Novel Mesoporous Lignin-Calcium for Efficiently Scavenging Cationic Dyes from Dyestuff Effluent

Kun Dai; Gulin Zhao; Zichen Wang; Xiaoqiang Peng; Jinglan Wu; Pengpeng Yang; Ming Li; Chenglun Tang; Wei Zhuang; Hanjie Ying

doi:10.1021/acsomega.0c05401

Novel Mesoporous Lignin-Calcium for Efficiently Scavenging Cationic Dyes from Dyestuff Effluent

ACS Omega. 2020 Dec 29;6(1):816-826. doi: 10.1021/acsomega.0c05401. eCollection 2021 Jan 12.

Authors

Kun Dai^{1

2

3}, Gulin Zhao^{1

2

3}, Zichen Wang^{1

2

3}, Xiaoqiang Peng^{1

2

3}, Jinglan Wu^{1

2

3}, Pengpeng Yang^{1

2

3}, Ming Li^{1

2

3}, Chenglun Tang^{1

2

3}, Wei Zhuang^{1

2

3}, Hanjie Ying^{1

2

3

4}

Affiliations

¹ College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 210009, China.
² National Engineering Technique Research Center for Biotechnology, Nanjing 211816, China.
³ Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing 210023, China.
⁴ State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211816, China.

Abstract

A novel adsorbent lignin-calcium was fabricated by a simple flocculation-sedimentation approach to remove methylene blue. The structure and morphology of the well-prepared sample were analyzed by multiple characterization methods. Lignin-calcium microspheres demonstrated a mesoporous and inserted layer structure with a coarse surface. Methylene blue (MB) adsorption by lignin-calcium complied with the Langmuir model, showing a maximum adsorption amount of 803.9 mg/g, exceeding that reported in the literature by 3-22-fold. The adsorption kinetics matched the pseudo-second-order model well. The pore volume diffusion model was technically applied to evaluate the mass transfer mechanisms. The effective pore volume diffusion coefficient was 6.28 × 10^-12 m²/s. Furthermore, lignin-calcium exhibited excellent adsorbability for methylene blue across a pH range from 3 to 11 and could be regenerated by hydrochloric acid with an elution efficiency of 62.44%. Multiple mechanisms may support the adsorption. Altogether, the tailor-made lignin-calcium is promising as an efficient and sustainable adsorbent for scavenging cationic dyes from dyestuff effluent.