ADSORPTION PERFORMANCE AND MECHANISM OF Zn<sup>2+</sup> ON MICROWAVE-PREPARED ALKALI LIGNIN BIOCHAR

CHEN Long; LI Kai; TU Zhi; ZHOU Yu; ZHANG Jilong; MI Baobin; WU Fangfang

doi:10.13205/j.hjgc.202308013

Volume 41 Issue 8

Aug. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(8): 100-108

CHEN Long, LI Kai, TU Zhi, ZHOU Yu, ZHANG Jilong, MI Baobin, WU Fangfang. ADSORPTION PERFORMANCE AND MECHANISM OF Zn2+ ON MICROWAVE-PREPARED ALKALI LIGNIN BIOCHAR[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 100-108. doi: 10.13205/j.hjgc.202308013

Citation:

CHEN Long, LI Kai, TU Zhi, ZHOU Yu, ZHANG Jilong, MI Baobin, WU Fangfang. ADSORPTION PERFORMANCE AND MECHANISM OF Zn²⁺ ON MICROWAVE-PREPARED ALKALI LIGNIN BIOCHAR[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 100-108. doi: 10.13205/j.hjgc.202308013

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ADSORPTION PERFORMANCE AND MECHANISM OF Zn²⁺ ON MICROWAVE-PREPARED ALKALI LIGNIN BIOCHAR

doi: 10.13205/j.hjgc.202308013

1. School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410125, China;
2. Institute of Vegetable Research, Hunan Academy of Agricultural Sciences, Changsha 410125, China;
3. China Machinery International Engineering Design & Research Institute Co., Ltd, Changsha 410021, China

Received Date: 2022-06-14
Available Online: 2023-11-15

Abstract

Abstract

Alkali lignin is the major by-product of the paper-making industry. In order to explore a feasible way for resource utilization of alkali lignin, biochar was prepared from alkali lignin under microwave pyrolysis, and the adsorption performance and mechanism of biochar were further investigated in this paper. The results showed that the best adsorption effect of biochar was achieved under the adsorption condition of a charring temperature of 400 ℃, a biochar dosage of 0.4 g/L, an initial Zn²⁺ concentration of 200 mg/L, and solution pH=5; the adsorption process could be well described by the Langmuir model and the quasi-secondary kinetic model, indicating that the adsorption process was dominated by chemisorption, and the maximum adsorption capacity (q_m) of biochar calculated from the Langmuir fitting reached 371.3 to 412.3 mg/g; the adsorption mechanism analysis of biochar revealed that the mechanisms mainly include mineral co-precipitation, DOM interaction, surface complexation (O-functional group complexation and Zn²⁺-π complexation), and ionic exchange. In addition, the results of quantitative analysis of the adsorption mechanism showed that mineral co-precipitation and surface complexation contributed 81.8%~85.6% and 7.6%~9.9% to the adsorption capacities of biochars, respectively.
- alkali lignin,
- biochar,
- Zn²⁺,
- adsorption,
- quantitative analysis of mechanism

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References(44)

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