Preparation and nitrogen removal performance of magnetic amine-crosslinked biopolymer based reed straw

doi:10.19965/j.cnki.iwt.2022-1321

Abstract

Abstract:

In view of the waste of reed resources in Xiong’an New Area and the difficulty in separating the adsorbent in the process of removing nitrate nitrogen from water by adsorption，the magnetic amine-crosslinked biopolymer based reed straw was prepared from waste reed straw. The preparation method of the adsorbent was optimized by comprehensively considering the effects of reagent type，reagent dosage，reaction time，reaction temperature and other conditions during the preparation process. The adsorption performance of the adsorbent on simulated wastewater was investigated and characterized by SEM，VSM，FT-IR and XPS. The results showed that the removal rate of nitrate nitrogen in simulated sewage reached 93.2% by the adsorbent prepared by adding 5 mL of epichlorohydrin，20 mL of N，N-dimethylformamide and 5 mL of trimethylamine into 2 g of reed straw powder and reacting at 80 ℃ for 30 min. The static adsorption of nitrate nitrogen conformed to the Freundlich isotherm adsorption model and the quasi-second order adsorption kinetic model. In the dynamic adsorption experiment，the maximum adsorption capacity of the adsorbent for nitrate nitrogen was 12.74 mg/g. After six cycles of regeneration，the adsorption performance of the adsorbent had not significantly decreased. The characterization results showed that magnetic groups and quaternary amine groups were successfully loaded on the surface of the material，and the adsorption mechanism of nitrate nitrogen was mainly ion exchange. In conclusion，the prepared magnetic amine-crosslinked biopolymer based reed straw had good adsorption performance for nitrate nitrogen in water，and was expected to realize the high value utilization of reed resources.

Key words: adsorbents, reed straw, nitrate nitrogen

摘要：

针对雄安新区芦苇资源浪费及用吸附法去除水中硝酸盐氮的过程中吸附剂难以分离的问题，以废弃芦苇秸秆为原材料制备出了磁性胺化芦苇基吸附剂。综合考虑制备过程中试剂种类、试剂投加量、反应时间、反应温度等条件的影响，对吸附剂的制备方法进行了优化，考察了吸附剂对模拟废水的吸附性能并通过SEM、VSM、FT-IR和XPS进行表征。结果表明：2 g芦苇秸秆粉末加入5 mL环氧氯丙烷、20 mL N，N-二甲基甲酰胺、5 mL三甲胺，在80 ℃下反应30 min制备的吸附剂对模拟污水中硝酸盐氮的去除率最高达到了93.2%。对硝酸盐氮的静态吸附符合Freundlich等温吸附模型和准二级吸附动力学模型，动态吸附实验中吸附剂对硝酸盐氮最大的吸附量为12.74 mg/g，经过6次循环再生实验后吸附剂的吸附性能没有明显下降。表征结果显示磁性基团和季胺基团成功负载到材料表面，材料对硝酸盐氮的吸附机理主要为离子交换。综上，所制备的磁性胺化芦苇基吸附剂对水中硝酸盐氮具有良好的吸附性能，有望实现芦苇资源的高值化利用。

关键词: 吸附剂, 芦苇秸秆, 硝酸盐氮

CLC Number:

TQ424

Jiawang TIAN, Shanshan HE, Tao ZHANG, Zhe QIN. Preparation and nitrogen removal performance of magnetic amine-crosslinked biopolymer based reed straw[J]. Industrial Water Treatment, 2024, 44(1): 138-147.

田佳旺, 何珊珊, 张涛, 秦哲. 磁性胺化芦苇基吸附剂的制备及脱氮性能研究[J]. 工业水处理, 2024, 44(1): 138-147.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2022-1321

https://www.iwt.cn/EN/Y2024/V44/I1/138

Figures/Tables 15

Fig.1 Optimization of modification conditions

Fig. 2 SEM of RS（a，d），MAB-RS（b，e），MAB-RS-NO₃ ^-（c，f）

Fig.3 Hysteresis Curve of MB-RS and MAB-RS

Fig.4 Infrared Spectrum of RS and MAB-RS

Fig.5 Effect of reaction time on adsorption effect and adsorption kinetics curve

Table 1 Parameters of adsorption kinetic model

准一级动力学

准二级动力学

q _e/

（mg·g^-1）

k ₁

R ²

q _e/

（mg·g^-1）

k ₂

Fig.6 Adsorption isotherm model fitting

Table 2 Adsorption isotherm model parameters

Langmuir

Freundlich

q _m/

（mg·g^-1）

（L·mg^-1）

Table 3 Comparison of nitrate nitrogen adsorption capacity of different adsorbents

吸附剂	最大吸附量/（mg·g^-1）	参考文献
污泥改性活性炭	2.75	〔25〕
改性炭黑	9.10	〔26〕
铁改性生物炭	5.70	〔27〕
改性芦苇	4.24	〔28〕
改性香蒲秸秆	5.56	〔29〕
本材料	8.17	本研究

Fig.7 Effect of filler height on dynamic adsorption efficiency

Fig.8 Effect of flow rate on dynamic adsorption efficiency

Fig.9 Effect of influent nitrate nitrogen concentration on dynamic adsorption efficiency

Fig.10 Effect of regeneration times on dynamic adsorption efficiency

Fig.11 XPS spectrum before and after MAB-RS adsorbs nitrate nitrogen

Fig.12 Schematic diagram of adsorption process

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