Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe3O4@SiO2-NH2 particles

Shi, Shunquan; Yang, Jiakuan; Liang, Sha; Li, Mingyang; Gan, Quan; Xiao, Keke; Hu, Jingping

doi:10.1016/j.scitotenv.2018.02.091

Cited by 275 publications

(75 citation statements)

References 65 publications

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“…41 Besides, there is a similar peak at around 28 in the XRD patterns of both the CS and CS-CNT samples; the sharp peak represents the formation of turbostratic graphite crystallites. 42,43 3.2 Effects of different conditions on Pb(II) removal…”

Section: Resultsmentioning

confidence: 99%

The effects of different factors on the removal mechanism of Pb(ii) by biochar-supported carbon nanotube composites

Yang

Sun

et al. 2020

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

The effects of different factors on the removal mechanism of Pb(ii) by biochar-supported carbon nanotube composites

Yang

Sun

et al. 2020

RSC Adv.

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“…Currently, the main methods include chemical modification of the surface, co-pyrolysis, and catalytic esterification [15][16][17]. Previous studies have shown that the type of modifier, as well as the modification method can affect the quality of the modified biochar [18][19][20]. Ma et al synthesized modified biochar rich in -NH 2 by cross-linking using polyethyleneimine as the modifier, and the maximum adsorption capacity of the modified biochar to Cr 6+ was 435 mg/g, much higher than the 23.09 mg/g before modification [21].…”

Section: Introductionmentioning

confidence: 99%

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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“…Therefore, researchers at home and abroad have studied the adsorption performance and mechanisms of biochar. For example, biochar modified with Fe 3 O 4 @SiO 2 -NH 2 particles had a maximum adsorption capacity for hexavalent chromium ions of 27.20 mg/g, and its adsorption mechanism was composed of three steps for Cr(VI) on magnetic biochar [17]. A sulfuric acid pretreatment was applied, and then a MgO-coated biochar was used to prepare composite materials, which significantly improved the capacity for the adsorption of Cr(VI).…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

Deng

Jiang

et al. 2020

Materials

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Biochars were produced with magnesium chloride as an additive for the sorption of hexavalent chromium dissolved in water using five types of straw (from taro, corn, cassava, Chinese fir, and banana) and one type of shell (Camellia oleifera) as the raw materials. The removal of hexavalent chromium by the six biochars mainly occurred within 60 min and then gradually stabilized. The kinetics of the adsorption process were second order, the Langmuir model was followed, and the adsorption of Cr(VI) by the six biochars was characterized by Langmuir monolayer chemisorption on a heterogeneous surface. Banana straw biochar (BSB) had the best performance, which perhaps benefitted from its special structure and best adsorption effect on Cr(VI), and the theoretical adsorption capacity was calculated as 125.00 mg/g. For the mechanism analysis, Mg-loaded biochars were characterized before and after adsorption by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), and scanning electron microscopy/energy dispersive spectroscopy (SEM-EDS). The adsorption mechanism differed from the adsorption process of conventional magnetic biochar, and biochar interactions with Cr(VI) were controlled mainly by electrostatic attraction, complexation, and functional group bonding. In summary, the six Mg-loaded biochars exhibit great potential advantages in removing Cr(VI) from wastewater and have promising potential for practical use, especially BSB, which shows super-high adsorption performance.

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Enhanced Cr(VI) removal from acidic solutions using biochar modified by Fe3O4@SiO2-NH2 particles

Cited by 275 publications

References 65 publications

The effects of different factors on the removal mechanism of Pb(ii) by biochar-supported carbon nanotube composites

The effects of different factors on the removal mechanism of Pb(ii) by biochar-supported carbon nanotube composites

Removal of Aquatic Cadmium Ions Using Thiourea Modified Poplar Biochar

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

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