Application of cellulose sulfoacetate obtained from sugarcane bagasse as an additive in mortars

Abstract

In this study, cellulose sulfoacetate (CSA) was produced with cellulose extracted from sugarcane bagasse with sulfuric acid as a catalyst under homogenous conditions so that the derivative could be applied as an additive for mortar of Portland (Cimento Portland de alta resistência inicial, CPV-ARI) cement. The IR spectra showed that only precipitate C presented the characteristic band of sulfate groups (807 cm À1) and was, therefore, the sulfoacetylated derivative. CSA presented a degree of acetylation of 2.70 and a degree of sulfonation of 0.063, and the presence of sulfate groups in the derivative displaced the position of C(6) to a lower field in the 13 C-NMR spectrum and influenced reduced viscosity as a function of concentration. The evaluation of CSA as an additive showed that for a polymer/cement ratio of 0.6%, an increase of 13.80% was achieved consistently, and an increase of 21.05% in the potential tensile of adhesion strength was also achieved.

Polymeric polyelectrolytes obtained from renewable sources for biodiesel wastewater treatment by dual-flocculation

“…The band in the region 808 cm -1 refers to the presence of sulfates groups located at position 6 of the glycoside ring, besides being a characteristic of peak axial deformation of the S-O-C system [46]. The presence of sulfate groups favors the solubility in CAS water.…”

“…Both reactions were carried out simultaneously in the reaction medium of acetic acid, using acetic anhydride such as acetylating agent and sulfuric acid such as catalyst and sulfation agent, complying with the methodology described by Nascimento et al [46].…”

Mortar modified with sulfonated polystyrene produced from waste plastic cups

“…The construction processes related to this sector are responsible for a large proportion of urban pollution that affects the whole environment; however, this is also one of the sectors where part of the waste generated by social activities can be reused or incorporated in the construction process [6]. For example, research shows that sugarcane bagasse can be added in the production of cementitious composites, both in the form of fibers [7,8], ashes [9][10][11], and cellulose derivatives, such as cellulose sulfoacetate [12] and methylcellulose [13][14][15]. These additions are intended to improve both the physical and chemical properties of the composites, as well as reducing environmental pollution generated by waste.…”

Lignocelulósicos nos processos de purificação de biodiesel por via úmida utilizando floculantes de fontes renováveis e processo de separação com membranas de celulose regenerada

“…(Chauvelon et al, 2003). A incorporação dos grupos sulfato nas unidades glicosídicas pode ser comprovada no espectro pela presença de uma banda de éster sulfato em 1240 cm-1 atribuída a S=O e -COSO3 e pela presença de uma banda na região 810 cm-1, que indica que os grupos sulfatos estão localizados na posição 6 do anel glicosídico, além de ser um pico característico de deformação axial do sistema S-O-C (Thomas et al, 2003;Nascimento et al, 2012).…”