Effective removal of chromium, copper, and nickel heavy metal ions from industrial electroplating wastewater by in situ oxidative adsorption using sodium hypochlorite as oxidant and sodium trititanate nanorod as adsorbent

doi:10.1016/j.cjche.2024.06.014

中国化学工程学报 ›› 2024, Vol. 74 ›› Issue (10): 312-330.DOI: 10.1016/j.cjche.2024.06.014

• Full Length Article • 上一篇

Effective removal of chromium, copper, and nickel heavy metal ions from industrial electroplating wastewater by in situ oxidative adsorption using sodium hypochlorite as oxidant and sodium trititanate nanorod as adsorbent

Muhammad Tayyab Butt, Hengbo Yin

Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China

收稿日期:2024-02-05 修回日期:2024-06-13 接受日期:2024-06-24 出版日期:2024-10-28 发布日期:2024-07-19
通讯作者: Hengbo Yin,E-mail:yin@ujs.edu.cn
基金资助:
This work was financially supported by the research funds from the Bureau of Danyang Science and Technology, China (SF201803) and the Department of Liaoning Science and Technology, China (2021JH1/10400063).

Effective removal of chromium, copper, and nickel heavy metal ions from industrial electroplating wastewater by in situ oxidative adsorption using sodium hypochlorite as oxidant and sodium trititanate nanorod as adsorbent

Muhammad Tayyab Butt, Hengbo Yin

Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China

Received:2024-02-05 Revised:2024-06-13 Accepted:2024-06-24 Online:2024-10-28 Published:2024-07-19
Contact: Hengbo Yin,E-mail:yin@ujs.edu.cn
Supported by:
This work was financially supported by the research funds from the Bureau of Danyang Science and Technology, China (SF201803) and the Department of Liaoning Science and Technology, China (2021JH1/10400063).

摘要/Abstract

摘要： Sodium hypochlorite and synthesized sodium trititanate nanorods (Na₂Ti₃O₇, 186 nm×1270 nm) were used as the oxidant and adsorbents for in situ oxidative adsorption treatment of actual electroplating wastewater containing Cr(VI) (2.6-5.2 mg·L^-1), Cu²⁺ (2.7-5.4 mg·L^-1), and Ni²⁺ (0.2705-0.541 mg·L^-1) ions at pH of 8.8-9.1 and 20-60 ℃. The as-synthesized sodium trititanate nanorods were characterized by XRD, HRTEM, N₂ adsorption/desorption, SEM, EDX, and zeta potential techniques. The concentrations of heavy metal ions in wastewater were analyzed by ICP technique. After in situ oxidative adsorption treatment under the concentrations of 25 g·L^-1 for sodium hypochlorite and 125 mg·L^-1 for sodium trititanate nanorods at 60 ℃ for 5 h, the heavy metal ion concentrations could be reduced from initial value of 2.6 to final value of 1.92 mg·L^-1 for Cr(VI), 3.6 to 0.17 mg·L^-1 for Cu²⁺, and from 0.2705 to 0.097 mg·L^-1 for Ni²⁺, respectively. Cr(VI), Cu²⁺ and Ni²⁺ ions could be effectively removed by the in situ oxidative adsorption method. The in situ oxidative adsorption processes of Cr(VI), Cu²⁺ and Ni²⁺ ions are satisfactorily simulated by the pseudo-second order adsorption kinetics and Langmuir adsorption isotherm, respectively. Adsorption thermodynamics analyses reveal that the oxidative adsorption processes of Cr(VI), Cu²⁺ and Ni²⁺ ions are spontaneous and endothermic. The oxidation degree of metal-contained complexes influences the values of thermodynamics functions.

关键词: Heavy metals, Oxidative adsorption, Electroplating wastewater, Sodium trititanate nanorods, Nanomaterials, Oxidation

Abstract: Sodium hypochlorite and synthesized sodium trititanate nanorods (Na₂Ti₃O₇, 186 nm×1270 nm) were used as the oxidant and adsorbents for in situ oxidative adsorption treatment of actual electroplating wastewater containing Cr(VI) (2.6-5.2 mg·L^-1), Cu²⁺ (2.7-5.4 mg·L^-1), and Ni²⁺ (0.2705-0.541 mg·L^-1) ions at pH of 8.8-9.1 and 20-60 ℃. The as-synthesized sodium trititanate nanorods were characterized by XRD, HRTEM, N₂ adsorption/desorption, SEM, EDX, and zeta potential techniques. The concentrations of heavy metal ions in wastewater were analyzed by ICP technique. After in situ oxidative adsorption treatment under the concentrations of 25 g·L^-1 for sodium hypochlorite and 125 mg·L^-1 for sodium trititanate nanorods at 60 ℃ for 5 h, the heavy metal ion concentrations could be reduced from initial value of 2.6 to final value of 1.92 mg·L^-1 for Cr(VI), 3.6 to 0.17 mg·L^-1 for Cu²⁺, and from 0.2705 to 0.097 mg·L^-1 for Ni²⁺, respectively. Cr(VI), Cu²⁺ and Ni²⁺ ions could be effectively removed by the in situ oxidative adsorption method. The in situ oxidative adsorption processes of Cr(VI), Cu²⁺ and Ni²⁺ ions are satisfactorily simulated by the pseudo-second order adsorption kinetics and Langmuir adsorption isotherm, respectively. Adsorption thermodynamics analyses reveal that the oxidative adsorption processes of Cr(VI), Cu²⁺ and Ni²⁺ ions are spontaneous and endothermic. The oxidation degree of metal-contained complexes influences the values of thermodynamics functions.

Key words: Heavy metals, Oxidative adsorption, Electroplating wastewater, Sodium trititanate nanorods, Nanomaterials, Oxidation

Muhammad Tayyab Butt, Hengbo Yin. Effective removal of chromium, copper, and nickel heavy metal ions from industrial electroplating wastewater by in situ oxidative adsorption using sodium hypochlorite as oxidant and sodium trititanate nanorod as adsorbent[J]. 中国化学工程学报, 2024, 74(10): 312-330.

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Effective removal of chromium, copper, and nickel heavy metal ions from industrial electroplating wastewater by in situ oxidative adsorption using sodium hypochlorite as oxidant and sodium trititanate nanorod as adsorbent

Effective removal of chromium, copper, and nickel heavy metal ions from industrial electroplating wastewater by in situ oxidative adsorption using sodium hypochlorite as oxidant and sodium trititanate nanorod as adsorbent

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