Sludge Activated carbon was prepared by heating dewatered municipal sludge to 400°C using ZnCl₂ as an activator. The abilities of clay modified with 1%, 3%, and 5% of the sludge activated carbon to adsorb heavy metals were determined. The materials were subjected to scanning electron microscopy and low-temperature nitrogen-adsorption, extraction efficiency, adsorption kinetics, and isothermal adsorption tests to allow the pore sizes, pore volume distributions, pore structures, and adsorption capacities to be assessed. The pores were mostly mesopores and were mostly amorphous (e.g., ink-bottle-shaped holes). With the solid/liquid ratio kept constant, the adsorption capacity at equilibrium increased as the sludge activated carbon content of the clay increased. For clay modified with 1% sludge activated carbon, the adsorption capacity for Cd(II) at equilibrium decreased from 314 to 280 mg/kg as the solid/liquid ratio increased from 80 to 160 g/L. The adsorption capacities for Cu(II) at equilibrium at solid/liquid ratios of 80, 120, and 160 g/L were 442, 409, and 383 mg/kg, respectively, which were 41%, 34%, and 37% higher, respectively, than the Cd(II) adsorption capacities at the same solid/liquid ratios. It was concluded that the sludge activated carbon was suitable for trapping heavy metals such as Cd(II) and Cu(II).

污泥活性炭是通过使用ZnCl ₂将脱水的城市污泥加热到400°C来制备的作为激活剂。确定了用1％，3％和5％的污泥活性炭改性的粘土吸附重金属的能力。对材料进行扫描电子显微镜和低温氮吸附，萃取效率，吸附动力学和等温吸附测试，以评估孔径，孔体积分布，孔结构和吸附能力。孔大部分是中孔，大部分是无定形的（例如，墨水瓶形的孔）。在固/液比保持恒定的情况下，随着黏土污泥活性炭含量的增加，平衡时的吸附容量也增加。对于用1％污泥活性炭改性的粘土，随着固/液比从80 g / L增加到160 g / L，平衡时Cd（II）的吸附容量从314降低到280 mg / kg。固/液比分别为80、120和160 g / L时，平衡状态下对Cu（II）的吸附容量分别为442、409和383 mg / kg，分别提高了41％，34％和37％。在相同的固/液比下，Cd（II）的吸附能力分别比Cd（II）高。结论是，污泥活性炭适用于捕集重金属，例如Cd（II）和Cu（II）。