Hydrogel composites containing nanocellulose as adsorbents for aqueous removal of heavy metals: design, optimization, and application

Rodrigues, Francisco H. A.; Magalhães, Carlos Emanuel de Carvalho; Medina, Aline Lisbôa; Fajardo, André R.

doi:10.1007/s10570-019-02736-y

Cited by 36 publications

(9 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because cellulose is the most abundant biopolymer in nature, cellulose materials have been extensively examined for versatile applications, as they possess qualities such as sustainability, biodegradability, renewability, low cost, and high availability (Zhu et al 2020a,b,c;Wang et al 2022b). Cellulose adsorbents have also gained increased attention over the past three decades (Rodrigues et al 2019;Varghese et al 2019;Köse et al 2020a). The insolubility of cellulose has become an advantage but also a bottleneck for its application.…”

Section: Introductionmentioning

confidence: 99%

TEMPO-oxidized cellulose beads for cationic dye adsorption

Wang

Liu

Chen

et al. 2022

BioRes

View full text Add to dashboard Cite

Toxic organic dyes present in wastewater should be removed before discharge. In this study, TEMPO-oxidized, regenerated cellulose beads were prepared using a simple falling ball technique for cationic methylene blue (MB) removal. The obtained cellulose beads were characterized using various analytical techniques. The results indicated that TEMPO-oxidized cellulose beads displayed porous structures with high content of carboxylic acid groups. Thus, the negatively charged cellulose beads can effectively adsorb cationic MB with an adsorption capacity of 495 mg/g at a starting concentration of 100 mg/L. This simple one-step adsorption process achieved near-complete MB removal at pH 7, indicating strong electrostatic interactions between cationic MB and negatively charged oxidized cellulose beads. The experimental data can be well described by the Langmuir isotherm model and the Pseudo-second-order model. The fabricated cellulose beads exhibit great potential for practical application in dye removal from wastewater.

show abstract

Section: Introductionmentioning

confidence: 99%

TEMPO-oxidized cellulose beads for cationic dye adsorption

Wang

Liu

Chen

et al. 2022

BioRes

View full text Add to dashboard Cite

show abstract

Section: Modifications In Cellulosementioning

confidence: 99%

Critical Review of Bioadsorption on Modified Cellulose and Removal of Divalent Heavy Metals (Cd, Pb, and Cu)

Kaur

Sengupta

Mukhopadhyay³

2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Heavy metal contamination in soil and water has become a serious threat to all forms of life. Finding a sustainable remediation method is the prime concern of researchers worldwide. In this quest, cellulose has emerged as a biocompatible, biodegradable, renewable, tunable, and cost-effective bioadsorbent for heavy metal removal from polluted water. Cellulose is rich in hydroxyl groups which can be chemically modified to enhance the reactivity, binding sites, and mechanical strength. Cellulose in nano size, i.e., nanofibers and nanocrystals, offer myriad opportunities to improve the aspect ratio, surface area, pore size, and hydrophilicity for effective adsorption. In this review, chemical and physical modifications in cellulose (functional group transformations, nanocellulose, nanocomposites, hydrogels, aerogels, beads, and membranes) with respect to adsorption of divalent heavy metal ions, in particular, Pb 2+ , Cu 2+ , and Cd 2+ , have been extensively discussed. This review also examines the effect of pH, concentration, temperature, and contact time on the adsorption process. Different mechanisms for heavy metal removal such as ion exchange, electrostatic interactions, complexation, chelation, precipitation, and reduction have been discussed. Theoretical insights into the mechanisms of adsorbent−adsorbate binding are critically examined in the context of modified cellulose. The authors, in the concluding section, summarize potential research directions toward developing sustainable biosorbents.

show abstract

“… ( a ) The maximum adsorption capacity for Cu 2+ with different cellulose-based adsorbents was compared with CMCNFs-PEI aerogels: Cu 2+ adsorption capacity in this work, pomelo peel carboxylated cellulose nanofibers-PEI (POCNF-PEI) [ 24 ]; polydopamine-CNF-PEI (PDA-CNF-PEI) [ 25 ]; carboxymethylated CNFs (CMCNF-2.7) [ 26 ]; NFC/PEI composite aerogel (NPAs) [ 15 ]; NFCs/poly(2-(dimethylamino) ethyl methacrylate) interpenetrating network hydrogels (NPIHs) [ 27 ]; cellulose nanowhiskers (CNWs) [ 28 ]. ( b ) Effect of temperature on the Cu 2+ adsorption of CMCNF30-PEI.…”

Section: Figurementioning

confidence: 99%

Nanoarchitectonics for High Adsorption Capacity Carboxymethyl Cellulose Nanofibrils-Based Adsorbents for Efficient Cu2+ Removal

Si¹,

Chen²,

Wang³

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

In the present study, carboxymethyl cellulose nanofibrils (CMCNFs) with different carboxyl content (0.99–2.01 mmol/g) were prepared via controlling the ratio of monochloroacetic acid (MCA) and sodium hydroxide to Eucalyptus bleached pulp (EBP). CMCFs-PEI aerogels were obtained using the crosslinking reaction of polyethyleneimine (PEI) and CMCNFs with the aid of glutaraldehyde (GA). The effects of pH, contact time, temperature, and initial Cu2+ concentration on the Cu2+ removal performance of CMCNFs-PEI aerogels was highlighted. Experimental data showed that the maximum adsorption capacity of CMCNF30-PEI for Cu2+ was 380.03 ± 23 mg/g, and the adsorption results were consistent with Langmuir isotherm (R2 > 0.99). The theoretical maximum adsorption capacity was 616.48 mg/g. After being treated with 0.05 M EDTA solution, the aerogel retained an 85% removal performance after three adsorption–desorption cycles. X-ray photoelectron spectroscopy (XPS) results demonstrated that complexation was the main Cu2+ adsorption mechanism. The excellent Cu2+ adsorption capacity of CMCNFs-PEI aerogels provided another avenue for the utilization of cellulose nanofibrils in the wastewater treatment field.

show abstract

Hydrogel composites containing nanocellulose as adsorbents for aqueous removal of heavy metals: design, optimization, and application

Cited by 36 publications

References 48 publications

TEMPO-oxidized cellulose beads for cationic dye adsorption

TEMPO-oxidized cellulose beads for cationic dye adsorption

Critical Review of Bioadsorption on Modified Cellulose and Removal of Divalent Heavy Metals (Cd, Pb, and Cu)

Nanoarchitectonics for High Adsorption Capacity Carboxymethyl Cellulose Nanofibrils-Based Adsorbents for Efficient Cu2+ Removal

Contact Info

Product

Resources

About