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Enhanced termination of zinc and cadmium ions from wastewater employing plain and chitosan-modified mxenes: synthesis, characterization,and adsorption performance

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Green Chemical Engineering 2024年第3期5卷 339-347页

作者： njood r.azeez Suhaib S.Salih Mohammed Kadhom Harith N.Mohammed Tushar K.Ghosh Department of Chemical Engineering College of Engineering University of Tikrit Department of Environmental Science College of Energy and Environmental Science Al-Karkh University of Science Department of Nuclear Science & Engineering Institute University of Missouri-Columbia

Zinc and cadmium pollutants cause a significant environmental effect that cannot be ignored. Due to their considerable amount in an aqueous environment, industries are seeking suitable adsorbents that are environmentally friendly and inexpensive for removing metals from wastewater before disposing of them in surface waters. This research employed original MXene(MX) and chitosan-modified MXene(CSMX) to extract zinc(Zn(Ⅱ)) and cadmium(Cd(Ⅱ)) metal ions from water-based solutions. The composite material produced was analyzed using techniques such as X-ray Diffraction(XrD), Scanning Electron Microscopy(SEM), Fourier Transform Infrared Spectroscopy(FTIr), and Brunauer-Emmett-Teller(BET). The effects of contact duration, p H of the solution, and initial concentration of metal ions on the adsorption process of Zn(Ⅱ) and Cd(Ⅱ) onto both MX and CSMX composites were investigated. MX and prepared CSMX composite presented a high adsorption capacity for both studied heavy metals, which were 91.55 and 73.82 mg/g for Zn(Ⅱ) and Cd(Ⅱ) onto MX, 106.84 and 93.07 mg/g for Cd(Ⅱ) and Zn(Ⅱ) onto CSMX composite, respectively. Furthermore, the maximum competitive adsorption capacities for Zn(Ⅱ) onto MX and CSMX composites are 77.29 and 93.47 mg/g, and for are Cd(Ⅱ)60.30 and 79.66 mg/g, respectively. Hence, the removal capacities for both single and competitive metal ions were superior to CSMX composite. However, the adsorption capacities after five successive regeneration sequences were only dropped by 13.2% for Zn(Ⅱ) and 17.4% for Cd(Ⅱ) onto the CSMX composite compared to the first cycle. These results confirm that both metals could be efficiently terminated from wastewater, which makes the prepared CSMX composite a favorable candidate adsorbent in practical applications.

关键词： Adsorption Chitosan MXene Zn(II) Cd(II) Wastewater

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Counseling strategies for nutritional anemia by family physicians in Saudi Arabia,2016:Implication for training

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Family Medicine and Community Health 2017年第4期5卷 259-265页

作者： Fakhralddin Abbas Mohammed Elfakki njood Suliman Muhammed AlBarrak Assistant Professor of Community Medicine Family and Community Medicine DepartmentFaculty of Medicine Tabuk UniversityTabukKingdom of Saudi Arabia Health Consultant at Vision Health Consultancy KhartoumSudan Faculty of medicine Qassim UniversityQassimKingdom of Saudi Arabia

Context:Prevalence of nutritional anemia among Saudi female and children is evident and has been reflected in different studies,most of researchers conclude that there is a gap in dietary coun-seling in addition to the poor awareness of community about appropriate dietary habits;this study is trying to assess counseling behavior and training competency of family physician at primary health centers with respect to nutritional ***:Study objective is to assess general beliefs,practice,and level of training in coun-seling by family ***:This is a cross-sectional study design;data collected using self-administered questionnaire provided to the doctor at clinic ***:The most commonly learned counseling technique in order as follows motivational interviewing(68%),cognitive behavioral therapy(58%),and 15-Minute Hour approach(53%).Conclusion:This study confirms the presence of positive counseling beliefs and practices by family physicians;however,the result is also reflects the current reluctant state of family physicians in devoting ample time for nutritional anemia counseling.

关键词： Counseling beliefs dietary habits nutritional anemia

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