인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
크롬 서지관리 다운로드
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Dye pollution in water poses serious health and ecological risks, requiring wastewater treatment before discharge and prompting increased research attention due to the widespread use of dyes in various industries. This study investigates the biosorption of methylene blue (MB) using a novel composite of chitosan and Bacillus subtilis exopolysaccharides (EPS). Fourier-transform infrared spectroscopy (FTIR) analysis confirmed the presence of essential functional groups for dye adsorption. The biosorption process was pH-dependent, with optimal removal efficiencies at pH 6 for the chitosan/EPS composite and pH 7 for chitosan alone, showing increased adsorption capacity with rising pH from 3.0 to 7.0. Contact time experiments demonstrated efficient MB removal in approximately 30 min, achieving decolorization rates of 71.6% for the composite and 60.62% for chitosan. The composite also demonstrated a higher maximum biosorption capacity (14.26 mg g−1) than chitosan (13.70 mg g−1) according to the Langmuir isotherm model, which best described the monolayer adsorption process. Kinetic analyses revealed that the pseudo-second order model best described the adsorption process, with calculated capacities closely matching experimental values (41.67 mg g−1 for chitosan and 45.87 mg g−1 for the composite). Post-adsorption FTIR results revealed involvement of –OH, –NH, –COO−, and –PO₄³− groups via electrostatic, hydrogen-bonding, and π–π interactions, confirming the interaction between MB and functional groups on the biosorbents. These findings highlight the synergistic effect of combining chitosan with EPS, resulting in a promising, efficient, and rapidly equilibrating biosorbent for mitigating dye pollution in wastewater. This work presents the first reported use of Bacillus subtilis exopolysaccharide combined with chitosan as a fully biodegradable composite biosorbent, exhibiting superior adsorption capacity (14.26 mg g−1), markedly faster kinetics (K₂ = 0.176 g mg−¹ min−¹), and equilibrium attainment within 30 min compared to pristine chitosan and most reported biopolymer-based adsorbents. Optimizing biosorption conditions can enhance dye removal efficiencies and contribute to sustainable environmental management practices.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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