A multi-functional-group modified cellulose for enhanced heavy metal cadmium adsorption: Performance and quantum chemical mechanism

Chen, Quan; Zheng, Jiewei; Wen, Liyang; Yang, Chen; Zhang, Lijuan

doi:10.1016/j.chemosphere.2019.02.138

Cited by 127 publications

(42 citation statements)

References 38 publications

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“…The results of the LIBS analysis proved the enhancement of binding sites after the polycondensation, which was also reported by Kumari et al [ 22 ]. Pb 2+ adsorption of CA–PU45 was due to OH, CO, and NH functional groups, which acted as the binding sites [ 43 ]. Previous studies reported the adsorbate–adsorbent interaction through the electrostatic force [ 44 , 45 ].…”

Section: Resultsmentioning

confidence: 99%

Characterization and Performance Evaluation of Cellulose Acetate–Polyurethane Film for Lead II Ion Removal

et al. 2020

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Global pollution from toxic metal waste has resulted in increased research on toxic metal adsorption. A cellulose acetate–polyurethane (CA–PU) film adsorbent was successfully prepared in this research. The cellulose acetate–polyurethane film adsorbent was prepared with a polycondensation reaction between cellulose acetate and methylene diphenyl diisocyanate. The CA–PU bond formation was confirmed by functional group analysis obtained from Fourier transform infrared (FTIR) spectroscopy. The obtained film was characterized for improved tensile and thermal properties with the addition of methylene diphenyl diisocyanate (MDI). The adsorption ability of the obtained film was evaluated with laser-induced breakdown spectroscopy (LIBS). The best film adsorbent from the LIBS was selected and studied for adsorption isotherm. The FTIR analysis confirmed the formation of the CA–PU bond from the polycondensation between cellulose acetate and the methylene diphenyl diisocyanate. The result showed that the addition of methylene diphenyl diisocyanate (MDI) resulted in the urethane network’s growth. The characterization result showed an improvement in the morphology, thermal stability, and tensile strength of the film. The LIBS studies showed improvement in the adsorption of Pb2+ with CA–PU compared with the neat CA. The isotherm studies revealed that Pb2+ adsorption by cellulose acetate–polyurethane film adsorbent was heterogeneously dependent on the Freundlich isotherm model (R2 = 0.97044). Overall, the polycondensation method proposed by this study enhanced the Pb2+ removal, and was comparable to those reported in previous studies.

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Section: Resultsmentioning

confidence: 99%

Characterization and Performance Evaluation of Cellulose Acetate–Polyurethane Film for Lead II Ion Removal

et al. 2020

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“…The peak of N1s at 397.9 eV for CS mats had a slight shift after neutralization, suggesting that ammonium ions were converted to amine groups [20]. The treated CS membrane could present in the aqueous medium stably after deprotonation treatment [32].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Chitosan Stacking Membranes for Adsorption of Copper Ions

Zhang

Shi

et al. 2019

Polymers

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Chitosan (CS) stacking mats with excellent performance for adsorption of copper ions (Cu(II)) in wastewater were fabricated by alternating electrospinning/electrospraying. The hierarchical structure of the stacking membranes was designed by CS micro-hemispheres sandwiched between CS fibers. The CS stack membranes prepared by the electrospinning technology could effectively increase the specific surface area, and thus, facilitate the adsorption of copper ions. CS stacking membranes with three layers reached adsorption equilibrium within 60 min, and had a maximum absorbance of 276.2 mg/g. The absorbance performance was superior to most of the reported CS adsorbents. Compared with CS fiber mats which were dominated by CS chemical structure during adsorption, the stacking structure of CS membranes contributed to the high efficient capability, and exhibited the multilayer adsorption behavior. This study may develop a promising method for the design of environmentally-friendly natural polymer adsorbents to remove Cu(II) in wastewater.

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“…In the beginning stage, many active binding sites were empty; the adsorbent gained metals by electrostatic attraction effectively. During the contact time, a huge quantity of metals were adsorbed, and most of the adsorption sites and pore spaces were involved, which weakened the metal adsorption capacity of the adsorbent [27,28]. Therefore, the beginning of all the trials in this research showed the removal percentages for all investigated metals increased rapidly (Figure 1).…”

Section: Effect Of Contact Time On Heavy Metals Adsorption Performancementioning

confidence: 79%

Investigation of Direct Applicability of Modified Agricultural Waste for Contaminant Removal from Real Textile Wastewater

Sapci-Ayas

2021

Water

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The textile industry produces enormous volumes of wastewater which must be treated effectively. In this study, biosorbent from the agricultural waste of potato peels (PP), which is environmentally friendly and easy to find everywhere, was used for the treatment of real textile wastewater. Physical modification, chemical activation, bio-hybrid and high-pressure modification processes were applied to PP to investigate the organic pollutant removal (chemical oxygen demand (COD)) and inorganic (Fe2+, Ni2+, Cu2+ and Cd2+) from original textile wastewater. Additionally, the effects of contact time (5, 15, 30, 60, 120, and 1440 min) and particle sizes (1.5–1.0 mm, 1.0–0.5 mm, and smaller than 0.5 mm in diameter) were investigated in a batch treatment system. Application of the physical modification process to PP presented an attractive solution for COD removal efficiency (69.50%) and removal efficiencies for four divalent metal ions; 78.6% for Cu2+, 63.6% for Ni2+, 40% for Fe2+, and 34.6% for Cd2+. FT-IR, SEM, and EDX analysis were performed to reveal the adsorption mechanism of the modified adsorbents. The FT-IR results indicate that the adsorption process fits the chemical and physical removal mechanisms, which were also supported by SEM images and EDX results.

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A multi-functional-group modified cellulose for enhanced heavy metal cadmium adsorption: Performance and quantum chemical mechanism

Cited by 127 publications

References 38 publications

Characterization and Performance Evaluation of Cellulose Acetate–Polyurethane Film for Lead II Ion Removal

Characterization and Performance Evaluation of Cellulose Acetate–Polyurethane Film for Lead II Ion Removal

Preparation of Chitosan Stacking Membranes for Adsorption of Copper Ions

Investigation of Direct Applicability of Modified Agricultural Waste for Contaminant Removal from Real Textile Wastewater

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