Characteristics of tetracycline adsorption by cow manure biochar prepared at different pyrolysis temperatures

Zhang, Peizhen; Li, Yanfei; Cao, Yaoyao; Han, Lujia

doi:10.1016/j.biortech.2019.121348

Cited by 295 publications

(86 citation statements)

References 39 publications

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“…The H and O content in biochar decreased as a result of the dehydration and dehydrogenation of biochar during the heating process. As the pyrolysis temperature increased, the values for the H/C and (O + N)/C ratios decreased, as a consequence, PC700 is expected to be characterized by the highest aromaticity and the lowest polarity among all the prepared biochar samples 22,23 .…”

Section: Resultsmentioning

confidence: 99%

“…The fact that ΔH is positive and that its value increases as the pyrolysis temperature increases indicates that the adsorption process is endothermic and that p-nitrophenol has more energy when adsorbed onto high-temperature biochar samples than when adsorbed onto low-temperature samples. This result indicates that the interaction between p-nitrophenol and the surface active sites of high-temperature biochar samples is stronger than that between p-nitrophenol and the surface active sites of low-temperature biochar samples, which may be one of the reasons explaining why PC700 displayed the strongest adsorption capacity among the prepared biochar samples 23 . The negative value of ΔG means that the adsorption of p-nitrophenol onto biochar is a spontaneous process, and the absolute number of it is less than 40, indicating that physical adsorption occurs 2 .…”

Section: Factors That Impact P-nitrophenol Adsorption Effect Of Adsomentioning

confidence: 87%

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Adsorption characteristics and mechanism of p-nitrophenol by pine sawdust biochar samples produced at different pyrolysis temperatures

Liu

Deng

Shi

2020

Sci Rep

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Biochar is becoming a low-cost substitute of activated carbon for the removal of multiple contaminants. In this study, five biochar samples derived from pine sawdust were produced at different pyrolysis temperatures (300 °C-700 °C) and used adsorbents to remove p-nitrophenol from water. Results indicate that, as the pyrolysis temperature increases, the surface structure of biochar grows in complexity, biochar's aromaticity and number of functional group decrease, and this material's polarity increases. Biochar's physiochemical characteristics and dosage, as well as solution's pH and environmental temperature significantly influence the p-nitrophenol adsorption behavior of biochar. p-nitrophenol adsorption onto biochar proved to be an endothermic and spontaneous process; furthermore, a greater energy exchange was observed to take place when biochar samples prepared at high temperatures were utilized. the adsorption mechanism includes physical adsorption and chemisorption, whereas its rate is mainly affected by intra-particle diffusion. Notably, in biochar samples prepared at low temperature, adsorption is mainly driven by electrostatic interactions, whereas, in their high-temperature counterparts, p-nitrophenol adsorption is driven also by hydrogen bonding and π-π interactions involving functional groups on the biochar surface.

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Section: Resultsmentioning

confidence: 99%

Section: Factors That Impact P-nitrophenol Adsorption Effect Of Adsomentioning

confidence: 87%

Adsorption characteristics and mechanism of p-nitrophenol by pine sawdust biochar samples produced at different pyrolysis temperatures

Liu

Deng

Shi

2020

Sci Rep

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“…Solution pH can affect the surface charge and ionization degree of HFO, the form, and the ionization degree of TC, consequently influencing the adsorption of TC on HFO. Tetracycline (symbolized as H 2 TC) is an amphoteric molecule with multiple ionizable functional groups and may exist as a cations (H 3 TC + , pH < 3.3), zwitterions (H 2 TC 0 , 3.3 < pH < 7.7), or negatively charged ions (HTC − , 7.7 < pH < 9.7; TC 2 − , pH > 9.7) at different pH values [41]. The effect of pH on TC removal by HFO is shown in Figure 4b.…”

Section: Resultsmentioning

confidence: 99%

Removal of Tetracycline by Hydrous Ferric Oxide: Adsorption Kinetics, Isotherms, and Mechanism

