Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution

Ren, Zhaogang; Chen, Fang; Wang, Bin; Song, Zhongxian; Zhou, Ziyu; Ren, Dong

doi:10.4491/eer.2019.232

Cited by 47 publications

(8 citation statements)

References 44 publications

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“…The maximum adsorption capacity of Co/N-mC adsorbent for MO and RhB respectively is 178 mg g −1 and 141 mg g −1 . As listed in Table 1, compared with magnetic porous carbon [33], CMK-3 [34], magnetic biochar [35], N-doped carbons [36] and other types of adsorbents [37][38][39], Co@N-mC composites presented higher adsorption activity for RhB or MO. The adsorption capacity over Co@N-mC composites was sequenced by MO > RhB might be caused by (1) small sized MO need shorter time but adsorption amount might be increased which the porosity of carbon plays a leading role.…”

Section: Resultsmentioning

confidence: 99%

In-situ carbonization of ZIF-67 to fabricate magnetically Co/N-mC with high adsorption capacity toward water remediation

2021

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Co and N co-modified mesoporous carbon composites (Co/N-mC) have been simply prepared at low cost from the carbonization of ZIF-67 wherein not only providing surface N-modification for promoting the adsorption behavior of acidic dyes, but also constructing a magnetic property for convenient separation. Co/N-mC composite presented the adsorption ability of MO (178 mg g−1) > RhB (141 mg g−1) (T = 25 °C, pH = 7.0, C0 = 20 mg L−1) because of its spacious porous structure (BET: 250.8 m2 g−1; pore size: 3.9 nm) and functional basic character (pyrrolic-N and pyridinic-N). Compared with basic dyes (RhB), mesoporous C doped with N improves the adsorption of acid dyes (MO). In addition, the magnetic properties introduced in the Co/N-mC make it easier to separate after adsorption and regeneration by an external magnetic field.

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Section: Resultsmentioning

confidence: 99%

In-situ carbonization of ZIF-67 to fabricate magnetically Co/N-mC with high adsorption capacity toward water remediation

2021

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“…The information mentioned above suggested that uptake of CR would be restricted by the ionic strength. Due to salting out effect resulted from NaCl, CR dissolvability in the aqueous solution decreased, which may lead to the agglomeration of CR, and then hydrophobicity of CR increased (Fang et al , 2020; Ren et al , 2020). It can be seen from the figure that for the three adsorbents, presence of NaCl exhibited a positive effect on adsorption, and with increasing ionic strength the adsorption capacity of PAn for CR was little influenced and gradually increased.…”

Section: Resultsmentioning

confidence: 99%

Polyaniline dispersed by Kevlar fiber for uptake of organic dye

Liu

Tian

et al. 2020

PRT

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Purpose This paper aims to focus on the preparation of Kevlar fiber (KF) and alkaline hydrolyzed KF (KF-H) to improve the dispersed condition of polyaniline (PAn), as the aggregation of PAn would lead to some adsorption sites buried. And then the materials were used to enrich anionic dye Congo red (CR) from aqueous solution. Design/methodology/approach The materials (KF@PAn and KF-H@PAn) were designed by means of “diffusion-interfacial-polymerization” under mild condition as high affinity due to the structural properties of PAn, KF and KF-H. The dispersed degree of PAn on the surface of KF and KF-H was validated according to adsorption efficiency for CR. Findings The content of PAn introduced was not beyond 20 wt.%, while adsorption capacity for CR was significantly enhanced by 4–8 times (on the basis of kinetic data) according to the calculation only by the content of PAn due to KF and alkaline hydrolyzed KF exhibited almost no adsorption for CR, indicating dispersed situation of PAn coating was greatly enhanced and more active sites exposed, which was favorable for the adsorption process. Presence of NaCl would exhibit a more or less positive effect on CR uptake, suggesting the materials could be used for high salt environment. Research limitations/implications The investigated means of dispersed degree of PAn on the surface of KF and KF-H are the further and future investigation. Practical implications This study will provide a method to improve the dispersed situation of PAn and a theoretical support to treat anionic dyes from aqueous solution especially for salt environment. Originality/value The results showed that the dispersed condition of PAn on the surface of KF and KF-H was greatly improved. According to the adsorption capacities for CR, it can be concluded that part of adsorption sites were buried due to the aggregation of PAn, and introduction of KF and KF-H, buried adsorption sites decreased greatly. This study will provide a method to decrease buried adsorption sites of PAn and a contribution for their convenient application in wastewater treatment especially for high salt environment.

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“…Biosorption isotherms can represent the interaction between a biosorbate and biosorbent, and provide information about the distribution of the biosorbate between the liquid and solid phases at several equilibrium concentrations. Isotherm modeling is therefore important for biosorption data interpretation and prediction [7,26]. In this study, isotherm models of Langmuir and Freundlich isotherm models were used to interpret the experimental isotherm data of RCS.…”

Section: Isothermsmentioning

confidence: 99%

Removal of Various Heavy Metals by Sewage Sludge Immobilized Onto Rod-type Chitosan Biosorbent

Seo¹,

Kim²,

Park³

et al. 2021

Preprint

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The potential use of wastewater sludge as a biosorbent for removing various metals and metalloids from aqueous solutions was examined. The sludge was immobilized by chitosan into rods to enhance the sorption capacity and solid-liquid separation ability. An optimum condition of rod-type chitosan-immobilized sludge (RCS) was selected from possibility of produced biosorbent and the removal efficiency of As(V). The optimal sludge and chitosan content and RCS thickness was 6.0%, 4.0% and 0.2-0.3 mm, respectively. The experiments targeted cations(Cd(II)) and anions(As(V), Cr(VI), and Mn(VII)). Pseudo-first-order and pseudo-second-order models adequately described kinetics models and Langmuir and Freundlich models described isotherm models for RCS, which showed higher adsorption ability for anionic metals over cationic metals. The results indicate that electrostatic attraction or ion exchange is the most important mechanism for metal/metalloid adsorption, except in the case of Mn(VII), for which an adsorption-coupled reduction mechanism is suggested.

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Magnetic biochar from alkali-activated rice straw for removal of rhodamine B from aqueous solution

Cited by 47 publications

References 44 publications

In-situ carbonization of ZIF-67 to fabricate magnetically Co/N-mC with high adsorption capacity toward water remediation

In-situ carbonization of ZIF-67 to fabricate magnetically Co/N-mC with high adsorption capacity toward water remediation

Polyaniline dispersed by Kevlar fiber for uptake of organic dye

Removal of Various Heavy Metals by Sewage Sludge Immobilized Onto Rod-type Chitosan Biosorbent

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