SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Yajie Qian,Jing Zhang,Yalei Zhang,Jiabin Chen,Xuefei Zhou
In this study, a newly emerging oxidant nanoscale calcium peroxide (nCaO 2 ) was synthesized to degrade 2,4-dichlorophenol (2,4-DCP). nCaO 2 was prepared from nanoscale Ca(OH) 2 and H 2 O 2 and confirmed to be less than 150 nm in diameter and 62.23 m 2 · g −1 in specific surface area (SSA). For treating 2,4-DCP, the optimal ratio between Ca(OH) 2 and H 2 O 2 was 1:5. Compared with conventional CaO 2 , nCaO 2 was found to be more efficient for destructing 2,4-DCP. 2,4-DCP was completely degraded in 5 d by nCaO 2 while only 75.0% 2,4-DCP was destructed by conventional CaO 2 . The effects of solution pH and water matrix, including SO 4 2− , HCO 3 − and humic acid (HA) were examined. The reactive species in nCaO 2 system was investigated by photoluminescence (PL) technique and the quenching experiments. Results showed that hydroxyl radical (OH ) was the dominant reactive species for destructing 2,4-DCP. The major oxidation products identified in this study were 2-chlorophenol (2-CP), 4-chlorophenol (4-CP), phenol and benzoquinone (BQ). Our works gave an important insight into the use of nCaO 2 to degrade some organic contaminants which might provide some references for the application of nCaO 2 in chlorophenols contaminated groundwater remediation.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Caizhi Lv,Pengchong Jiao,Hui Xin,Lan Wu,Gangfeng Ouyang,Xiandeng Hou
Insulator hydroxyapatite (HAp) was chosen as a candidate to construct full-spectrum photocatalyst. Glucose as a functional precursor was incorporated into HAp by coprecipitated method, and the glucose-modified HAp was then calcined under nitrogen atmosphere. With the loss of OH - group in HAp and the decomposition of glucose during the calcination, oxygen vacancies (OVs) for regulating the band gap, graphitic carbon (GC) as a good electron acceptor, and a channel for rapid carrier separation via the C-O-Ca forming between OV-HAp and GC can be simultaneously achieved. The as-prepared OV-HAp/GC displayed full-spectrum response and rapid separation of carriers. Moreover, it showed high degradation performance for 2, 4-dichlorophenol (2, 4-DCP), phenol, and tetracycline under visible, NIR, and full-spectrum. This strategy is not only facile, but also exhibits a certain universality. This work opens a new window for full-spectrum photocatalysts construction based on insulators, and large-scale production for practical use can be expected.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 155
·期 1
·1-15
·
IF 2.3
Gao Qing,Yu Yingxue,Wang Chengyun,Xiang Rui,Lu Hao
Designing an efficient Pd-based catalyst with high atom utilization efficiency is a pressing priority, presenting a significant challenge for the practical deployment of electrocatalytic hydrodechlorination (EHDC), a promising method for degrading hazardous chlorophenols (CPs). Herein, a hybrid Pd/Co(OH) 2 /NF electrode for the dechlorination of 2,4- dichlorophenol (2,4-DCP) is fabricated by a newly developed etching-deposition approach. Physical characterizations demonstrate that ultra-fine Pd nanoparticles (1.57 ± 0.29 nm) accompany with Pd 2+ hydroxides are uniformly deposited on the surface of Co(OH) 2 nanowire arrays. EHDC tests on Pd/Co(OH) 2 /NF show an impressive catalytic performance with a 94.5% removal efficiency within 2 h, fast reaction kinetics (0.024 min − 1 ) and remarkable current efficiency (55.4%), highly competitive with literature reports. Mechanism investigations indicate that the even distribution of Pd nanoparticles and coexistence of Pd 2+ sites facilitate the production of active H * and activation of C-Cl, contributing to the improvement of activity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 6
·2569
·
IF 4.6
Yu Liang,Xinyan Chen,Jianli Zeng,Junqing Ye,Bin He,Wenjin Li,Jian Sun
