High capacity aqueous phosphate reclamation using Fe/Mg-layered double hydroxide (LDH) dispersed on biochar

Rahman, Sharifur; Navarathna, Chanaka; Das, Naba Krishna; Alchouron, Jacinta; Reneau, Parker; Stokes, Sean; Thirumalai, R.; Pérez, Felio; Hassan, El Barbary; Mohan, Dinesh; Pittman, Charles U.; Mlsna, Todd

doi:10.1016/j.jcis.2021.03.114

Cited by 102 publications

(13 citation statements)

References 60 publications

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“…However, little is known about long‐term biochar adsorption capacity in water treatment systems. In addition, great emphasis has been placed on removing phosphate from wastewater, and a recent study has demonstrated the recovery of adsorbent for repeated use of biochar without significant loss of adsorption capacity (Rahman et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

A data synthesis on the biochar properties and implications for air, soil, and water quality in Brazil

Pôggere

Santana

Barbosa

et al. 2022

Environmental Quality Mgmt

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Biochar has been intensively researched worldwide. In Brazil, there is a variety of feedstock production that can be turned into soil amendments of high performance through biochar conversion, especially solid wastes. However, advances in biochar research in Brazil have not been systematically evaluated to indicate possible gaps and suggest future research for eco-friendly applications. Thus, in this work we evaluated biochar properties and effects on air, water, and soil quality based on data gathered from researches performed in Brazil. Biochar has been mainly evaluated as soil conditioner (37%), material characterization (17%), water treatment (12%), and greenhouse gases emissions (9%). Based on the data synthesis of 68 feedstocks used for biochar production, we observed that the pyrolysis temperature profoundly affects biochar properties. Meta-analysis indicated benefits of biochar addition to soils for chemical, physical, microbiological and biochemical attributes that have resulted in increases in root growth (+30%), and plant shoots (+45%). Pyrolysis temperature and feedstock are key choices to design biochar properties aiming to retain dyes, aromatic hydrocarbon, pesticides, and metals in water and wastewater treatment. It was also observed an increase in CO 2 and a decrease in N 2 O emissions after biochar application to soils in short-term experiments. Although there is a growing interest in the development of electrochemical sensors and biochar-based fertilizers, technological applications of biochar are still incipient in Brazil. Future research should prioritize long-term and mechanistically evaluations of biochar under field conditions and the development of eco-friendly technological applications.

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Section: Discussionmentioning

confidence: 99%

A data synthesis on the biochar properties and implications for air, soil, and water quality in Brazil

Pôggere

Santana

Barbosa

et al. 2022

Environmental Quality Mgmt

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“…On the other hand, pH affected the surface charge of FBC-400. According to the method described in document (Rahman et al, 2021), the pH pzc of FBC-400 was measured to be 7.2. When pH < 7.2, the surface of FBC-400 was positively charged, and electrostatic attraction promotes the adsorption of phosphate.…”

Section: Effect Of Initial Ph On Phosphorus Removalmentioning

confidence: 99%

Removal of phosphorus using biochar derived from Fenton sludge: Mechanism and performance insights

