In this paper, biochar (BC) was used as raw material, activated by deionizing aqueous solution, NaCl solution, CA solution and HCl solution respectively. Epichlorohydrin (EPI) was used as crosslinking agent, and β-cy...In this paper, biochar (BC) was used as raw material, activated by deionizing aqueous solution, NaCl solution, CA solution and HCl solution respectively. Epichlorohydrin (EPI) was used as crosslinking agent, and β-cyclodextrin (β-CD) was used to modify biochar (BC). The prepared modified biochar materials were labeled with β-CDBC, β-CDBC-Na, β-CDBC-CA and β-CDBC-H, respectively. The infrared spectrum, X-ray diffractometer, scanning electron microscope and specific surface area of the four modified materials were tested. The results showed that the C-O stretching vibration peak at 1020 cm<sup>−</sup><sup>1</sup> of the modified materials was slightly offset compared with that of biochar. The characteristic absorption peaks of XRD pattern decrease obviously at 2θ = 26.7˚ and 29.5˚. It can be obviously observed on the electron microscope image that the surface is loaded or formed clathrates, and BET data and graphs also show that the specific surface area of the modified biochar is larger. Therefore, β-cyclodextrin successfully modified biochar and formed clathrates on the surface of biochar or was loaded in the pore structure of biochar, especially β-CDBC-CA achieved better modification effect. Because biochar and β-cyclodextrin raw materials are cheap, easy to prepare and green, and less prone to secondary pollution, it has a good advantage in environmental governance.展开更多
In this study, the adsorption effect of β-cyclodextrin modified biochar (BC) on phenanthrene (PHE) in contaminated soil was investigated, aiming to provide an efficient and environmentally friendly remediation strate...In this study, the adsorption effect of β-cyclodextrin modified biochar (BC) on phenanthrene (PHE) in contaminated soil was investigated, aiming to provide an efficient and environmentally friendly remediation strategy for Polycyclic Aromatic Hydrocarbons (PAHs) contaminated soil. Through kinetic and isotherm analysis, β-CDBC-CA showed excellent phenanthrene adsorption performance, and the adsorption effect increased with the increase of time and was affected by temperature. The results show that β-CDBC-CA can not only effectively adsorb phenanthrene in soil, but also serve as a surfactant to help desorption phenanthrene adsorbed by soil organic matter and improve the efficiency of microbial degradation. The experimental data showed that the Elovich model could describe the adsorption behavior of β-CDBC-CA on phenanthrene well, while Langmuir and Freundlich models performed better in fitting parameters, revealing the adsorption mechanism of phenanthrene in contaminated soil by β-cyclodextrin-modified biochar. In addition, temperature has a significant effect on the adsorption capacity of β-CDBC-CA, and its application in soil remediation can be optimized by adjusting temperature. This study not only provides new materials and technical means for soil remediation but also provides important data support for an in-depth understanding of the environmental behavior of PAHs. By citing relevant research results, this study further improves the control and understanding of environmental risks of PAHs, which is of great significance for the protection of ecological environment and human health.展开更多
目的:探讨晚期肺腺癌患者培美曲塞二钠联合铂类化疗后应用培美曲塞二钠同药维持治疗的临床疗效和不良反应。方法:回顾性分析北京怀柔医院2013年1月至2020年8月收治的经过培美曲塞二钠联合铂类方案化疗后疾病获得控制的Ⅳ期肺腺癌患者35...目的:探讨晚期肺腺癌患者培美曲塞二钠联合铂类化疗后应用培美曲塞二钠同药维持治疗的临床疗效和不良反应。方法:回顾性分析北京怀柔医院2013年1月至2020年8月收治的经过培美曲塞二钠联合铂类方案化疗后疾病获得控制的Ⅳ期肺腺癌患者35例的临床资料,患者联合化疗结束后开始应用培美曲塞二钠维持治疗直至疾病进展。对35例患者的临床特点、治疗效果、不良反应、无进展生存时间(PFS)及总生存时间(DS)进行评价。结果:在治疗效果上,35例患者中完全缓解(CR)0例,部分缓解(PR)11例,稳定(SD)22例,进展(PD)2例,客观缓解率(ORR)为31.4%,疾病控制率(DCR)为94.3%,中位无进展时间(MPFS)为9.53个月,中位总生存时间(MOS)为18.21个月,1年生存率为68.6%,2年生存率为31.4%,3年生存率为11.4%。不同性别、年龄、有无吸烟、培美曲塞一线或二线治疗线数基线特征均未对PFS有影响(均 P > 0.05),基因突变阳性、接受4个及4个以上化疗周期对PFS有保护作用(均 P < 0.05)。化疗相关不良反应主要为骨髓抑制、恶心、转氨酶升高、肾脏毒性。主要不良反应为轻症反应,经对症处理后可缓解。 结论:培美曲塞二钠在晚期肺腺癌患者维持治疗中疗效突出且安全性好。该研究成果具备科学性。展开更多
