PG and Research Department of Chemistry, R.V. Govt. Arts College, Chengalpattu, 603 001, Tamil Nadu, India.
Department of Analytical Chemistry, University of Madras, Guindy Campus, Chennai, 600 025, Tamil Nadu, India.
Environ Sci Pollut Res Int. 2024 Jun;31(29):41990-42011. doi: 10.1007/s11356-024-33894-7. Epub 2024 Jun 10.
Hydroxyapatite (HAp) stands as an inorganic compound, recognized as a non-toxic, bioactive ceramic, and its composition closely resembles that of bone material. In this study, nHAp was prepared from waste oyster shells, which are biowaste rich in calcium carbonate. nHAp with its unique catalytic property can be used as an adsorbent in various fields, including wastewater treatment. nHAp with an exceptional surface adsorbent with excellent chemical stability, enabling its catalytic function. Nano hydroxyapatite doped with Zinc oxide (ZnO) by wet chemical precipitation and made into a composite with Graphene oxide (GO) by modified hummers method followed by grinding, which was taken as 9:1 ratio (nHAp/ZnO and GO) of weight, enhances its tensile and mechanical strength. The energy band gap of nHAp photocatalyst was evaluated as 3.39 eV and that of the in nHAp/ZnO/GO photocatalyst was narrowed to 1.77 eV. The ternary nanocomposites are very efficient in generating the photogenerated electrons and holes, thereby improving the degradation potential of dye effluents to by-products such as CO and HO. The nanocomposites photocatalyst were characterized by FTIR, XRD, SEM, TEM, EDS, XPS, DRS, and BET techniques. The UV-visible study shows the complete dye degradation efficiency of the prepared nanocomposites photocatalyst. In this study, the prepared nanocomposites nHAp/ZnO/GO have studied their efficiency for the removal of MB dye in a batch process by varying the dosage from 0.1 to 0.5 g, and the effects of dosage variations, pH, kinetic, scavenger study were evaluated at a time interval of 30 min. The removal of dye was found to be 99% at 150 min of 0.3 g dosage and pH = 12 is most favorable as it reached the same percentage at 90 min. The as-prepared nanocomposite nHAp/ZnO/GO fits the kinetic rate constant equation and shows a pseudo-first-order reaction model. This study indicates the suitability for dye removal due to the synergistic effect and electrostatic interaction of the synthesized ternary nanocomposite, which shows the potential, socially active, low-cost-effective, eco-friendly, and safe for photocatalytic degradation of MB from wastewater.
羟基磷灰石（HAp）是一种无机化合物，被认为是一种无毒、生物活性陶瓷，其成分与骨材料非常相似。在这项研究中，nHAp 是由富含碳酸钙的生物废物牡蛎壳制备的。nHAp 具有独特的催化性能，可用作废水处理等各个领域的吸附剂。nHAp 具有出色的表面吸附剂和优异的化学稳定性，使其具有催化功能。通过湿化学沉淀将氧化锌（ZnO）掺杂到纳米羟基磷灰石中，并通过改良的 Hummers 法将其与氧化石墨烯（GO）制成复合材料，然后进行研磨，重量比为 9:1（nHAp/ZnO 和 GO），提高了其拉伸和机械强度。nHAp 光催化剂的能带隙评估为 3.39 eV，而在 nHAp/ZnO/GO 光催化剂中，能带隙缩小到 1.77 eV。三元纳米复合材料在产生光生电子和空穴方面非常有效，从而提高了染料废水转化为 CO 和 HO 等副产物的降解潜力。纳米复合材料光催化剂采用 FTIR、XRD、SEM、TEM、EDS、XPS、DRS 和 BET 技术进行了表征。UV-可见研究表明，所制备的纳米复合材料光催化剂对染料的完全降解效率。在这项研究中，研究了通过改变剂量从 0.1 到 0.5 g 来制备纳米复合材料 nHAp/ZnO/GO 对 MB 染料去除的效率，同时评估了剂量变化、pH 值、动力学、清除剂研究在 30 分钟的时间间隔内的影响。在 0.3 g 剂量和 pH=12 的条件下，染料的去除率达到 99%，这是最有利的，因为在 90 分钟时达到了相同的百分比。所制备的纳米复合材料 nHAp/ZnO/GO 符合动力学速率常数方程，并呈现出准一级反应模型。这项研究表明，由于合成的三元纳米复合材料的协同效应和静电相互作用，该复合材料适用于去除染料，这表明它具有潜力、社会活跃性、低成本效益、环保且安全，可用于从废水中光催化降解 MB。
Environ Sci Pollut Res Int. 2024-6
Environ Sci Pollut Res Int. 2023-6
Zotero 插件