In recent years, the use of magnetic biochar in wastewater treatment has shown significant effects and attracted scholars’ attention. However, due to the relatively short research time and the lack of systematic summaries, it is difficult to provide a more in-depth analysis. This study utilizes RStudio and CiteSpace software to comprehensively analyze the research trends and progress of magnetic biochar in wastewater treatment. The analysis of bibliometrics is performed on 551 relevant papers retrieved from the Web of Science, spanning the period between 2011 and 2022. The most influential countries, institutions, journals, disciplinary distribution, and top 10 authors and papers in this field have been identified. The latest dataset has been used for keyword clustering and burst analysis. The results indicated that: (1) Bin Gao is the most influential author in this field, and high-level journals such as Bioresource Technology are more inclined to publish articles in the field of magnetic biochar. (2) Research in this field has predominantly focused on the removal of heavy metals and organic compounds. Keyword burst analysis shows a shift in research direction towards the removal of complex organic pollutants recently. (3) For the future development of magnetic biochar, an environment-friendly approach, economic viability, and joint technology are the directions that need more exploration. Finally, this paper provides a summary of the various adsorption mechanisms of magnetic biochar and several common modification methods, aiming to assist scholars in their research endeavors.

In recent years, bismuth tungstate (Bi₂WO₆) has been widely researched in the photocatalytic area due to its unique crystal structure and suitable bandgap. In this study, a comprehensive summary of Bi₂WO₆-based photocatalyst research from 2007 to 2022 was provided using bibliometric analysis. The study was conducted based on the Web of Science Core Collection Database and a dataset of 2064 publications retrieved. The bibliometix R-package and CiteSpace software were used for bibliometric analysis and science mapping. The network of the relationships among countries, journals, organizations, authors, and keywords related to investigated topic and subtopics were analyzed and discussed. Results showed that China has been playing an important role in this research area and also has a close cooperative relationship with other countries. Highly-cited emergent words indicated that improving the photocatalytic performance of Bi₂WO₆-based nanomaterials is the main research topic. In addition, the synergistic effects of photocatalysis and adsorption have also become a research hotspot for improving catalytic efficiency. The results will provide a reference for researchers for gaining a deeper understanding of Bi₂WO₆-based photocatalysts.