Treatment of wastewater containing Cu2+ using a novel macromolecular heavy metal chelating flocculant xanthated chitosan

Yang, Kai; Wang, Gang; Chen, Xuemin; Wang, Xin; Liu, Fulong

doi:10.1016/j.colsurfa.2018.06.082

Cited by 45 publications

(13 citation statements)

References 30 publications

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“…The maximum removal efficiency of Cu(II) was less than 92.4% in the treatment of Cu(II) single polluted sewage. However, the removal efficiency of Cu(II) could reach 93.6% in the treatment of turbidity-Cu(II) binary polluted sewage (Yang et al 2018 ). The presence of turbidity could enhance the removal efficiency of biopolymer-based flocculants on heavy metal ions, but this enhancement only existed within a certain turbidity range (Sun et al 2020b ).…”

Section: Recent Applications Of Biopolymer-based Flocculantsmentioning

confidence: 99%

“…In addition, the pH value of sewage has a great influence on removing heavy metal ions by biopolymer-based flocculants. The lower the pH is, the less favorable it is for biopolymer-based flocculants to remove heavy metal ions (Sun et al 2019b ; Yang et al 2018 ; Wu et al 2018 ). In the low pH condition, some functional groups on biopolymer-based flocculants were protonated, and positive charges were accumulated on the molecular chain.…”

Section: Recent Applications Of Biopolymer-based Flocculantsmentioning

confidence: 99%

“…In the low pH condition, some functional groups on biopolymer-based flocculants were protonated, and positive charges were accumulated on the molecular chain. It reduced the chelating ability of functional groups (Sun et al 2019b ), and decreased the collision of biopolymer-based flocculants with heavy metal ions (Yang et al 2018 ).…”

Section: Recent Applications Of Biopolymer-based Flocculantsmentioning

confidence: 99%

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Biopolymer-based flocculants: a review of recent technologies

Jiang

Li²,

Tang

et al. 2021

Environ Sci Pollut Res

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Biopolymer-based flocculants have become a potential substitute for inorganic coagulants and synthetic organic flocculants due to their wide natural reserves, environmental friendliness, easy natural degradation, and high material safety. In recent years, with more and more attention to clean technologies, a lot of researches on the modification and application of biopolymer-based flocculants have been carried out. The present paper reviews the latest important information about the base materials of biopolymer-based flocculants, including chitosan, starch, cellulose, and lignin etc. This review also highlights the various modification methods of these base materials according to reaction types in detail. Via the recent researches, the flocculation mechanisms of biopolymer-based flocculants, such as adsorption, bridging, charge neutralization, net trapping, and sweeping, as well as, some other special mechanisms are comprehensively summarized. This paper also focuses on the water treatment conditions, the removal efficiency, and advantages of biopolymer-based flocculants in applications. Further, this review sheds light on the future perspectives of biopolymer-based flocculants, which may make progress in the sources of base materials, modification processes, multi-function, and deepening application researches. We believe that this review can guide the further researches and developments of biopolymer-based flocculants in the future, to develop them with a higher efficiency, a lower cost, more safety, and multi-function for more diversified applications.

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Section: Recent Applications Of Biopolymer-based Flocculantsmentioning

confidence: 99%

Section: Recent Applications Of Biopolymer-based Flocculantsmentioning

confidence: 99%

Section: Recent Applications Of Biopolymer-based Flocculantsmentioning

confidence: 99%

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Biopolymer-based flocculants: a review of recent technologies

Jiang

Li²,

Tang

et al. 2021

Environ Sci Pollut Res

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“…Langmuir isotherm with R 2 0.999 revealed the q max of 174 and 128 mg/g, respectively for Cu(II) and Ni(II). Another non‐crosslinked XCTS for flocculation and removal of Cu(II) was prepared by imination of the amino groups of CTS with benzaldehyde and then reaction of hydroxyl groups of CTS with CS 2 in an alkaline medium (Figure 3a) [97] . This derivative could remove more than 97 % of the Cu(II) in concentration 50 mg/L, however, by reducing the initial copper concentration the removal of copper reduced slightly.…”

Section: Thiolated Chitosansmentioning

confidence: 99%

“… Synthesis of xanthates (a) [97] and (b); dithiocarbamate (c); GA‐thiourea (d) and dithiooxamide (e) derivatives of chitosan.…”

Section: Thiolated Chitosansmentioning

confidence: 99%

Thiomers of Chitosan and Cellulose: Effective Biosorbents for Detection, Removal and Recovery of Metal Ions from Aqueous Medium

Seidi

Saeb

Huang

et al. 2021

The Chemical Record

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Removal of toxic metal ions using adsorbents is a well‐known strategy for water treatment. While chitosan and cellulose can adsorb weakly some types of metals, incorporating thiols as metal chelating agents can improve their sorption behaviors significantly. Presented in this review are the various chemical modification strategies applicable for thiolation of chitosan and cellulose in the forms of mercaptans, xanthates and dithiocarbamates. Moreover, much attention has been paid to the specific strategies for controlling the thiolation degree and characterization approaches for establishing the structure‐property relationship. Also, the kinetics and isotherm models that elucidate the adsorption processes and mechanisms induced by the thiomers have been explained. These thiomers have found great potentials in the applications associated with metal removal, metal recovery and metal detection.

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