Biochar synthesized via pyrolysis of Broussonetia papyrifera leaves: mechanisms and potential applications for phosphate removal

Qiu, Guoqiang; Zhao, Yunlin; Wang, Hui; Tan, Xiaofei; Chen, Fangxu; Hu, Xinjiang

doi:10.1007/s11356-018-04095-w

Cited by 21 publications

(17 citation statements)

References 46 publications

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“…In our previous study, the XRD patterns of the g-C 3 N 4 showed two characteristic peaks at 13.0 and 27.4 , corresponding to reections from the (100) and (102) crystal planes of g-C 3 N 4 (JCPDS 87-1526), respectively. 32,33 XRD analysis ( Fig. 2a) showed that the pattern of SAC featured two characteristic peaks that are same as that of g-C 3 N 4 .…”

Section: Photoelectrochemical Measurementsmentioning

confidence: 87%

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Three-dimensional microspheric g-C₃N₄coupled byBroussonetia papyriferabiochar: facile sodium alginate immobilization and excellent photocatalytic Cr(iv) reduction

Xie

Cai

et al. 2020

RSC Adv.

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Section: Photoelectrochemical Measurementsmentioning

confidence: 87%

“…C1s of SABC-3 in Fig. 3a can be deconvoluted into 6 peaks, at 284.61, 284.81, 285.30, 286.72, 288.21, and 289.00 eV, belonging to C-N, C-C, C-O, C-O-C, N-C]N and O-C]O units, respectively 32,33. The N1s spectrum shown inFig.…”

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confidence: 93%

Three-dimensional microspheric g-C₃N₄coupled byBroussonetia papyriferabiochar: facile sodium alginate immobilization and excellent photocatalytic Cr(iv) reduction

Xie

Cai

et al. 2020

RSC Adv.

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“…According to the adsorption envelope phenomenon for anions, the Fe-loaded biochar surface becomes more protonated and positively charged with a decreasing pH, causing increased phosphate adsorption by electrostatic attraction. The phosphate adsorption is expected to decrease with an increasing pH due to the increased negatively charged surface, resulting in the electrostatic repulsion of phosphate [49]. Note that this study did not measure the point of zero charge (PZC).…”

Section: Intial Ph Effect On Phosphate Adsorptionmentioning

confidence: 98%

“…However, this was not the case for the Mg-loaded AB in the current study. The precipitation of phosphate associated with Mg(OH)2 was likely to occur with an increasing pH, resulting in increased phosphate adsorption (will be discussed more in the next section) [49].…”

Section: Intial Ph Effect On Phosphate Adsorptionmentioning

confidence: 99%

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

et al. 2022

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There has been increasing interest in using biochar for nutrient removal from water, and its application for anionic nutrient removal such as in phosphate (PO43−) necessitates surface modifications of raw biochar. This study produced avocado seed biochar (AB), impregnated Fe- or Mg-(hydr)oxide onto biochar (post-pyrolysis), and tested their performance for aqueous phosphate removal. The Fe- or Mg-loaded biochar was prepared in either high (1:8 of biochar to metal salt in terms of mass ratio) or low (1:2) loading rates via the co-precipitation method. A total of 5 biochar materials (unmodified AB, AB + High Fe, AB + Low Fe, AB + High Mg, and AB + Low Mg) were characterized according to their selected physicochemical properties, and their phosphate adsorption performance was tested through pH effect and adsorption isotherm experiments. Fe-loaded AB contained Fe3O4, while Mg-loaded AB contained Mg(OH)2. The metal (hydr)oxide inclusion was higher in Fe-loaded AB. Mg-loaded AB showed a unique free O–H functional group, while Fe-loaded AB showed an increase in its specific surface area more than 10-times compared to unmodified AB (1.8 m2 g−1). The effect of the initial pH on phosphate adsorption was not consistent between Fe-(anion adsorption envelope) vs. Mg-loaded AB. The phosphate adsorption capacity was higher with Fe-loaded AB in low concentration ranges (≤50 mg L−1), while Mg-loaded AB outperformed Fe-loaded AB in high concentration ranges (75–500 mg L−1). The phosphate adsorption isotherm by Fe-loaded AB fit well with the Langmuir model (R2 = 0.91–0.96), indicating the adsorptive surfaces were relatively homogeneous. Mg-loaded biochar, however, fit much better with Freundlich model (R2 = 0.94–0.96), indicating the presence of heterogenous adsorptive surfaces. No substantial benefit of high loading rates in metal impregnation was found for phosphate adsorption. The enhanced phosphate removal by Mg-loaded biochar in high concentration ranges highlights the important role of the chemical precipitation of phosphate associated with dissolved Mg2+.

