Adsorption properties of phosphorus-based biochar on Pb2+ containing wastewater

doi:10.19965/j.cnki.iwt.2021-0473

Abstract

Abstract:

Phosphorus⁃based biochars（BC600，BC650） were prepared from sludge and phosphorus containing reagents（potassium dihydrogen phosphate，calcium dihydrogen phosphate）and used to remove Pb²⁺ from wastewater. The effects of adsorbent dosage，initial pH，concentration，and adsorption time on Pb²⁺ adsorption by BC600 and BC650 were investigated using a single factor static adsorption experiment. Results indicated that the initial pH of Pb²⁺ wastewater had a significant effect on the adsorption efficiency of BC600 and BC650. When the pH was 5，the adsorption capacity of BC600 and BC650 were 37 mg/g and 10 mg/g，respectively. Adsorption kinetic and isotherm fitting models revealed that BC600 accorded with the second⁃order kinetic and Langmuir adsorption isotherm model，while BC650 accorded with the first⁃order kinetic and Freundlich adsorption isotherm model. XRD and SEM analyses indicated that the adsorption process of phosphorus⁃based biochar was the synergic action of physics and chemistry adsorption，of which BC600 mainly showed chemical adsorption and BC650 mainly showed physical adsorption.

Key words: sludge, pyrolysis, phosphorus?based biochar, adsorption efficiency, Pb²⁺ containing wastewater

摘要：

以污泥与含磷试剂（磷酸二氢钾、磷酸二氢钙）为原料制备磷基生物炭（BC600、BC650）并用于废水中Pb²⁺的去除。通过单因素静态吸附实验分别研究了吸附剂添加量、含Pb²⁺废水初始pH、浓度和吸附时间等对BC600和BC650吸附水中Pb²⁺的影响。结果表明，含Pb²⁺废水初始pH显著影响BC600和BC650的吸附效率，在pH=5时，BC600和BC650的吸附量分别为37 mg/g和10 mg/g。吸附动力学和吸附等温模型拟合结果表明BC600符合二级动力学模型和Langmuir吸附等温模型，BC650符合一级动力学模型和Freundlich吸附等温模型。结合XRD与SEM分析，BC600和BC650对Pb²⁺的吸附过程包含物理-化学吸附协同作用，其中BC600以化学吸附为主，BC650以物理吸附为主。

关键词: 污泥, 热解, 磷基生物炭, 吸附效率, 含铅废水

CLC Number:

X703
O647.33

Shijie ZHANG, Weihua GU, Jianfeng BAI, Bin DONG, Xuning ZHUANG, Jing ZHAO. Adsorption properties of phosphorus-based biochar on Pb²⁺ containing wastewater[J]. Industrial Water Treatment, 2022, 42(2): 111-117.

张世杰, 顾卫华, 白建峰, 董滨, 庄绪宁, 赵静. 磷基生物炭对含Pb²⁺废水的吸附特性研究[J]. 工业水处理, 2022, 42(2): 111-117.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0473

https://www.iwt.cn/EN/Y2022/V42/I2/111

Figures/Tables 11

Table 1 Specific surface area of sludge and phosphorus-based biochar

材料	原污泥	BC600	BC650
微孔容积V _m/（cm³·g^-1）	4.350	10.150	18.047
比表面积a _s，BET/（m²·g^-1）	18.924	44.178	78.549
总孔隙体积/（cm³·g^-1）	0.063	0.096	0.140

Fig. 1 SEM of sludge and phosphorus⁃based biochar

Fig. 2 FT-IR spectra of sludge and phosphorus⁃based biochar

Fig. 3 XRD spectra of sludge and phosphorus⁃based biochar

Fig. 4 Effect of the dosage of phosphorus⁃based biochar on adsorption efficiency

Fig. 5 Effect of pH on adsorption efficiency

Fig. 6 Effect of time on adsorption capacity

Table 2 Adsorption kinetic parameters

材料	拟一级动力学			拟二级动力学
材料	q _e/（mg·g^-1）	k ₁/min^-1	R ²	q _e/（mg·g^-1）	k ₂/（g·mg^-1·min^-1）	R ²
BC650	10.60	0.005 00	0.974	12.30	0.000 527	0.945
BC600	38.75	0.006 44	0.953	45.27	0.000 157	0.986

Fig. 7 Effect of Pb²⁺ mass concentration on adsorption efficiency

Table 3 Adsorption isotherm model parameters

材料	Langmuir吸附等温模型			Freundlich吸附等温模型
材料	R ²	K _L	q _m/（mg·g^-1）	R ²	K _F	n
BC600	0.970	0.004 48	138.5	0.822	10.588	2.94
BC650	0.837	0.102	11.76	0.930	0.085	27

Fig.8 Characterization of phosphorus⁃based biochar after adsorption

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Adsorption properties of phosphorus-based biochar on Pb²⁺ containing wastewater

磷基生物炭对含Pb²⁺废水的吸附特性研究

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