A novel modified method for the efficient removal of Pb and Cd from wastewater by biochar: Enhanced the ion exchange and precipitation capacity

Wu, Jiawen; Wang, Tao; Wang, Jiawei; Zhang, Yongsheng; Pan, Wei‐Ping

doi:10.1016/j.scitotenv.2020.142150

Cited by 294 publications

(97 citation statements)

References 42 publications

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“…4 e), which also suggest that the peak area of − COOH decreased from 53.8 to 36.1% while the peak area of C–O increased slightly from 24.9 to 26.6%. These results indicate that the adsorbed Pb 2+ formed bidentate complexes (–O–Pb–O–) rather than monodentate complexes (–O–Pb–OH) 55 . Furthermore, the Pb4f.…”

Section: Resultsmentioning

confidence: 83%

Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution

Liu

Chen

et al. 2022

Sci Rep

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Lead (Pb) and cadmium (Cd) are toxic heavy metals commonly found in aqueous environments. Biochar as a green adsorbent generated from biomass feedstock may be used for effective removal of these heavy metals. This study investigated the adsorption kinetics and isotherms of Pb2+ and Cd2+ in aqueous solutions at different pH by biochar prepared from banana stem and leaf (BSL-BC) at 400 °C. Characterizations using scanning electron microscope, X-ray diffraction, and Fourier-transform infrared spectroscopy showed that the synthesized BSL-BC had rough surface, porous structure, and oxygen-containing functional groups. The adsorption of Pb2+ and Cd2+ onto BSL-BC reached equilibrium in 8 h and 200 min, respectively, with faster adsorption attained at higher pH and the optimum pH occurred at 5 (Pb2+) and 8 (Cd2+). All adsorption kinetic data followed the pseudo-second-order rate model. The adsorption isotherm data of Pb2+ and Cd2+ could be well-described by the Langmuir and Freundlich models, respectively, whereas neither the Temkin or Dubinin–Radushkevich models provided satisfactory fitting results. The maximum adsorption capacities for Pb2+ and Cd2+ were 302.20 and 32.03 mg/g, respectively. The calculated mechanism contributions showed that complexation with oxygen-containing functional groups, ion exchange, mineral precipitation, and Pb2+/Cd2+-π coordination accounted for 0.1%, 8.4%, 88.8%, and 2.6% to Pb2+ adsorption, and 0.4%, 6.3%, 83.0%, and 10.4% to Cd2+ adsorption, respectively. Therefore, mineral precipitation was likely the major mechanism responsible for adsorption of both Pb2+ and Cd2+ by BSL-BC. The results suggest that the synthesized BSL-BC has great potential for adsorption of Pb2+ and Cd2+ from aqueous solutions.

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Section: Resultsmentioning

confidence: 83%

Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution

Liu

Chen

et al. 2022

Sci Rep

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“…The improvement of adsorption performance in low concentrations (0.001 M) can be explained by the addition of NO 3 − (from KNO 3 or Mg(NO 3 ) 2 )which can be attached on the surface of CTS/CA/BT composite hydrogel. A high concentration of Mg 2+ (0.1 mol·L −1 ) caused decline of the heavy metal adsorption capacities, and these may have resulted from diffusion rate of Mg 2+ with a smaller ion radius being greater than the that of the other ions [ 49 ]. The presence of negative ions can compete for the available adsorption receptor sites of CTS/CA/BT composite hydrogel thus diminishing the electrostatic repulsion to heavy metal ions.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

et al. 2021

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In order to avoid the secondary pollution of the toxic residue of chemical crosslinking agent accompanied by chemical hydrogel adsorbent and enhance the adsorption performance of physical hydrogel, chitosan/calcium alginate/bentonite (CTS/CA/BT) composite physical hydrogel was constructed. The formation mechanism and structure of the composite hydrogel were determined by FTIR, XRD and SEM. Adsorption performances of the hydrogel toward Pb2+, Cu2+ and Cd2+ in water under different condition as well as multi-ion competitive sorption were investigated. The adsorption processes were described with the canonical adsorption kinetics and isotherms models. With the utilization of XPS analysis and adsorption thermodynamics analysis, it was found that the adsorptions were spontaneous physico-chemical adsorptions. The results showed that the maximum adsorption capacity of the hydrogel for Pb2+, Cu2+ and Cd2+ reached up to 434.89, 115.30 and 102.38 mg·g−1, respectively, better than those of other physical hydrogels or chitosan/bentonite composite. Moreover, the composite hydrogel improved the collectability of bentonite and showed a good reusability. The modification of bentonite and the formation of hydrogel were completed simultaneously, which greatly simplifies the operation process compared with the prior similar works. These suggest that the CTS/CA/BT composite hydrogel has promising application prospects for removal of heavy metal ions from water.

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“…BC is similar with AC, or there is no clear boundary between them in the studies and utilization of them in heavy metal adsorption. [32] Moreover, in a recent study, [33] the improvement of the ion exchange and precipitation capacity of BC can effectively improve the removal capacity of Pb 2+ and Cd 2+ in wastewater.…”

Section: Introductionmentioning

confidence: 97%

An overview of low‐temperature plasma surface modification of carbon materials for removal of pollutants from liquid and gas phases

Huang

et al. 2020

Plasma Processes & Polymers

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As a promising surface treatment technique, low‐temperature plasma (LTP) technology has been widely used over the past two decades. Herein, the surface modification of carbon materials using LTP treatment is reviewed to clarify the modification effects. First, the basic details of LTP treatment are summarized. Second, the surface morphology, pore structure, surface chemistry, adsorption performance, and catalytic characteristics of LTP‐treated carbon materials are reviewed. Finally, the research required to further develop LTP technology for the surface modification of carbon materials is discussed. This review will contribute toward advancing the application of LTP‐treated carbon materials in environmental pollution control.

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A novel modified method for the efficient removal of Pb and Cd from wastewater by biochar: Enhanced the ion exchange and precipitation capacity

Cited by 294 publications

References 42 publications

Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution

Banana stem and leaf biochar as an effective adsorbent for cadmium and lead in aqueous solution

Preparation of Chitosan/Calcium Alginate/Bentonite Composite Hydrogel and Its Heavy Metal Ions Adsorption Properties

An overview of low‐temperature plasma surface modification of carbon materials for removal of pollutants from liquid and gas phases

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