Characterization of cadmium removal from aqueous solution by biochar produced from a giant Miscanthus at different pyrolytic temperatures

Kim, Woong Ki; Shim, Taeyong; Kim, Yong Seong; Hyun, Seunghun; Ryu, Changkook; Park, Young-Kwon; Jung, Jinho

doi:10.1016/j.biortech.2013.03.186

Cited by 325 publications

(110 citation statements)

References 27 publications

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“…This evolution is somewhat similar to that reported in the literature [15]. The increase in the surface area and pore volumes might be caused by the progressive degradation of the organic materials (hemicelluloses, cellulose and lignin) and the formation of vascular bundles or channel structures during pyrolysis during the process [46,47]. Hemicellulose has a high reactivity during thermal treatment at lower temperature (usually under 300 • C).…”

Section: Surface Area and Pore Volumesupporting

confidence: 86%

Effect of Temperature on the Structural and Physicochemical Properties of Biochar with Apple Tree Branches as Feedstock Material

2017

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Abstract:The objective of this study was to study the structure and physicochemical properties of biochar derived from apple tree branches (ATBs), whose valorization is crucial for the sustainable development of the apple industry. ATBs were collected from apple orchards located on the Weibei upland of the Loess Plateau and pyrolyzed at 300, 400, 500 and 600 • C (BC300, BC400, BC500 and BC600), respectively. Different analytical techniques were used for the characterization of the different biochars. In particular, proximate and element analyses were performed. Furthermore, the morphological, and textural properties were investigated using scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, Boehm titration and nitrogen manometry. In addition, the thermal stability of biochars was also studied by thermogravimetric analysis. The results indicated that the increasing temperature increased the content of fixed carbon (C), the C content and inorganic minerals (K, P, Fe, Zn, Ca, Mg), while the yield, the content of volatile matter (VM), O and H, cation exchange capacity, and the ratios of O/C and H/C decreased. Comparison between the different samples show that highest pH and ash content were observed in BC500. The number of acidic functional groups decreased as a function of pyrolysis temperature, especially for the carboxylic functional groups. In contrast, a reverse trend was found for the basic functional groups. At a higher temperature, the brunauer-emmett-teller (BET) surface area and pore volume are higher mostly due to the increase of the micropore surface area and micropore volume. In addition, the thermal stability of biochars also increased with the increasing temperature. Hence, pyrolysis temperature has a strong effect on biochar properties, and therefore biochars can be produced by changing pyrolysis temperature in order to better meet their applications.

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Section: Surface Area and Pore Volumesupporting

confidence: 86%

Effect of Temperature on the Structural and Physicochemical Properties of Biochar with Apple Tree Branches as Feedstock Material

2017

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“…Another property of BC that could explain these results is the higher pH of the BC at 700 °C, which has a more pronounced liming effect (when BC is reacted with the soil), thus causing precipitation of Cd or Zn. This is in agreement with the findings of Kim et al (2013), which observed that biochar produced from a giant Miscanthus at higher pyrolytic temperatures (≥ 500 °C) increased the sorption of Cd from aqueous solution up to 13.24 mg g -1 (≈ 59 mmol kg -1 ) and they attributed the results due to the precipitation as Cd(OH) 2 as a consequence of the higher pH and also due to the higher surface area.…”

Section: Adsorption Of CD and Zn In Soilssupporting

confidence: 82%

Influence of Pyrolysis Temperature on Cadmium and Zinc Sorption Capacity of Sugar Cane Straw–Derived Biochar

et al. 2013

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“…Biochar from organic wastes has shown potential for removal of heavy metals from wastewater (Namgay et al, 2010;Major, 2011;Kim et al, 2013;Mohan et al, 2014;Coumar et al, 2016). Heavy metals, a group of elements with at least five times the density of water, are challenging environmental pollutants in places with elevated anthropogenic pressure (di Toppi and Gabbrielli, 1999).…”

Section: Introductionmentioning

confidence: 99%

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

Koetlisi¹,

Muchaonyerwa²

2017

American Journal of Applied Sciences

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Pyrolysis of latrine fecal waste could produce valuable products for minimizing environmental contamination with heavy metals. The objective of this study was to determine yields, characteristics and cadmium (Cd) sorption of biochar from latrine fecal waste and sewage sludge, as affected by pyrolysis temperature. Slow pyrolysis at 350, 550 and 650°C, was used to produce the biochar. In addition to proximate and ultimate analysis, surface area, porosity and functional groups were analyzed. A batch sorption study was conducted to determine the cadmium sorption capacity of the biochar. Biochar from latrine waste had higher yield, ash content, surface area and pore volume and lower total and fixed carbon (C) and volatile matter than from sewage sludge. Yield, volatile matter, total C, nitrogen (N) and hydrogen (H) decreased with pyrolysis temperature, while ash content, surface area and porosity increased. Surface functional groups of the biochar also varied with feedstock and pyrolysis temperature. The Cd sorption capacities were higher for biochar from latrine waste than from sewage sludge. The findings indicated that characteristics of biochar from latrine waste differ from that of sewage sludge origin and has greater potential as an adsorbent for removal of Cd from wastewater.

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Characterization of cadmium removal from aqueous solution by biochar produced from a giant Miscanthus at different pyrolytic temperatures

Cited by 325 publications

References 27 publications

Effect of Temperature on the Structural and Physicochemical Properties of Biochar with Apple Tree Branches as Feedstock Material

Effect of Temperature on the Structural and Physicochemical Properties of Biochar with Apple Tree Branches as Feedstock Material

Influence of Pyrolysis Temperature on Cadmium and Zinc Sorption Capacity of Sugar Cane Straw–Derived Biochar

Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

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