甲醛
吸附
生物修复
恶臭假单胞菌
生物降解
蒙脱石
化学
化学工程
复合数
朗缪尔吸附模型
降级(电信)
环境修复
材料科学
细菌
有机化学
污染
复合材料
酶
遗传学
计算机科学
工程类
生态学
生物
电信
作者
Yael Zvulunov,Zohar Ben-Barak-Zelas,Ayelet Fishman,Adi Radian
标识
DOI:10.1016/j.cej.2019.06.017
摘要
A multi-functional, self-regenerating material was designed to adsorb and biodegrade formaldehyde from water in a simple, one-step process. The material is based on montmorillonite clay, polyethyleneimine and formaldehyde-degrading Pseudomonas putida, and has three unique functions which facilitate bioremediation: a. selectively adsorbs formaldehyde to reduce cytotoxicity, b. buffers the solution to allow efficient biodegradation, and c. self-cleans through slow release of formaldehyde and subsequent degradation by the attached bacteria, allowing regeneration and long-term use of the material. A polyethyleneimine-clay composite was optimized to carry positive surface charges and a high concentration of functional amine groups, which facilitated formaldehyde adsorption and bacterial adhesion. Formaldehyde binding was specific, yet reversible and pH dependent; binding fitted the Langmuir model and had a qmax of 62 mg·g−1 composite. A formaldehyde-degrading Pseudomonas putida strain was then immobilized on the positively charged composite through electrostatic interactions. The efficiency of the resulting bio-composite was demonstrated for multiple successive treatment cycles, with degradation rates as high as 1600 mg·L−1·FA·h−1. This self-regenerating one-step process is a promising solution to the challenging drawbacks of formaldehyde remediation and could also help design other adsorption-degradation platforms for wastewaters that demand complicated treatment strategies.
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