Biosorption of Congo Red from Aqueous Solutions Based on Self-Immobilized Mycelial Pellets: Kinetics, Isotherms, and Thermodynamic Studies

Abstract

In the current study, Aspergillus fumigatus and Pseudomonas putida were co-cultured to obtain self-immobilized mycelial pellets to evaluate the decolorization efficiency of Congo red (CR). The obtained co-culture exhibited the highest decolorization efficiency of 99.22% compared to monoculture of A. fumigatus (89.20%) and P. putida (55.04%). The morphology and surface properties of the mycelial pellets were characterized by SEM, FTIR, BET, and XPS. The adsorption kinetics and isotherms were well described by pseudo-second-order and Langmuir models. The findings revealed that the removal efficiency of the mycelial pellet for CR was significantly influenced by physicochemical parameters. Thermodynamic result showed that the biosorption process was endothermic. The maximum adsorption capacity can be obtained from the Langmuir model, which is 316.46 mg/g, it suggests that mycelial pellet was an efficient biosorbent to remove CR from aqueous solution. This study indicates that the mycelial pellet can develop a sustainable approach to eliminate CR from the wastewater.

Kinetics and Thermodynamics of Acid Red 1 Adsorption on Used Black Tea Leaves from Aqueous Solution

“…On the other hand, the positive value of ∆S ads confirms the increasing randomness at the solid/solution interface during the adsorption. All the findings of thermodynamic parameters are in agreement with earlier research findings [27,[36][37][38].…”

Diverse Dyes-Embedded Staphylococcus aureus as Potential Biocarriers for Enhancing Sensitivity in Biosensing

“…Among them, the hydroxyl groups on the cell surface can interact with CR through hydrogen bonding . (2) The SO 3 – group of CR can be combined with proteins in bacteria through amine groups …”

“…33 (2) The SO 3 − group of CR can be combined with proteins in bacteria through amine groups. 34 The preparation of SAD−mAb was based on that protein A expressed on the surface of SA can specifically bind to the Fc region of mAbs through the consensus sequence (Asn-Gln-Phe-Asn-Lys-Glu). 27 Briefly, the SAD and mAbs were incubated for a period of time, and then the unbound sites of the SAD were blocked by BSA, avoiding the utilization of other common modifications.…”

Removal of the Basic and Diazo Dyes from Aqueous Solution by the Frustules of Halamphora cf. salinicola (Bacillariophyta)

“…salinicola showed a good adsorption ability. Removal of the diazo dye CR by the diatom frustules (74.9%) was comparable to activated carbon: 87.5% removal of 200 mg L −1 [ 48 ], as well as biosorbents; the microalgal waste showed 76.6% of removal of 50 mg L −1 after 120 min [ 57 ], pretreated Scenedesmus obliquus removed 41.15% of 20 mg L −1 CR [ 104 ], 87.66% removal of 20 mg L −1 for Sargassum latifolium waste [ 105 ], up to 88.7% of 100 mg L −1 CR removal by Moringa seed waste [ 66 ], 89.20% 55.04% of 100 mg L −1 CR for Aspergillus fumigatus and Pseudomonas putida mycelial pallets, respectively [ 106 ], and 15% and 98% removal of 50 mg L −1 for the unmodified and the modified diatomaceous earth, respectively [ 107 ]. At the same time, the maximum adsorption capacity of the frustules (q max = 13.04 mg g −1 ) was lower than other sorbents: 493.8 mg g −1 for activated carbon [ 48 ], 316.46 mg g −1 for mycelial pellets [ 106 ], 202.9 mg g −1 for the Chlorella vulgaris biomass [ 108 ], 20.97 mg g −1 for Sargassum latifolium waste [ 105 ], 170.7 mg g −1 for Moringa seed waste [ 66 ], 55.5 mg g −1 for natural perlite [ 109 ], and 23.2 mg g −1 and 305.8 mg g −1 for the unmodified and the modified diatomaceous earth, respectively [ 107 ].…”