Effect of three artificial aging techniques on physicochemical properties and Pb adsorption capacities of different biochars

Tan, Lianshuai; Ma, Zhanghuai; Yang, Kaiqi; Cui, Qingliang; Wang, Ke; Wang, Tongtong; Wu, Gao‐Lin; Zheng, Jiyong

doi:10.1016/j.scitotenv.2019.134223

Cited by 115 publications

(53 citation statements)

References 55 publications

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“…Wang et al (2020) reviewed the processes of biochar ageing under field conditions. Photochemical and chemical oxidation and microbial transformation have potential to increase the fragmentation (Tan et al, 2020), dissolution (Silber, Levkovitch, & Graber, 2010) and adsorption of biochar (Ren et al, 2018), which modify the physiochemical properties of the biochar. Alternating wetting–drying soil conditions because of variations in temperature, rainfall and irrigation also increase the fragmentation of biochar and further modify the effectiveness of the applied biochar in the field (Feng et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Greater, but not necessarily better: The influence of biochar on soil hydraulic properties

Rabbi

Minasny

Salami

et al. 2021

European J Soil Science

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Biochar is recommended as a soil amendment for its positive influence on soil hydrological properties, which results in improved soil fertility and crop yield. Much research in the last decade has been conducted in field and laboratory conditions on the effect of biochar on the hydraulic properties of soil. However, reported results in the literature are substantially inconsistent. Here we performed a meta‐analysis to capture the variations in change in hydraulic properties of arable soils after application of different rates of biochar. The meta‐analysis revealed that high biochar rates (>50 t ha−1) compared to low rates (<20 t ha−1) significantly improved dry bulk density in sandy and clay soils, in field and laboratory experiments. However, field capacity only improved in laboratory experiments on sandy soils. The plant available water, permanent wilting point and saturated hydraulic conductivity did not significantly increase at high rates of biochar application compared to the low rates when applied to different types of soils in both field and laboratory experiments. We discuss possible reasons for this, including hydrophobicity of the biochar with future research directions. We concluded that the current evidence does not support the notion that the application of biochar improves soils' available water capacity. Highlights Meta‐analysis clarifies the influence of biochar on soil hydraulic properties. Biochar addition at higher rates only improves the water holding capacity of sandy soils. Biochar types and pyrolysis temperatures do not influence soil hydraulic properties. The efficiency of biochar may depend on its pore size distribution and hydrophobicity.

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Section: Discussionmentioning

confidence: 99%

Greater, but not necessarily better: The influence of biochar on soil hydraulic properties

Rabbi

Minasny

Salami

et al. 2021

European J Soil Science

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“…The XRD analysis ( Figure 5) revealed that the principal diffraction peaks at low 2θ angles were sharp and symmetric, indicating the presence of mineral crystals. According to the Jade 6.5 PDF cards [46], the two strong peaks at 26.6 and 29.5 • suggest the presence of SiO 2 and CaCO 3 , respectively. Other strong peaks which suggested CaO, KCl, and CaHPO 4 •2H 2 O were observed on the CB's surface.…”

Section: Xps and Xrdmentioning

confidence: 99%

The Eco-Friendly Biochar and Valuable Bio-Oil from Caragana korshinskii: Pyrolysis Preparation, Characterization, and Adsorption Applications

