Qingpeng Zhu,Jiaojiao Song,Zhaofei Liu,Konglin Wu,Xiangzi Li,Zhiming Chen,Huan Pang
Efficient and convenient degradation of industrial organic pollutants are of great importance for green chemical schemes and cost-effectiveness. This work introduced the immobilization of laccase on Fe 3 O 4 @SiO 2 nanoparticles (Fe 3 O 4 @SiO 2 -laccase) for photothermal catalytic degradation of textile dyes. The Fe 3 O 4 @SiO 2 -laccase presented excellent reusability, improved thermal and pH stabilities, and remarkable organic compounds, inhibitors and metal ions tolerance. Batch experiments indicate that the maximum loading amount and activity recovery for laccase were about 10.5 mg/g and 109.7%, respectively. Meanwhile, the immobilized laccase was employed for photothermal catalytic degradation of textile dyes. The degradation assays revealed that the initial removal efficiencies were 99.6%, 99.5%, 94.6%, 94.2%, 89.4% and 79.3% for high concentrations of malachite green (MG), brilliant green (BG), reactive blue 19 (RB19), azophloxine, procion red MX-5B and alizarin red in 30–60 min illumination, respectively. Even after 10 recycling cycles, the photothermal catalytic degradation rates of the textile dyes were observed at 98.7%, 99.3%, 88.8%, 79.0%, 78.7% and 64.4%, respectively. The outstanding photothermal catalytic performances demonstrated that the Fe 3 O 4 @SiO 2 -laccase has a technical application in wastewater treatment .
The development of novel technologies for wastewater treatment provides a reliable pathway to solve the growing environmental issues. Control on process cost, increment of pollutant removal efficiency, and multi-system applicability are key points which should be carefully considered. Here in this work, a novel method of ‘water splitting coagulation (WSC)’, which involves the synchronous treatment of two kinds of wastewater that contain metal and organic contaminants was proposed. As an electrical based technique, WSC utilizes ‘water splitting’ in a bipolar membrane (BM) instead of ‘water electrolysis’ on electrodes to constructively produce a flocculating constituent ( Ni ( O H ) x ( 2 - x ) + ) by controlling the ‘hydroxide delivery’ and ‘cation delivery’ inside a BM and across a cation exchange membrane. The metal hydroxide is capable of absorbing textile dyes in ( D y e ) y N i ( O H ) x ( 2 - x ) + form, which can be post-treated to produce useful resources. The alternative process has several advantages: 1) prevents the replacement of sacrificial anodes, 2) simultaneous removal of heavy metal and textile dyes, and 3) the recycling of valuable accompanying byproducts, and has great potential in the complex industrial wastewater treatment.
危险品化学品经营许可证（带存储）