A facile foaming-polymerization strategy to prepare 3D MnO2 modified biochar-based porous hydrogels for efficient removal of Cd(II) and Pb(II)

Wu, Zhiying; Chen, Xiaoxiao; Yuan, Baoling; Fu, Ming‐Lai

doi:10.1016/j.chemosphere.2019.124745

Cited by 169 publications

(68 citation statements)

References 49 publications

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“…The number of pyridine nitrogen was higher than that of graphite nitrogen, which has been confirmed in studies with thiourea as an additional doped nitrogen source [15]. Pyridine nitrogen can promote the coordination of metal ions, and thus, is more favorable for the removal of metal ions [42]. , and S(-II) (160.6 eV) [35,43].…”

Section: Xps Analysis Of Biochar Before and After Modificationmentioning

confidence: 63%

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Zhu

Liang

et al. 2020

Water

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Removal of aquatic cadmium ions using biochar is a low-cost method, but the results are usually not satisfactory. Modified biochar, which can be a low-cost and efficient material, is urgently required for Cd-polluted water and soil remediation. Herein, poplar bark (SB) and poplar sawdust (MB) were used as raw materials to prepare modified biochar, which is rich in N- and S- containing groups, i.e., TSBC-600 and TMBC-600, using a co-pyrolysis method with thiourea. The adsorption characteristics of Cd2+ in simulated wastewater were explored. The results indicated that the modification optimized the surface structure of biochar, Cd2+ adsorption process by both TSBC-600 and TMBC-600 was mainly influenced by the initial pH, biochar dosage, and contact time, sthe TSBC-600 showed a higher adsorption capacity compared to TMBC-600 under different conditions. The Langmuir adsorption isotherm model and pseudo-second-order kinetic model were more consistent with the adsorption behavior of TSBC-600 and TMBC-600 to Cd2+, the maximum adsorption capacity of TSBC-600 and TMBC-600 calculated by the Langmuir adsorption isotherm model was 19.998 mg/g and 9.631 mg/g, respectively. The modification method for introducing N and S into biochar by the co-pyrolysis of biomass and thiourea enhanced the removal rate of aquatic cadmium ions by biochar.

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Section: Xps Analysis Of Biochar Before and After Modificationmentioning

confidence: 63%

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Zhu

Liang

et al. 2020

Water

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“…Similar to the biochar-based membrane, 3D biochar macrostructure could also be obtained using biochar as filler in a composite that can transform to 3D macrostructure. For example, fine biochar particles and cross-linking agents were mixed to get the porous hydrogel, after freezing dry, the 3D biochar aerogel can be obtained (Wu et al 2020). The as-fabricated 3D biochar macrostructure has good hydrophilicity, rich porosity, water retention, and it can maintain the gel shape without collapsing in the water (soil), thus showing great potential in heavy metals and organic pollutants remediation in water and soil.…”

Section: Biochar-based 3d Macrostructurementioning

confidence: 99%

Application of biochar-based materials in environmental remediation: from multi-level structures to specific devices

Wang

et al. 2020

Biochar

144

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The development of biochar has triggered a hot-spot in various research fields including agriculture, energy, environment, and materials. Biochar-based materials provide a novel approach against environmental challenging issues. Considering the rapid development of biochar materials, this review serves as a valuable platform to summarize the recent progress on the theoretical investigation and engineering applications of biochar materials in environmental remediation. For a better understanding of the structure-application relationships, the structural properties of biochar from macroscopic and microscopic aspects are summarized. The multilevel structures including elements, phases, surface chemistry, and molecular are highlighted to elucidate the multi-functional properties of biochars. Sorption, catalysis, redox reaction, and biological activity of biochar are briefly illustrated, which influence the transport, transformation, and removal of organic and inorganic pollutants in the environments. According to the multi-level structures and structure-application relationships of biochar, specific biocharbased materials and devices have been designed for practical environmental application. The important progress on the functionalization and device of biochar-based materials, including magnetic biochars, 2D and 3D biochar-based macrostructures, immobilized microorganism on biochar, and biochar-amended biofilters are highlighted. The environmental friendliness and sustainability of biochar-based materials, considering the whole cycle from synthesis to application, are evaluated.

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“…The maximum adsorption capacity of the composite was reported 63.58 mg/g. Wu, Chen, Yuan, and Fu () studied the effect of 3D MnO 2 modified biochar‐based porous hydrogels for removal of Cd (II) and Pb (II). The highest uptake of Ca (II) and Pb (II) was 84.76 and 70.90 mg/g, respectively .…”

Section: Introductionmentioning

confidence: 99%

Nitrate removal from aqueous solutions by adsorption onto hydrogel‐rice husk biochar composite

Afjeh

Marandi

Zohuriaan‐Mehr

2020

Water Environment Research

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In the present study, we investigated the performance of hydrogel-rice husk biochar composites, as low-cost, alternative, and biocompatible adsorbents for separating nitrate ions from aqueous solutions. Hydrogel-biochar composite was synthesized at dosages of 2.5%, 3.6%, 4.8%, and 9.6% weight ratios of biochar. The composite was characterized by several common methods including FTIR, SEM, TEM, TGA, and DSC. In addition, the effect of contact time, initial concentration of nitrate ions, and solution pH were considered. The maximum removal of nitrate was about 34.3% at acidic pH (pH = 3) using 0.02 g of adsorbent in 25 ml of nitrate solution with the initial concentration (20 mg/L) and temperature of 25°C for 60 min. Based on the findings, 5% biochar in the composite was the optimal dosage. Adsorption kinetic study revealed that this process followed the first-order kinetic model. The experimental equilibrium adsorption data were tested by the Temkin isotherm model with R 2 > 0.97. Based on the thermodynamic studies, the adsorption process was endothermic and spontaneous. Overall, the results suggested that the obtained composite can be specifically employed for removal of contaminations from aqueous solutions. © 2020 Water Environment Federation • Practitioner points• Hydrogel-biochar composite provides a biocompatible and cost-effective adsorbent. • Hydrogel-biochar composite was applied to eliminate nitrate from aqueous solutions. • Nitrate removal increased in the synthesized composite upon elevation of the weight ratio of biochar to 0.2 g.

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A facile foaming-polymerization strategy to prepare 3D MnO2 modified biochar-based porous hydrogels for efficient removal of Cd(II) and Pb(II)

Cited by 169 publications

References 49 publications

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

Application of biochar-based materials in environmental remediation: from multi-level structures to specific devices

Nitrate removal from aqueous solutions by adsorption onto hydrogel‐rice husk biochar composite

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