Article
Engineering, Environmental
Sepideh Mansoori, Reza Davarnejad, Elnaz Jafari Ozumchelouei, Ahamd Fauzi Ismail
Summary: The FeCu/ABC catalyst showed excellent catalytic activity for CIP degradation, high stability, and structural integrity, achieving efficient degradation of CIP at natural pH.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Biochemistry & Molecular Biology
Youmei Zeng, Guangming Zhou, Dandan He, Guilong Peng
Summary: A magnetic copper ferrite and biochar composite catalyst (CuFe2O4@BC) was effectively used to remove the antibiotic ciprofloxacin (CIP) by activated peroxymonosulfate (PMS). The CuFe2O4@BC catalyst showed high stability, repeatability, and easy recovery with the assistance of an external magnetic field. The CuFe2O4@BC/PMS system exhibited good stability for metal ion leaching and generated various reactive radicals for CIP degradation, indicating its promising potential for CIP-contaminated water remediation.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Engineering, Chemical
Yi Ren, Chao Liu, Naiwen Li, Bo Lai, Jun Li
Summary: A new Fenton-like catalyst, FeCu/CN, was developed by incorporating iron and copper in polymeric graphitic carbon nitride (CN), which exhibited enhanced catalytic activity and reusability. The Fe7Cu3/CN catalyst system showed significantly higher pseudo-first-order rate constant for bisphenol S (BPS) degradation compared to monometallic catalyst systems. The new catalyst also demonstrated better performance for reuse, with BPS removal decreasing from 98.0% to 87.3% after five cycles. Hydroxyl radicals were identified as the main species for pollutant degradation, and the catalyst showed good performance for different pollutant removal and real wastewater treatment. This study provides a new catalyst with superior catalytic activity and favorable reusability, and contributes to the development of supported bimetallic catalysts.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Jian Chen, Jinbo Ouyang, Xionghui Cai, Xiaohong Xing, Limin Zhou, Zhirong Liu, Di Cai
Summary: This study prepared millimeter-sized sodium alginate/H3PO4 activated corncob-based biochar composite beads with excellent CIP sorption capacity, high tolerance to ionic strength, and favorable reusability. The beads exhibited advantages of biodegradability, economy, and efficient CIP capture performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Ting Zhang, Jingjing Zhang, Yinghao Yu, Jinxu Li, Zhifang Zhou, Chunlei Li
Summary: A new catalyst, CuO/GO-DE, was prepared using the ultrasonic impregnation method. The catalyst's structure and morphology were characterized, and its performance in degrading antibiotic wastewater was evaluated. The study also analyzed the main oxidizing substances and the synergistic catalytic oxidation mechanism under different pH conditions. Intermediate products of the degradation were identified, and a possible degradation process was proposed.
Article
Engineering, Environmental
Yuehao Shen, Yuxin Xiao, Hongjie Zhang, Hongjie Fan, Yao Li, Zhongli Yan, Wen-Hui Zhang
Summary: In this study, biochar-supported Fe-Cu bimetallic catalysts were synthesized and used to remove dye from wastewater generated by pulp and paper mills. The catalysts showed high efficiency in dye removal under both acidic and neutral conditions, and exhibited good magnetic separation ability and reusability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Beichen Zhao, Jilai Gong, Biao Song, Fan Sang, Chengyun Zhou, Chen Zhang, Weicheng Cao, Qiuya Niu, Zengping Chen
Summary: This study investigated the effects of different carbon materials on the pyrite-catalyzed Fenton oxidation of ciprofloxacin. The results showed that all three carbon materials accelerated the Fenton oxidation reaction. Activated carbon (AC) had a higher adsorption capacity for ciprofloxacin, which enhanced the pyrite-catalyzed Fenton oxidation. The addition of carbon materials promoted the production of hydroxyl radicals, favoring the degradation of ciprofloxacin.
