Increasing Supercapacitor Features Using Reduced Graphene Oxide@Phosphorus

Supercapacitors have attracted much attention in the field of electrochemicalenergy storage. However, material preparation and stability limit their applications inmany fields. Herein, a reduced graphene oxide@phosphorus (rGO@P) electrode wasprepared using a simple inexpensive method. The new graphene structure (rGO@P) wascharacterized by X-ray diraction, Fourier transform infrared spectroscopy, scanningelectron microscopy and Energy-dispersive X-ray spectroscopy.Electrode showed excellent performances (307 F g−1), which seem to be the highestamong many other rGO@P-based electrodes reported so far. It also has an excellentcyclic stability up to 95% after 600 consecutive charge/discharge tests. So, the ease ofthe synthesis method and excellent performance of the prepared electrode materials mathave significant potential for energy storage applications

Computational Investigation on Structural Properties of Carbon Nanotube Binding to Nucleotides According to the QM Methods

The interaction between nucleotides and carbon nanotubes (CNTs) is a subjectof many investigations for treating diseases but there are many questions in this field thatremain unanswered. Because of experimental methods involve assumptions andinterpretation besides limitations, there are many problems that the best study for them isusing theoretical study. Consequently, theoretical methods have become a competitivealternative to experiments for biochemical investigations. In order to search about theresponse of SWCNTs in binding to DNA, the interaction between 3 different sequencesof B-form single-strand DNA (ssDNA) and outer surface of single-walled carbonnanotubes (SWCNTs) is considered. So we studied the interaction between (5`-ATC-3`,5`-TCA-3`,5`-TCG-3`) and SWCNT by using Molecular Mechanic(MM) ,Hartree-Fock(HF) and Density Functional Theory(DFT,B3LYP) methods in gas phase. The basissets used were STO-3G, 6–31G.In current interest, energy, dipole moment, total atomiccharges and NMR parameters calculated to obtain information about the molecularstructures and stability of these combinations. Our results revealed the effect of DNA baseand the sequence of nucleotides on the interaction of DNA/SWCNTs systems. So, we canpredict that diseases with special mutation are the better aim for Gene therapy. Therefore,the outcome reported in this paper indicates that theoretical data can give us essentialinsights into the nature of molecular structures interacted to nanotubes

Thermodynamic study of (pb2+) removal by adsorption onto modified magnetic Graphene Oxide with Chitosan and Cysteine

A new modified magnetic Graphene Oxide with Chitosan and Cysteine wassynthesized for removing Pb2+ ions from aqueous solution. The properties of thisadsorbent were characterized by Field Emission Scanning Electron Microscopy (FESEM),Vibrating Sample Magnetometer (VSM) and Energy Dispersive Analysis Systemof X-ray (EDAX). Physicochemical parameters such as effect of pH, contact time,adsorbent dosage and initial concentration of Pb 2+ was also studied. The results showedthat the maximum capacity of absorbent in Lead ions adsorption (at Equilibriumconcentration of 120 ppm) occurred at pHOptimum= 5.75, tOptimum= 30 min andadsorbent 85.4 mg/g dosage=0.1 gr. Maximum empirical adsorption capacity (qmax) wascalculated 85.4 mg/g. The thermodynamic parameters (ΔHᵒ, ΔGᵒ and ΔSᵒ) showed thatthe adsorption process of Pb 2+ on modified magnetic Graphene Oxide with Chitosanand Cysteine was endothermic and spontaneous. Removal percentage was reduced to15% after five stages of Sorption/desorption studies. So, modified magnetic GrapheneOxide with Chitosan and Cysteine can be used as a complementary process for removalof Pb2+ ions from water and wastewater

The Study of Kinetic and Biosorption of Pb Ion by Rice Husk from Wastewater

Abstract An agricultural waste i.e. rice husk has been used as a cheap adsorbent for the removal ofleadas a harmful heavy metal from contaminated water via adsorption. The adsorption capacity of rice husk was calculated by equilibrium models. The results showed that the adsorption process has the best accordance with Langmuir model. The kinetics of the adsorption was also investigated and obtained that the experimental data has the best fit with pseudo-second kinetic model. In this study, the effect of the adsorbent amount as well aspH value on the results was also investigated