Methylene blue adsorption on graphene oxide/calcium alginate composites

Removal of methylene blue from water by cellulose/graphene oxide fibres

“…As the table shows, the MB adsorption capacity of CGO fibre is higher than carbon nanotube, [12] graphene, [13] magnetic CGO, [24] magnetic chitosan/graphene oxide, [33] and graphene oxide/calcium alginate. [23] Furthermore, the Langmuir isotherm model can be described by a separation factor, which is defined by the following equation [34]: where k L is the Langmuir constant (L/mg) and C 0 is the initial dye concentration (mg/L). Previous studies have shown that the adsorption is unfavourable ( Table 1 shows that the R L values are between 0 and 1, which indicate that the adsorption of MB onto the CGO fibres is a favourable process.…”

“…The abundant oxygen-containing groups from PVA and GO surface will both react via a dehydration reaction, and interact by hydrogen bonding as the hydrogel is forming. Similarly, our group in previous studies has prepared GO/chitosan fibres [22] and GO/calcium alginate fibres, [23] and investigated the adsorption properties for Congo red and methylene blue. From these experiments, we found that these GO-based materials have a good adsorption capacity, and can be easily separated.…”

Synthesis and characterization of hybrid composite aerogels from alginic acid and graphene oxide

“…Solid adsorbents are being used nowadays in numerous applications: adsorption of metal ions from solution [1], adsorption of dyes [2] [3], selective adsorption of gases from bulk gas [4] [5], and even as drug carrier systems [6] [7], among several others. They are also being eyed as a potential instrument in wastewater treatment [8].…”

Hybrid Monolith of Graphene/TEMPO-Oxidized Cellulose Nanofiber as Mechanically Robust, Highly Functional, and Recyclable Adsorbent of Methylene Blue Dye

“…However, higher content of CNFs showed little improvement in dye adsorption capacity and specific surface area, which could be explained as follows: higher incorporation of CNFs leads to aggregation into pore orifice thus reducing the full surface area coverage of hybrid monolith for dye molecules. Based on Table S4, candidate hybrid adsorbent showed notable adsorption performance compared with other reported work such as high cost carbon nanotube (CNT) [13], graphene/CNT monolith [33], MWCNT aerogel [51], graphene by toxic hydrazine [27], graphene/luffa sponge [12], thiourea assisted graphene sponge [31], polydopamine microspheres [23], polyaniline hydrogel [26], magnetic particle based graphene composite [9,19,[34][35][36][37][38], graphene coated biochar [40], and graphene oxide/calcium alginate [14]; for more comparison see Table S4.…”

“…Among the various treatment techniques such as biological treatment [4], ozone oxidation [4], catalytic degradation [5], photocatalytic oxidation [6], coagulation and flocculation [3], nanofiltration membrane [7], and unsaturated polyester resins [8], adsorption is the most attractive due to competency for variety of organic dyes, insensitivity to toxic pollutants [9], efficiency for low concentration range [10], easiness of operating, and being economical process [9,[11][12][13][14][15][16][17][18][19][20][21]. Carbon materials in the form of activated carbon are historically dominant for dye decontamination in view of chemical stability, high surface area, and functional active sites [16,20,[22][23][24][25][26].…”