Walnut shell biochar based sorptive remediation of estrogens polluted simulated wastewater: Characterization, adsorption mechanism and degradation by persistent free radicals

Xu, Hang; Wang, Guangzhou; Deng, Peiyuan; Li, Feng

doi:10.1016/j.eti.2022.102870

Cited by 24 publications

(12 citation statements)

References 54 publications

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“…108 The maximum adsorption efficiency (∼98%) observed by 108 is comparable to the one (99%) reported for EE2 by 109 using mesoporous carbons and another one (99%) reported by Tagliavini et al 110 for the adsorption of E2 in cellulose ultrafiltration membrane setup coupled with polymer-based spherical AC produced by carbonization and steam activation of cross-linked polystyrene. However, the efficiency is higher than the one (50%) reported by 111 using walnut shell BC and the one (<95%) reported by 112,113 using cellulose nanofiltration and ultrafiltration membranes setup coupled with polymer-based spherical AC.…”

Section: Adsorption Technique For the Removal Of Ses In Watercontrasting

confidence: 60%

“…To sequestrate these SEs in water, the conventional water treatment system cannot cater for their removal 2,20 because many of the chemicals have not been included in the wastewater treatment legislation (Directive 2000/60/EC, Directive 2008/56/ EC, and Directive 2013/39/EU), 27,28 making researchers explore other types of treatment technologies that have been developed. Different types of treatment technologies have been developed, such as advanced oxidation processes, 15 chlorination, 29 coagulation-occulation, 30 electrocatalysis, 31 photocatalysis, 2,20 adsorption, 11,18,32 membrane technology, 33,34 and reverse osmosis. 35,36 The major shortcomings of these technologies are the high cost of operation and the production of secondary by-products, which may be more toxic and complex.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sequestration of steroidal estrogen in aqueous samples using an adsorption mechanism: a systemic scientometric review

et al. 2023

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Section: Adsorption Technique For the Removal Of Ses In Watercontrasting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Sequestration of steroidal estrogen in aqueous samples using an adsorption mechanism: a systemic scientometric review

et al. 2023

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“…Several recent studies have mainly investigated the possible contribution of BC-bound PFRs in the removal of several organic xenobiotics through oxidative degradation by electron transfer-dependent production of reactive oxygen species (ROS) [ 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 ]. The degradation of hazardous cations, including As (III) and Cr (VI), by PFRs via electron transfer has also been extensively reported [ 84 , 85 , 86 , 87 , 88 ], as well as that of biological samples, including hormones and extracellular DNA (eDNA) [ 89 , 90 , 91 , 92 , 93 ]. Odinga et al reviewed the application of BC-derived PFRs in the remediation of several environmental pollutants [ 94 ], while Fang et al explored the reactivity of PFRs in BC and their catalytic ability to activate persulfate to degrade pollutants [ 95 ].…”

Section: What Can Biochar Do?mentioning

confidence: 99%

Bamboo-Based Biochar: A Still Too Little-Studied Black Gold and Its Current Applications

Alfei,

Pandoli

2024

JoX

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Biochar (BC), also referred to as “black gold”, is a carbon heterogeneous material rich in aromatic systems and minerals, preparable by the thermal decomposition of vegetable and animal biomasses in controlled conditions and with clean technology. Due to its adsorption ability and presence of persistent free radicals (PFRs), BC has demonstrated, among other uses, great potential in the removal of environmental organic and inorganic xenobiotics. Bamboo is an evergreen perennial flowering plant characterized by a short five-year growth period, fast harvesting, and large production in many tropical and subtropical countries worldwide, thus representing an attractive, low-cost, eco-friendly, and renewable bioresource for producing BC. Due to their large surface area and increased porosity, the pyrolyzed derivatives of bamboo, including bamboo biochar (BBC) or activated BBC (ABBC), are considered great bio-adsorbent materials for removing heavy metals, as well as organic and inorganic contaminants from wastewater and soil, thus improving plant growth and production yield. Nowadays, the increasing technological applications of BBC and ABBC also include their employment as energy sources, to catalyze chemical reactions, to develop thermoelectrical devices, as 3D solar vapor-generation devices for water desalination, and as efficient photothermal-conversion devices. Anyway, although it has great potential as an alternative biomass to wood to produce BC, thus paving the way for new bio- and circular economy solutions, the study of bamboo-derived biomasses is still in its infancy. In this context, the main scope of this review was to support an increasing production of BBC and ABBC and to stimulate further studies about their possible applications, thus enlarging the current knowledge about these materials and allowing their more rational, safer, and optimized application. To this end, after having provided background concerning BC, its production methods, and its main applications, we have reviewed and discussed the main studies on BBC and ABBC and their applications reported in recent years.

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“…As pH increased, the removal rate of estrogens decreased slightly, indicating that the strong interaction, hydrophobic interaction and weak hydrogen bonding between estrogens and nZVI-biochar were responsible for the high removal performance. Besides, Xu et al reported that the oxygen-centered PFRs formed during preparation led to the degradation of estrogens (Xu et al 2022b). Thereby, the degradation products of estrogens by nZVI-biochar were analyzed by GC-MS.…”

Section: Adsorption Mechanism Of Estrogensmentioning

confidence: 99%

Enhanced removal of estrogens from simulated wastewater by biochar supported nanoscale zero-valent iron: performance and mechanism

Han,

Xu,

Wang

et al. 2023

Biochar

Self Cite

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The intensification of estrogen non-point source pollution has drawn global attention due to their contribution to ecological environment problems worldwide, and it is critical to develop effective, economic and eco-friendly methods for reducing estrogens pollution. To address the agglomeration and oxidation of nano zero-valent iron (nZVI), biochar-nanoscale zero-valent iron composite (nZVI-biochar) could be a feasible choice for estrogens removal. This study summarized biochar and nZVI-biochar preparation, characterization, and unusual applications for estrone (E1), 17β-estradiol (E2), and estriol (E3) removal. The properties of biochar and nZVI-biochar in characterization, effects of influencing factors on the removal efficiency, adsorption kinetics, isotherm and thermodynamics were investigated. The experiment results showed that nZVI-biochar exhibited the superior removal performance for estrogens pollutants compared to biochar. Based on the quasi-second-order model, estrogens adsorption kinetics were observed, which supported the mechanism that chemical and physical adsorption existed simultaneously on estrogens removal. The adsorption isotherm of estrogens could be well presented by the Freundlich model and thermodynamics studies explained that nZVI-biochar could spontaneously remove estrogens pollutants and the main mechanisms involved π-π interaction, hydrophobic interaction, hydrogen bonding and degradation through ring rupture. The products analyzed by GC–MS showed that estrogens degradation was primarily attributed to the benzene ring broken, and Fe3+ promoted the production of free radicals, which further proved that nZVI-biochar had the excellent adsorption performances. Generally, nZVI-biochar could be employed as a potential material for removing estrogens from wastewater. Graphical Abstract

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Walnut shell biochar based sorptive remediation of estrogens polluted simulated wastewater: Characterization, adsorption mechanism and degradation by persistent free radicals

Cited by 24 publications

References 54 publications

Sequestration of steroidal estrogen in aqueous samples using an adsorption mechanism: a systemic scientometric review

Sequestration of steroidal estrogen in aqueous samples using an adsorption mechanism: a systemic scientometric review

Bamboo-Based Biochar: A Still Too Little-Studied Black Gold and Its Current Applications

Enhanced removal of estrogens from simulated wastewater by biochar supported nanoscale zero-valent iron: performance and mechanism

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