Dadrasnia Arezoo, Usman Mohammed Maikudi, Abutawila Zaed, Omar Rahmat, Ismail Salmah, Abdullah Rosazlin
1Institute of Research Management and Services, Deputy Vice Chancellor (Research & Innovation) Office, University of Malaya, Kuala Lumpur, Malaysia.
2Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
J Environ Health Sci Eng. 2019 Nov 7;17(2):571-579. doi: 10.1007/s40201-019-00371-0. eCollection 2019 Dec.
Arsenic is a global environmental contaminant that imposes a big health threat which requires an immediate attention to clean-up the contaminated areas. This study examined the biosorption ability of a novel Bacillus strain for the removal of arsenate (pentavalent arsenic) from aqueous solution. The optimum biosorption condition was studied as a function of biomass dosage, contact time and pH. Dubinin-Radushkevich (D-R), Freundlich, and Langmuir models were applied in describing the biosorption isotherm. The maximal biosorption capacity (92%) was obtained at 25 °C, biomass concentration 2000 mg/L at pH value of 4 and contact period of 50 min. Strain 139SI act as an admirable host to the arsenate. Thermodynamic assessment (ΔG, ΔH, and ΔS) also suggested the chemisorption and feasible process of As(V) biosorption. The reuse study illustrated the highest recovery of 93% using 1 M HCl, and a decrease of 25% in recovery of As(V) ions after 10 times desorption process.
砷是一种全球环境污染物，对健康构成重大威胁，需要立即关注以清理受污染地区。本研究考察了一种新型芽孢杆菌菌株从水溶液中去除砷酸盐（五价砷）的生物吸附能力。研究了作为生物量剂量、接触时间和pH值函数的最佳生物吸附条件。应用杜宾宁-拉杜舍维奇（D-R）、弗伦德利希和朗缪尔模型描述生物吸附等温线。在25℃、生物量浓度2000mg/L、pH值为4和接触时间为50分钟的条件下获得了最大生物吸附容量（92%）。菌株139SI对砷酸盐是一种理想的宿主。热力学评估（ΔG、ΔH和ΔS）也表明了As(V)生物吸附的化学吸附和可行过程。再利用研究表明，使用1M HCl时回收率最高可达93%，经过10次解吸过程后，As(V)离子的回收率下降了25%。
