Dyes are stable organic pollutants that have been used in many industries and become one of the toxic contaminants for the environment. This research aimed at preparing a magnetic chitosan nanocomposite (MCN) as an effective adsorbent for cationic and anionic dye removal from aqueous solution. The MCN was synthesized using a coprecipitation method. The physical properties of MCN were characterized using elemental analysis (CHNO), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray diffractometry (XRD). The results confirm that chitosan has been embedded on the surface of magnetic material and shows superparamagnetic properties behavior. A series of adsorption were conducted to investigate dosage of adsorbent, contact time and initial dye concentration to obtain the optimum condition of adsorption for both methylene blue (MB) and congo red (CR) dyes. The experimental equilibrium adsorption were then analyzed by the Langmuir and Freundlich isotherm models. Based on the correlation coefficient (R
2) values, the equilibrium adsorption data were fitted to the Langmuir isotherm model. The maximum adsorption capacity (q
m) obtained from the Langmuir isotherm model for MB and CR onto MCN was 0.1308 and 1.8257 mg/g, respectively. Results highlight the potential of MCN application as an adsorbent for water contaminated by dyes.
Mosquito-borne diseases are great concerns of people in the worldwide, especially dengue. There are 390 million people infected with dengue in a year. According to Dengue Situation Update Report for Western Pacific Region, there is an increment in the number of the infected areas as compared to the same period of previous year. World of Health Organization (WHO) and Ministry of Health (MOH) from every country pay the highest attention towards this issue. Other than inventing new formulation of adulticides, application of larvicide is newly emerging as an effective method to control mosquitoes from spreading virus. In this brief review, several recent studies about ways of the virus transmitted through mosquito biting behaviour, larvicide formulation and types of carrier agents being used to carry larvicide will be discussed. In order to sustain the aquatic ecosystem, materials for carrier agents should be environmental-friendly. This review paper will give insight into the recent development in carrier system for mosquitoes larvicide formulations.
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