利用废弃枸杞茎简单制备碳量子点和活性炭用于铜离子的检测和吸附,RSC Advances

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利用废弃枸杞茎简单制备碳量子点和活性炭用于铜离子的检测和吸附
RSC Advances ( IF 3.9 ) Pub Date : 2023-07-13 , DOI: 10.1039/d3ra04026g
Yunjia Xu ₁ , Jingming Lan ₁ , Baoying Wang ₁ , Chunmiao Bo ₁ , Junjie Ou ₂ , Bolin Gong ₁

Affiliation

去除重金属污染是一个永无休止的话题，因为重金属会对人体和环境造成不可逆转的损害。开发用于重金属离子检测和吸附的新型材料刻不容缓。本文以废弃枸杞秆为碳源，开发了两种简单的方法，成功制备了活性炭（AC）和碳量子点（CQDs）。通过调整前驱体与活化剂的质量比、活化剂的类型和活化时间来优化制备条件。当选择氢氧化钠（NaOH）作为活化剂（NaOH与AC前驱体的质量比为6:1），并在600 ℃下活化1 h时，所得AC-NaOH的比表面积最高-3 达到3016 m ² g ⁻¹。^{对铜离子(Cu 2+} )的吸附容量达到68.06 mg g ^-1。通过调节枸杞茎浓度、反应时间和温度，优化了CQDs的制备条件。当枸杞茎浓度为7.5 g L ^-1，在200 ℃下活化24 h时，所得CQDs分别在空白和12种金属离子溶液中表现出较强的荧光发射，但加入Cu 2+ 后荧光强度明显^下降。在10~80 nM范围内，Cu ²⁺浓度与CQDs荧光强度之间的线性相关系数为0.992，检测限为2.83 nmol L ^-1。由此，以枸杞茎为原料制备了这两种材料，为铜离子的吸附和检测应用开辟了新途径。

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Simple fabrication of carbon quantum dots and activated carbon from waste wolfberry stems for detection and adsorption of copper ion

Removal of heavy metal pollution is an endless topic, because heavy metals can cause irreversible damage to the human body and environment. It is urgent to develop novel materials for detection and adsorption of heavy metal ions. In this paper, waste wolfberry straw was utilized as a carbon source, and two simple methods were developed to successfully prepare activated carbon (AC) and carbon quantum dots (CQDs). The fabrication conditions were optimized by adjusting the mass ratio of precursor to activator, type of activator and activation times. When sodium hydroxide (NaOH) was selected as an activator (6 : 1, mass ratio of NaOH to AC-precursor), and the activation was performed at 600 °C for 1 h, the highest specific surface area of the obtained AC-NaOH-3 reached 3016 m² g⁻¹. The adsorption capacity for copper ions (Cu²⁺) reached 68.06 mg g⁻¹. The preparation conditions for CQDs were also optimized by adjusting the concentration of wolfberry stem, reaction time and temperature. When the wolfberry stem concentration was 7.5 g L⁻¹, and the activation was performed at 200 °C for 24 h, the obtained CQDs exhibited strong fluorescence emission in the blank and 12 kinds of metal ion solutions, respectively, however, the fluorescence intensity was remarkably decreased after adding Cu²⁺. In the range of 10–80 nM, the linear correlation coefficient between the concentration of Cu²⁺ and fluorescence intensity of CQDs was 0.992, and the limit of detection was 2.83 nmol L⁻¹. Thus, these two kinds of materials were prepared from wolfberry stem, which opened up a new way for the application in adsorption and detection of copper ions.

更新日期：2023-07-13

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