Article
Engineering, Environmental
Minghe Cao, Meizhen Lu, Haojie Yin, Qinkai Zhu, Kainan Xing, Jianbing Ji
Summary: In this study, waste corncob with high hemicellulose content was used as a carbon source to investigate the impact of hemicellulose extraction on sulfonated biochar for biodiesel production. The optimized sulfonated biochar with a maximum-SO3H density of 2.05 mmol/g was synthesized through carbonization at 300 degrees C for 3 hours and sulfonation at 90 degrees C for 2 hours. The esterification reaction achieved a 98.5% oleic acid equilibrium conversion under optimized reaction parameters, with a molar ratio of 12:1 (methanol/oleic acid), a 10 wt% catalyst dosage, and a reaction temperature of 65 degrees C for 4 hours. The catalyst maintained a 70% conversion efficiency after 10 cycles, demonstrating the positive effects of hemicellulose extraction on biomass utilization and the improved catalyst lifetime for sustainable biodiesel production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Zhuoying Cheng, Shaopeng Li, Tat Thang Nguyen, Xing Gao, SuYue Luo, Minghui Guo
Summary: In order to reduce the adverse effects of dyes on the environment and health, a series of MnFe2O4-wood flour biochar (MFO-WFB) carbon materials were prepared for effective heterogeneous photo-Fenton degradation of Rhodamine B (RhB). The introduction of wood flour biochar increased the specific surface area and reduced the aggregation of magnetic nanoparticles, leading to enhanced catalytic activity of MFO-WFB for RhB degradation under optimal conditions of 0.6 g/L MFO-WFB-1.0, 115 mM H2O2, and pH = 4.8. Hydroxyl radicals and superoxide radicals were identified as the main active radicals for the catalyzed photo-Fenton degradation of RhB, and a possible mechanism was proposed based on radical capture experiments and electron spin resonance analysis.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Multidisciplinary
Hong Du, Xiuyun Ma, Miao Jiang, Siyuan Zhao, Qi Fang, Xiumei Liu, Zongchao Conrad Zhang
Summary: Highly efficient Cu-Ni/SiO2 catalysts have been developed for the production of xylitol. These bimetallic catalysts show higher activity compared to monometallic nickel or copper catalysts and the currently used Raney nickel catalyst. A higher ratio of nickel to copper in the bimetallic catalyst results in better performance, and activation at a low temperature enhances the catalysts' performances.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Golfo Papatheodorou, Paraskevi Ntzoufra, Evroula Hapeshi, John Vakros, Dionissios Mantzavinos
Summary: Biochar-ceria materials were synthesized using spent malt rootlets as the template. The materials showed high activity in the degradation of sulfamethoxazole when calcined at temperatures of 300-350 degrees C.
Article
Chemistry, Physical
Xin Nie, Guiying Li, Shanshan Li, Yingmei Luo, Wenming Luo, Quan Wan, Taicheng An
Summary: A novel hexapod-like pyrite nanosheets mineral cluster was prepared using a hydrothermal method, exhibiting high adsorption capacity and catalytic activity for ciprofloxacin degradation. The study identified inhibitory effects of certain ions on the degradation process and proposed a mechanism for the detoxification of toxic intermediates produced during the reaction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Chemical
Shuoyuan Tian, Yu Yin, Mengxuan Liu, Lei Shi, Shu Zhang, Abdul Hannan Asif, Xuan Li, Mengqiong Liu, Xiaoguang Duan, Shaobin Wang, Hongqi Sun
Summary: The discharge of difficult-to-degrade pharmaceuticals into water systems has had severe impacts on public health and ecosystems. Advanced oxidation processes (AOPs) have proven effective in removing these persistent pollutants, with single-atom catalysts (SACs) being the leading materials due to their highly exposed metal sites. In this study, hollow spherical graphitic carbon nitride (hsCN) incorporated with copper species was developed as a Fenton-like catalyst for the removal of acetaminophen (ACT). The SACu-hsCN material, with atomically dispersed Cu-N3 sites and a hollow structure, achieved the highest ACT removal efficiency of 94.8% within 180 minutes of Fenton-like reactions, surpassing the 56.7% removal efficiency of AGCu-hsCN with aggregated Cu particles. Furthermore, SACu-hsCN remained active even after four cycles of regeneration. Mechanistic investigations revealed that both hydroxyl radicals (•OH) and singlet oxygen (1O2) contributed to ACT degradation in the SACu-hsCN/H2O2 system, with non-radical 1O2 playing the dominant role.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Yanchao Jin, Peiwen Huang, Xiongjian Chen, Li-Ping Li, Chun-Yan Lin, Xiao Chen, Rui Ding, Jianxi Liu, Riyao Chen
Summary: In this study, antibiotic fermentation residue was converted into biochar and used as a heterogeneous electro-Fenton catalyst for ciprofloxacin degradation. The results showed that the biochar exhibited mesoporous structures and soft magnetic features, which enabled easy separation. The CIP degradation rate could be improved by increasing the working current and catalyst dosage within a certain range. The AFRB-EF process effectively degraded CIP and its toxicity was negligible even after multiple recycling.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Xiheng Kang, Zi You, Jian Peng, Arthur J. Ragauskas, Jingdong Pang, Peitao Zhao, Yongjun Yin, Xueping Song
Summary: This study developed a highly efficient Mg-K-biochar bimetallic catalyst for glucose isomerization, providing an efficient method for cellulose valorization. The MgO could give good catalytic effect on glucose isomerization, but the catalytic effect decreased when the Mg+ was overloaded. The synergy effects of MgO and K2CO3 could enhance the pH of the reaction system and effectively catalyze the isomerization of glucose.
