Effective adsorption of phenols using nitrogen-containing porous activated carbon prepared from sunflower plates

Zhang, Zhengguo; Xiao-xia, Yue; An, Fuqiang; Zhou, Wen-Xia; Gao, Jian‐Feng; Wei, Chin‐Chuan

doi:10.1007/s11814-014-0372-0

Cited by 20 publications

(8 citation statements)

References 46 publications

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“…Total fixed carbon of SFP (28%) was lower than CCSFP (34.94%), which indicated that the higher efficiency of CCSFP, than SFP as carbonaceous adsorbent. Furthermore, the lower ash content of the sample indicated the presence of lower amount of inorganic material indicating its suitability as adsorbent (Zhang et al 2015). From Table 4, it was seen that pH zpc of SFP and CCSFP were approximately 7.0 and 8.2, respectively, which indicated the change of some functional groups on surface due to activation.…”

Section: Characterization Of Sfp and Ccsfpmentioning

confidence: 95%

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Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

et al. 2017

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Fluoride pollution in groundwater is a major concern in rural areas. The flower petal of Shorea robusta, commonly known as sal tree, is used in the present study both in its native form and Ca-impregnated activated form to eradicate excess fluoride from simulated wastewater. Response surface methodology (RSM) was used for experimental designing and analyzing optimum condition for carbonization vis-à-vis calcium impregnation for preparation of adsorbent. During carbonization, temperature, time and weight ratio of calcium chloride to sal flower petal (SFP) have been considered as input factors and percentage removal of fluoride as response. Optimum condition for carbonization has been obtained as temperature, 500°C; time, 1 h and weight ratio, 2.5 and the sample prepared has been termed as calcium-impregnated carbonized sal flower petal (CCSFP). Optimum condition as analyzed by one-factor-at-a-time (OFAT) method is initial fluoride concentration, 2.91 mg/L; pH 3 and adsorbent dose, 4 g/L. CCSFP shows maximum removal of 98.5% at this condition. RSM has also been used for finding out optimum condition for defluoridation considering initial concentration, pH and adsorbent dose as input parameters.The optimum condition as analyzed by RSM is: initial concentration, 5 mg/L; pH 3.5 and adsorbent dose, 2 g/L. Kinetic and equilibrium data follow Ho pseudo-secondorder kinetic model and Freundlich isotherm model, respectively. Adsorption capacity of CCSFP has been found to be 5.465 mg/g. At optimized condition, CCSFP has been found to remove fluoride (80.4%) efficiently from groundwater collected from Bankura district in West Bengal, a fluoride-contaminated province in India. Adsorption rate constant of pseudo-second-order adsorption rate equation (g mgMaximum adsorption capacity of the adsorbent (mg/ g) q eSolid phase concentration of fluoride at equilibrium (mg/g) q tSolid phase concentration of fluoride at any time t (mg/g) DS Change in entropy (kJ/mol K) t Contact time (h)Electronic supplementary material The online version of this article

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Section: Characterization Of Sfp and Ccsfpmentioning

confidence: 95%

“…6b that, as adsorbent dose was increased from 2 to 6 g/L, removal increased from 93.5 to 98.8%, after 45 min of contact time. This might be attributed to the availability of larger number of adsorption sites for the same amount of fluoride ions (Biswas et al 2016;Zhang et al 2015). CaF 2 is a very stable compound.…”

Section: Kinetic Studymentioning

confidence: 99%

Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

et al. 2017

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“…All magic-anglespinning (MAS) NMR experiments were performed at a magnetic field of 14.1 T (Larmor frequencies of 600.12, 150.92, and 60.83 MHz for 1 H, 13 C, and 15 N, respectively) on a Bruker Avance-III spectrometer. 1 sweep. 39,40 This pulse sequence was used to suppress the proton background signal and obtain a flat baseline in the spectra.…”

