Relative distribution of Cd2+ adsorption mechanisms on biochars derived from rice straw and sewage sludge

Gao, Liyang; Deng, Jin-Huan; Huang, Guofu; Li, Kai; Cai, Kunzheng; Liu, Yan; Huang, Fei

doi:10.1016/j.biortech.2018.09.138

Cited by 270 publications

(76 citation statements)

References 41 publications

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“…Note that CMB showed higher adsorption capacities of Cd 2+ than M-CMB, which may be due to the greater amount of negative charge, or larger of specific surface area of CMB compared to M-CMB under the pH range studied (Figure 2A,B). A similar phenomenon that the biochars have lower pH IEP but higher adsorption capacity, was also reported in many previous works reporting that electrostatic interaction was likely the driving force for the Cd 2+ adsorption onto biochar surfaces [1,32,33].…”

Section: Ph Adsorption Edgesupporting

confidence: 84%

“…The unfamiliar reduction state of P was detected as CdP 2 after adsorption, which might be resulted from the release of CH 4 , H 2 and CO during pyrolysis [48]. Among these precipitates, such as CdCO 3 , Cd 3 (PO 4 ) 2 , CdSiO 3 , Cd(OH) 2 and CdS, were probably due to high concentrations of CO 3 2− , PO 4 3− , S and Si content in the original biochars ( Figure 1 and Table 1), which were also observed in the previous studies on the heavy metal adsorption by the biochars [1,49,50]. In particular, the precipitates of CdFe 2 O 4 were detected on the surface of M-CMB after adsorption, which could be attributed to the presence of Fe 3 O 4 particles, generating adsorption sites for metal ions [6,10].…”

Section: Metal Precipitationsupporting

confidence: 77%

“…The adsorption capacity resulting from precipitation (Q pre ), ion-exchange (Q exc ), complexation (Q com ), Cπ-coordination (Q cπ ) and total adsorption (Q ct ), were calculated by the modified methods of Gao et al [1] and Wang et al [23], respectively. The corresponding contribution percentage of each mechanism to total adsorption was determined by the Q pre /Q ct , Q exc /Q ct , Q com /Q ct and Q cπ /Q ct ratio.…”

Section: The Contribution Of Different Adsorption Mechanismsmentioning

confidence: 99%

“…Cadmium (Cd) is one of the most toxic heavy metal pollutants in wastewater, since it accumulates in living organisms and passes through the food chain into human organs, causing serious toxicity even at low concentration of 0.001-0.1 mg/L [1]. Significant quantities of Cd are introduced into the environment by anthropogenic activities, including manufacturing of nickel-cadmium batteries, synthetic pigment production, metal coatings, stabilizers in plastic products, and incineration of solid wastes, in which the worldwide production of Cd in 2005 was estimated to be 20,000 metric tons [2].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

Huang

Zhang

et al. 2020

IJERPH

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The present study investigated the adsorption of Cd2+ by nonmagnetic and magnetic biochars (CMB and M-CMB) derived from chicken manure, respectively. The adsorption characteristics were investigated as a function of initial pH, contact time, initial Cd2+ concentration and magnetic separation. Adsorption process of both biochars were better described by Pseudo-second-order kinetic equation and Freundlich isotherm model, which were spontaneous and endothermic in nature. It was found that maximum capacities were 60.69 and 41.07 mg/g obtained at the initial Cd2+ concentration of 180 mg/L for CMB and M-CMB, and the turbidity of adsorption-treated solution was reduced from 244.3 to 11.3 NTU after magnetic separation of 0.5 min. These indicated that M-CMB had lower adsorption capacity of Cd2+ than CMB, though it was successfully separated from the treated solutions. Furthermore, both biochars before and after adsorption were analyzed by SEM-EDS, XRD and FTIR. Adsorption mechanisms mainly included precipitation, ion-exchange, complexation and Cπ-coordination, in which precipitation and ion-exchange dominated the adsorption process by CMB, while in M-CMB, precipitation was always predominant mechanism, followed by ion-exchange. The two other mechanisms of complexation and Cπ-coordination were trivial in both biochars, jointly contributing 7.21% for CMB and 5.05% for M-CMB to total adsorption. The findings deepen our understanding of the mechanisms governing the adsorption process, which are also important for future practical applications in the removal of heavy metals from wastewater by the biochars.

