Nano iron oxides impregnated chitosan beads towards aqueous Cr(VI) elimination: Components optimization and performance evaluation

Lǚ, Jianbo; Li, Baixue; Li, Wanlu; Zhang, Xintong; Zhang, Wei; Zhang, Peng; Su, Runxi; Liu, Dongfang

doi:10.1016/j.colsurfa.2021.126902

Cited by 22 publications

(10 citation statements)

References 41 publications

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“…The pH is one of the factors that affect the performance of the adsorbent. The solution pH affects the protonation/deprotonation of the adsorbate and the surface charge of the adsorbent 4 . The effect of pH from 6.0 to 10.0 on the removal rate of Cr(VI) was investigated under the condition that other factors were kept constant.…”

Section: Resultsmentioning

confidence: 99%

“…Chromium is a serious threat to aquatic organisms and human health, so chromium removal from wastewater is necessary and urgent 3 . Among the many chromium removal techniques, adsorption is now an efficient and economical solution due to its high removal rate, high regeneration potential, low initial cost, simple design, and ease of operation 4 . Various adsorbents such as metal oxides, activated carbon, and biomaterials are present in the market.…”

Section: Introductionmentioning

confidence: 99%

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Study on adsorption of hexavalent chromium by composite material prepared from iron-based solid wastes

Zhou

et al. 2023

Sci Rep

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A new adsorbent with chromium removal function was synthesized by carbon thermal method using iron-containing waste Fenton sludge and carbon-containing solid waste fly ash to treat high pH scoring wastewater generated from industrial processes. The results showed that the adsorbent used T = 273.15 K, pH = 10, t = 1200 min, C0 = 100 mg/L, had a removal rate of Cr(VI) of more than 80%, and the adsorption capacity could reach 393.79 mg/g. The characterization results show that the synthesized mesoporous nitrogen-doped composite material has a large specific surface area and mesoporous structure, and the surface of the material is rich in oxygen-containing functional groups and active sites. Compared with other studies, the adsorption capacity of the material is larger, which indicates that the removal effect of Cr(VI) in this study is better. The adsorption kinetic results show that the adsorption follows a pseudo second kinetic model, and the adsorption process is a chemisorption involving electron sharing or electron exchange. This experiment designed a simple method to synthesize mesoporous nitrogen-doped composites using industrial solid waste, with raw materials from cheap and easily available industrial solid waste, and solved the dual problems of heavy metals in wastewater and solid waste, providing a new idea for the resource utilization of Fenton sludge while not producing secondary pollution.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on adsorption of hexavalent chromium by composite material prepared from iron-based solid wastes

Zhou

et al. 2023

Sci Rep

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“…The change in Fe2p also suggests that some part of Cr(VI) was adsorbed by reduction to Cr(III), followed by Cr(III) adsorption by reacting with Fe 2+ was followed. The Cr2p spectrum of Cr(VI) adsorbed Fe@FWB-OPT is deconvoluted as Cr(III) at 576.8 and 586.7 eV and Cr(VI) at 579 eV (Lu et al 2021). The Cr2p spectrum indicates that the adsorbed chromium is adsorbed not only as Cr(VI) but also as Cr(III) after the reduction of Cr(VI).…”

Section: Characteristics Of Fe@fwb-opt Before and After Cr(vi) Adsorption And Its Mechanism Studymentioning

confidence: 99%

Application of Response Surface Methodology and Artificial Neural Network for The Preparation of Fe-Loaded Biochar for Enhanced Cr(VI) Adsorption and Its Cr(VI) Adsorption Characteristics in an Aqueous Solution

Kang

Seo

Lee

et al. 2022

Preprint

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In this study, we optimized and explored the effect of the conditions for synthesizing Fe-loaded food waste biochar (Fe@FWB) for Cr(VI) removal using the response surface methodology (RSM) and artificial neural network (ANN). The pyrolysis time, temperature, and Fe concentration were selected as the independent variables, and the Cr(VI) adsorption capacity of Fe@FWB was maximized. RSM analysis showed that the p-values of pyrolysis temperature and Fe concentration were less than 0.05, indicating that those variables were statically significant, while pyrolysis time was less significant due to its high p-value (0.2830). However, the ANN model results showed that the effect of pyrolysis time was more significant on Cr(VI) adsorption capacity than Fe concentration. The optimal conditions, determined by the RSM analysis with a lower sum of squared error than ANN analysis, were used to synthesize the optimized Fe@FWB (Fe@FWB-OPT) for Cr(VI) removal. From the equilibrium model fitting, the Langmuir model showed a better fit than the Freundlich model, while the Redlich–Peterson isotherm model overlapped. The Cr(VI) sorption capacity of Fe@FWB-OPT calculated from the Langmuir model was 377.71 mg/g, high enough to be competitive to other adsorbents. The kinetic Cr(VI) adsorption was well described by the pseudo-second-order and Elovich models. The XPS results showed that Cr adsorbed on the surface of Fe-FWB-OPT was present not only as Cr(VI) but also as Cr(III) by the reduction of Cr(VI). The results of Cr(VI) adsorption by varying the pH indicate that electrostatic attraction is a key adsorption mechanism.