et al. 2020

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Carbonization of biomass can prepare carbon materials with excellent properties. In order to explore the comprehensive utilization and recycling of Caragana korshinskii biomass, 15 kinds of Caragana korshinskii biochar (CB) were prepared by controlling the oxygen-limited pyrolysis process. Moreover, we pay attention to the dynamic changes of microstructure of CB and the by-products. The physicochemical properties of CB were characterized by Scanning Electron Microscope (SEM), BET-specific surface area (BET-SSA), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), and Gas chromatography-mass spectrometry (GC-MS). The optimal preparation technology was evaluated by batch adsorption application experiment of NO3−, and the pyrolysis mechanism was explored. The results showed that the pyrolysis temperature is the most important factor in the properties of CB. With the increase of temperature, the content of C, pH, mesoporous structure, BET-SSA of CB increased, the cation exchange capacity (CEC) decreased and then increased, but the yield and the content of O and N decreased. The CEC, pH, and BET-SSA of CB under each pyrolysis process were 16.64–81.4 cmol·kg−1, 6.65–8.99, and 13.52–133.49 m2·g−1, respectively. CB contains abundant functional groups and mesoporous structure. As the pyrolysis temperature and time increases, the bond valence structure of C 1s, Ca 2p, and O 1s is more stable, and the phase structure of CaCO3 is more obvious, where the aromaticity increases, and the polarity decreases. The CB prepared at 650 °C for 3 h presented the best adsorption performance, and the maximum theoretical adsorption capacity for NO3− reached 120.65 mg·g−1. The Langmuir model and pseudo-second-order model can well describe the isothermal and kinetics adsorption process of NO3−, respectively. Compared with other cellulose and lignin-based biomass materials, CB showed efficient adsorption performance of NO3− without complicated modification condition. The by-products contain bio-soil and tail gas, which are potential source of liquid fuel and chemical raw materials. Especially, the bio-oil of CB contains α-d-glucopyranose, which can be used in medical tests and medicines.

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“…Thus, the percentage of elimination has been reduced. [38][39][40][41][42][43] This indicates that initial concentrations performing a crucial role in the adsorption of CPS on CSAC. 44 Figure 5C shows the result of the initial CPS concentration's effect on the removal efficiency by CSAC samples.…”

Section: Sorption Studies the Effect Of Adsorption Contact Time And Cps Initial Concentrationmentioning

confidence: 90%

Adsorption isotherm, kinetics, and thermodynamic studies of O,O‐diethyl‐O‐(3,5,6‐trichloropyridin‐2‐yl) phosphorothioate (chlorpyrifos) on cinnamon verum–based activated carbon

Ettish

Abuzalat

Wong

et al. 2021

Int J of Chemical Kinetics

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Cinnamon verum was used as a low-cost precursor to produce microporousactivated carbons with a high surface area (894 m 2 /g) and large total pore volume (0.49 cm 3 /g). Thermogravimetric analysis scanning electron microscopy, Fourier-transform infrared spectroscopy, Brunauer-Emmett-Teller surface area, and pore size analyzer techniques were used to characterize the new sorbent. The new porous carbon's ability to remove chlorpyrifos (CPS), an organo-phosphorus surrogate of ware gases and the active component in most insecticides and pesticides, has been assessed by a batch adsorption procedure. Different sorption factors such as initial CPS concentrations, contact time, pH, solution temperature, and sorbent dosage have been studied. The results show that the new sorbent could remove 100% of CPS at low concentrations of 20 ppm within 20 min of contact time under a favorable sorption process. CPS adsorption was found to be exothermic, and the adsorption capacity decreases with increasing temperature. Equilibrium results were modeled using three isotherm models: Langmuir, Freundlich, and Temkin. The Langmuir isotherm model was found to be the best model to represent the CPS adsorption data. The kinetic results were fitted to pseudo-first-order, pseudo-second-order, and intraparticle diffusion models and thoroughly followed the pseudo-second-order kinetic model. Thermodynamic factors such as enthalpy (ΔH o ), entropy (ΔS o ), and free energy (ΔG o ) were assessed. The negative values of ΔH o and ΔG o indicate the exothermic and spontaneous nature of the adsorption process. The sorbent from waste cinnamon bark was economically practical and eliminates organophosphorus compounds from aqueous solutions.

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Effect of three artificial aging techniques on physicochemical properties and Pb adsorption capacities of different biochars

Cited by 115 publications

References 55 publications

Greater, but not necessarily better: The influence of biochar on soil hydraulic properties

Greater, but not necessarily better: The influence of biochar on soil hydraulic properties

The Eco-Friendly Biochar and Valuable Bio-Oil from Caragana korshinskii: Pyrolysis Preparation, Characterization, and Adsorption Applications

Adsorption isotherm, kinetics, and thermodynamic studies of O,O‐diethyl‐O‐(3,5,6‐trichloropyridin‐2‐yl) phosphorothioate (chlorpyrifos) on cinnamon verum–based activated carbon

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