10 documents found, page 1 of 1
An innovative approach to develop microporous activated carbons in oxidising at...
Suhas; Carrott, P. J. M.; Ribeiro Carrott, M. M. L.; Singh, R.; Singh, L. P.; Choudhary, M.The aim of the study was to investigate a rather oxidising atmosphere such as air for the development of a microporous activated carbon from demineralised kraft lignin. Demineralisation of lignin makes the precursor low in reactivity and hence can allow the use of more oxidising atmospheres. Control of the activation conditions allowed development of microporous activated carbons with type I N2 adsorption isoth...
An innovative approach to develop microporous activated carbons in oxidising at...
Suhas; Carrott, P. J. M.; Ribeiro Carrott, M. M. L.; Singh, R.; Singh, L. P.; Chaudhary, M.The aim of the study was to investigate a rather oxidising atmosphere such as air for the development of a microporous activated carbon from demineralised kraft lignin. Demineralisation of lignin makes the precursor low in reactivity and hence can allow the use of more oxidising atmospheres. Control of the activation conditions allowed development of microporous activated carbons with type I N2 adsorption isoth...
Cellulose: A review as natural, modified and activated carbon adsorbent
Suhas; Gupta, V. K.; Carrott, P. J. M.; Singh, R.; Chaudhary, M.; Kushwaha, S.Cellulose is a biodegradable, renewable, non-meltable polymer which is insoluble in most solvents due to hydrogen bonding and crystallinity. Natural cellulose shows lower adsorption capacity as compared to modified cellulose and its capacity can be enhanced by modification usually by chemicals. This review focuses on the utilization of cellulose as an adsorbent in natural/modified form or as a precursor for act...
Cellulose: A review as natural, modified and activated carbon adsorbent
Suhas; Gupta, V. K.; Carrott, P. J. M.; Singh, R.; Chaudhary, M.; Kushwaha, S.Cellulose is a biodegradable, renewable, non-meltable polymer which is insoluble in most solvents due to hydrogen bonding and crystallinity. Natural cellulose shows lower adsorption capacity as compared to modified cellulose and its capacity can be enhanced by modification usually by chemicals. This review focuses on the utilization of cellulose as an adsorbent in natural/modified form or as a precursor for act...
Comparison of the Dubinin-Radushkevich and Quenched Solid Density Functional Th...
P.J.M. Carrott; M.M.L. Ribeiro Carrott; SuhasThe classical DR method and the Quenched Solid Density Functional Theory (QSDFT) approach have been used to analyse N2 at 77 K isotherms determined on activated carbons prepared by alkaline chemical activation of different lignins. The QSDFT pore size distributions are bimodal with a narrow peak below 1 nm and a broad peak from 1 to 2.5–3.5 nm. Deconvolution allows estimation of the volumes and widths of the na...
Low-Cost Adsorbents: Growing Approach to Wastewater Treatment—a Review
Gupta, VK; Carrott, PJM; Ribeiro Carrott, MML; SuhasIndustrial, agricultural, and domestic activities of humans have affected the environmental system, resulting in drastic problems such as global warming and the generation of wastewater containing high levels of pollutants. As water of good quality is a precious commodity and available in limited amounts, it has become highly imperative to treat wastewater for removal of pollutants. In addition, the rapid moder...
Using alkali metals to control reactivity and porosity during physical activati...
Suhas; Carrott, PJM; Ribeiro Carrott, MMLDemineralised kraft lignin was impregnated with between 6.2% and 50% NaCl or KCl and physically activated in CO2 at 750 C. The results presented show that a considerable reduction in activation time even at a comparatively low activation temperature could be achieved, particularly when using KCl. Considering a fixed level of burn-off, the impregnation did not affect the pore volume and only increased the pore w...
Reactivity of Cork and Lignin for the Production of Activated Carbons
Carrott, Peter; Ribeiro Carrott, Manuela; Suhas; Mourão, Paulo; Guerrero, Clara; Delgado, LuísaUm artigo do Grupo de Química de Superfícies e Materiais
Lignin - From natural adsorbent to activated carbon: A review
Suhas; Carrott, Peter; Ribeiro Carrott, ManuelaThe present review compiles the work done over the last few decades on the use of lignin and lignin-based chars and activated carbons as adsorbents for the removal of substances from water and focuses on the utilisation of lignin as adsorbent, its conversion to chars and activated carbons and the use of these materials as adsorbents. Moreover, the review also examines the textural and surface chemical propertie...
Reactivity and Porosity Development during Pyrolysis and Physical Activation in...
Carrott, Peter; Suhas; Ribeiro Carrott, Manuela; Guerrero, Clara; Delgado, LuísaUm artigo do Grupo de Química de Superfícies e Materiais