Zang

Song

et al. 2019

IJERPH

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The removal of tetracycline (TC) from solution is an important environmental issue. Here we prepared an adsorbent hydrous ferric oxide (HFO) by adjusting a FeCl3·6H2O solution to neutral pH. HFO was characterized by a surface area analyzer, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), and was used to remove TC from solution. The influence of pH, solid-to-liquid ratio, ionic type, and strength on TC removal was investigated. Adsorption kinetics and isotherms were also determined. HFO after adsorption of TC was analyzed by FTIR and XPS to investigate the adsorption mechanism. The results showed that the adsorption of TC increased from 88.3% to 95% with increasing pH (3.0–7.0) and then decreased. K+ ions had little effect on TC adsorption by HFO. However, Ca2+ and Mg2+ reduced the adsorption of TC on HFO. When the concentrations of Ca2+ and Mg2+ were increased, the inhibitory effect was more obvious. Pseudo-second-order kinetics and the Langmuir model fitted the adsorption process well. The maximum adsorption capacity of TC on HFO reached 99.49 mg·g−1. The adsorption process was spontaneous, endothermic, and increasingly disordered. Combination analysis with FTIR and XPS showed that the mechanism between TC and HFO involved electrostatic interactions, hydrogen interactions, and complexation. Therefore, the environmental behavior of TC could be affected by HFO.

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“…Tetracycline is one of the most abundant antibiotics in livestock farm wastewater, and its adsorption studied over cow manure biochars obtained by the pyrolysis between 300 and 700 °C. [ 86 ] Kinetic modeling suggested that internal particle and liquid film diffusion controlled the rate of tetracycline adsorption. Although additional (and ill‐defined) factors such as pore filling, π–π interactions, and hydrogen bonding were also postulated to influence adsorption.…”

Section: Adsorption Applications Of Bio/hydrocharsmentioning

confidence: 99%

Bio/hydrochar Sorbents for Environmental Remediation

Zhang

Wang

Cai

et al. 2020

Energy & Environ Materials

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An increasing global population and current societal reliance on fossil fuel resources has precipitated an ongoing crisis at the energy-materials-environment nexus. Sustainable resources are required to meet the demands of developed and emerging economies while mitigating climate change and protecting the biosphere; this has promoted the "zero-waste economy" and "trash-to-treasure strategy" concepts. [1] Achieving such ambitious goals necessitates a transition from fossil resources to renewables such as nuclear, solar, wind, and wave power, and biomass. Lignocellulosic biomass, such as agricultural and forestry residues, crops, and wood, is the most abundant (inedible to humans) biomass resource and a potential low-carbon feedstock to partially replace fossil carbon. It comprises cellulose and hemicellulose carbohydrate polymers embedded in a lignin matrix. [2] Lignin is a three-dimensional network of polyaromatic alcohols, whose upgrading can offer routes to renewable valueadded chemicals. [3] Hemicellulose comprises pentose (predominantly xylose) and hexose units connected by glycosidic bonds. Cellulose is a water insoluble, linear polysaccharide formed from glucose units linked via b-1,4-glycosidic bonds. [4] As an important renewable feedstock, biomass, and its conversion to materials, chemicals, and fuels is intensively researched. [5] Biomass conversion may occur through non-catalytic (thermo)chemical routes, e.g., pyrolysis and hydrothermal processing, and/or catalytic (bio)chemical routes, e.g., homogeneous, heterogeneous, and enzymatic catalyzed processes [3,6] (Figure 1). Bio/hydrochars are an important class of solid materials obtainable from biomass due to their applications as adsorbents and catalysts, and as precursors to activated carbons and other functional materials. [7] Bio/hydrochars and activated carbons are all pyrogenic materials, i.e., produced by thermochemical conversion and containing some organic carbon. Activated carbons may derive from any carbon source (fossil, waste, or renewable) and irrespective of sustainability concerns, whereas biochars are (now) viewed as pyrogenic materials derived from sustainably sourced biomass and not used as a fuel. [8] Activated carbons are amorphous and non-graphitic, with high surface areas and (usually) microporosity and a small proportion of hydrogen or oxygen, whereas biochars, and particularly hydrochars, often possess a higher oxygen content. A few studies refer to biochars as pyrochars (being derived by pyrolysis of biomass) and/or conflate the terms pyrochar and hydrochar under the banner of biochars. [9] In this review, we follow widely adopted literature conventions for char definitions [7c,10] : biochar is a carbon-rich, porous solid produced by biomass pyrolysis under restricted oxygen and moderate temperatures (350-700°C), whereas

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Characteristics of tetracycline adsorption by cow manure biochar prepared at different pyrolysis temperatures

Cited by 295 publications

References 39 publications

Adsorption characteristics and mechanism of p-nitrophenol by pine sawdust biochar samples produced at different pyrolysis temperatures

Adsorption characteristics and mechanism of p-nitrophenol by pine sawdust biochar samples produced at different pyrolysis temperatures

Removal of Tetracycline by Hydrous Ferric Oxide: Adsorption Kinetics, Isotherms, and Mechanism

Bio/hydrochar Sorbents for Environmental Remediation

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