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Section: Ph Adsorption Edgesupporting

confidence: 84%

Section: Metal Precipitationsupporting

confidence: 77%

Section: The Contribution Of Different Adsorption Mechanismsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

Huang

Zhang

et al. 2020

IJERPH

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“…By analogy with the gas adsorption onto the solid surface (equilibrium), we can assume that the K constant in Eq. (10) can be written as[41] where [AB] ̊ is the standard concentration, q ABS is the molecular partition function of ABS and µ̊ is the molecular standard chemical potential of AB in the solution phase.…”

mentioning

confidence: 99%

Preparation and characterization of Chicory leaf powder and its application as a nano-native plant sorbent for removal of Acid Blue 25 from aqueous media: isotherm, kinetic and thermodynamic study of the adsorption phenomenon

et al. 2020

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In this study, the Chicory leaf powder (CLP) was used as a native adsorbent to eliminate the Acid Blue 25 dye from aqueous media. The prepared native adsorbent was characterized by several techniques including the X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform spectroscopy (FTIR), Brunauer-Emmet-Teller essay (BET), and particle size analyzer (PSA). A collection of experiments was performed to distinguish the optimal conditions and to probe the effects of the different parameters such as initial concentration, contact time, adsorbent dosage, pH of solution, and temperature on the sorbent capacity. The attained optimal conditions for removal the Acid Blue 25 dye were pH = 3-4, contact time 50 min, dosage 0.1 g, and initial concentrations 10 (mg/L) at 30 °C. The adsorption data revealed that the adsorption procedure has more match with the Langmuir isotherm than others. The kinetic data were better fitted with the pseudo-second-order pattern with a trusty correlation coefficient. Finally, the thermodynamic parameters illustrated that the adsorption process is exothermal and spontaneous. Based on magnitude of the standard enthalpy change related to the studied adsorption, we may derive that the considered adsorption is physical adsorption.

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Experimental study and modelling of effective parameters on removal of Cd(II) from water by halloysite/graphene quantum dots magnetic nanocomposite as an adsorbent using response surface methodology

Pirhaji

Moeinpour

Dehabadi

et al. 2020

Applied Organom Chemis

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Graphene quantum dots (GQDs) were covalently immobilized onto the NiFe2O4‐halloysite nanotubes (NiFe2O4‐HNTs) surface to fabricate a nanocomposite material utilized as an active adsorbent to eliminate Cd(II) ions from water. NiFe2O4 nanoparticles were synthesized and simultaneously deposited on HNTs. Then, the material surface was coated by APTES (aminopropyltriethoxysilane) to cause GQDs be connected to the external layer via an amide bond. The prepared nanomaterial structure was identified by TEM, XRD, FT‐IR, BET isotherm, EDS analysis and VSM (vibrating sample magnetometry). Box–Behnken design incorporated with response surface method (RSM) was utilized to find out the impact of pH, time, initial concentration of Cd(II) and adsorbent dose on cadmium removal. Study discovered that adsorption operation is the quasi‐second‐order kinetic model and adapted more precisely with Langmuir adsorption model. The Langmuir highest uptake capacity of 34.72 mg/g at 298 K was acquired. The Elovich model recommended that the process is a kind of chemisorption. The calculated thermodynamic variables verified that the uptake process is endothermic and spontaneous. Additionally, the adsorbent can be simply separated with the aid of a magnet. In this study, we have suggested a practical method for the synthesis of the NiFe2O4/halloysite nanotubes/graphene quantum dots magnetic nanoparticles for cadmium removal from water.

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Relative distribution of Cd2+ adsorption mechanisms on biochars derived from rice straw and sewage sludge

Cited by 270 publications

References 41 publications

Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

Adsorption Behavior and Relative Distribution of Cd2+ Adsorption Mechanisms by the Magnetic and Nonmagnetic Biochars Derived from Chicken Manure

Preparation and characterization of Chicory leaf powder and its application as a nano-native plant sorbent for removal of Acid Blue 25 from aqueous media: isotherm, kinetic and thermodynamic study of the adsorption phenomenon

Experimental study and modelling of effective parameters on removal of Cd(II) from water by halloysite/graphene quantum dots magnetic nanocomposite as an adsorbent using response surface methodology

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