Liu

Wei

et al. 2022

Water Environment Research

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A phosphorus removal biochar adsorbent was prepared from Fenton sludge. The adsorption process was optimized, and its phosphorus adsorption mechanism was discussed. It was found that the phosphorus adsorption performance of biochar prepared from single Fenton sludge (FBC‐400) was better than that of co‐pyrolysis of Fenton sludge and bamboo powder. The optimum condition was that Fenton sludge pyrolyzed at 400°C (FBC‐400). FBC‐400 had a larger specific surface area than that prepared by co‐pyrolysis with bamboo powder. And the high content of iron element could provide a higher surface charge of the biochar, thereby increasing the electrostatic adsorption of phosphorus onto FBC‐400. The phosphorus adsorption was highly pH dependent by FBC‐400, which can enhance electrostatic adsorption and increase adsorption capacity in acidic conditions. The effect of coexisting anion on adsorption performance was mainly affected by CO32−, reducing the adsorption capacity by at least 49%, whereas other anions had no obvious interference. The adsorption process of FBC‐400 accorded with the pseudo‐second‐order kinetic model and the Langmuir model, which indicated that the adsorption process was monolayer adsorption and mainly chemical adsorption, and the maximum saturated phosphorus adsorption capacity was 8.77 mg g−1. The mechanisms for phosphorus adsorption were electrostatic adsorption and inner‐sphere complexing. 1 M NaOH was used for desorption, and the adsorption capacity remained at 81% in the fifth cycle. Practitioner Points The Fenton sludge biochar usage as an adsorbent could be a win‐win strategy to convert waste biomass to valuable ‐ product. The adsorption process accorded with the Langmuir model, the maximum phosphorus adsorption capacity was 8.77 mg/g at 25°C. The adsorption mechanisms were electrostatic adsorption and inner‐sphere complexing. 1M NaOH was used for desorption, and the adsorption capacity remained at 81% in the fifth cycle.

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“…Solutions were then filtered and recovered. CaFe/biochar (CO 2 ) was overdried at 80 °C for 2 h and was added into 1 M NaOH solution, with a dosage of 5 g L À1 , and stirred for 1 h at 25 °C (200 rpm) (Rahman et al 2021). This CaFe/biochar (CO 2 ) was used in another adsorption test, which was repeated four times.…”

Section: Regeneration Of Used Cafe/biochar (Co 2 )mentioning

confidence: 99%

“…Therefore, a physical activation procedure with CO 2 can be applied as a biochar pre-treatment, before the LDH impregnation step, as it offers a large specific surface area (Ma et al 2020). Various studies have already reported the use of different LDHs supported onto biochar to remove phosphate from aqueous solutions through the adsorption process such as MgFe (Rahman et al 2021), MgAl (Alagha et al 2020), andFeAl (Peng et al 2019). Nevertheless, to the best of our knowledge, no available research has been conducted to investigate the adsorption of the phosphate by an adsorbent developed from CaFe/LDH supported onto previously treated biochar with CO 2 physical activation.…”

Section: Introductionmentioning

confidence: 99%

Phosphate adsorption improvement using a novel adsorbent by CaFe/LDH supported onto CO2 activated biochar

Missau

Rodrigues

Bertuol

et al. 2022

Water Science and Technology

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It is imperative to remove phosphate from the aquatic system. This nutrient in excess can cause environmental problems such as eutrophication. Therefore, aiming to enhance phosphate removal, this work presents a novel adsorbent developed from the construction of Ca2+/Fe3+ layer double hydroxides (CaFe/LDH) supported onto biochar physically activated with CO2 [CaFe/Biochar (CO2)]. Pristine biochar was produced from the pyrolysis of Eucalyptus saligna sawdust, activated with CO2, and then impregnated with CaFe/LDH. The CaFe/Biochar (CO2) was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET). The characterization confirmed a proper synthesis of the new adsorbent. Experiments were conducted in the form of batch adsorption. Results indicated that the optimum pH and adsorbent dosage were 2.15 and 0.92 g L−1, respectively. Adsorption kinetics, isotherms, and thermodynamics were also evaluated. Adsorption kinetics and isotherms were better fitted by the pseudo n order and Freundlich models, respectively. Results also indicated a better adsorption capacity (99.55 mg·g−1) at 55 °C. The thermodynamic indicators depicted that the adsorption process was favorable, spontaneous, and endothermic. Overall, CaFe/Biochar (CO2) could be potentially applied for the adsorptive removal of phosphate from an aqueous solution.

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High capacity aqueous phosphate reclamation using Fe/Mg-layered double hydroxide (LDH) dispersed on biochar

Cited by 102 publications

References 60 publications

A data synthesis on the biochar properties and implications for air, soil, and water quality in Brazil

A data synthesis on the biochar properties and implications for air, soil, and water quality in Brazil

Removal of phosphorus using biochar derived from Fenton sludge: Mechanism and performance insights

Phosphate adsorption improvement using a novel adsorbent by CaFe/LDH supported onto CO2 activated biochar

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