Adsorption of heavy metal ions by sodium alginate based adsorbent-a review and new perspectives

Gao, Xiangpeng; Guo, Cheng; Hao, Junjie; Zhao, Zhuo; Long, Hongming; Li, Mingyang

doi:10.1016/j.ijbiomac.2020.09.046

Cited by 384 publications

(131 citation statements)

References 139 publications

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“…The adsorption method has attracted the most interest to supply clean water in ancient cultures and is still commonly used in today's world because of its design and operation flexibility, low cost, simple and convenient to operate while still giving an excellent treatment efficiency [24]. Adsorption in general is a separation process that involves the removal of a substance (pollutants) from one phase (liquid or gas) followed by its accumulation at the other surface (adsorbent).…”

Section: Remediation By Adsorptionmentioning

confidence: 99%

Heavy Metals Removal from Water by Efficient Adsorbents

Zaimee

Sarjadi

Rahman

2021

Water

102

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Natural occurrence and anthropogenic practices contribute to the release of pollutants, specifically heavy metals, in water over the years. Therefore, this leads to a demand of proper water treatment to minimize the harmful effects of the toxic heavy metals in water, so that a supply of clean water can be distributed into the environment or household. This review highlights several water treatment methods that can be used in removing heavy metal from water. Among various treatment methods, the adsorption process is considered as one of the highly effective treatments of heavy metals and the functionalization of adsorbents can fully enhance the adsorption process. Therefore, four classes of adsorbent sources are highlighted: polymeric, natural mineral, industrial by-product, and carbon nanomaterial adsorbent. The major purpose of this review is to gather up-to-date information on research and development on various adsorbents in the treatment of heavy metal from water by emphasizing the adsorption capability, effect of pH, isotherm and kinetic model, removal efficiency and the contact of time of every adsorbent.

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Section: Remediation By Adsorptionmentioning

confidence: 99%

Heavy Metals Removal from Water by Efficient Adsorbents

Zaimee

Sarjadi

Rahman

2021

Water

102

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“…In addition to the environmental friendliness of SA, the carboxyl groups on its molecular chain can serve as an active site for adsorbing metal ions, and the reactive -OH group on its molecular chain can also be easily modified by grafting reaction to obtain hydrogel materials with more functional groups ( Wang and Wang, 2010 ). Due to the superior performance and eco-friendly advantages of SA, it has been widely used to prepare various polymer packing films ( Saravanakumar et al, 2020 ; Zhang et al, 2020 ), drug-delivery vehicles ( Mishra et al, 2021 ), antibacterial materials ( Dwivedi et al, 2020 ), carrier of catalyst ( Khan et al, 2020 ), superabsorbent hydrogel ( Kassem et al, 2020 ), coatings ( Fang et al, 2021 ) and adsorbent ( Wang et al, 2013a ; Gao et al, 2020 ). These materials derived from SA not only show excellent performance, but also exhibit unique eco-friendly advantages.…”

Section: Introductionmentioning

confidence: 99%

Fast and Highly Efficient Adsorption Removal of Toxic Pb(II) by a Reusable Porous Semi-IPN Hydrogel Based on Alginate and Poly(Vinyl Alcohol)

et al. 2021

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A porous semi-interpenetrating network (semi-IPN) hydrogel adsorbent with excellent adsorption properties and removal efficiency towards Pb(II) was prepared by a facile grafting polymerization reaction in aqueous medium using natural biopolymer sodium alginate (SA) as the main chains, sodium acrylate (NaA) as the monomers, and poly(vinyl alcohol) (PVA) as the semi-IPN component. FTIR, TGA and SEM analyses confirm that NaA monomers were grafted onto the macromolecular chains of SA, and PVA chains were interpenetrated and entangled with the crosslinked network. The incorporation of PVA facilitates to form pores on the surface of hydrogel adsorbent. The semi-IPN hydrogel containing 2 wt% of PVA exhibits high adsorption capacity and fast adsorption rate for Pb(II). The best adsorption capacity reaches 784.97 mg/g, and the optimal removal rate reaches 98.39% (adsorbent dosage, 2 g/L). In addition, the incorporation of PVA improved the gel strength of hydrogel, and the storage modulus of hydrogel increased by 19.4% after incorporating 2 wt% of PVA. The increase of gel strength facilitates to improve the reusability of hydrogel. After 5 times of regeneration, the adsorption capacity of SA-g-PNaA decreased by 23.2%, while the adsorption capacity of semi-IPN hydrogel only decreased by 10.8%. The adsorption kinetics of the hydrogel in the initial stage (the moment when the adsorbent contacts solution) and the second stage are fitted by segmentation. It is intriguing that the adsorption kinetics fits well with both pseudo-second-order kinetic model and pseudo-first-order model before 60 s, while only fits well with pseudo-second-order adsorption model in the whole adsorption process. The chemical complexing adsorption mainly contribute to the efficient capturing of Pb(II).

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“…In recent years, biological modification methods have become a research hotspot. The researchers have used natural sources, including sodium alginate [9], chitosan [10], and lignin [11,12], as raw materials, which were prepared into adsorption materials for removing heavy metal ions in sludge. They are widely used because of their environmental friendliness, non-toxicity, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Study on the Adsorption of Heavy Metals in Sludge by Calcium Alginate Cross-Linked Zeolite Microspheres

Ren¹,

Yao²,

Chai³

2021

Pol. J. Environ. Stud.

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This study successfully prepared a calcium alginate cross-linked zeolite microsphere, a heavy metal adsorbent, to reduce the harmful heavy metal content in sludge and improve the efficiency of sludge resource utilization. The effects of temperature, dosage, and stirring time on the adsorption effect were investigated by atomic absorption spectrophotometry and BCR (European Community Bureau of Reference) method, and the ecological risk of heavy metals in sludge before and after treatment was evaluated via the geoaccumulation index. The following results were obtained: after the sludge was treated with calcium alginate cross-linked zeolite microspheres, the total amount of heavy metals decreased, and the proportion of stable state increased. At temperatures within 10ºC-25ºC, the following trend was observed: the higher the temperature, the higher the adsorption efficiency. When the dosage was controlled at 0.5-2 g/500 ml and the stirring time was 2-3 h, a good adsorption effect was achieved. The pollution level of Pb and Zn in the sludge was reduced after adsorption treatment from unpolluted to moderately polluted to unpolluted, and that of Cd and Cu was reduced from moderately to heavily polluted to moderately polluted.

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Adsorption of heavy metal ions by sodium alginate based adsorbent-a review and new perspectives

Cited by 384 publications

References 139 publications

Heavy Metals Removal from Water by Efficient Adsorbents

Heavy Metals Removal from Water by Efficient Adsorbents

Fast and Highly Efficient Adsorption Removal of Toxic Pb(II) by a Reusable Porous Semi-IPN Hydrogel Based on Alginate and Poly(Vinyl Alcohol)

Study on the Adsorption of Heavy Metals in Sludge by Calcium Alginate Cross-Linked Zeolite Microspheres

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