The treatment of cyanide contaminated wastewater from a gold processing plant was performed by the synthesized nanostructured Layered Double Hydroxide (LDH) which has known as a Hydrotalcite-type anionic clay. LDH was synthesized by the co-precipitation process, characterized by X-ray fluorescence (XRF), X-ray powder diffraction (XRD), scanning electron microscope (SEM) Brunauer-Emmett-Teller (BET), Fourier-transform infrared spectroscopy (FTIR) and Wavelength Dispersive X-ray analysis (WDX) and applied for removal of free cyanide from both synthetic solution and mining effluent. The maximum particle size of synthesized LDH was determined to be 4 nm based on the Scherrer’s equation. The maximum loading capacity of LDH, 60 mg/g, indicates that LDH is an interesting adsorbent for cyanide removal. The data modeling showed that the kinetic and equilibrium data best fitted by FPKM and RPIM, respectively, also, rate-controlling step in the adsorption process is intra-particle diffusion based on Weber–Morris plot, and the adsorption of CN⁻ onto LDH is a two-step process. The thermodynamic studies confirm that the adsorption of free cyanide on Mg/Al LDH is a spontaneous and endothermic process. The energy of activation for adsorption of free cyanide on Mg/Al LDH was determined to be 6.14 kJ/mol, which is in the range physicochemical sorption. The mining wastewater treatment was performed by the synthesized LDH. The adsorption experiments showed that more than 90% of free cyanide was removed from the real solution during a short period of contact time, which confirms the ability of LDH for the treatment of industrial cyanide contaminated wastewater.

来自黄金加工厂的氰化物污染废水的处理是通过合成的纳米结构层状双氢氧化物 (LDH) 进行的，LDH 被称为水滑石型阴离子粘土。LDH由共沉淀法合成，X射线荧光表征(XRF)、X 射线粉末衍射 (XRD)、扫描电子显微镜 (SEM) Brunauer-Emmett-Teller (BET)、傅里叶变换红外光谱 (FTIR) 和波长色散 X 射线分析 (WDX) 并应用于去除合成溶液和采矿废水中的游离氰化物。根据谢勒方程，合成的 LDH 的最大粒径被确定为 4 nm。LDH 的最大负载量为 60 mg/g，表明 LDH 是一种有趣的氰化物去除吸附剂。数据模型表明，分别由 FPKM 和 RPIM 拟合的动力学和平衡数据最适合，而且吸附过程中的速率控制步骤是基于 Weber-Morris 图的颗粒内扩散，以及 CN 的吸附^-LDH 上是一个两步过程。热力学研究证实游离氰化物在 Mg/Al LDH 上的吸附是一个自发和吸热过程。Mg/Al LDH 吸附游离氰化物的活化能测定为 6.14 kJ/mol，在物理化学吸附范围内。采矿废水处理由合成的LDH进行。吸附实验表明，在较短的接触时间内从真实溶液中去除了90%以上的游离氰化物，证实了LDH处理工业氰化物污染废水的能力。