title: Polypyrrole-Grafted Coconut Shell Biological Carbon as a Potential Adsorbent for Methyl Tert-Butyl Ether Removal: Characterization and Adsorption Capability.
abstract: Methyltert-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 aeruginosaandAcinetobacter pittiimay be the predominant bacteria responsible for MTBE degradation in these biofilm reactors.
authors.affiliation: Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China. shanshan0320@xjtu.edu.cn.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Li
authors.affiliation: Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China. 15637390053@163.com.
authors.forename: Keke
authors.initials: K
authors.lastname: Qian
authors.affiliation: Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China. wangshanw@stu.xjtu.edu.cn.
authors.forename: Shan
authors.initials: S
authors.lastname: Wang
authors.affiliation: Research Institute of Yanchang Petroleum (GROUP) Co. Ltd., Xi'an 710075, China. lkq886@163.com.
authors.forename: Kaiqiang
authors.initials: K
authors.lastname: Liang
authors.affiliation: Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China. yanwei@xjtu.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Yan
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D003059:Cocos / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D011108:Polymers; D011758:Pyrroles; D014874:Water Pollutants, Chemical; C067635:polypyrrole; D002244:Carbon
keywords: PPy/GAC; active carbon; biological filtration; carrier; methyl tert-butyl ether; polypyrrole