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“…The slow desorption of the BC-sequestered nutrient elements may supply a steady rate of nutrient delivery, thereby alleviating the need for excessive fertilizer use. Together, these agronomic benefits to soil health may also mitigate freshwater eutrophication that results from fertilizer runoff, prevent pesticide contamination, and reduce the risk of environmental damage [85][86][87].…”

Section: Soil Tilth and Nutrient Statusmentioning

confidence: 99%

Biochar—A Panacea for Agriculture or Just Carbon?

2020

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The sustainable production of food faces formidable challenges. Foremost is the availability of arable soils, which have been ravaged by the overuse of fertilizers and detrimental soil management techniques. The maintenance of soil quality and reclamation of marginal soils are urgent priorities. The use of biochar, a carbon-rich, porous material thought to improve various soil properties, is gaining interest. Biochar (BC) is produced through the thermochemical decomposition of organic matter in a process known as pyrolysis. Importantly, the source of organic material, or ‘feedstock’, used in this process and different parameters of pyrolysis determine the chemical and physical properties of biochar. The incorporation of BC impacts soil–water relations and soil health, and it has been shown to have an overall positive impact on crop yield; however, pre-existing physical, chemical, and biological soil properties influence the outcome. The effects of long-term field application of BC and how it influences the soil microcosm also need to be understood. This literature review, including a focused meta-analysis, summarizes the key outcomes of BC studies and identifies critical research areas for future investigations. This knowledge will facilitate the predictable enhancement of crop productivity and meaningful carbon sequestration.

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Biochar synthesized via pyrolysis of Broussonetia papyrifera leaves: mechanisms and potential applications for phosphate removal

Cited by 21 publications

References 46 publications

Three-dimensional microspheric g-C₃N₄coupled byBroussonetia papyriferabiochar: facile sodium alginate immobilization and excellent photocatalytic Cr(iv) reduction

Three-dimensional microspheric g-C₃N₄coupled byBroussonetia papyriferabiochar: facile sodium alginate immobilization and excellent photocatalytic Cr(iv) reduction

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

Biochar—A Panacea for Agriculture or Just Carbon?

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Biochar synthesized via pyrolysis of Broussonetia papyrifera leaves: mechanisms and potential applications for phosphate removal

Cited by 21 publications

References 46 publications

Three-dimensional microspheric g-C3N4coupled byBroussonetia papyriferabiochar: facile sodium alginate immobilization and excellent photocatalytic Cr(iv) reduction

Three-dimensional microspheric g-C3N4coupled byBroussonetia papyriferabiochar: facile sodium alginate immobilization and excellent photocatalytic Cr(iv) reduction

Iron and Magnesium Impregnation of Avocado Seed Biochar for Aqueous Phosphate Removal

Biochar—A Panacea for Agriculture or Just Carbon?

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Product

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Three-dimensional microspheric g-C₃N₄coupled byBroussonetia papyriferabiochar: facile sodium alginate immobilization and excellent photocatalytic Cr(iv) reduction

Three-dimensional microspheric g-C₃N₄coupled byBroussonetia papyriferabiochar: facile sodium alginate immobilization and excellent photocatalytic Cr(iv) reduction