Synthesis and applications of bismuth-impregnated biochars originated from spent coffee grounds for efficient adsorption of radioactive iodine: A mechanism study

Kwak, Jinwoo; Lee, Sang-Ho; Shin, Jaegwan; Lee, Yong-Gu; Kim, Sangwon; Son, Changgil; Ren, Xianghao; Shin, Jae-Ki; Park, Yongeun; Chon, Kangmin

doi:10.1016/j.envpol.2022.120138

Cited by 12 publications

(2 citation statements)

References 57 publications

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“…Recently, the most promising materials for iodine remediation from nuclear waste include metal oxides (Muhire et al, 2022), bentonite (Yang et al, 2022) and zeolites (Zhang et al, 2022), bismuth-based mineral phases (Levitskaia et al, 2022), silica aerogel (Chang et al, 2022), organopolymeric structures (Kusumkar et al, 2021;Mohan et al, 2022) and various biomass-based sorbents, such as Bi-impregnated spent coffee ground biochar (Kwak et al, 2022). The application of microorganisms was also proposed (Shin et al, 2022).…”

Section: Open Access Edited Bymentioning

confidence: 99%

Microbial involvement in iodine cycle: mechanisms and potential applications

Duborská,

Vojtková,

Matulová

et al. 2023

Front. Bioeng. Biotechnol.

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Stable iodine isotopes are essential for humans as they are necessary for producing thyroid gland hormones. However, there are hazardous radioactive iodine isotopes that are emitted into the environment through radioactive waste generated by nuclear power plants, nuclear weapon tests, and medical practice. Due to the biophilic character of iodine radionuclides and their enormous biomagnification potential, their elimination from contaminated environments is essential to prevent the spread of radioactive pollution in ecosystems. Since microorganisms play a vital role in controlling iodine cycling and fate in the environment, they also can be efficiently utilized in solving the issue of contamination spread. Thus, this paper summarizes all known on microbial processes that are involved in iodine transformation to highlight their prospects in remediation of the sites contaminated with radioactive iodine isotopes.

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Section: Open Access Edited Bymentioning

confidence: 99%

Microbial involvement in iodine cycle: mechanisms and potential applications

Duborská,

Vojtková,

Matulová

et al. 2023

Front. Bioeng. Biotechnol.

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“…Studies investigating the use of biochar produced from coffee grounds for anion removal are limited [10]. Kwak et al [53] conducted a study on the adsorption of radioactive iodine using biochar derived from coffee grounds, achieving a favorable removal of 22.73 µg•g −1 at equilibrium. In another study, where biochar was impregnated with magnesium for subsequent phosphorus removal, the authors achieved a 24ch removal of 89.4%, equivalent to an adsorption capacity of 14 mg•g −1 [48].…”

Section: Introductionmentioning

confidence: 99%

Fluoride Removal from Aqueous Medium Using Biochar Produced from Coffee Ground

et al. 2023

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Low concentrations of fluoride (F−) in drinking water are beneficial for oral health, but the natural occurrence of high F- content has been reported in various groundwater sources, posing a continuous ingestion threat to humans. The utilization of biochar (BC) produced from residual biomass has emerged as a technically, economically, and environmentally sustainable alternative for fluoride removal through adsorption. Therefore, this study aimed to investigate the physicochemical characteristics of BC derived from coffee grounds and the influence of various factors on the adsorption process of F- in aqueous media, including pH, adsorbent dosage, contact time, temperature, and initial F- concentration. The BC exhibited a surface area of 12.94 m2·g−1 and a pore volume of 0.0349 cm3·g−1. The adsorption process was strongly pH dependent, demonstrating a significant decline in performance as pH increased from 2.0 onwards. The majority of F- removal occurred within the first 5 min, reaching adsorption equilibrium after 1 h of testing, regardless of the initial F- concentration employed. The data fitting to the Webber–Morris model indicated a two-step adsorption process on BC, with the first step being external surface sorption and the second step being intra-articular diffusion. The process was determined to be endergonic, and the data satisfactorily matched both the Freundlich and Langmuir models, with a qm of 0.53 mg·L−1 (T = 55 °C), indicating the predominance of physisorption. The findings suggest the potential of coffee grounds for BC production; nevertheless, surface structure modifications are necessary to enhance F− affinity and subsequently improve adsorption capacity.

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