Papers by Author: Ting Zhang

Abstract: Two kinds of attapulgite (ATP)-based catalysts (Fe (III)/ATP and Fe₂O₃/ATP) were prepared and their heterogeneous Fenton-like reactions were investigated for the degradation of Sodium dodecyl benzene sulfonate (SDBS) and contrast with that of Fe₂O₃ catalyst. Compared with the Fe₂O₃ catalyst, the two new ATP-based catalysts exhibited a higher activity and stability in SDBS mineralization. The effects of pH, H₂O₂ dosage, catalyst dosage and temperature were investigated. With incorporating ATP, the degradation ratio was more than that of Fe₂O₃ catalyst. And an enhancement of H₂O₂ utilization ratio was achieved.

Abstract: Fe₂O₃/H₂O₂, a kind of Fenton-like agent, was used to degrade an anion surfactant, sodium dodecyl benzene sulfonate(SDBS)，in an aqueous solution. Through a number of batch degradation experiments under various conditions, it was found that the reactivity of the system increased by increasing temperature. The SDBS degradation ratio will increase by, respectively, increasing H₂O₂ concentration and Fe₂O₃ dosage at some extent, but too high H₂O₂ concentration or Fe₂O₃ dosage will decrease the degradation efficiency. pH value has some influences on the reactivity of the system; from 2 to 10, the system maintains high efficiencies all the time. It also can be seen that Fe₂O₃/H₂O₂ Fenton-like reaction almost has the same efficiency as homogeneous Fenton reaction, while the former has a widely pH range (2-10), and Fe₂O₃ can be separated easily and has no secondary pollutants.

Abstract: Fe₂O₃ and Fe₂O₃/attapulgite(ATP) catalyst was used for Fenton reaction to degrade an anion surfactant, sodium dodecyl benzene sulfonate(SDBS)，in an aqueous solution. Comparative studies indicated that Fe₂O₃/ATP-catalyzed Fenton system and Fe₂O₃-catalyzed Fenton system have the same catalysis capability. These two systems all have a widely pH range (2-10), and the catalysts can be reused and have no secondary pollutants. It also can be seen that Fe₂O₃/ATP-catalyzed Fenton-like reaction has much efficiency than Fe₂O₃-catalyzed Fenton reaction.

Abstract: Fe₂O₃/attapulgite(ATP) catalyst was successfully prepared for Fenton reaction to degrade an anion surfactant, sodium dodecyl benzene sulfonate(SDBS)，in an aqueous solution. BET, SEM, FT-IR were performed to characterize Fe₂O₃/ ATP catalyst. Comparative studies indicated that the SDBS degradation ratios were much higher in presence of Fe₂O₃/ATP and H₂O₂ than those in presence of Fe₂O₃/ATP or H₂O₂ only, which suggested that the Fe₂O₃/ATP-catalyzed Fenton-like reaction governed the SDBS removal process. It also can be seen that Fe₂O₃/ATP-catalyzed Fenton-like reaction almost has the same efficiency as homogeneous Fenton reaction, while the former can be reused and has no secondary pollutants.

Abstract: Fe₂O₃/attapulgite(ATP) catalyst was successfully prepared for Fenton reaction to degrade anion an surfactant, Sodium dodecyl benzene sulfonate(SDBS). Through a number of batch degradation experiments under various conditions, it was found that the reactivity of the system increased by increasing Fe₂O₃/ATP dosage and temperature. The SDBS degradation ratio will increase with increasing H₂O₂ concentration at some extent. But too high H₂O₂ concentration will make degradation efficiency decrease. The system maintains high efficiencies all experimental pH value(2-10).

Abstract: Sulfur dioxide is one of the major pollutants resulting from fuel combustion. In this study, CaO and attapulgite were utilized as raw material for synthesizing CaO/attapulgite(CaO/ATP) desulfurizer. The performance of samples was studied in dynamic conditions. Major factors affecting the desulfurization such as weight ratio of CaO to total, types of modifiers, desulfurizer particle size, bed temperature were investigated. The desulfurization agent synthesized under optimal synthesis conditions with an CaO content of 30 wt% and an NaOH modifier, and the desulfurization reaction processed under optimal synthesis conditions with water content of 20~30wt%, a particle size of 1/10 of desulfurization tower diameter and room temperature, exhibit sulfur tolerance of 17.97wt%.

Abstract: The objectives of this study were to convert marigold dregs to a cationic metal ions and dye adsorbent and further to investigate the potential of using the adsorbent for the removal of copper(Ⅱ) and methylene blue (MB) from effluents. The base washed marigold dregs and citric acid (CA) modified marigold dregs (MMD) were prepared and the structure were investigated by fourier transform infrared, emission scanning electron microscope and X-ray photoelectron spectroscopy. The results show that the modification did not significantly change the morphology of the dregs surface structure but the esterificated reaction could increase the carboxyl groups and hydroxyl groups on the surface of the adsorbent. The adsorption ability are also evaluated by MB and copper(Ⅱ) and the results show the MMD is an excellent adsorbent. Due to the high adsorption quantity, it may be used as a low cost alternate adsorbent for the elimination of metal and dye ions form effluents.