Urea/ZnCl2 in situ hydrothermal carbonization of Camellia sinensis waste to prepare N-doped biochar for heavy metal removal

Guo, Shasha; Gao, Yuefang; Wang, Yancheng; Liu, Zhengjun; Wei, Xingneng; Peng, Pai; Xiao, Bin; Yang, Yajun

doi:10.1007/s11356-019-06194-8

Cited by 72 publications

(12 citation statements)

References 39 publications

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“…Also, Cr(VI) exists as oxyanion (CrO 4 2− , Cr 2 O 7 2− , HCrO 4 − ) in solutions of high as well as low pH. Hence, a low solution pH is favorable for its adsorption (Guo et al 2019;Chu et al 2020).…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

Kasera

Kolar

Hall

2022

Biochar

126

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Mitigation of toxic contaminants from wastewater is crucial to the safety and sustainability of the aquatic ecosystem and human health. There is a pressing need to find economical and efficient technologies for municipal, agricultural, aquacultural, and industrial wastewater treatment. Nitrogen-doped biochar, which is synthesized from waste biomass, is shown to exhibit good adsorptive performance towards harmful aqueous contaminants, including heavy metals and organic chemicals. Incorporating nitrogen into the biochar matrix changes the overall electronic structure of biochar, which favors the interaction of N-doped biochar with contaminants. In this review, we start the discussion with the preparation techniques and raw materials used for the production of N-doped biochar, along with its structural attributes. Next, the adsorption of heavy metals and organic pollutants on N-doped biochars is systematically discussed. The adsorption mechanisms of contaminant removal by N-doped biochar are also clearly explained. Further, mathematical analyses of adsorption, crucial to the quantification of adsorption, process design, and understanding of the mechanics of the process, are reviewed. Furthermore, the influence of environmental parameters on the adsorption process and the reusability of N-doped biochars are critically evaluated. Finally, future research trends for the design and development of application-specific preparation of N-doped biochars for wastewater treatment are suggested. Graphical abstract

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Section: Effect Of Solution Phmentioning

confidence: 99%

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

Kasera

Kolar

Hall

2022

Biochar

126

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“…Thus, waste and inferior tea leaves (WIT) can be considered as raw materials for TB production through microbial fermentation. Tea-producing nations, notably China, Malaysia, and India, contribute to an annual production exceeding 3 million tons of WIT, encompassing waste tea leaves from tea plant pruning, rejected tea from factories, and tea factory waste. , Additionally, WIT also includes unmarketable tea backlogged in warehouses and the lower-grade tea leaves harvested in the summer or autumn seasons. Notably, the massive accumulation of WIT is difficult to bring economic benefits and may lead to severe environmental issues; therefore, it represents an environmentally friendly and economically viable strategy to produce a low-cost photothermal material from WIT.…”

Section: Introductionmentioning

confidence: 99%

Waste Tea-Derived Theabrownins for Solar-Driven Steam Generation

Li,

Bai,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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Solar-driven seawater desalination has been considered an effective and sustainable solution to mitigate the global freshwater crisis. However, the substantial cost associated with photothermal materials for evaporator fabrication still hinders largescale manufacturing for practical applications. Herein, we successfully obtained high yields of theabrownins (TB), which were oxidation polymerization products of polyphenols from waste and inferior tea leaves using a liquid-state fermentation strategy. Subsequently, a series of photothermal complexes were prepared based on the metal-phenolic networks assembled from TB and metal ions (Fe(III), Cu(II), Ni(II), and Zn(II)). Also, the screened TB@Fe(III) complexes were directly coated on a hydrophilic poly(vinylidene fluoride) (PVDF) membrane to construct the solar evaporation device (TB@Fe(III)@PVDF), which not only demonstrated superior light absorption property and notable hydrophilicity but also achieved a high water evaporation rate of 1.59 kg m −2 h −1 and a steam generation efficiency of 90% under 1 sun irradiation. More importantly, its long-term stability and exceptionally low production cost enabled an important step toward the possibility of large-scale practical applications. We believe that this study holds the potential to pave the way for the development of sustainable and cost-effective photothermal materials, offering new avenues for utilization of agriculture resource waste and solar-driven water remediation.

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“…However, for the pyrolysis of N-lean biomass, different nitrogenous chemicals (e.g., ammonia, ammonium salts, urea, and melamine) serve as the essential external nitrogen sources, which inevitably involve energy- and chemical-intensive processes with harsh conditions and extra cost. − On the contrary, N-rich biomass could be used as the precursor to directly fabricate N-doped biochar via pyrolysis without any external nitrogen sources due to the inherent nitrogen of protein in its chemical composition. A low nitrogen content (usually <6 wt %) is often obtained in the N-doped biochar pyrolyzed from N-rich biomass owing to the volatilization of the organic composition at the high pyrolysis temperature. − Therefore, a facile and judicious design of N-rich biochar with desirable porous structures and surface chemical functionality should be developed for the effective removal of diverse contaminants from complicated wastewater.…”

Section: Introductionmentioning

confidence: 99%

Engineering Magnetic Biochar from Polyphenol-Functionalized Biomass for the Removal of Broad-Spectrum Water Contaminants

Tang,

Wang,

Gou

et al. 2024

ACS Sustainable Resour. Manage.

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Various water contaminants raise concerns about potential negative effects on aquatic ecosystems and human health, which demand breakthrough technologies for the effective removal of a wide range of water contaminants. Recently, nitrogen-doped biochar has shown promise in the removal of various contaminants due to its merits of having a high surface area, versatile surface functionality, and variable surface charge. However, obtaining nitrogen-doped biochar with a high nitrogen content and large surface area simultaneously is challenging. Herein, we developed a nitrogen-rich magnetic and porous biochar (NMPC) via facile pyrolysis of polyphenol and metal ions cofunctionalized collagen. Benefiting from a large surface area (1194.4 m 2 g −1 ) and a high nitrogen content (8.35 wt %), NMPC exhibited high adsorption performance for broad-spectrum water contaminants, including dyes, antibiotics, and heavy metal ions. Besides, NMPC could be magnetically separated for easy recycling with the embedded magnetic iron carbide (Fe 3 C) and still maintained a high removal performance even in a six-cycle test. This work provides new possibilities for the fabrication of nitrogen-rich magnetic biochar which holds great potential in efficient removal of broad-spectrum water contaminants.

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Urea/ZnCl2 in situ hydrothermal carbonization of Camellia sinensis waste to prepare N-doped biochar for heavy metal removal

Cited by 72 publications

References 39 publications

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

Nitrogen-doped biochars as adsorbents for mitigation of heavy metals and organics from water: a review

Waste Tea-Derived Theabrownins for Solar-Driven Steam Generation

Engineering Magnetic Biochar from Polyphenol-Functionalized Biomass for the Removal of Broad-Spectrum Water Contaminants

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