scholarly journals Preparation of a Highly Porous Carbon Material Based on Quinoa Husk and Its Application for Removal of Dyes by Adsorption

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1407 ◽  
Author(s):  
Siji Chen ◽  
Shanshan Tang ◽  
Yang Sun ◽  
Gang Wang ◽  
Huan Chen ◽  
...  
Keyword(s):  
Malachite Green ◽  
Porous Carbon ◽  
Carbon Material ◽  
Chemical Activation ◽  
Methyl Violet ◽  
Porous Carbon Material ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Dyeing Wastewater ◽  
X Ray

A porous carbon material was prepared from quinoa husk (QH) by carbonization and chemical activation with KOH. A series of experiments, including SEM (Scanning electron microscopy), FT-IR (Fourier transform infrared), XRD (X-ray diffraction), Raman, X-ray photoelectron spectroscopy (XPS), and N2 adsorption/desorption, were carried out on the porous carbon produced from quinoa husk (PC–QH). The results showed that PC–QH was mainly composed of activated carbon and graphite. Moreover, PC–QH exhibited a high level of porosity with a BET (the Brunauer–Emmett–Teller theory) surface area of 1713 m2 g−1. As a representative dye, malachite green (MG) was selected to evaluate the performance of PC–QH to absorb the contaminants in dyeing wastewater. In batch adsorption experiments, PC–QH exhibited a high adsorption rate toward malachite green (MG). An uptake capacity of 599.90 mg g−1 was achieved in the initial 5 min, and the MG adsorption capacity of PC–QH reached 1365.10 mg g−1, which was higher than many other adsorbents. The adsorption data were well fitted with the Freundlich isotherm model and the pseudo-second-order kinetic model. PC–QH also displayed a high absorption rate to rhodamine B (RhB), methyl violet (MV), methylene blue (MB), and methyl orange (MO). The results in this study suggest that PC–QH can be a promising adsorbent for quick treatment of dyeing wastewater.

scholarly journals Adsorption of Malachite Green Dye onto Mesoporous Natural Inorganic Clays: Their Equilibrium Isotherm and Kinetics Studies

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 965
Author(s):  
Sami Ullah ◽  
Altaf Ur Ur Rahman ◽  
Fida Ullah ◽  
Abdur Rashid ◽  
Tausif Arshad ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Surface Area ◽  
Malachite Green ◽  
Langmuir Isotherm ◽  
Adsorption Behavior ◽  
Area Measurement ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Operational Parameters ◽  
X Ray

Contamination of water with organic dyes is a major environmental concern as it causes serious life-threatening environmental problems. The present research was designed to evaluate the potential of three different natural inorganic clays (NICs) i.e., Pakistani bentonite clay (PB), bentonite purchased from Alfa Aesar (BT), and Turkish red mud (RM) for malachite green (MG) dye removal from an aqueous solution. Various analytical techniques, namely X-ray fluorescence spectrometry (XRF), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller surface area measurement (BET), and thermogravimetric analysis (TGA), were used to investigate the physicochemical properties of the NICs samples. The effect of adsorption operational parameters such as contact time, aqueous phase pH, dye concentration, and amount of NICs on the adsorption behavior of MG onto NICs samples were investigated under the batch adsorption system. The equilibrium and kinetic inspection reflected the best description of MG adsorption behavior by the Langmuir isotherm model and pseudo-first-order kinetic model, respectively. The results indicated that the adsorption was favorable at higher pH. The maximum adsorption capacities calculated by Langmuir isotherm for PB, BT, and RM were found to be 243.90 mg/g, 188.68 mg/g, and 172.41 mg/g, respectively. It can be concluded that natural inorganic clays with a higher surface area can be used as an effective adsorbent material to remove the MG dye from an aqueous solution.

Preparation of porous carbon material by hydrothermal activation of itaconic acid fermentation waste liquid and its efficient adsorption of Cr(VI)

2021 ◽  
Author(s):  
Kun Chen ◽  
Renwei Dai ◽  
Guanjun Xu ◽  
Bernard Wiafe Biney ◽  
Jiahua Shen ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Itaconic Acid ◽  
Porous Carbon ◽  
Carbon Material ◽  
Chemical Activation ◽  
Raw Material ◽  
Porous Carbon Material ◽  
Carbon Microspheres ◽  
Acid Fermentation ◽  
Porous Adsorbent

Carbon microspheres were synthesized using itaconic acid fermentation waste liquid as a raw material by hydrothermal method. The sequential porous adsorbent was prepared (by chemical activation) using carbon microspheres as...

The Interconnected Open-Channel Highly Porous Carbon Material Derived from Pineapple Leaf Fibers as a Sustainable Electrode Material for Electrochemical Energy Storage Devices

2019 ◽  
Vol 798 ◽  
pp. 97-104
Author(s):  
Saran Kingsakklang ◽  
Supacharee Roddecha ◽  
Malinee Sriariyana
Keyword(s):  
Porous Carbon ◽  
Carbon Material ◽  
Chemical Activation ◽  
Reversible Capacity ◽  
Carbon Surface ◽  
Carbon Anode ◽  
Porous Carbon Material ◽  
Energy Storage Devices ◽  
Pineapple Leaf Fiber ◽  
Leaf Fiber

