硫脲/海藻酸钠对Cr(VI)的吸附和光催化还原协同去除机制

郝军杰; 郭成; 高翔鹏; 李明阳; 龙红明

doi:10.13801/j.cnki.fhclxb.20210622.001

硫脲/海藻酸钠对Cr(VI)的吸附和光催化还原协同去除机制

doi: 10.13801/j.cnki.fhclxb.20210622.001

安徽工业大学　冶金工程学院，马鞍山 243002

基金项目: 国家自然科学基金(51904004)；中国博士后科学基金第66批面上资助项目(2019M662129)；安徽省高校科学研究重点项目(KJ2019A0058)

详细信息

通讯作者:
高翔鹏，博士，副教授，硕士生导师，研究方向为多孔生物质金属离子吸附剂的合成制备及其机理　 E-mail：gxp1992@ahut.edu.cn

中图分类号: TB332
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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-07
- 修回日期: 2021-06-11
- 录用日期: 2021-06-14
- 网络出版日期: 2021-06-22
- 刊出日期: 2022-04-01

Synergistic removal mechanism of Cr(VI) by thiourea/sodium alginate adsorption and photocatalytic reduction

School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, China

摘要

摘要: 光催化是一种高效去除溶液中的Cr(VI)的方法。相较于吸附法，其可以在短时间内将Cr(VI)还原Cr(III)。对海藻酸钠(SA)进行化学改性，以戊二醛为交联剂，将硫脲接枝到SA上制备硫脲/海藻酸钠凝胶球(GTSA)，探究在光照条件下其对溶液中的Cr(VI)的吸附和还原机制。相较于SA，GTSA对不同波长光的吸收能力大幅增加，吸附和还原Cr(VI)的能力增加，在紫外汞灯的照射下，pH=1时，Cr(VI)的去除率达99%，还原率达79%。通过FTIR、SEM、UV-DRS和XPS对GTSA吸附还原Cr(VI)的过程进行机制分析，结果表明Cr(VI)的去除过程是静电吸附与光催化还原的协同作用。
- 光催化还原 /
- 海藻酸钠 /
- 铬 /
- 化学改性 /
- 吸附 /
- 硫脲 /
- 协同作用
Abstract: The photocatalysis is an efficient method to remove Cr(VI) from aqueous solution. Compared with adsorption, which can reduce Cr(VI) to Cr(III) in a short time. Glutaraldehyde was used as a crosslinking agent to graft thiourea onto sodium alginate (SA) for the synthesis of thiourea/sodium alginate beads (GTSA), the adsorption and reduction mechanism of Cr(VI) in solution under light condition was investigated. Compared with SA, the light absorbance of GTSA is greatly increased, as well as the ability to adsorb and reduce Cr(VI). Under the irradiation of ultraviolet mercury lamp at pH=1, the removal rate of Cr(VI) reaches 99%, and the reduction rate reaches 79%. The mechanism of Cr(VI) adsorption reduction by GTSA was analyzed by FTIR, SEM, UV-DRS and XPS, which indicated that the removal process of Cr(VI) is a synergistic effect of electrostatic adsorption and photocatalytic reduction.
- photocatalytic reduction /
- sodium alginate /
- chromium /
- chemical modification /
- adsorption /
- thiourea /
- synergistic effect

HTML全文

图 1 硫脲/海藻酸钠凝胶球(GTSA)合成方案

Figure 1. Thiourea/sodium alginate beads (GTSA) synthesis scheme

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图 2 紫外光照条件下海藻酸钠(SA)和GTSA作用下的Cr(VI)去除率(a)与还原率(b)

Figure 2. Removal rate (a) and reduction rate (b) of Cr(VI) by sodium alginate (SA) and GTSA solution under UV irradiation

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图 3 不同光源下GTSA对Cr(VI)的去除率

Figure 3. Removal rate of Cr(VI) by GTSA under different light sources

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图 4 时间变化对GTSA去除Cr(VI)的影响

Figure 4. Influence of time change on removal of Cr(VI) by GTSA

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图 5 投加量对GTSA去除Cr(VI)的影响

Figure 5. Influence of dosage on Cr(VI) removal by GTSA

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图 6 不同pH水溶液下的Cr(VI)形态

Figure 6. Cr(VI) morphologies in aqueous solutions with different pH values

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图 7 SA、GTSA吸附剂和光催化后的GTSA吸附剂的FTIR图谱

Figure 7. FTIR spectra of SA, GTSA adsorbent and GTSA adsorbent after photocatalysis

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图 8 GTSA光催化前 ((a)、(c)) 和光催化后 ((b)、(d)) 的SEM图像

Figure 8. SEM images of GTSA before ((a), (c)) and after ((b), (d)) photocatalysis

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图 9 SA和GTSA的DRS光谱

Figure 9. DRS spectra of SA and GTSA

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图 10 SA和GTSA的荧光光谱图

Figure 10. Fluorescence spectra of SA and GTSA

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图 11 GTSA光催化还原Cr(VI)的XPS光谱

Figure 11. XPS spectra of GTSA photocatalytic reduction of Cr(VI) (Before photocatalysis: (a) full spectrum; (c) O1s; (e) N1s; (g) Cr2p; Photocatalysis: (b) full spectrum; (d) O1s; (f) N1s; (h) Cr2p)

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图 12 GTSA还原Cr(VI)的机制

Figure 12. Mechanism of Cr(VI) reduction by GTSA

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