano ZrO 2 nanocomposite as an adsorbent for the removal of nitrate from the aqueous solution

Teimouri, Abbas; Nasab, Shima Ghanavati; Vahdatpoor, Niaz; Habibollahi, Saeed; Salavati, Hossein; Chermahini, Alireza Najafi

doi:10.1016/j.ijbiomac.2016.05.089

Cited by 123 publications

(38 citation statements)

References 48 publications

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“…It turned out that the adsorption equilibrium of nitrate on the NPs was accomplished in 180 min.Two simplified kinetic models, including pseudo‐first‐order and pseudo‐second‐order equations, were checked out. The rate constant of adsorption can be defined using the pseudo‐first‐orderequation given by Langergren :

log (q_{normale} - q_{normalt}) = log q_{normale} - [\frac{k_{1}}{2.303} t],

where k 1 is the pseudo‐first‐order rate constant (min −1 ), and q e and q t are the amounts of nitrate adsorbed (mg g −1 ) at equilibrium and at time t (min).…”

Section: Resultsmentioning

confidence: 99%

“…It turned out that the adsorption equilibrium of nitrate on the NPs was accomplished in 180 min.Two simplified kinetic models, including pseudo-first-order and pseudosecond-order equations, were checked out. The rate constant of adsorption can be defined using the pseudo-firstorderequation given by Langergren [36,37]: logðq e 2q t Þ5 logq e 2 k 1 2:303 t ;…”

Section: Adsorption Kinetic Modelmentioning

confidence: 99%

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Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Mahdavi

Molodi

Zarabi

2018

Env Prog and Sustain Energy

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The traditional drinking water purification process is inefficient in removing nitrate significantly. Adsorption can be the most practical method for the removal of nitrate from drinking water. In this study, novel MgO, CeO2, and ZnO nanoparticles (NPs) were utilized for nitrate removal. The MgO, CeO2, and Zn NPs were characterized by Fourier transform infrared spectrometry (FT‐IR), scanning electron microscopy‐energy disperse X‐ray (SEM‐EDX), and X‐ray diffractometer (XRD) analysis. The efficiency of nitrate removal was examined through batch adsorption experiments. The influence of various parameters was studied, namely pH (3–8), temperature (15–40°C), time (10–1440 min), and liquid/solid weight ratio (L/S =25 mL/0.025 g). The optimum conditions from mentioned parameters were used in isotherm experiments with initial nitrate concentration (22–220 mg/L). The adsorption kinetics and isotherm data obeyed well Pseudo‐second‐order and linear and Freundlich models, indicating the multi layer‐chemisorption of nitrate ions. The maximum adsorption capacities of nitrate (N‐ NO3−1) calculated by final point of isotherm experiments were 86.4 mg/g for MgO, 57.6 mg/g for ZnO, and 58.6 mg/g for CeO2. The thermodynamic parameters ( ΔG°, Δ H °, ΔS°) were evaluated. From the thermodynamic parameters, it is suggested that the adsorption of nitrate on NPs followed the endothermic and spontaneous processes. The desorption potential of MgO, CeO2, and ZnO also showed the stability and reusability. Our findings also revealed that among studied NPs from this study and literature MgO NPs is potentially the best adsorbent for removal of nitrate from aqueous solutions. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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log (q_{normale} - q_{normalt}) = log q_{normale} - [\frac{k_{1}}{2.303} t],

where k 1 is the pseudo‐first‐order rate constant (min −1 ), and q e and q t are the amounts of nitrate adsorbed (mg g −1 ) at equilibrium and at time t (min).…”

Section: Resultsmentioning

confidence: 99%

Section: Adsorption Kinetic Modelmentioning

confidence: 99%

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Mahdavi

Molodi

Zarabi

2018

Env Prog and Sustain Energy

View full text Add to dashboard Cite

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“…However, as the adsorbent dosage increased from 1 g/100 mL to 2 g/100 mL, the removal efficiency of nitrate decreased slightly and became stable. This may be due to the aggregation of adsorbent particles with the increase in adsorbent dosage, leading the surface adsorption sites to fail to be fully utilized [38]. …”

