In this work, the potential of natural and pretreated palm tree trunk (PTT) as agents for adsorption of an organic dye, 2,6-dichlorophenolindophenol (2,6-DCPIP) from aqueous solutions was probed. Natural and acetic ac...In this work, the potential of natural and pretreated palm tree trunk (PTT) as agents for adsorption of an organic dye, 2,6-dichlorophenolindophenol (2,6-DCPIP) from aqueous solutions was probed. Natural and acetic acid treated PTT were characterized by Fourier transform infrared (FT-IR) spectroscopy and by the point of zero charge (pzc). The biosorption of 2,6-DCPIP was investigated in batch mode using natural and treated PTT. This study was achieved by highlighting several parameters such as the contact time, biosorbents dosage, the initial concentration of 2,6-DCPIP, the pH of the solution, the ionic strength and the interfering ions. The results showed that 2,6-DCPIP was successfully adsorbed from aqueous solutions by natural and treated PTT. The equilibrium was attained after 40 minutes for treated PTT and 20 minutes for natural PTT. The maximum capacity of adsorption was obtained at pH = 2. The adsorption isotherms were investigated and it was found that the experimental data were best described by the Dubinin-Radushkevich isotherm for the natural PTT (R2 = 0.979) and by the Temkin isotherm for the treated PTT (R2 = 0.976). The maximum adsorption capacities determined by Langmuir isotherm were found as 108.932 and 157.233 μmol·g–1 for natural and treated PTT, respectively. The adsorption kinetics was analyzed and was best described by the pseudo-second order model (R2 ≥ 0.998). The diffusion mechanism was studied and the result showed that external mass transfer is the main rate controlling step. The desorption of 2,6-DCPIP is favorable in alkaline medium.展开更多
目的:分析二肽基肽酶样蛋白-6(dipeptidyl-peptidase-like protein 6,DPPX)抗体相关脑炎患者的临床特征。方法:对2016年1月—2025年2月南京医科大学附属脑科医院就诊的5例DPPX抗体相关脑炎患者的临床特点、脑电图、磁共振成像(magnetic ...目的:分析二肽基肽酶样蛋白-6(dipeptidyl-peptidase-like protein 6,DPPX)抗体相关脑炎患者的临床特征。方法:对2016年1月—2025年2月南京医科大学附属脑科医院就诊的5例DPPX抗体相关脑炎患者的临床特点、脑电图、磁共振成像(magnetic resonance imaging,MRI)及预后进行回顾性研究。结果:5例均为男性,年龄14~56岁。5例患者血清DPPX抗体均为阳性,滴度1∶100~1∶10,其中1例合并血清接触蛋白关联蛋白2(contactin-associated protein-like 2,CASPR2)抗体阳性,4例脑脊液DPPX抗体阴性,1例滴度1∶1。2例患者以行为异常起病,1例以癫痫发作起病,1例以记忆力减退起病,1例合并CASPR2抗体阳性患者以多部位游走性肌阵挛起病。4例患者头颅MRI正常,1例头颅MRI提示双侧颞叶异常信号。以癫痫发作起病的患者脑电图背景重度异常合并左前颞尖波、尖慢波频发。结论:DPPX抗体相关脑炎临床表现具有异质性,早期诊断与鉴别困难,免疫治疗有效,易复发。展开更多
文摘In this work, the potential of natural and pretreated palm tree trunk (PTT) as agents for adsorption of an organic dye, 2,6-dichlorophenolindophenol (2,6-DCPIP) from aqueous solutions was probed. Natural and acetic acid treated PTT were characterized by Fourier transform infrared (FT-IR) spectroscopy and by the point of zero charge (pzc). The biosorption of 2,6-DCPIP was investigated in batch mode using natural and treated PTT. This study was achieved by highlighting several parameters such as the contact time, biosorbents dosage, the initial concentration of 2,6-DCPIP, the pH of the solution, the ionic strength and the interfering ions. The results showed that 2,6-DCPIP was successfully adsorbed from aqueous solutions by natural and treated PTT. The equilibrium was attained after 40 minutes for treated PTT and 20 minutes for natural PTT. The maximum capacity of adsorption was obtained at pH = 2. The adsorption isotherms were investigated and it was found that the experimental data were best described by the Dubinin-Radushkevich isotherm for the natural PTT (R2 = 0.979) and by the Temkin isotherm for the treated PTT (R2 = 0.976). The maximum adsorption capacities determined by Langmuir isotherm were found as 108.932 and 157.233 μmol·g–1 for natural and treated PTT, respectively. The adsorption kinetics was analyzed and was best described by the pseudo-second order model (R2 ≥ 0.998). The diffusion mechanism was studied and the result showed that external mass transfer is the main rate controlling step. The desorption of 2,6-DCPIP is favorable in alkaline medium.
