Clay–polymer nanocomposites: Progress and challenges for use in sustainable water treatment

Mukhopadhyay, Raj; Bhaduri, Debarati; Sarkar, Binoy; Rusmin, Ruhaida; Hou, Deyi; Khanam, Rubina; Sarkar, Subhasis; Biswas, Jayanta Kumar; Vithanage, Meththika; Bhatnagar, Amit; Ok, Yong Sik

doi:10.1016/j.jhazmat.2019.121125

Cited by 164 publications

(58 citation statements)

References 167 publications

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“…The solution pH is of great relevance for an adsorption process, because acidity affects (i) the aqueous speciation of the adsorbate, which is Ba 2+ in all experiments conducted in this study, (ii) the (de)protonation degree of the surface functional ≡Al–OH and ≡Si–OH groups of the adsorbents [ 13 , 41 ] and (iii) the charge distribution of the adsorbents [ 11 ]. The effect of solution pH on the adsorption of aqueous Ba 2+ by ALO, BEI and ZEO with (out) FeO-modification is seen in Figure 6 .…”

Section: Resultsmentioning

confidence: 99%

“…Currently available wastewater treatment technologies include, for example, chemical precipitation, flocculation, coagulation, electrochemical methods, reverse osmosis, membrane separation and adsorption [ 7 , 8 ]. However, these methods greatly vary in effectiveness and operational costs; thus there is still a high demand for the development of new, efficient, green and low cost adsorbent materials [ 9 , 10 , 11 ]. Silicate based adsorbents, such as clay minerals and zeolites, can be advantageous over non-siliceous materials or composite materials, because they provide a plenty of adsorption sites due to the very small particle size, high surface area, porous structure and presence of surface functional groups and exchangeable sites, rendering these components ideal for wastewater treatment [ 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents

et al. 2020

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Efficient capture of barium (Ba) from solution is a serious task in environmental protection and remediation. Herein, the capacity and the mechanism of Ba adsorption by natural and iron(III) oxide (FeO) modified allophane (ALO), beidellite (BEI) and zeolite (ZEO) were investigated by considering the effects of contact time, temperature, pH, Ba2+ concentration, adsorbent dosage, the presence of competitive ions and adsorption–desorption cycles (regenerability). Physicochemical and mineralogical properties of the adsorbents were characterized by XRD, FTIR, SEM with EDX and N2 physisorption techniques. The Ba2+ adsorption fitted to a pseudo-first-order reaction kinetics, where equilibrium conditions were reached within <30 min. BEI, ALO and ZEO with(out) FeO-modification yielded removal efficiencies for Ba2+ of up to 99.9%, 97% and 22% at optimum pH (pH 7.5–8.0). Adsorption isotherms fitted to the Langmuir model, which revealed the highest adsorption capacities for BEI and FeO-BEI (44.8 mg/g and 38.6 mg/g at 313 K). Preferential ion uptake followed in the order: Ba2+ > K+ > Ca2+ >> Mg2+ for all adsorbents; however, BEI and FeO-BEI showed the highest selectivity for Ba2+ among all materials tested. Barium removal from solution was governed by physical adsorption besides ion exchange, intercalation, surface complexation and precipitation, depending mainly on the absorbent type and operational conditions. BEI and FeO-BEI showed a high regenerability (>70–80% desorption efficiency after 5 cycles) and could be considered as efficient sorbent materials for wastewater clean-up.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents

et al. 2020

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“…PLA has been reinforced with MMT, 66 CNT, 67 graphene oxide (GO), 27 halloysite (H), 68 layered double hydroxide (LDH) 69 . Meanwhile, MMT and CNT are the most reported nanomaterials incorporated in polymers for functional properties enhancement owing to their lightweight, high physical and mechanical properties and conductivity, flexibility and high electromagnetic shielding efficiency 29,32,70‐72 .…”

Section: Poly(lactic Acid)‐based Nanocomposites: Rigid Nanofillersmentioning

confidence: 99%

Effect of rigid nanoparticles and preparation techniques on the performances of poly(lactic acid) nanocomposites: A review

Sanusi

Benelfellah

Bikiaris

et al. 2020

Polymers for Advanced Techs

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The global concern over the environmental protection and bio‐sustainability of plastic waste materials has prompted a vibrant search for renewable and biodegradable polymers in the academia and industrial sectors. Amidst other biopolymers, poly(lactic acid) (PLA) is identified as the most promising thermoplastic aliphatic polyester. PLA is derived from agricultural products with unique physical and mechanical properties that are comparable with the conventional petroleum‐derived polymers. Yet, some of the properties are insufficient for advanced materials applications. Rigid nanoparticles are incorporated in the PLA matrix to alleviate its properties for specific high‐performance applications. Here, we report various approaches of preparing functional PLA nanocomposites with emphasis on the strengths and weaknesses of each of the methods, as well as the achieved properties enhancement for a targeted application. Designing high‐performance PLA nanocomposite involves careful selection of the most appropriate nanofillers or combinations of nanofillers, preparation technique and processing parameters. Besides multi‐walled carbon nanotubes (CNT) and montmorillonite (MMT) that are prominent as nucleating agents to achieve high thermal and mechanical properties, other nanofillers like silver nanoparticles (AgNP) play critical roles in improving antibacterial and high‐performance properties of PLA.

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“…Clay minerals are plentiful in nature. Owing to the high specific surface area, excellent stability and tunable interlayer characteristics, clay minerals have been studied extensively as sorbents (Mukhopadhyay et al 2019), and recent studies have examined the feasibility of using clay minerals as immobilizing agents in soil remediation processes. For instance, a study by Liang et al (2019) used mercapto-modified attapulgite for the remediation of Cd contaminated alkaline agricultural soill.…”

Section: Introductionmentioning

confidence: 99%

Green remediation of Cd and Hg contaminated soil using humic acid modified montmorillonite: Immobilization performance under accelerated ageing conditions

Wang

Tsang

et al. 2020

Journal of Hazardous Materials

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105

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Clay–polymer nanocomposites: Progress and challenges for use in sustainable water treatment

Cited by 164 publications

References 167 publications

Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents

Removal of Barium from Solution by Natural and Iron(III) Oxide-Modified Allophane, Beidellite and Zeolite Adsorbents

Effect of rigid nanoparticles and preparation techniques on the performances of poly(lactic acid) nanocomposites: A review

Green remediation of Cd and Hg contaminated soil using humic acid modified montmorillonite: Immobilization performance under accelerated ageing conditions

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