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Mandal, Sanchita,Sarkar, Binoy,Igalavithana, Avanthi Deshani,Ok, Yong Sik,Yang, Xiao,Lombi, Enzo,Bolan, Nanthi Elsevier Applied Science 2017 Bioresource technology Vol.246 No.-
<P><B>Abstract</B></P> <P>Objective of this study was to investigate the mechanisms of 2,4-Dichlorophynoxy acetic acid (2,4-D) sorption on biochar in aqueous solutions. Sorption isotherm, kinetics, and desorption experiments were performed to identify the role of biochars’ feedstock and production conditions on 2,4-D sorption. Biochars were prepared from various green wastes (tea, burcucumber, and hardwood) at two pyrolytic temperatures (400 and 700°C). The tea waste biochar produced at 700°C was further activated with steam under a controlled flow. The sorption of 2,4-D was strongly dependent on the biochar properties such as specific surface area, surface functional groups, and microporosity. The steam activated biochar produced from tea waste showed the highest (58.8mgg<SUP>−1</SUP>) 2,4-D sorption capacity, which was attributed to the high specific surface area (576m<SUP>2</SUP> g<SUP>−1</SUP>). The mechanism of 2,4-D removal from aqueous solution by biochar is mainly attributed to the formation of heterogeneous sorption sites due to the steam activation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Steam activated tea waste biochar sorbed the highest amount of 2,4-D. </LI> <LI> Steam activation increased biochar surface area and conserved oxygen-containing functional groups. </LI> <LI> 2,4-D desorption was lowest in steam activated biochar. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Francisco Caiza-Zambrano,Carolina Mora Palacio,Silvia Garbugino,Fabio Maximiliano Gonzalez,Marta Bala Biolcati,Miguel Ángel Saucedo,Carlos Rugilo,Mariano Forrester,Fernando Lombi,Manuel Fernández Pard 대한신경중재치료의학회 2022 Neurointervention Vol.17 No.1
Central venous disease (CVD) is a serious complication in hemodialysis patients. Neurological manifestations are rare. We describe a female with end-stage renal disease with throbbing headache accompanied by paresthesia, weakness, and abnormal posture of her right hand during dialysis sessions. Motor symptoms completely resolved after each dialysis session, although the headaches persisted for several hours. No neurological deficit was evidenced on physical examination. Digital subtraction angiography identified an incomplete thrombosis of the left brachiocephalic vein with retrograde flow in the internal jugular vein, sigmoid sinus, and transverse sinus on the left side. This case illustrates that cerebral venous congestion due to CVD can produce neurological symptoms. Furthermore, we systematically review the literature to identify the characteristics of the cases described so far. This allows clinicians to know the entity and have a high index of suspicion in a hemodialysis patient who develops neurological symptoms.