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“…The adsorption method is highly recommended owing to its effectiveness, simplicity, and availability of a wide range of adsorbent materials 7 . Nowadays, a great number of materials were identified to exhibit good affinity to Cr(VI) and thus were effectively applied to eliminate it from water including metal oxides 8 , biochars 9 and carbonaceous nanoparticles 10 . One of the drawbacks of the adsorption method is the long time that is needed to reach the equilibrium conditions and obtain the maximum recovery percentage 11 .…”

Section: Introductionmentioning

confidence: 99%

“…were identified to exhibit good affinity to Cr(VI) and thus were effectively applied to eliminate it from water including metal oxides 8 , biochars 9 and carbonaceous nanoparticles 10 . One of the drawbacks of the adsorption method is the long time that is needed to reach the equilibrium conditions and obtain the maximum recovery percentage 11 .…”

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confidence: 99%

Inclusion of bimetallic Fe0.75Cu0.25-BDC MOFs into Alginate-MoO3/GO as a novel nanohybrid for adsorptive removal of hexavalent chromium from water

Mahmoud

Amira

Azab

et al. 2022

Sci Rep

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Metal–organic frameworks (MOFs) as porous materials have recently attracted research works in removal of toxic pollutants from water. Cr(VI) is well-known as one of the most toxic forms of chromium and the selection of efficient and effective Cr(VI)-remediation technology must be focused on a number of important parameters. Therefore, the objective of this work is to fabricate a novel nanohybrid adsorbent for removal of Cr(VI) by using assembled bimetallic MOFs (Fe0.75Cu0.25-BDC)-bound- Alginate-MoO3/Graphene oxide (Alg-MoO3/GO) via simple solvothermal process. The aimed Fe0.75Cu0.25-BDC@Alg-MoO3/GO nanohybrid was confirmed by FTIR, SEM, TEM, XRD and TGA. Adsorptive extraction of Cr(VI) from aqueous solution was aimed by various optimized experimental parameters providing optimum pH = 3, dosage = 5–10 mg, starting concentration of Cr(VI) = 5–15 mg L−1, shaking time = 5–10 min. The point of zero charge (pHPzc) was 3.8. For Cr(VI) removal by Fe0.75Cu0.25-BDC@Alg-MoO3/GO, four isotherm models were estimated: Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) with calculated correlation coefficient (R2 = 0.9934) for Langmuir model which was higher than others. The collected results from the kinetic study clarified that pseudo-second order model is the most convenient one for describing the adsorption behavior of Cr(VI) and therefore, the adsorption process was suggested to rely on a chemisorption mechanism. Thermodynamic parameters referred that the adsorption mechanism is based on a spontaneous and exothermic process. Finally, the emerged Fe0.75Cu0.25-BDC@Alg-MoO3/GO nanohybrid was confirmed as an effective adsorbent for extraction of hexavalent chromium from real water specimens (tap, sea water and wastewater) with percentage recovery values > 98%.

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Nano iron oxides impregnated chitosan beads towards aqueous Cr(VI) elimination: Components optimization and performance evaluation

Cited by 22 publications

References 41 publications

Study on adsorption of hexavalent chromium by composite material prepared from iron-based solid wastes

Study on adsorption of hexavalent chromium by composite material prepared from iron-based solid wastes

Application of Response Surface Methodology and Artificial Neural Network for The Preparation of Fe-Loaded Biochar for Enhanced Cr(VI) Adsorption and Its Cr(VI) Adsorption Characteristics in an Aqueous Solution

Inclusion of bimetallic Fe0.75Cu0.25-BDC MOFs into Alginate-MoO3/GO as a novel nanohybrid for adsorptive removal of hexavalent chromium from water

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