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- 저자 : Zhonghai Sun (검색결과 5 건)
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Zhonghai Sun,Zhansheng Wu,Dandan Liu,Xiufang He 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.2
Polycyclic aromatic hydrocarbons (PAHs) are toxic pollutants harmful to humans. To improve the adsorption capacity of PAHs on activated carbon (AC) from the aqueous system, AC was modified with cationic surfactants through microwave heating. Naphthalene is a typical PAH used as a model pollutant to test the adsorption properties of sample; the sample with the best adsorption performance was named SAC. The SAC was characterized by SEM, FTIR and BET in detail compared with AC. The specific surface area and the average pore size of SAC increased by nearly 100m2 g−1 and 0.14 nm more than the original AC, respectively. The adsorption experiment was carried out by batch technique with variables such as contact time, adsorbent amount, pH and temperature. Results showed that naphthalene was adsorbed rapidly during the first 20min, and thereafter reached adsorption equilibrium in 40 min. The adsorption kinetics of naphthalene on SAC can be well described by the pseudo-second-order model and the Freundlich isotherm model better fitted the adsorption isotherms of naphthalene on SAC. Naphthalene adsorption process on SAC was spontaneous and temperature was found to negatively affect the adsorption capacity. Furthermore, film diffusion was confirmed the rate limiting step. The π-π stacking electron donor acceptor interaction, hydrophobic interaction and hydrogen bonding may play more key roles in naphthalene adsorption on SAC than AC. Thus, microwave- assisted surfactants modification was proven to be an effective method to enhance the adsorption of naphthalene onto SAC from aqueous solution.
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Comparison study of naphthalene adsorption on activated carbons prepared from different raws
Pengyun Liu,Zhansheng Wu,Zhonghai Sun,Jun Ye 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.10
Five activated carbons (ACs) from apricot shells (ACAS), mixture of lignin and cellulose (ACLC), wood (ACW), walnut shells (ACWS), and coal (CAC) were prepared and used as adsorbents to study the adsorption behavior of naphthalene. All ACs were characterized by scanning electron microscopy, N2 adsorption-desorption method, Xray photoelectron spectroscopy, and elemental analysis. The effects of initial concentration, contact time, ionic strength, pH, and temperature on the adsorption of ACs for naphthalene were examined. Results show that CAC exhibit higher micropore specific surface area and contain more C-O bond than other ACs. Except for ACW, CAC is the least polar or the most hydrophobic adsorbent among ACs. This finding may be helpful in the formation of hydrogen bonding between CAC and naphthalene. The adsorption quantity of CAC was 227.03mg g1 at 303K, which was considerably higher compared with that of other ACs. The kinetics process of naphthalene on all ACs was controlled by pseudo-second-order kinetic model. The adsorption equilibrium of naphthalene on ACs was reached at 40min. The adsorption isotherms of naphthalene to ACs were consistent with the Freundlich isotherm model. The result of thermodynamic analysis shows that the adsorption occurs spontaneously. Moreover, the higher starting naphthalene concentration and lower adsorption temperature significantly can enhance the adsorption capacity of CAC. The maximum adsorption value of naphthalene on ACs was also observed at pH 4 under the same conditions. Moreover, the increase in ionic strength slightly promotes the adsorption of naphthalene on ACs. The microporous structure, element content and surface functional group of ACs affect its adsorption capacity.
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Zhong Hai,Zhang Wenshuang,Sun Shicheng,Bie Yifan 대한영상의학회 2022 Korean Journal of Radiology Vol.23 No.8
Objective: To determine the anatomical characteristics of the petrous ridge and trigeminal nerve in trigeminal neuralgia (TN) without neurovascular compression (NVC). Materials and Methods: From May 2017 to March 2021, 66 patients (49 female and 17 male; mean age ± standard deviation [SD], 56.8 ± 13.3 years) with TN without NVC and 57 controls (46 female and 11 male; 52.0 ± 15.6 years) were enrolled. The angle of the petrous ridge (APR) and angle of the trigeminal nerve (ATN) were measured using magnetic resonance imaging with a high-resolution three-dimensional T2 sequence. Data on the symptomatic side were compared with those on the asymptomatic side in patients and with the mean measurements of the bilateral sides in controls. Receiver operating characteristic (ROC) analysis was conducted to evaluate the performance of APR and ATN in distinguishing TN patients from controls. Results: In TN patients without NVC, the mean ± standard deviation (SD) of APR on the symptomatic side (98.40° ± 19.75°) was significantly smaller than that of the asymptomatic side (105.59° ± 22.45°, p = 0.019) and controls (108.44° ± 15.98°, p = 0.003). The mean ATN ± SD on the symptomatic side (144.41° ± 8.92°) was significantly smaller than that of the asymptomatic side (149.67° ± 8.09°, p = 0.003) and controls (150.45° ± 8.48°, p = 0.001). The area under the ROC curve for distinguishing TN patients from controls was 0.673 (95% confidence interval [CI]: 0.579–0.758) for APR and 0.700 (CI: 0.607–0.782) for ATN. The sensitivity and specificity using the diagnostic cutoff yielding the highest Youden index were 81.8% (54/66) and 49.1% (28/57), respectively, for APR (with a cutoff score of 94.30°) and 65.2% (43/66) and 66.7% (38/57), respectively, for ATN (cutoff score, 148.25°). Conclusion: In patients with TN without NVC, APR and ATN were smaller than those in controls, which may explain the potential cause of TN and provide additional information for diagnosis.
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