Fabrication of N-doping activated carbon (NDAC) from saw dust/ZnCl2 for Acid Brown 14 dye removal from water

Abstract

Nitrogen-doped activated carbon (NDAC) was prepared from saw dust/zinc chloride (2:1) by heating under the flow of ammonia gas at 600 °C, 700 °C, and 800 °C and tested for Acid Brown 14 (AB14) dye adsorption from aquatic solution. The fabricated N-doping activated carbons (NDACs) were characterized by FTIR, TGA, DTA, BET, BJH, MP, t-plot, SEM, EDX, and XRD. The NDACs fabricated at 600 °C, 700 °C, and 800 °C were tested for their capacity to adsorb AB14 dye from water. The nitrogen mass % content in the prepared activated carbon ranged between 17.99 and 21.43%. The NDAC prepared at 600 °C specific surface area, monolayer volume, and mesoporous mean pore diameter were 281.84 m2/g, 64.753 cm3/g, and 2.352 nm, respectively. The NDAC synthesized at 600 °C with a 21.12% nitrogen content was found to be the best one to remove AB14 dye from water and named as NDAC600. The impact of solution pH, initial concentration, and adsorption dosage on the adsorption of AB14 dye by NDAC600 was tested. The adsorption of AB14 dye by NDAC600 was found to be pH dependent, with the optimal elimination of being obtained at pH value 1.5 with a removal efficiency of 89.03%. The adsorption of AB14 dye is attributed to the electrostatic contact between the NDAC600 positively charged sites and the anionic AB14 dye. The AB14 dye adsorption was perfectly designated by using both pseudo-second-order (PSO) and Temkin adsorption kinetic models. The maximum adsorption capacity (Qm) was 909.09 mg/g; moreover, the adsorption process was monolayer sorption of AB14 dye to NDAC600. NDAC600 had proven itself as an effective, available, and green adsorbent for the adsorption of AB14 dye from water and may be applicable to other hazardous pollutants.

Advancement in Sustainable Wastewater Treatment: A Multifaceted Approach to Textile Dye Removal through Physical, Biological and Chemical Techniques

“…[61] As a result of their inexpensiveness, these materials can be disposed without requiring expensive regeneration. A broad array of activated carbons developed from agricultural waste products have been used for sequestration of dye effluents, including coconut shell for removal of methylene blue, [62] wheat straw as adsorbent for removal of cotton dyes, [63] rice straw biochar for the removal of phytochrome pigments, [64] removal of Acid Brown 14 from N-doped activated carbon prepared from sawdust/ZnCl 2 , [65] corn cob derived activated carbon for the removal of Congo red, [66] and activated carbon/Fe 3 O 4 nanocomposite developed from rice husks for the removal of Methylene Blue. [67] Low-cost high efficiency adsorbents is listed along with its removal efficiency in Table 2.…”

Equilibrium, kinetic and thermodynamic studies for the purification of wastewater from Congo red using simple and low cost adsorbents

“…Similar broad hump has also been detected in literature. [24] For surface area and pore parameters, Quantachrome, NOVA 1200e (USA) instrument was used to get N2 adsorption BET isotherms. Before measurements, the sample was initially degassed at 102°C for 3h.…”