Study On Wastewater Treatment With Zinc Photocatalyst And Attapulgite Adsorbent

Currently, with the rapid development of industrial technology, organic dye wastewater and industrial emissions exceeded superscalar wastewater containing heavy metal ions gradually increased, causing water pollution gradually deepened. Researchers using light catalysts and adsorbents for wastewater degradation and adsorption, the effect is obvious, the water pollution problem has also been improved correspondingly.This paper studied the preparation of functional semiconductor nanomaterials and the study of the handling of organic wastewater;preparation of a new type of adsorbent that the ferric loaded onto attapulgite, combined with flame atomic absorption spectrometry(FAAS), to separate the preconcentration of trace heavy metal ions in wastewater.This paper studies the degradation of semiconductor nano materials for organic wastewater and adsorption behavior of new adsorbents for the heavy metal ions from wastewater.The main contents are:(1)The Zn O nanomaterials are prepared by direct hydrothermal method and first post-reflow to next hydrothermal method,the morphology were matches and flowers.By X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and excitation spectra characterization methods,analysis of the structure, morphology and optical properties of ZnO nanowire arrays.Exploring the function of ZnO material such as structure, morphology and its relationship between photocatalytic degradation activity through the degradation of methyl orange(MO) under visible-light irradiation.(2)By hydrothermal method to prepare ZnO nanowire arrays, heated to 220 ℃ on this basis, and added KSCN solution of ZnO nanowire arrays vulcanization, ZnO-ZnS heterojunction nanowire arrays can be obtained tadpole-shaped.By scanning electron microscopy(SEM), X-ray diffraction(XRD) and transmission electron microscopy(TEM) and other means of detection, proved the formation of ZnO-ZnS heterojunction nanowire arrays, and has been shaped ZnO-ZnS heterojunction nanowire arrays appearance and structure, analyzes the formation mechanism of ZnO-ZnS heterojunction nanowire arrays; ZnO-ZnS heterostructure nanowires simulate degradation of organic dyes methyl orange solution, because of ZnO and ZnS formed at the interface of a heterojunction, promote the photo-generated carriers directional migration, avoiding the carrier combined with the reunion, which greatly improves the efficiency of photocatalytic degradation, as the temperature rises, the hydrogen evolution rate is gradually increased.So ZnO-ZnS heterojunction nanowire arrays degradation activity is much higher than the degradation of the active ZnO nanowire arrays.(3)The ferric loaded onto ATP and the new adsorbent is prepared, its structure was characterized by scanning microscopy(SEM) and X-ray diffraction(XRD), and used to removal of trace As(Ⅴ), FAAS was used for detection. The 200-400 mesh of ATP loaded with 0.50 mol·L-1ferric nitrate sorbent reached adsorption equilibrium in 24 h and had a substantial binding capacity at pH 6.0. The maximum static adsorption capacity of the sorbent for As(Ⅴ) was 1.1669 mg·g-1. The sorbent showed good stability and reusability towards As(Ⅴ). The sorbent can potentially be used for the treatment of waste water containing arsenate.