Section: ■ Introductionmentioning

confidence: 99%

Electrochemical Denitrification and Oxidative Dehydrogenation of Ethylbenzene over N-doped Mesoporous Carbon: Atomic Level Understanding of Catalytic Activity by ¹⁵N NMR Spectroscopy

et al. 2020

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Spherical mesoporous carbon (with a particle size in the range of 40–75 μm) was synthesized by nanoreplication of a hard silica template using sucrose as the carbon precursor. The mesoporous carbon with BET surface areas higher than 1200 m2/g was doped with N by a treatment in an aqueous solution of nitric acid and/or in a flow of gaseous ammonia. The highest N content (3.2 wt % of N in bulk) was obtained when both modification methods were combined. Complementary physicochemical characterization techniques, including scanning electron microscopy (SEM), low-temperature N2 adsorption, powder X-ray diffraction (XRD), and Raman spectroscopy revealed the morphology, structure, and textural properties of the synthesized N-loaded carbon materials. For the identification of the detailed chemical structure on the surface of the carbons, 1H, 13C, and 15N solid-state nuclear magnetic resonance (NMR) measurements were performed, and the data were supported by chemical shift calculations with accurate quantum chemistry methods and X-ray photoelectron spectroscopic (XPS) analyses. All NMR experiments were performed at natural isotope abundance. The verified experimental data clearly showed that after the introduction of the N-containing moieties by the combined methods of treatment, a high concentration of pyridinic N at the edge, and pyrrolic N being external to the edge, was achieved for the mesoporous carbon. The distributed N surface species promoted the catalytic activity in the oxidative dehydrogenation of ethylbenzene to styrene but did not significantly influence the efficiency of the carbon materials in the electrochemical reduction of nitrate ions.

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“…[30,[40][41][42][43][44]. Having a microporous structure and high C content, biochar can be used in a range of applications [45].…”

Section: Characterization Of the Charmentioning

confidence: 99%

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Lee¹,

Park²,

Lee³

et al. 2016

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As a replacement for activated carbon, biochar was synthesized and used for the adsorptive removal of formaldehyde and nitrogen oxide. Biochar was produced from the fast pyrolysis of the red marine macro alga, Pyropia tenera. The P. tenera char was then activated with steam, ammonia and KOH to alter its characteristics. The adsorption of formaldehyde, which is one of the main indoor air pollutants, onto the seaweed char was performed using 1-ppm formaldehyde and the char was activated using a range of methods. The char activated with both the KOH and ammonia treatments showed the highest adsorptive removal efficiency, followed by KOH-treated char, ammonia-treated char, steam-treated char, and non-activated char. The removal of 1000-ppm NO over untreated char, KOH-treated char, and activated carbon was also tested. While the untreated char exhibited little activity, the KOH-treated char removed 80% of the NO at 50°C, which was an even higher NO removal efficiency than that achieved by activated carbon.

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Effective adsorption of phenols using nitrogen-containing porous activated carbon prepared from sunflower plates

Cited by 20 publications

References 46 publications

Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

Electrochemical Denitrification and Oxidative Dehydrogenation of Ethylbenzene over N-doped Mesoporous Carbon: Atomic Level Understanding of Catalytic Activity by ¹⁵N NMR Spectroscopy

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

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Effective adsorption of phenols using nitrogen-containing porous activated carbon prepared from sunflower plates

Cited by 20 publications

References 46 publications

Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

Application of response surface methodology for optimization of biosorption of fluoride from groundwater using Shorea robusta flower petal

Electrochemical Denitrification and Oxidative Dehydrogenation of Ethylbenzene over N-doped Mesoporous Carbon: Atomic Level Understanding of Catalytic Activity by 15N NMR Spectroscopy

Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

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Electrochemical Denitrification and Oxidative Dehydrogenation of Ethylbenzene over N-doped Mesoporous Carbon: Atomic Level Understanding of Catalytic Activity by ¹⁵N NMR Spectroscopy