In this study, nano-Fe 3 O 4 supporting on granular activated carbon (NFGAC) were prepared, characterized and used as an individual additive to promote the anaerobic digestion of azo dye Reactive Red 2 (RR2) wastewater. Results showed that organics removal and methane production were effectively promoted with the addition of NFGAC. Compared with the control reactor, the RR2 removal efficiency increased by 117.9% and the methane production increased by 167.2% in the 0.18-NFGAC added reactor when sole RR2 used as the substrates. Further analysis indicated that during the RR2 anaerobic digestion process the electron transfer system (ETS) activity was effectively improved with the addition of NFGAC. One of the possible mechanism was that the loading nano-Fe 3 O 4 on the surface of GAC could increase the number of functional groups in NFGAC, which were beneficial to enhancing the electron accepting capacities (EAC) and electron donating capacities (EDC). Microbial community analysis showed that the bacteria ( Halomonas , Pseudomonas and Bacillus ) relevant to RR2 removal were enriched in NFGAC added reactors, which played an important role during RR2 removal process. In addition, the addition of NFGAC could promote potential direct interspecies electron transfer (DIET) between Pseudomonas and Methanosarcina.
Jinyu Wang,Xiangshun Li,Liming Wang,Xiaohong Qin,Yunhua Cui
The color of textiles plays a crucial role in meeting humans’ aesthetics needs and pleasure. Nanofiber has potential application prospects in textile and apparel due to its superior properties, such as the high specific surface area and porosity. Simultaneously, the coloring property has attracted widespread attention. However, the dyeing of polyacrylonitrile (PAN) nanofibers with reactive dyes remains a challenge due to the lack of reactive groups. Herein, an efficient strategy is proposed to successfully color electrospun PAN nanofibers with CI Reactive Red 2, enabled by introducing polyethyleneimine (PEI). Firstly, through entangling the molecular chain of PEI in solution, PAN is endowed with abundant cationic groups. Then, PAN/PEI nanofibers were obtained by electrospinning technology and further dyed using the reactive dye. More specifically, the different dyeing parameters, such as dyeing time, temperature, concentration and PEI concentration, were optimized. Compared to pure PAN nanofiber, PAN/PEI nanofiber achieved a higher dye uptake (96%) and better color fastness. This work offers an energy-saving and simple manner for improving the dyeing performance of PAN nanofibers using reactive dye.
Fan Zhang,Chuting Yang,Yi Li,Min Chen,Sheng Hu,Haiming Cheng
P,P-bis (2-oxooxazolidin-3-yl)-N-(3-(triethoxysilyl)propyl)phosphinic amide (APTES-BOP)-modified SBA-15 (SBA-15-BOP) was prepared by a post-synthesis grafting method for the removal of anionic azo dyes from aqueous solutions. The properties of the prepared adsorbent were characterized by PXRD, FT-IR, SEM, TEM, nitrogen sorption, and elemental analysis. Adsorption equilibrium and adsorption kinetic studies demonstrated that the experimental data fitted well with the Langmuir isotherm model and pseudo-second-order model. According to Langmuir fitting, SBA-15-BOP showed high adsorption capacity for CR and RR2 dyes, with the maximum adsorption capacities of 518.1 mg g−1 and 253.8 mg g−1, respectively. The thermodynamic study indicated that the adsorption processes of CR and RR2 dyes on SBA-15-BOP were spontaneous and exothermal. The prepared SBA-15-BOP can be a promising adsorbent for the removal of anionic dyes from aqueous solutions.
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