The present manuscript reports the removal of arsenic from aqueous solution using iron oxide composite of carbon derived from the plant material Prosopis spicigera L. wood which depletes the ground water of ponds, lakes and other water bodies. The adsorbent was characterised by Fourier Transform Infra Red spectroscopy and Scanning Electron Microscope for surface analysis; Brunauer–Emmett–Teller and methylene blue method for surface area determination and pH_zpc for surface charge determination. Experimental conditions such as pH, contact time, adsorbate initial concentration and in the presence other ions are varied to study the batch adsorption equilibrium experiment. The adsorption process was tested with Langmuir and Freundlich isotherm model and Langmuir isotherm was best suited. Sorption kinetics was analysed with pseudo-first- and second-order kinetics but adsorption follows second order kinetics. For an initial concentration of 60 mg/L of As(III) ions, adsorption capacity was found to be 83.84 mg/g at pH = 6.0. Thermodynamically the adsorption process is spontaneous, feasible and endothermic in nature. Adsorption involves pore diffusion, external mass transfer and complex formation. Column study was performed to apply this process for large scale treatment.

中文翻译：

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使用Prosopis spicigera L. wood（PsLw）碳-氧化铁复合材料去除砷

本手稿报道了使用氧化铁复合物从水溶液中去除砷的方法，该复合物由植物材料Prosopis spicigera L. wood木材衍生而来，碳消耗掉池塘，湖泊和其他水体的地下水。用傅里叶变换红外光谱和扫描电子显微镜对吸附剂进行表面分析。Brunauer–Emmett–Teller和亚甲基蓝方法测定表面积和pH _zpc用于确定表面电荷。改变pH，接触时间，被吸附物的初始浓度以及在其他离子存在下的实验条件，以研究间歇式吸附平衡实验。用Langmuir和Freundlich等温线模型测试了吸附过程，Langmuir等温线最适合。吸附动力学用伪一级和二级动力学进行分析，但吸附遵循二级动力学。对于初始浓度为60 mg / L的As（III）离子，在pH = 6.0时的吸附容量为83.84 mg / g。在热力学上，吸附过程本质上是自发的，可行的并且是吸热的。吸附涉及孔扩散，外部传质和复合物形成。进行了柱研究以将该方法应用于大规模处理。