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Water contamination by aquatic pollutants (antibiotics, heavy metals, nutrients, and organic pollutants) has become the most serious issue of recent times due to associated human health risks. Biochar (BC) has been deemed an effective and promising green material for the remediation of a wide range of environmental pollutants. Due to its limited properties (small pore size and low surface functionality), pristine BC has encountered bottlenecks in decontamination applications. These limitations can be rectified by modifying the pristine BC into engineered BC via multiple modification methods (physical, chemical, and mechanical), thus improving its decontamination functionalities. Recently, these engineered BCs/BC-based composites or BC composites have gathered pronounced attention for water decontamination due to fewer chemical requirements, high energy efficiency, and pollutant removal capacity. BC-based composites are synthesized by mixing BC with various modifiers, including carbonaceous material, clay minerals, metals, and metal oxides. They considerably modify the physiochemical attributes of BC and increase its adsorption ability against various types of aquatic pollutants. BC-based composites are efficient in eliminating target pollutants. The efficiency and type of a specific mechanism depend on various factors, mainly on the physicochemical characteristics and composition of the BC-based composites and the target pollutants. Among the different engineered BCs, the efficiency of clay-BC composites in removing the antibiotics, dyes, metals, and nutrients was good. This review could help develop a comprehensive understanding of using engineered BCs as effective materials for the remediation of contaminated water. Finally, gaps and challenges in research are identified, and future research needs are proposed.

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Background: Dengue fever is a vector-borne infectious tropical disease caused by the dengue virus, the most common arthropod-borne infection in humans. According to WHO, the best strategy to avoid dengue endemic is to educate people about the disease and preventative measures? Despite the efforts to avoid the dengue virus, the newest national survey statistics show that dengue fever is still on the increase among the population. The major goal of this study was to examine university students' knowledge of dengue and preventative measures, as well as to determine the relationship between awareness of dengue and drivers of knowledge of dengue infection in Government College University Faisalabad students. Aim: The aim of this review is to highlight Dengue fever (break-borne fever). Materials and methods: This was a survey review article. This research work was conducted at Government College University, Faisalabad. And this research work was conducted in three months (Between February 2020 and April 2020). A cross-sectional study investigation was carried out. A total of 500 students were interviewed, with pre-tested questioners being used. Results: A cross-sectional investigation was carried out. A total of 500 students were interviewed, with pre-tested questioners being used. The sampling was done in a convenient manner. In Government College University Faisalabad, several medical terminologies were put in plain English, and interviewers were trained for data collecting. The research was carried out at Government College University in Faisalabad. The course of study was also thought to have an influence on Dengue fever knowledge. SPSS was used to examine the findings of this investigation. The total score range was 25. The participants (26.4%) showed scores from a range of 10 or below 10 which means they had poor knowledge about dengue awareness. While the participants (45.4%) showed scores from a range of 11 to 18 which means they had fair knowledge about dengue awareness. The participants (28.2%) s showed scores ranging from 19 to 25 which means they had good knowledge about dengue fever awareness. Conclusion: Of this study is that knowledge is poor between the study respondents while the majority of persons had clear understanding of fever, headache, joint pain as general signs and symptoms of dengue viral fever. However, a huge proportion exhibited vague opinions of other different signs and symptoms involving muscular pain and skin rashes. Only rare of them knew that dengue viral fever is caused by mosquito bites, and was conscious that the mosquito causing dengue breeds in artificially collected water.