Implications of layered double hydroxides assembled biochar composite in adsorptive removal of contaminants: Current status and future perspectives

Vithanage, Meththika; Ashiq, Ahmed; Ramanayaka, Sammani; Bhatnagar, Amit

doi:10.1016/j.scitotenv.2020.139718

Cited by 66 publications

(15 citation statements)

References 58 publications

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“…The production of BC is also a sustainable solution for waste management [136,137] since it sequesters CO 2 [138], reintroduces important elements into the environment [139,140], replaces highly polluting materials and allows contributing to the circular economy [141][142][143]. Recently, the application of BC as an adsorbent media has been suggested for the removal of several contaminants [144,145], both inorganic (metals, salts) and organic (insecticides, herbicides, antibiotics) [146][147][148], also including the emerging ones [149].…”

Section: Biocharmentioning

confidence: 99%

A Review on the Removal of Carbamazepine from Aqueous Solution by Using Activated Carbon and Biochar

et al. 2021

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Carbamazepine (CBZ), one of the most used pharmaceuticals worldwide and a Contaminant of Emerging Concern, represents a potential risk for the environment and human health. Wastewater treatment plants (WWTPs) are a significant source of CBZ to the environment, polluting the whole water cycle. In this review, the CBZ presence and fate in the urban water cycle are addressed, with a focus on adsorption as a possible solution for its removal. Specifically, the scientific literature on CBZ removal by activated carbon and its possible substitute Biochar, is comprehensively scanned and summed up, in view of increasing the circularity in water treatments. CBZ adsorption onto activated carbon and biochar is analyzed considering several aspects, such as physicochemical characteristics of the adsorbents, operational conditions of the adsorption processes and adsorption kinetics and isotherms models. WWTPs usually show almost no removal of CBZ (even negative), whereas removal is witnessed in drinking water treatment plants through advanced treatments (even >90%). Among these, adsorption is considered one of the preferable methods, being economical and easier to operate. Adsorption capacity of CBZ is influenced by the characteristics of the adsorbent precursors, pyrolysis temperature and modification or activation processes. Among operational conditions, pH shows low influence on the process, as CBZ has no charge in most pH ranges. Differently, increasing temperature and rotational speed favor the adsorption of CBZ. The presence of other micro-contaminants and organic matter decreases the CBZ adsorption due to competition effects. These results, however, concern mainly laboratory-scale studies, hence, full-scale investigations are recommended to take into account the complexity of the real conditions.

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Section: Biocharmentioning

confidence: 99%

A Review on the Removal of Carbamazepine from Aqueous Solution by Using Activated Carbon and Biochar

et al. 2021

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“…Its application in water treatment as an adsorbent has excellent potential due to its low cost, exchangeable anionic features, and large surface area (Bouteraa et al, 2020;Zubair et al, 2021). According to Vithanage et al (2020) , LDH is adsorbent in water treatment applications to remove organic, inorganic species, dyestu s, and toxic metal contaminants. Rathee et al (2019) reported that LDH, which was applied as an adsorbent, had limitations in the regeneration process.…”

Section: Introductionmentioning

confidence: 99%

Hydrochar and Humic Acid as Template of ZnAl Layered Double Hydroxide for Adsorption of Phenol

Badaruddin

Ahmad

Fitri

et al. 2022

Sci. Technol. Indones

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The adsorbents potential ZnAl-LDH, ZnAl-Hydrochar, and ZnAl-Humic acid were prepared using the coprecipitation method. The adsorbents were characterization by XRD, FTIR, and BET analysis. XRD peaks of ZnAl-LDH at 10.29°, 20.07°, 29.59°, 32.12°, 34.02°, 48.06°, and 60.16°. The FTIR absorption peak was observed at 3400-3500 cm−1, 1600-1700 cm−1, 1381 cm−1, 1000 cm−1, 500-700 cm−1. All adsorbents exhibited N2 adsorption-desorption isotherms type IV classified as a mesoporous structure (pore size= 2-50 nm). The surface areas of composites were higher than LDH and following order: ZnAl-Hydrochar > ZnAl-Humic acid > ZnAl-LDH. The kinetic parameter showed the pseudo-second-order kinetics model. The maximum adsorption capacity of ZnAl-LDH, ZnAl-Hydrochar, and ZnAl-Humic acid were 48.077 mg/g, 90.090 mg/g, 94.340 mg/g, respectively; with Freundlich isotherm model. Reusability after 5 times of ZnAl-LDH, ZnAl-Hydrochar, and ZnAl-Humic acid in the range 49.81-0.890%, 95.92-9.84%, and 70.02-5.72%, respectively. The adsorbent can be used up to 3 times.

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“…Phosphate anions can provide non-bonding electron pairs, which are easy to bond with electron deficient metal ions through orbital overlap by Lewis basicity (Wu et al, 2020). Using metal oxides to modify biochar is thus expected to enrich the single surface structure of biochar and produce functional biochar materials (Vithanage et al, 2020). To our best knowledge, the adsorption performance and recovery pathway of phosphate recovery from urine using Mg/Fe biochar has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Efficient recovery of phosphate from simulated urine by Mg/Fe bimetallic oxide modified biochar as a potential resource

Liu

Shan

Chen

et al. 2021

Science of The Total Environment

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Implications of layered double hydroxides assembled biochar composite in adsorptive removal of contaminants: Current status and future perspectives

Cited by 66 publications

References 58 publications

A Review on the Removal of Carbamazepine from Aqueous Solution by Using Activated Carbon and Biochar

A Review on the Removal of Carbamazepine from Aqueous Solution by Using Activated Carbon and Biochar

Hydrochar and Humic Acid as Template of ZnAl Layered Double Hydroxide for Adsorption of Phenol

Efficient recovery of phosphate from simulated urine by Mg/Fe bimetallic oxide modified biochar as a potential resource

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