文摘In this paper, biochar (BC) was used as raw material, activated by deionizing aqueous solution, NaCl solution, CA solution and HCl solution respectively. Epichlorohydrin (EPI) was used as crosslinking agent, and β-cyclodextrin (β-CD) was used to modify biochar (BC). The prepared modified biochar materials were labeled with β-CDBC, β-CDBC-Na, β-CDBC-CA and β-CDBC-H, respectively. The infrared spectrum, X-ray diffractometer, scanning electron microscope and specific surface area of the four modified materials were tested. The results showed that the C-O stretching vibration peak at 1020 cm<sup>−</sup><sup>1</sup> of the modified materials was slightly offset compared with that of biochar. The characteristic absorption peaks of XRD pattern decrease obviously at 2θ = 26.7˚ and 29.5˚. It can be obviously observed on the electron microscope image that the surface is loaded or formed clathrates, and BET data and graphs also show that the specific surface area of the modified biochar is larger. Therefore, β-cyclodextrin successfully modified biochar and formed clathrates on the surface of biochar or was loaded in the pore structure of biochar, especially β-CDBC-CA achieved better modification effect. Because biochar and β-cyclodextrin raw materials are cheap, easy to prepare and green, and less prone to secondary pollution, it has a good advantage in environmental governance.
文摘In this study, the adsorption effect of β-cyclodextrin modified biochar (BC) on phenanthrene (PHE) in contaminated soil was investigated, aiming to provide an efficient and environmentally friendly remediation strategy for Polycyclic Aromatic Hydrocarbons (PAHs) contaminated soil. Through kinetic and isotherm analysis, β-CDBC-CA showed excellent phenanthrene adsorption performance, and the adsorption effect increased with the increase of time and was affected by temperature. The results show that β-CDBC-CA can not only effectively adsorb phenanthrene in soil, but also serve as a surfactant to help desorption phenanthrene adsorbed by soil organic matter and improve the efficiency of microbial degradation. The experimental data showed that the Elovich model could describe the adsorption behavior of β-CDBC-CA on phenanthrene well, while Langmuir and Freundlich models performed better in fitting parameters, revealing the adsorption mechanism of phenanthrene in contaminated soil by β-cyclodextrin-modified biochar. In addition, temperature has a significant effect on the adsorption capacity of β-CDBC-CA, and its application in soil remediation can be optimized by adjusting temperature. This study not only provides new materials and technical means for soil remediation but also provides important data support for an in-depth understanding of the environmental behavior of PAHs. By citing relevant research results, this study further improves the control and understanding of environmental risks of PAHs, which is of great significance for the protection of ecological environment and human health.
文摘目的:探讨晚期肺腺癌患者培美曲塞二钠联合铂类化疗后应用培美曲塞二钠同药维持治疗的临床疗效和不良反应。方法:回顾性分析北京怀柔医院2013年1月至2020年8月收治的经过培美曲塞二钠联合铂类方案化疗后疾病获得控制的Ⅳ期肺腺癌患者35例的临床资料,患者联合化疗结束后开始应用培美曲塞二钠维持治疗直至疾病进展。对35例患者的临床特点、治疗效果、不良反应、无进展生存时间(PFS)及总生存时间(DS)进行评价。结果:在治疗效果上,35例患者中完全缓解(CR)0例,部分缓解(PR)11例,稳定(SD)22例,进展(PD)2例,客观缓解率(ORR)为31.4%,疾病控制率(DCR)为94.3%,中位无进展时间(MPFS)为9.53个月,中位总生存时间(MOS)为18.21个月,1年生存率为68.6%,2年生存率为31.4%,3年生存率为11.4%。不同性别、年龄、有无吸烟、培美曲塞一线或二线治疗线数基线特征均未对PFS有影响(均 P > 0.05),基因突变阳性、接受4个及4个以上化疗周期对PFS有保护作用(均 P < 0.05)。化疗相关不良反应主要为骨髓抑制、恶心、转氨酶升高、肾脏毒性。主要不良反应为轻症反应,经对症处理后可缓解。 结论:培美曲塞二钠在晚期肺腺癌患者维持治疗中疗效突出且安全性好。该研究成果具备科学性。
基金financially supported by the National Natural Science Foundation of China(22161142005,21975086)the Science and Technology Department of Hubei Province(2019CFA008)。
