Tailoring metal-impregnated biochars for selective removal of natural organic matter and dissolved phosphorus from the aqueous phase

Tomin, Oleksii; Vahala, Riku; Yazdani, Maryam Roza

doi:10.1016/j.micromeso.2021.111499

Cited by 23 publications

(10 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar phenomena have been previously reported in preparation of activated biochars from eucalyptus and bamboo wood [4,20]. The FTIR troughs around 2068-2100 cm -1 , which correspond to C≡C stretching [4,6], were relatively unchanged after pyrolysis. The band between 1100-1000 cm -1 (C-O-C stretch of the ethers present in lignin) [23] was still present in BC800 but at a less prominent level.…”

Section: Results and Discussion 1) Characteristics Of The Adsorbentssupporting

confidence: 86%

“…The other study using river water with a DOC of 4.13 mg L -1 reporting that commercial coconut shell-based AC achieved 49.64% DOC removal [4]. The metal-impregnated biochars derived from softwood sawdust in the range of 0.5-2 g L -1 could remove 87-96% of DOM [6]. Thus, BC800 has greater DOM removal efficiency compared to other pristine biochar and not far behind compared to commercial AC, and future study should focus on alkali activation and metal-impregnation to improve DOM removal efficiency of biochar.…”

Section: ) Adsorption Of Dom By Biocharmentioning

confidence: 98%

“…With a proper pyrolysis temperature and modification process, biochar can be used to target removal of specific contaminants. For environmental applications, biochar has been used as an adsorbent for decontamination of water and wastewater, including removal of dissolved organic matter (DOM) [4][5], DOM and phosphorus [6], toxic metals [7], and emerging contaminants [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Disinfection By-product Precursor Removal by Biochar Derived from Agricultural Waste

et al. 2022

View full text Add to dashboard Cite

Biochar made from agricultural waste products can be used as a low-cost adsorbent targeting dissolved organic matter (DOM). In water treatment plant (WTP), DOM reacts with chlorine-based disinfectant and forms carcinogenic disinfection by-products. The objective of this study was to investigate the applicability of bamboo biochar derived from wood vinegar production waste as an adsorbent for DOM removal and subsequently trihalomethane formation potential (THM-FP) reduction. Raw biochar (BCRaw) and 800°C post-heated biochar (BC800) was tested for its surface characteristics including scanning electron microscopy, Fourier transform infrared spectroscopy and Brunauer, Emmett and Teller analysis. The post-pyrolysis treatment increased the surface area of the biochar from 90.3 to 274 m2 g-1. Raw natural water collected from Tapra WTP, Khon Kaen, Thailand, which uses the Chi River as its water source. The adsorption capacities for dissolve organic carbon at 24-h equilibrium (Qe) of BCRaw and BC800 were 0.148 and 0.551 mg-C g-1 adsorbent, respectively. The adsorption kinetics were described well with a pseudo-second order model, which implied chemisorption and multiple adsorption mechanisms. While THM-FP was relatively unaffected by a treatment with BCRaw, a treatment with BC800 resulted in 12.4% THM-FP reduction and preferential removal of precursor to chloroform over other THMs was observed. Fluorescent excitation-emission matric spectroscopy was employed to characterize DOM before and after treatment with biochar. BC800 achieved greater removal of terrestrial humic-like and fulvic-like DOM, due to the presence of oxygen functional groups, which enhances removal capacity for aromatic compounds. Overall, this study shows the potential use of bamboo biochar derived from waste material as an adsorbent for THM precursor removal.

show abstract

Section: Results and Discussion 1) Characteristics Of The Adsorbentssupporting

confidence: 86%

Section: ) Adsorption Of Dom By Biocharmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Disinfection By-product Precursor Removal by Biochar Derived from Agricultural Waste

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Carbon-based porous material generated from the pyrolysis of biomass under anoxic condition is called biochar (Tu et al 2019). As an emerging adsorbent, biochar has good applications in the remediation of polluted environments (Fan et al 2020a, b;Pei et al 2021;Tomin et al 2021). However, the adsorption ability of biochar depends on the type of raw material used, pyrolysis condition, pore structure, functional group composition, and surface charge (Ren et al 2021;Zhang et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Fang

