Polypyrrole-Grafted Coconut Shell Biological Carbon as a Potential Adsorbent for Methyl Tert-Butyl Ether Removal: Characterization and Adsorption Capability

Abstract

Methyl tert-butyl ether (MTBE) has been used as a common gasoline additive worldwide since the late twentieth century, and it has become the most frequently detected groundwater pollutant in many countries. This study aimed to synthesize a novel microbial carrier to improve its adsorptive capacity for MTBE and biofilm formation, compared to the traditional granular activated carbon (GAC). A polypyrrole (PPy)-modified GAC composite (PPy/GAC) was synthesized, and characterized by Fourier transform infrared spectroscopy (FT-IR) and Brunauer-Emmett-Teller (BET) surface area analysis. The adsorption behaviors of MTBE were well described by the pseudo-second-order and Langmuir isotherm models. Furthermore, three biofilm reactors were established with PPy/GAC, PPy, and GAC as the carriers, respectively, and the degradation of MTBE under continuous flow was investigated. Compared to the biofilm reactors with PPy or GAC (which both broke after a period of operation), the PPy/GAC biofilm column produced stable effluents under variable treatment conditions with a long-term effluent MTBE concentration <20 μg/L. Pseudomonas aeruginosa and Acinetobacter pittii may be the predominant bacteria responsible for MTBE degradation in these biofilm reactors.

Removal Behavior of Methylene Blue from Aqueous Solution by Tea Waste: Kinetics, Isotherms and Mechanism

“…Generally, when 1/ n is less than 0.5, the adsorption process would be easily carried out. Adsorption process is difficult when the 1/ n is larger than 0.5 [ 4 , 5 ]. In this research, the 1/ n is less than 0.5 when MB was adsorbed onto tea waste, suggesting that adsorption behavior of methylene blue on tea waste easily performed.…”

“…The Temkin isotherm model assumes that the heat of adsorption of all the molecules in the layer decreases linearly with coverage due to adsorbent–adsorbate interactions and mainly describes the chemisoprtion process which dominated through electrostatic adsorption [ 4 , 5 ]. In this investigation, the correlation coefficient of Temkin model was larger than 0.95, revealing that electrostatic interaction was an important mechanism between tea waste and methylene blue.…”

“…The priority research focuses on the choice of the adsorbent and the investigation of mechanism. Biomass is an ideal material for adsorbent owing to its wide availability and low cost, especially biomass based on agricultural and forestry residues [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ].…”

Hydrocarbonoclastic activity in bacterial biofilms: A systematic study emphasizing pseudomonads

“…After applying the exclusion criteria, identifying duplicates and articles dealing with bioremediation, 11 documents remained, of which only five addressed investigations involving pseudomonad biofilms in the process. Pseudomonas aeruginosa was cited in only three of them, as an axenic culture (PATHAK et al, 2017) or mixed with consortia (LI et al, 2017;Al-MAILEM et al, 2014). The other two works identified Pseudomonas ssp.…”

Design and Preparation of Lotus Root Knot Hierarchical Porous Carbon by Highly Efficient Chemistry Activation for Electric Double Layer Capacitors

“…[30] N-abundant biomass essentially solves the problem of the source of heteroatom N in the doping effect, and it is more economical and environmentally friendly than the method of doping N-containing molecules (melamine, pyrrole) in the carbonization process. [31] In this paper, hierarchical porous carbon with nitrogen and oxygen co-doping was prepared from lotus root knots as biomass raw material and made into electrodes for super capacitors by simple carbonization and continuous activation, making full use of its own advantages. As biomass itself is also a food residue, it has low price and renewable property beneficial to environmental resources.…”