Dewi Anggraeni Kumala, Sharma Raju Kumar, Das Koyeli, Sukul Uttara, Lin Pin-Yun, Huang Yi-Hsun, Lu Chung Ming, Lu Cheng-Kang, Chen Tsung-Hsien, Chen Chien-Yen
Department of Physics, National Chung Cheng University, University Road, Minhsiung, Chiayi County, 62102, Taiwan.
Doctoral Program in Science, Technology, Environment, and Mathematics, Department of Earth and Environmental Sciences, National Chung Cheng University, 168 University Road, Min-Hsiung, Chiayi County, 62102, Taiwan.
Heliyon. 2023 May 1;9(5):e15919. doi: 10.1016/j.heliyon.2023.e15919. eCollection 2023 May.
Heavy metal pollution of water is a burning issue of today's world. Among several strategies involved for heavy metal remediation purpose, biomineralization has shown great potential. Of late, research has been focused on developing effective mineral adsorbents with reduced time and cost consumption. In this present paper, the Biologically-Induced Synthetic Manganese Carbonate Precipitate (BISMCP) was produced based on the biologically-induced mineralization method, employing in aqueous solutions containing urea and MnCl. The prepared adsorbent was characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), SEM-energy dispersive X-ray spectroscopy (SEM-EDX), X-ray diffraction (XRD) and BET surface area analyzer. EDX analysis showed the elements in the crystal BISMCP were Mn, C, and O. XRD result of BISMCP determined the crystal structure, which is close to rhodochrosite (MnCO). Spectral peaks of FTIR at 1641.79 cm confirmed the appearance of C[bond, double bond]O binding, with strong stretching of CO in Amide I. From the six kinds of BISMCP produced, sample MCP-6 has the higher specific surface area by BET analysis at 109.01 m/g, with pore size at 8.76 nm and higher pore volume at 0.178 cm/g. These specifications will be suitable as an adsorbent for heavy metal removal by adsorption process. This study presents a preliminary analysis of the possibility of BISMCP for heavy metals adsorption using ICP multi-element standard solution XIII (As, Cr, Cd, Cu, Ni, and Zn). BISMCP formed from 0.1 MnCl and 30 ml of bacteria volume (MCP-6) produced a better adsorbent material than others concentrations, with the adsorption efficiency of total As at 98.9%, Cr at 97.0%, Cu at 94.7%, Cd at 88.3%, Zn at 48.6%, and Ni at 29.5%. Future work could be examined its efficiency adsorbing individual heavy metals.
水体中的重金属污染是当今世界的一个紧迫问题。在用于重金属修复的多种策略中，生物矿化已显示出巨大潜力。最近，研究集中在开发能减少时间和成本消耗的有效矿物吸附剂。在本文中，基于生物诱导矿化方法，在含有尿素和氯化锰的水溶液中制备了生物诱导合成碳酸锰沉淀（BISMCP）。使用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、SEM能谱仪（SEM-EDX）、X射线衍射（XRD）和BET比表面积分析仪对制备的吸附剂进行了表征。EDX分析表明晶体BISMCP中的元素为锰、碳和氧。BISMCP的XRD结果确定了其晶体结构，与菱锰矿（MnCO₃）相近。FTIR在1641.79 cm⁻¹处的光谱峰证实了C=O键的出现，酰胺I中CO有强烈伸缩振动。通过BET分析，从制备的六种BISMCP中，样品MCP-6具有较高的比表面积，为109.01 m²/g，孔径为8.76 nm，孔容为0.178 cm³/g。这些特性使其适合作为通过吸附过程去除重金属的吸附剂。本研究使用ICP多元素标准溶液XIII（砷、铬、镉、铜、镍和锌）对BISMCP吸附重金属的可能性进行了初步分析。由0.1 M氯化锰和30 ml菌液体积形成的BISMCP（MCP-6）比其他浓度制备的吸附材料更好，对总砷的吸附效率为98.9%，铬为97.0%，铜为94.7%，镉为88.3%，锌为48.6%，镍为29.5%。未来的工作可以研究其对单一重金属的吸附效率。
