Porous carbon prepared from lotus leaves as potential adsorbent for efficient removal of rhodamine B

Abstract

Lotus leaf porous carbon (LLPC) prepared from waste lotus leaves has a large specific surface area (2440 m 2 g −1 ), and is used for the adsorption of rhodamine B (RhB) from wastewater in this study. The effects of different parameters such as LLPC dose, initial pH of wastewater, adsorption time, initial RhB concentration, and temperature on adsorption have been systematically explored. Notably, 100% removal efficiency of RhB (60 ppm) is obtained at a low LLPC concentration of 0.125 g l −1 . The adsorption equilibrium with a maximum theoretical adsorption capacity of 718.9 mg g −1 at 313 K is described by the Langmuir isotherm. The results for removal efficiency as a function of time are consistent with the pseudo second-order kinetic model and the adsorption process is dominated by chemisorption. Thermodynamic studies confirm that RhB absorption by LLPC is spontaneous at 313 K. The experiments conducted to determine the adsorption mechanism show that intraparticle diffusion is not the only rate-limiting step during adsorption, and the boundary effect becomes more dominant with an increase in adsorption time. The excellent RhB adsorption performance of LLPC and adsorption mechanism afford novel insights into this process for the application of biomass materials in wastewater treatment.

One-pot fabrication of magnetic biochar by FeCl3-activation of lotus seedpod and its catalytic activity towards degradation of Orange G

“…Lotus (Nelumbo nucifera) is an aquatic herbaceous perennial plant, which is popular in such Asian countries as China, India, Thailand, Japan, Korea, and Vietnam [23,24]. Almost all parts of lotus, like buds, flowers, anthers, stamens, leaves, stalks, rhizomes, roots, and seeds are useful [25].…”

The Influence of Oxidation and Nitrogenation on the Physicochemical Properties and Sorption Capacity of Activated Biocarbons Prepared from the Elderberry Inflorescence

“…The situation was similar in the case of the rhodamine B removal from aqueous solution. For example, the adsorption capacity of the COX sample was higher than for lignocellulose [ 55 ] and wood biomass-based activated carbons [ 56 ]; however, it was significantly lower than for the activated carbons prepared by activation of rice straw [ 57 ], bagasse pith [ 58 ] and especially lotus leaves [ 59 ].…”

“…Biochar from soybean dreg 1274 [49] Activated carbon from bagasse and cluster stalks 714-847 [50] Hydrochar from coffee husks 418 [51] Activated carbons from safflower seed 128 [52] Activated carbon from rice straw 109 [53] Commercial activated carbon from peat 161 [54] COX 279 This study Rhodamine B Activated carbon from lignocellulosic waste 33 [55] Activated carbon from wood biomass 77 [56] Activated carbon from rice husk 181 [57] Activated carbon from bagasse pith 199 [58] Activated carbon from lotus leaves 701 [59] COX 96 This study…”