High effective catalyst based on Ni doped TiO₂ coated natural cotton fibers for catalytic reduction of organic pollutants

ABSTRACT

A new type of nickel doped titanium oxide (Ni-TiO₂) coated natural cotton fibers (CF) and Ni-TiO₂ wrapped sodium alginate (Alg) hydrogel was developed for the efficient reduction of different contaminants. Ni-TiO₂ was prepared by low-temperature method and coated on CF using Alg as a binder and entrapped inside Alg hydrogel. Ni-TiO₂ coated CF (Ni-TiO₂/CF) and Ni-TiO₂ wrapped Alg (Ni-TiO₂/Alg) were utilized for catalytic elimination of wastewater pollutants. Ni-TiO₂/CF and Ni-TiO₂/Alg were initially tested as nanocatalysts for reduction of potassium ferricyanide, 4-nitrophenol, congo red, and methylene blue (MB), and exhibited superior catalytic performance toward MB reduction. Different parameters such as catalyst amount, MB concentration, reducing agent amount, and recyclability were optimized. Comparatively, Ni-TiO₂/CF revealed the best catalytic performance for MB reduction having the highest reaction rate constant (2.1564 min⁻¹). Ultimately, the catalyst preserved superior activity in recyclability evaluation, confirming that Ni-TiO₂/CF is a good catalyst for the efficient removal of MB up to four cycles. Ni-TiO₂/CF can more easily be recovered compared to Ni-TiO₂/Alg by easily pulling out the fibers from reaction medium, which is the main advantage of Ni-TiO₂/CF. Moreover, Ni-TiO₂/CF and Ni-TiO₂/Alg were examined in real samples, providing the effective reduction of MB. The developed nanocatalyst offers a cost- and time-effective material for environmental safety purpose.

摘要

开发了一种新型的镍掺杂二氧化钛 (Ni-TiO₂) 涂层天然棉纤维 (CF) 和Ni-TiO₂包裹海藻酸钠 (Alg) 水凝胶, 以有效减少各种污染物. 采用低温法制备了Ni-TiO₂, 并以Alg为粘结剂将其包覆在CF上, 然后将其包裹在Alg水凝胶中. 采用Ni-TiO₂包覆CF (Ni-TiO₂/CF) 和Ni-TiO₂包覆Alg (Ni-TiO₂/Alg) 催化去除废水污染物. Ni-TiO₂/CF和Ni-TiO₂/Alg最初被测试为还原铁氰化钾, 4-硝基苯酚, 刚果红和亚甲基蓝 (MB) 的纳米催化剂. 然而, Ni-TiO₂/CF和Ni-TiO₂/Alg对MB还原表现出优异的催化性能. 对催化剂用量, MB浓度, 还原剂用量, 可回收性等参数进行了优化. 相比之下, Ni-TiO₂/CF对MB还原的催化性能最好, 反应速率常数最高 (2.1564 min⁻¹) . 最终, 该催化剂在可回收性评估中保持了优异的活性, 证实Ni-TiO₂/CF是高效去除MB的良好催化剂, 最多可进行四次循环. 与Ni-TiO₂/Alg相比, Ni-TiO₂/CF更容易从反应介质中拔出纤维, 这是Ni-TiO₂/CF的主要优点. 此外, 在实际样品中对Ni-TiO₂/CF和Ni-TiO₂/Alg进行了检测, 从而有效降低了MB. 所开发的纳米催化剂为环境安全目的提供了成本和时效的材料.

KEYWORDS:

• Ni_doped_TiO₂
• cotton fibers
• catalytic reduction
• nitrophenol
• dyes
• potassium ferricyanide

关键词:

• 镍掺杂
• 棉纤维
• 硝基苯酚
• 染料
• 铁氰化钾
• 催化还原

Highlights

• Efficient catalyst based on Ni-TiO₂ warped alginate hydrogel and coated cotton fibers

• Utilization of designed catalyst for reduction of different pollutants.

• High rate constants toward MB using Ni-TiO₂/CF (1.8662 min^–1).

• Highly stable and recyclable catalyst without loss in activity up to four cycles.

Acknowledgments

This research work was funded by Institutional Fund Projects under grant no. (IFPDP-247-22). Therefore, the authors gratefully acknowledge technical and financial support from Ministry of Education and Deanship of Scientific Research (DSR), King Abdulaziz University (KAU), Jeddah, Saudi Arabia.

Funding

This research work was funded by Institutional Fund Projects under grant no. (IFPDP-247-22). Therefore, the authors gratefully acknowledge technical and financial support from Ministry of Education and Deanship of Scientific Research (DSR), King Abdulaziz University (KAU), Jeddah, Saudi Arabia.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

Supplemental data for this article can be accessed online at https://doi.org/10.1080/15440478.2022.2085839