Iron-aluminum and aluminum-single impregnated biochar composite for nitrate adsorption in rare earth wastewater: behavior and mechanism

You, Hanyang; Lin, Hongyang; Li, Yang; Yang, Yang; Ma, Yanfei; Shang, Zhenxiao; Niu, Xiaoyin

doi:10.1007/s13399-021-02148-8

Cited by 4 publications

(7 citation statements)

References 47 publications

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“…It indicated that the pseudo second‐order model can better describe the experimental kinetics data for NO 3 − removal, which is consistent with the finding of other studies using other porous materials adsorbing NO 3 − in water 72,75,76 . Moreover, the results also show that the adsorption process of NO 3 − by modified HNTs includes chemical adsorption 70 …”

Section: Resultssupporting

confidence: 89%

“…Similar trends has been shown using kaolin‐modified CTAB for anion adsorption (hexavalent chromium and phosphate ions), 67,68 MMT‐CTAB, 69 biochar composites, 70 and powdered activated carbon 71 . In other hand, the adsorption capacity of nitrate is low in basic medium as well which can be related to the competition of the negative charges (OH − ) in the basic solution with the NO 3 ions at the adsorption sites, which do not promote the retention of nitrate anions 70 . Overall, the adsorption of nitrate by HNTs‐CTAB is dependent with pH of solution; hence, further experiments were carried out at pH 4.…”

Section: Resultssupporting

confidence: 77%

“…From Figure 10 a, it can be seen that the nitrate binding curve can be divided into two parts: the first part of the kinetics corresponding to a very short phase, where the binding of NO 3 − is very fast, it is carried out in the first minutes of adsorption and the second phase of medium speed where the adsorbed quantity changes more slowly than reaches equilibrium which is well represented by a saturation level. The equilibrium time is 3 h which is faster than other investigated adsorbent such as biochar composites and modified rice husk 70,72 . This phenomenon can be explained by the existence of the first step of adsorption of nitrate ions on easily accessible sites probably located on the external surfaces of HNTs‐CTAB, followed by molecular diffusion of adsorbate toward the sites of less accessible adsorption such as space inside HNTs before reaching adsorption equilibrium where all sites become saturated.…”

Section: Resultsmentioning

confidence: 91%

“…72,75,76 Moreover, the results also show that the adsorption process of NO 3 À by modified HNTs includes chemical adsorption. 70 As can be seen from Figure S1-2, the linear plots did not pass through the origin and intraparticle diffusion model shows multilinearity. First linear phase which is the adsorption on the outer surface is fast and completes in 5-60 min.…”

Section: Effect Of Contact Timementioning

confidence: 92%

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Preparation and application of a surfactant‐modified Halloysite nanotubes for the adsorption of nitrates from aqueous solutions: Kinetic and equilibrium studies

Fizir

Richa

Touil

et al. 2022

Env Prog and Sustain Energy

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The current research proposes the hexadecyltrimethylammonium bromide-modified Algerian halloysite nanotubes (HNTs-CTAB) as adsorbent for nitrate ions removal from aqueous solution via electrostatic interactions. X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Fouriertransform infrared spectroscopy (FT-IR), and nitrogen adsorption-desorption analysis techniques have been used to characterize the prepared adsorbants. The different operating condition that may affect the adsorption of nitrate was carried out. HNTs and HNTs-CTAB adsorption capacities are considerably pH dependent. The optimum conditions for maximum removal of nitrate from aqueous solution were as follows:adsorbent masse was 40 mg, initial pH was 4, temperature was 25 C, initial nitrate concentration of 100 mg/L and equilibrium time was 3 h. Under optimal value of process parameters, maximum NO 3 À adsorption capacity of 47.4 mg/g was obtained.Kinetic investigation confirmed that the nitrate adsorption on modified HNTs followed a pseudo-second-order with correlation coefficients greater than 0.98 (R 2 = 0.9870) and that empirical Freundlich isotherm was best fitted nitrate equilibrium adsorption. The thermodynamic studies indicated that the adsorption of nitrate onto HNTs-CTAB is endothermic and spontaneous. HNTs-CTAB displayed high regeneration ability by retaining a capacity above 40 mg/g after four reuse cycles.HNTs-CTAB containing plentiful nitrate could be returned to the soil directly as an economic slow release fertilizers or a soil amendment due to its environmentalfriendly performance. Therefore, HNTs-CTAB used for remediation of wastewater might be employed easily as farmland fertilizer.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 91%

Section: Effect Of Contact Timementioning

confidence: 92%

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Preparation and application of a surfactant‐modified Halloysite nanotubes for the adsorption of nitrates from aqueous solutions: Kinetic and equilibrium studies

Fizir

Richa

Touil

et al. 2022

Env Prog and Sustain Energy

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“…Generally, a higher adsorbent dosage leads to more removal of adsorbate from water [78,79]. However, a higher adsorbent dosage also caused less nitrate in the bulk solution, and this indicated a lower difference of nitrate concentration between the bulk solution and the adsorbent-water interface.…”

Section: Effect Of Operational Conditionsmentioning

confidence: 99%

Efficient Nitrate Adsorption from Groundwater by Biochar-Supported Al-Substituted Goethite

et al. 2022

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Groundwater nitrate contamination is challenging and requires efficient solutions for nitrate removal. This study aims to investigate nitrate removal using a novel adsorbent, biochar-supported aluminum-substituted goethite (BAG). The results showed that an increase in the initial Al/(Al + Fe) atomic ratio for BAGs from 0 to 20% decreased the specific surface area from 115.2 to 75.7 m2/g, but enhanced the surface charge density from 0.0180 to 0.0843 C/m2. By comparison, 10% of Al/(Al + Fe) led to the optimal adsorbent for nitrate removal. The adsorbent’s adsorption capacity was effective with a wide pH range (4–8), and decreased with increasing ionic strength. The descending order of nitrate adsorption inhibition by co-existing anions was SO42−, HCO3−, PO43−, and Cl−. The adsorption kinetics and isotherms agreed well with the pseudo-first-order equation and Langmuir model, respectively. The theoretical maximum adsorption capacity was 96.1469 mg/g. Thermodynamic analysis showed that the nitrate adsorption was spontaneous and endothermic. After 10-cycle regeneration, the BAG still kept 92.6% of its original adsorption capacity for synthetic nitrate-contaminated groundwater. Moreover, the main adsorption mechanism was attributed to electrostatic attraction due to the enhancement of surface charge density by Al substitution. Accordingly, the BAG adsorbent is a potential solution to remove nitrate from groundwater.

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Preparation and mechanism of modified quaternary amine straw for efficient nitrate removal from aqueous solution

Zhang

Guo

Zhao

et al. 2022

Biomass Conv. Bioref.

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Iron-aluminum and aluminum-single impregnated biochar composite for nitrate adsorption in rare earth wastewater: behavior and mechanism

Cited by 4 publications

References 47 publications

Preparation and application of a surfactant‐modified Halloysite nanotubes for the adsorption of nitrates from aqueous solutions: Kinetic and equilibrium studies

Preparation and application of a surfactant‐modified Halloysite nanotubes for the adsorption of nitrates from aqueous solutions: Kinetic and equilibrium studies

Efficient Nitrate Adsorption from Groundwater by Biochar-Supported Al-Substituted Goethite

Preparation and mechanism of modified quaternary amine straw for efficient nitrate removal from aqueous solution

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