Effect of Ginkgo biloba leaves on the removal efficiency of Cr(VI) in soil and its underlying mechanism

Xu, Hefeng; Fan, Yanling; Xia, Xu; Liu, Zengjun; Yang, Shuo

doi:10.1016/j.envres.2022.114431

Cited by 8 publications

(2 citation statements)

References 41 publications

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“…Conversely, when the pH was higher than 6 (particularly 8), the protonation of the dye was gradually weakened, and the biochars with negative active sites on the surface were not conducive to the adsorption of anionic dyes due to electrostatic repulsion, which reduced the adsorption amount of MO. Cr 6+ also possessed various forms at different pH levels [ 4 , 5 , 20 ], where it exists as HCrO 4 − and Cr 2 O 7 2− when the pH is lower than 6.5, and as Cr 2 O 7 2− and CrO 4 2− when the pH is higher than 6.5. With the increase in pH, the adsorption capacities of both BBB and N-BBB decreased, and the maximum adsorption capacities were at a pH value of 2.…”

Section: Resultsmentioning

confidence: 99%

“…Cr 6+ is one of the main forms of Cr. Because of its high solubility, easy accumulation, and difficulty degrading in the ecosystem, Cr 6+ is one of the main toxic heavy metals that pollute water bodies [ 4 ]. Cr 6+ ions are discharged into the water in large quantities during industrial processes such as metallurgy and electroplating [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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One-Step Synthesis of Nitrogen-Doped Porous Biochar Based on N-Doping Co-Activation Method and Its Application in Water Pollutants Control

Shi

Jiang

et al. 2022

IJMS

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In this work, birch bark (BB) was used for the first time to prepare porous biochars via different one-step methods including direct activation (BBB) and N-doping co-activation (N-BBB). The specific surface area and total pore volume of BBB and N-BBB were 2502.3 and 2292.7 m2/g, and 1.1389 and 1.0356 cm3/g, respectively. When removing synthetic methyl orange (MO) dye and heavy metal Cr6+, both BBB and N-BBB showed excellent treatment ability. The maximum adsorption capacities of BBB and N-BBB were 836.9 and 858.3 mg/g for MO, and 141.1 and 169.1 mg/g for Cr6+, respectively, which were higher than most previously reported biochar adsorbents. The probable adsorption mechanisms, including pore filling, π–π interaction, H-bond interaction, and electrostatic attraction, supported the biochars’ demonstrated high performance. In addition, after five recycles, the removal rates remained above 80%, which showed the high stability of the biochars. This work verified the feasibility of the one-step N-doping co-activation method to prepare high-performance biochars, and two kinds of biochars with excellent performance (BBB and N-BBB) were prepared. More importantly, this method provides new directions and ideas for the development and utilization of other biomasses.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%