Magnetite (Fe₃O₄) and PbS nano-crystals were prepared by hydrothermal and sonochemical-assisted method in an inexpensive and bio-compatible environment. Secondly metal (Co, Ag, Ni, Cd, Mn, Cr)-doped PbS nanostructures and Fe₃O₄/metal-doped nanostructures were made via wet chemical method. The influence of various metal doping on the shape and size of the magnetic nanomaterials was examined. Nanomaterials were characterized by XRD, SEM, TEM and FT-IR spectroscopy. VSM approves the magnetic property of the magnetite and nanocomposites. The results show superparamagnetic properties of nanomaterials. Under sonochemical irradiation, cavitation is formed in solvent where the bubbles are firstly formed, secondly grow, and finally collapse. This bubble production can make hot spots about 5000 C and 1800 kPa, which are applicable in various bond breaking and preparations of dispersions. It is a sound field with 20 kHz frequency that has many applications in the preparation of magnetic and photo-catalyst nanostructures. The photo-catalyst properties of nanocomposites were investigated via photo-degradation of three azo dyes acid blue, acid black and acid brown under ultraviolet irradiation in times less than 60 min.

在廉价且生物相容的环境中，通过水热和声化学辅助方法制备了磁铁矿（Fe ₃ O ₄）和PbS纳米晶体。其次是金属（Co，Ag，Ni，Cd，Mn，Cr）掺杂的PbS纳米结构和Fe ₃ O _4。通过湿化学方法制备了掺杂金属的纳米结构。研究了各种金属掺杂对磁性纳米材料的形状和尺寸的影响。通过XRD，SEM，TEM和FT-IR光谱对纳米材料进行了表征。VSM批准了磁铁矿和纳米复合材料的磁性。结果显示了纳米材料的超顺磁性。在声化学辐射下，在溶剂中形成气穴，在该溶剂中首先形成气泡，然后生长并最后破裂。这种气泡的产生可产生约5000 C和1800 kPa的热点，适用于各种键断裂和分散体的制备。这是一个频率为20 kHz的声场，在磁性和光催化剂纳米结构的制备中具有许多应用。