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Defluoridationof drinking water by metal impregnated multi-layer green graphene fabricated from trees pruning waste

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Abstract

A novel adsorbent with excellent adsorptive properties for fluoride was prepared through a green and cheap synthesis route. Populus caspica pruning wastes, a cheap agri-waste material, were reduced to multi-layer green graphene (MLG) and then post-modified to aluminum/iron modified multi-layer green graphene (AMLG and IMLG). Batch experiments revealed the effect of pH (3–11), contact time (0.5–12 h), and initial fluoride concentration (5–40 mg/L). The conversion of raw material to MLG increased the specific surface area about 120 times (from 4 to 475 m2/g). Furthermore, a significant improvement in zero points of charge (pHzpc) was attained for IMLG (7.1) and AMLG (8) compared with pristine MLG (4.3). Fluoride showed superior affinity to AMLG and IMLG compared with MLG. Fluoride removal increased gradually by pH from 3 to 8 and then decreased sharply up to pH 11. The study of process dynamics demonstrated the monolayer fluoride adsorption onto AMLG and IMLG controlled by the chemisorptions. The highest predicted adsorption capacities based on the Langmuir model were 31.52, 47.01, and 53.76 mg/g for MLG, IMLG, and AMLG, respectively. Considering economic and technical feasibility presents AMLG and IMLG as a promising candidate against water contamination by elevated fluoride.

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Abbreviations

AT:

Temkin constant (L/mg)

BT:

Constant related to the heat of adsorption (J/mol)

C e :

Equilibrium concentration in solution (mg/dm3)

C in :

Initial concentrations (mg/L)

C s :

Saturation concentration in solution (mmol/dm3)

C t :

Equilibrium concentration in solution at time t (mg/dm3)

E :

Removal efficiency (%)

k 1 :

Pseudo-first-order rate constant (1/min)

k 2 :

Pseudo-second-order rate constant (g/mg min)

K dif :

Intraparticle diffusion rate constant (mg/g min0.5)

K f :

Freundlich isotherm constants (dm3/g)

K L :

Langmuir isotherm constants (dm3/mg)

n F :

Freundlich adsorption intensity

q e :

Equilibrium adsorbent concentration on adsorbent (mg/g)

q m :

Maximum monolayer capacity (mg/g)

q t :

Adsorbed metal concentration at time t (mg/g)

R 2 :

Correlation coefficients

R L :

Langmuir equilibrium factor

V :

Volume of the solution (L)

W :

Weight of the adsorbent (g)

0K:

Kelvin temperature

ΔG0 :

Gibbs standard free energy (kJ/mol)

ΔH0 :

Standard enthalpy (kJ/mol)

ΔS0 :

Standard entropy (J/mol K)

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Acknowledgments

The authors would like to thank the Department of Environmental Health Engineering, School of Public Health, Shahrood University of Medical Sciences, for their technical collaborations.

Funding

This research has been financially supported by a grant (Project No: 96131) from the environmental and occupational health research center, Shahroud University of Medical Sciences, Shahroud, Iran, and registered in Ethics Committee under ID no: IR.SHMU.REC.1396.130.

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Seyedeh Solmaz Talebi: investigation, data curation, resources, supervision, project administration, conceptualization, methodology writing, original draft. Allaah Bakhsh Javid: literature searching, writing, and editing. Ali Akbar Roudbari: conducting risk assessment, writing, and editing. Nader Yousefi and Seid Kamal Ghadiri: software, supervision. Mahmoud Shams and Amin Mousavi Khaneghah: Supervision, review, and editing.

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Correspondence to Seid Kamal Ghadiri, Mahmoud Shams or Amin Mousavi Khaneghah.

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Talebi, S.S., Javid, A.B., Roudbari, A.A. et al. Defluoridationof drinking water by metal impregnated multi-layer green graphene fabricated from trees pruning waste. Environ Sci Pollut Res 28, 18201–18215 (2021). https://doi.org/10.1007/s11356-020-11743-7

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