The possible utilization of rice husk activated carbon as an adsorbent for the removal of methylene blue dye from aqueous solutions has been investigated. In this study, activated carbons, prepared from low -cost rice husk by sulfuric acid and zinc chloride activation, were used as the adsorbent for the removal of methylene blue, a basic dye, from aqueous solutions. Effects of various experimental parameters, such as adsorbent dosage and particle size, initial dye concentration, pH and flow rate were investigated in column process. The maximum uptakes of methylene blue by activated rice husk carbon at optimized conditions (particle sizes: 140 µm; Flow rate: 1.4 mL/min; pH: 10.0; initial volume of methylene blue: 50 mL and initial concentration of methylene blue: 4.0 mg/L etc.) were found to 97.15%. The results indicate that activated carbon of rice husk could be employed as low-cost alternatives to commercial activated carbon in waste water treatment for the removal of basic dyes. This low cost and effective removal method may provide a promising solution for the removal of crystal violet dye from wastewater.
In the present work, halloysite nano-clay (HNTs) based hydrogel was fabricated and their efficiency for the removal of methylene blue dye was studied. The hydrogel films were prepared with varying amount of halloysite nano-clay via facile solution casting method. Effect of halloysite clay on adsorption performance of composite was investigated. The hydrophobic thermoplastic synthetic polymer, polylactic acid (PLA) was blended with hydrophilic polymer polyvinyl alcohol (PVA) and HNTs to synthesize hydrogels. Swelling behavior and antimicrobial efficiency was also evaluated. The halloysite incorporating films showed excellent antibacterial activity. Swelling capacity of hydrogel with increased halloysite content was reduced due to increased crosslinking among polymer chains. Halloysite incorporated hydrogel exhibited higher adsorption ability as compared to film comprising of only PVA and PLA and dye removal followed pseudo first order kinetics. Film with 0.03 g HNTs rapidly attained adsorption-desorption equilibria and removed the dye completely within 30 min. Results confirmed that synthesized film could be potentially used for the removal of cationic dye and fabricated hydrogel film have promising potential for wastewater treatment since a higher adsorption capacity was observed for halloysite nano-clay incorporated hydrogel.
Covid-19 is the name of a serious pandemics in the current world. Although this disease is responsible for very limited symptoms and complications like severe acute respiratory syndrome, fever, headache, diarrhea, malaise and weakness but its probability of affecting more people is very high. For this reason, its psychological and socio-economic impact demanded more attention of the world community. We have very limited research-based information regarding this issue. The aim of this study was to evaluate the negative impact of Covid 19 on physical, mental and socio-economic condition among general non-Covid patients. This was a prospective survey-based study which was conducted in the Department of Medicine, Shaheed Ziaur Rahman Medical College, Bogura, Bangladesh during the period from July 2020 to December 2020. In total 128 patients with several health problems, physically or virtually attended the OPD of the mentioned hospital were enrolled as the study population. A pre-designed questionnaire was used in patent data collection. All data were processed, analyzed and disseminated by MS Office and SPSS version as per need. In analyzing the negative impact on physical health of participants we observed, 10.94%, 8.59%, 7.03%, 5.47% and 3.13% patients were with feeling of physical fatigue, gaining extra body-weight, insomnia, general weakness and having chronic disease respectively. In this current study, in analyzing the negative impact on mental health of participants we observed feeling of suffocation, feeling of exhausted, fear of falling ill and anxiety about future were found as some major negative mental impacts of Covid 19 on the respondents which was among 11.72%, 10.94%, 8.59% and 7.81% participants respectively. As negative impact on social life of participants due to Covid 19 continuing remote socialization, intolerance to others, random commitment violation and ended social life were found among 8.59%, 3.91%, 3.13% and 1.56% participants ...............
We investigated the effects of different variables on cesium adsorption from aqueous solutions using a synthesized nanocomposite. The surfaces of synthesized spherical mesoporous silica were modified with potassium hexacyanoferrate and characterized by different techniques including XRD, FT-IR, SEM, TGA, and BET/BJH. The response surface methodology based on the central composite design was used to optimize cesium ion adsorption conditions such as the effects of initial cesium concentration, contact time, temperature, and pH. The equilibrium concentration data were analyzed by Langmuir, Freundlich, and Tempkin isotherm models. The isotherm studies showed that monolayer adsorption isotherm (Langmuir) is consistent with the experimental data. Based on kinetic studies, Blanchard's pseudo-second-order reaction kinetics model provides the best correlation of the experimental data. The initial concentration and pH were the most influential factors in cesium adsorption. The result showed the nanocomposite adsorbed cesium ions selectively even in the presence of high Na + , K + , and Sr 2+ ions.
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