The distribution of Pb(II)/Cd(II) adsorption mechanisms on biochars from aqueous solution: Considering the increased oxygen functional groups by HCl treatment

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

doi:10.1016/j.biortech.2019.121859

Cited by 165 publications

(66 citation statements)

References 27 publications

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“…The results show that BSL-BC is an effective adsorbent for two heavy metals. Compared with other biochar, BSL-BC exhibited superior maximum adsorption capacity especially for Pb 2+ (302.2 mg/g), which was higher than the camellia seed husk biochar (109.7 mg/g) 47 , peanut shell biochar (52.80 mg/g) 20 , and wheat straw biochar (100.00 mg/g) 36 . Meanwhile, the maximum adsorption capacity of Cd 2+ by BSL-BC (32.03 mg/g) was also higher than the rice husk biochar (9.670 mg/g) 31 and the wheat straw biochar (19.72 mg/g) 36 , yet lower than the dairy manure biochar (51.40 mg/g) 48 .…”

Section: Resultsmentioning

confidence: 92%

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: 92%

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 carboxyl O-H and phenolic O-H of SBB and RSB decreased after Cd adsorption. Besides, the Cd 2+ coordination with π-bonds such as -CH and C=C was also the reason for Cd 2 + adsorption on biochars (Wu, et al 2019). The peak of 1450cm -1 was related to aliphatic C-H and the one of 1350cm -1 was possibly attributed to methyl C-H (R-O-CH3) (Drosos, et al 2009;Drosos, et al 2014;Sui, et al 2020).…”

Section: Discussionmentioning

confidence: 96%

Different Response to Cd2+ Adsorption by Alkali-modified Biochars Derived From Soybean Straw and Rape Straw

Kang

Zhou

et al. 2021

Preprint

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Biochars have been modified by alkali (Ca(OH)2) to enhance Cd sorption capacity in aqueous solution. In this research, the alkali-modified (Ca) biochars were prepared by co-pyrolyzing lime (Ca(OH)2) and soybean straw (SBB) or rape straw (RSB) at 450 °C. The absorption mechanism was investigated by a series of experiments and was provided by quantitative analysis. The maximum adsorption capacities of Cd2+ by Ca-SBB and Ca-RSB were calculated to be 78.49 mg g−1 and 49.96 mg g−1, which were 1.56 and 1.48 times higher than SBB (50.40 mg g−1) and RSB (33.79 mg g−1), respectively. Compared with the original biochar (SBB, RSB), alkali-modified biochars (Ca-SBB and Ca-RSB) were found to have faster adsorption kinetics and lower desorption efficiencies. The mechanism study indicated that Ca(OH)2 modification effectively enhanced the contribution of ion exchange and decreased the contribution of functional groups complexation. After Ca(OH)2 modification, precipitation and ion exchange mechanisms dominated Cd2 + absorption on Ca-SBB, accounting for 49.85% and 34.94% of the total adsorption, respectively. Similarily ion exchange and precipitation were the main adsorption mechanism on Ca-RSB, accounting however for 61.91% and 18.47% of total adsorption, respectively. These results suggested that alkali-modified biochars have great potential in adsorbing cadmium in wastewater.

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“…The FTIR analysis suggested that a large number of hydroxyl and carboxyl oxygen-containing groups were present on the surface of ALBH biochar. Those oxygen functional groups on the biochar could provide the interaction sites for the metal ions (Wu et al 2019).…”

Section: The Effect Of Feedstock Species On the Biochar Characterizationmentioning

confidence: 99%

Carbon nanospheres derived from crop residues by acidic lithium bromide hydrate treatment

Chen

Pang

et al. 2021

BioRes

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Exploring an efficient technique for carbon sphere preparation has attracted extensive attention. Herein, acidic lithium bromide hydrate (ALBH) was used in the hydrothermal carbonization (HTC) process to overcome the recalcitrance of lignocellulose, such that nano-carbon spheres were prepared at mild condition: 140 °C for 150 min with 0.8 M of HCl from 20-40 meshed corn stover. That carbon spheres showed decent morphology properties and abundant functional groups, which was better than that from pine and poplar wood. The corn stover derived carbon nanospheres could efficiently adsorb both heavy ions and methyl orange in wastewater. Meanwhile, the ALBH after reaction could be recovered and reused. Specifically, the morphologies and adsorption capability of the prepared carbon nanospheres using recovered ALBH were negligibly affected even after 5 cycles. These results verified the practical production of carbon nanospheres from lignocellulose at mild conditions, which provided more potential for the synthesis of novel biomass-based materials for comprehensive applications.

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The distribution of Pb(II)/Cd(II) adsorption mechanisms on biochars from aqueous solution: Considering the increased oxygen functional groups by HCl treatment

Cited by 165 publications

References 27 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

Different Response to Cd2+ Adsorption by Alkali-modified Biochars Derived From Soybean Straw and Rape Straw

Carbon nanospheres derived from crop residues by acidic lithium bromide hydrate treatment

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