Laccase immobilization is a promising method that can be used for the recyclable treatment of refractory phenolic pollutants (e.g., chlorophenols) under mild conditions, but the method is still hindered by the trade-off limits of supports in terms of their high specific surface area and rich functional groups. Herein, confined polymerization was applied to create abundant amino-functionalized polymeric ionic liquids (PILs) featuring a highly specific surface area and mesoporous structure for chemically immobilizing laccase. Benefiting from this strategy, the specific surface area of the as-synthesized PILs was significantly increased by 60-fold, from 5 to 302 m2/g. Further, a maximum activity recovery of 82% towards laccase was recorded. The tolerance and circulation of the immobilized laccase under harsh operating conditions were significantly improved, and the immobilized laccase retained more than 84% of its initial activity after 15 days. After 10 cycles, the immobilized laccase was still able to maintain 80% of its activity. Compared with the free laccase, the immobilized laccase exhibited enhanced stability in the biodegradation of 2,4-dichlorophenol (2,4-DCP), recording around 80% (seven cycles) efficiency. It is proposed that the synergistic effect between PILs and laccase plays an important role in the enhancement of stability and activity in phenolic pollutant degradation. This work provides a strategy for the development of synthetic methods for PILs and the improvement of immobilized laccase stability.Keywords:polymeric ionic liquids;confined polymerization;laccase;immobilization;2,4-DCP;removal
研究领域:
环境生物学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Ping Yu,Qilong Sun,Jianfeng Li,Jianming Pan,Zhenjiang Tan,Yongsheng Yan
Poly(styrene-divinyl benzene) (St-DVB) magnetic porous microspheres were prepared by sulfonation for the adsorption of 2,4-dichlorophenol(2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) from aqueous solution. The as-prepared microspheres were characterized by FT-IR, XRD, SEM, TGA, VSM, and N2 adsorption–desorption techniques, showing that the as-prepared microspheres were porous and had good magnetism (Ms = 40 emu g−1). The adsorption performance of St-DVB magnetic porous microspheres were investigated by batch mode adsorption experiments with respect to pH, temperature, initial concentration, and contact time. The St-DVB magnetic porous microspheres were sensitive to pH. The equilibrium data was better fitted to the Langmuir isotherm model than the Freundlich model. The kinetics experimental data was well fitted to the pseudo-second-order model. The thermodynamic parameters were calculated by the Gibbs free energy function, revealing that the adsorption process was spontaneous and endothermic. Furthermore, the St-DVB magnetic porous microspheres had good recycling performance.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Guomin Geng,Mengyang Cai,Rui Fang,Qian Luan,Zhiqiang Zhang,Jianjun Song,Jian Zhang
Developing highly efficient and stable catalysts toward advanced oxidation technology is the key to achieve industrial peroxymonosulfate (PMS) activation for pollution degradation. Perovskite-type oxide catalysts show high activity and stability for PMS activation, yet the small specific surface area of perovskite catalysts limits the increase of catalytic performance. Metal-organic frameworks (MOFs) have been widely used as the templates/precursors to prepare high specific surface area nanomaterials. In this study, two kinds of high surface area perovskites LaCoO 3 and LaMnO 3 were firstly fabricated with MOFs as templates. Benefiting from the extraordinary skeleton structure of MOFs, well-defined architecture and porous perovskite catalysts show superior catalytic performance towards PMS activation for the degradation of 2, 4-dichlorophenol (2, 4-DCP), with a 99.8% degradation of 2, 4-DCP in 25 min for LaCoO 3 catalyst. Moreover, the LaCoO 3 catalysts exhibit long-term stability with a slight loss of catalytic activity during 3 times recycled experiments. This study not only developed high activity catalysts for PMS activation, but also expanded the MOFs applications for environment and energy.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）