Performance and mechanisms of NaOH and ball-milling co-modified biochar for enhanced the removal of Cd2+ in synthetic water: A combined experimental and DFT study

Arabian Journal of Chemistry

卷:15

Guihua Jiang¹  Wei Deng²  Hua Du³  Wenli Chen³  Shurui Cao⁴  Cunxian Xi⁵  Bobin Tang⁵ 

[1] Corresponding authors.;

[2] College of Ethnic Medicine, Chengdu University of TCM, Sichuan 611137, China;

[3] College of Pharmacy, Chengdu University of TCM, Sichuan 611137, China;

[4] Forensic Identification Center, Southwest University of Political Science and Law, Chongqing 401120, China;

[5] The Inspection Technical Center of Chongqing Customs, Chongqing 400020, China;

关键词: Biochar;    Water treatment;    Cadmium;    Adsorption kinetics and isotherm;    Mechanism;    DFT calculation;   

DOI  :  

来源: DOAJ

【 摘 要 】

A multifunction magnetic carbonaceous adsorbent (MBM/OH/BC) was synthesized by facile NaOH and ball-milling co-modified biochar, and applied for removing Cd2+ in water. The results showed MBM/OH/BC exhibited excellent adsorption capacity (183.59 mg/g for Cd2+), short equilibrium time (60 min) and good reusability (the declining efficiency <20% after four adsorption and desorption cycles) compared with pristine biochar. Meanwhile, the modification mechanisms of NaOH and ball-milling to biochar were explored by a series of characterizations (XRD, SEM-EDS, BET, XPS and FTIR, et al). The results indicated the remarkable adsorption performance of MBM/OH/BC was mainly attributed to the co-modification significantly increased the specific surface area, mineral content and cation exchange capacity of biochar, thereby further improving the precipitation, cation exchange and complexation with Cd2+. In addition, the results of adsorption mechanisms showed that the joint contribution proportion to the total adsorption capacity of precipitation, cation exchange and complexation was up to 90%, indicating the three mechanisms were the primary adsorption mechanism. To sum up, NaOH and ball-milling co-modification was an effective strategy to increase the adsorption capacity of the pristine biochar for heavy metals from water.

【 授权许可】

Unknown