Adsorption Removal of Pollutant Dyes in Wastewater by Nitrogen-doped Porous Carbons Derived from Natural Leaves

Abstract

An easy pyrolysis and activation synthesis method has been proposed to convert a common biomass waste of Euonymus japonicus leaves into nitrogen-doped porous carbons (NPCs), and its application in the removal of methylene blue (MB), methylene orange (MO) and rhodamine B (RhB) from simulated wastewater was further explored. The uptake of NPCs for dyes increases along with the initial dye concentration and contact time but decreases with the NPC dosage. The adsorption capacities of the NPCs for MB, RhB and MO were 626.1, 620.7 and 370.8-1 mg•g , respectively, which meant that the NPCs were better adsorbents for cationic dyes (MB and RhB), compared to the anionic dye (MO), because the NPC surfaces carry partial negative charges. In order to elaborate the adsorption mechanism, the kinetics data were analyzed by pseudo-first order, pseudo-second order, intra-particle diffusion and Elovich models, in which the pseudo-second order model exhibited the best fit. The adsorption data were evaluated by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models, in which the Langmuir model could well describe the adsorption processes. This study presented a potential alternative low-cost high efficient adsorbent for removing pollutant dyes from wastewater through using biomass waste leaves as sources.

Microcellular Conductive Carbon Black or Graphene/PVDF Composite Foam with 3D Conductive Channel: A Promising Lightweight, Heat‐Insulating, and EMI‐Shielding Material

“…[ 11 ] Carbon‐based materials are lightweight and exhibit excellent mechanical properties and thermal stability, and have broad applications as fillers, including in electrodes for supercapacitors [ 12,13 ] and batteries [ 14,15 ] and environmental protection. [ 16 ] The commonly used conductive fillers in CPCs, such as conductive carbon black, [ 17 ] carbon fibers, [ 18 ] carbon nanotubes, [ 8,19 ] graphene, [ 20,21 ] and noble metal nanowires, [ 22,23 ] benefit from their light weight, high specific surface area, and high conductivity. These are excellent fillers [ 24,25 ] to achieve high electrical conductivity.…”

Advanced hybrid membranes for efficient nickel retention from simulated wastewater

“…The negative effects of nickel may be summarized as dermatitis, coughing, human carcinogens. [4][5][6][7][8][9][10][11] Therefore, it has become mandatory to identify viable means of reducing the impact of HMs. For this purpose, a great deal of research has focused on the treatment of wastewaters bearing HMs before their release into water sources.…”

Time and volume‐ratio effect on reusable polybenzoxazole nanofiber oil sorption capacity investigated via machine learning

“…Studies on sorption materials used in wastewater are mostly preferred to be environmentally friendly and deterioration‐resistant against pollutants. Studies are carried out not only on diesel oil but also on semiconductor or composite materials with high sorption capacity for dyes, one of the biggest contaminants in industrial wastewater 31–34 . PBOs are also semi‐conductive materials.…”