Section: Effect Of Adsorbent Dosagementioning

confidence: 99%

“…This finding indicated that the chemical adsorption process was a restriction factor for nitrate adsorption. The chemical adsorption involved the electron sharing or electron transfer between the adsorbent and the adsorbate [44], and the adsorption capacity was proportional to the number of active sites on the surface of the adsorbent particles [38]. Therefore, To obtain the rate parameters, fit graphs of the log (q e − q t ) vs. t and t/q t vs. t were applied to pseudo-first-order and pseudo-second-order kinetics models (Figure 7).…”

Section: Adsorption Kinetic Modelmentioning

confidence: 99%

“…In addition, metal ions such as calcium, iron and their metal oxides are hydrated on the surface of MSS to form hydroxides and hydrated metal oxides so that there are a large number of hydroxyl groups in a mutually associative or separate form present at the interface of the adsorbent, which has been confirmed in the infrared spectrum (Figure 10). Thus, the nitrate may be adsorbed by ion exchange (Equation (10), Figure 11I) [22,29,51,52] or through hydrogen bonding (Equation (11), Figure 11II) [38] with the hydroxyl group. According to the above model and related characterization analysis, chemical adsorption plays a major role in the removal of nitrate from modified steel slag.…”

Section: Removal Mechanismmentioning

confidence: 99%

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Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Yang

et al. 2017

Water

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Steel slag, which makes up a gigantic amount of metallurgical industrial solid waste, was in this experiment successfully synthesized an inexpensive adsorbent used to remove nitrate pollution from aqueous solution. This adsorbent was obtained by mixing steel slag, aluminium hydroxide and deionized water, and aging this at a mass ratio of 3:0.45:2, and then activating it at 800 • C. The physicochemical characteristics of the steel slag before and after modification were investigated to compare the effect of their surface properties on the adsorption behaviour of nitrate. The effects of adsorbent dosage, pH, and contact time on the adsorption process were investigated. The results showed that an increase in specific surface area and the formation of a positive surface of the modified steel slag (MSS) compared with the original steel slag (OSS) could effectively increase the number of the active adsorption sites and nitrate removal ability. The optimum parameters for nitrate removal were as follows: the concentration of nitrate was 20 mg/L, the dosage was 1 g/100 mL, the pH was four, and the reaction time was 180 min. The adsorption capacity of the MSS was approximately 1.9 times that of the OSS. The nitrate adsorption of the MSS was in accordance with the pseudo-second-order model and the Freundlich model, which indicated that the adsorption of nitrate on the MSS was mainly single layer chemical adsorption. The mechanism of nitrate removal mainly included ion exchange, hydrogen bonding, electrostatic interactions and intermolecular interactions. In addition, regeneration experiments indicated that the MSS after regeneration still had the capacity to remove nitrate.

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Application of Chitin/Chitosan and Its Derivatives as Adsorbents, Coagulants, and Flocculants

Pitchiah¹,

Aisverya²,

Gomathi³

et al. 2017

Chitosan

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Chitosan /Zeolite Y/Nano ZrO 2 nanocomposite as an adsorbent for the removal of nitrate from the aqueous solution

Cited by 123 publications

References 48 publications

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Application of Chitin/Chitosan and Its Derivatives as Adsorbents, Coagulants, and Flocculants

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Chitosan /Zeolite Y/Nano ZrO 2 nanocomposite as an adsorbent for the removal of nitrate from the aqueous solution

Cited by 123 publications

References 48 publications

Utilization of bare MgO, CeO2, and ZnO nanoparticles for nitrate removal from aqueous solution

Utilization of bare MgO, CeO2, and ZnO nanoparticles for nitrate removal from aqueous solution

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Application of Chitin/Chitosan and Its Derivatives as Adsorbents, Coagulants, and Flocculants

Contact Info

Product

Resources

About

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution

Utilization of bare MgO, CeO₂, and ZnO nanoparticles for nitrate removal from aqueous solution