The activated porous carbon anode material was successfully prepared from the agro-waste pineapple leaf fiber by using the simple hydrothermal technique and KOH chemical activation under heat treatment in Ar atmosphere. The obtained amorphous activated carbon with three-dimensional interconnected porous structure exhibited a high specific surface area of about 1520 m2/g. Furthermore, polyaniline (PANI) conductive polymer was grown on the porous carbon surface to promote its capacitance for the preliminary test as the anode for a lithium battery. The SEM characterization revealed the homogeneous longitudinal growth of polyaniline crystalline at the applied concentration of 0.03M aniline monomers on the surface of targeted porous carbon. The pineapple leaf fiber derived activated porous carbon could exhibit high capacity density as 320 mAh/g for the initial charge-discharge test and then substantially dropped to the reversible capacity of about 63 mAh/g at a current density of 0.5C. After composited with polyaniline, the porous carbon/polyaniline composite showed the superior initial capacity density of 425 mAh/g with the following improved reversible capacity by 27% relative to that of the bared porous carbon material. Moreover, the conducted porous carbon/polyaniline composite could also sustain higher cycle stability after 50 cycling tests.

scholarly journals Assessing Strong Consistency of Symmetrical Solid-state Supercapacitors Based on Three-dimensional Porous Carbon Material

2021 ◽  
Author(s):  
P.A. Le ◽  
Van Qui Le ◽  
Thi Viet Bac Phung ◽  
Nghia Trong Nguyen
Keyword(s):  
Solid State ◽  
Energy Density ◽  
Specific Capacitance ◽  
Current Density ◽  
Porous Carbon ◽  
Carbon Material ◽  
Chemical Activation ◽  
Three Dimensional ◽  
Porous Carbon Material ◽  
Maximum Specific Capacitance

Abstract Three-dimensional (3D) porous carbon material enhances the electrochemical performance of symmetrical solid-state supercapacitors which are prepared by using abundant biomass waste as electrodes and (PVA-Li2SO4) gel polymer electrolyte. A saving and simple carbonization method with KOH chemical activation is developed for synthesizing highly porous carbon from peanut shell with high specific surface area of 1348 m2 g–1, which can be reused the chemical activation solution. The electrodes making by such three-dimensional porous carbon in a 1 M Li2SO4 electrolyte demonstrates a maximum specific capacitance of 386 F g–1 at current density of 2 A g–1, energy density and power density of 53.61 Wh k g–1 and 1000 W kg–1, respectively. The symmetrical solid state supercapacitors with sandwich structure of (3D porous carbon P/PVA-Li2SO4/3D porous carbon P) exhibits a maximum specific capacitance of 116 F g-1 at current density of 0.5 A g–1. The energy density and power density are the value of 9 W h kg–1 and 380 W kg–1, respectively. Further, the supercapacitors also demonstrate good cycling stability 89 % retention after 7000 cycles.

scholarly journals Synthesis and electrochemical study of phosphorus-doped porous carbon for supercapacitor applications

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Sangeeta Rawal ◽  
Yogesh Kumar ◽  
U. K. Mandal ◽  
Ashwani Kumar ◽  
Ruchika Tanwar ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Porous Carbon ◽  
Carbon Material ◽  
Chemical Activation ◽  
Cycling Performance ◽  
Electrochemical Study ◽  
Specific Power ◽  
Porous Carbon Material ◽  
Appreciable Change ◽  
Wide Range

AbstractIn the present investigation, we report the incorporation of phosphorous (P) atoms in the activated carbon and study its effect on the electrochemical performance. Porous carbon is synthesized by the chemical activation method from a bioresource and then pretreated with nitric acid. Phosphorus atoms were doped by the simple chemical method. The obtained phosphorous-doped nano-materials show an appreciable change of porosity and creation of a more wide range of meso- and macropores, and this affects their adsorption and electrochemical performance. The electrochemical study shows that doped carbon obtained at 850 °C (ACtP-850) delivers the maximum specific capacitance (328 Fg−1) in neutral aqueous electrolyte (1 M Na2SO4). The doped carbon material not only exhibits good cycling performance but also the highest specific energy of 29 Wh kg−1 corresponding to a specific power of 646 W kg−1. The improved capacitive performance of phosphorous-doped porous carbon material proposes its use in energy storage applications.

scholarly journals Release of toxic methylene blue from water by mesoporous silicalite-1: characterization, kinetics and isotherm studies

2021 ◽  
Vol 11 (7) ◽  
Author(s):  
Sabarish Radoor ◽  
Jasila Karayil ◽  
Aswathy Jayakumar ◽  
Jyotishkumar Parameswaranpillai ◽  
Suchart Siengchin
Keyword(s):  
Electron Microscopy ◽  
Contact Time ◽  
Dye Removal ◽  
Batch Adsorption ◽  
Aqueous Environment ◽  
Order Kinetic ◽  
Adsorption Method ◽  
X Ray ◽  
Ft Ir ◽  
Adsorption Desorption

AbstractIn the present work, we have developed a mesoporous silicalite-1 using CMC as a template for the removal of MB from aqueous solution. The synthesized silicalite-1 were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), Energy-dispersive X-ray spectroscopy (EDAX) and N2 adsorption–desorption isotherm (BET). XRD and FT-IR analysis confirmed the formation of crystallinity and development of MFI structure in the mesoporous silicalite-1. The adsorption of MB dye on mesoporous silicalite-1 was conducted by batch adsorption method. The effect of various parameters such as adsorbent dosage, initial dye concentration, contact time and temperature on the dye uptake ability of silicalite-1 was investigated. The operating parameters for the maximum adsorption are silicalite-1 dosage (0.1 wt%), contact time (240 min), initial dye concentration (10 ppm) and temperature (30 ℃). The MB dye removal onto mesoporous silicalite-1 followed pseudo-second-order kinetic and Freundlich isotherm. The silicalite-1 exhibits 86% removal efficiency even after six adsorption–desorption cycle. Therefore, the developed mesoporous silicalite-1 is an effective eco-friendly adsorbent for MB dye removal from aqueous environment.

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