Ali

Gao

et al. 2022

Biochar

View full text Add to dashboard Cite

Conversion of organic waste into engineered metal-biochar composite is an effective way of enhancing biochar’s efficiency for adsorptive capture of phosphorus (P) from aqueous media. Thus, various strategies have been created for the production of metal-biochar composites; however, the complex preparation steps, high-cost metal salt reagent application, or extreme process equipment requirements involved in those strategies limited the large-scale production of metal-biochar composites. In this study, a novel biochar composite rich in magnesium oxides (MFBC) was directly produced through co-pyrolysis of magnesite with food waste; the product, MFBC was used to adsorptively capture P from solution and bio-liquid wastewater. The results showed that compared to the pristine food waste biochar, MFBC was a uniformly hybrid MgO biochar composite with a P capture capacity of 523.91 mg/g. The capture of P by MFBC was fitted using the Langmuir and pseudo-first-order kinetic models. The P adsorptive capture was controlled by MgHPO4 formation and electrostatic attraction, which was affected by the coexisting F− and CO32− ions. MFBC could recover more than 98% of P from the solution and bio-liquid wastewater. Although the P-adsorbed MFBC showed very limited reusability but it can be substituted for phosphate fertiliser in agricultural practices. This study provided an innovative technology for preparing MgO-biochar composite against P recovery from aqueous media, and also highlighted high-value-added approaches for resource utilization of bio-liquid wastewater and food waste. Graphical Abstract

show abstract

“…Biochars are carbonized biomass, commonly used for soil and water treatment purposes. They have become popular as adsorbents thanks to their high porosity, adsorptive surface functionality, and the possibility of tailoring their properties for enhanced removal of specific pollutants [1][2][3]. In addition to promising adsorptive properties, biochar is relatively easy and cost-effective to produce from locally available biomass sources.…”

Section: Introductionmentioning

confidence: 99%

Production and characterization of porous magnetic biochar: before and after phosphate adsorption insights

Tomin

Yazdani

2022

J Porous Mater

Self Cite

View full text Add to dashboard Cite

The modification process of biochars enables different advantages including enhanced adsorption properties for different pollutants. Herein, porous magnetic biochars (PMB) were successfully produced from softwood biomass through a two-step pyrolysis process together with FeCl3 modification. The effect of production temperature on adsorption was studied at 200 or 300 °C, followed by iron salt modification and subsequent pyrolysis at 600 or 800 °C. Biochars were characterized before and after phosphate adsorption via various characterization methods to acquire structural, elemental, and morphological properties of the adsorbent. The effects of phosphate concentration, contact time, and temperature on the adsorption process were examined in the batch mode. The characterization showed embedded iron oxide crystals of 23 nm within the biochar structure with a magnetic strength of 38.9 emu/g, which can assist the separation process of the powdered adsorbent from the aqueous medium. The surface area of the PMB was measured as 93 m2/g and 0.002 cm3/g pore volume. PMB showed complete removal (100%) of phosphate at the lower concentration (5 mg/l P). At higher concentration (25 mg/l P), the biochar prepared under 200/800 °C showed the highest removal (30%). The adsorption was enhanced with time (optimal 3 h) and temperature, which shows endothermic chemisorption following Langmuir isotherm and Pseudo-second order kinetic models. The desorption study suggested the slow release of phosphate from the spent adsorbent and potential reuse for soil enhancement. These results point towards the sustainable use of PMB as an effective and magnetically recyclable adsorbent for phosphate removal and reclaim.

show abstract

Tailoring metal-impregnated biochars for selective removal of natural organic matter and dissolved phosphorus from the aqueous phase

Cited by 23 publications

References 34 publications

Disinfection By-product Precursor Removal by Biochar Derived from Agricultural Waste

Disinfection By-product Precursor Removal by Biochar Derived from Agricultural Waste

Preparation and characterization of MgO hybrid biochar and its mechanism for high efficient recovery of phosphorus from aqueous media

Production and characterization of porous magnetic biochar: before and after phosphate adsorption insights

Contact Info

Product

Resources

About