Sorption of tetracycline on H₂O₂-modified biochar derived from rape stalk

Abstract

To determine the sorption potential and mechanisms of tetracycline (TC) on pristine and H 2 O 2-modified biochars, rape stalk biochars were produced and modified by H 2 O 2. The specific surface area and pore volume of biochars increased with improving pyrolysis temperature, while the acidic groups decreased. Moreover, modified by H 2 O 2 , much more oxygen-containing functional groups were introduced. The results of sorption dynamics and isothermals tests showed that RB300 had the largest TC sorption capacity of 35.90 mg/ g, which was ascribed to a plenty of non-carbonized organic matter and surface functional groups were retained. Modified by H 2 O 2 , the sorption of TC on biochars was enhanced which indicated the dominated sorption mechanisms were H-bonding and π-π electron donor acceptor interaction. The pH value would impact on sorption, and the maximum sorption capacity was obtained at pH = 9.0. Both cation concentration and type would affect the TC sorption.

Synergetic effect of metal–support for enhanced performance of the Cu–ZnO–ZrO2/UGSO catalyst for CO2hydrogenation to methanol

“…The well-defined hysteresis loops with steep adsorption and desorption branches at high relative pressure ( P / P 0 = 0.6–0.9) belong to the H3-type, suggesting the presence of mesopores with aggregates of plate-like particles accompanied by slit-shaped pores. 46 After H 2 O 2 activation, the BET surface area of the support increases by 135%, which is well consistent with the literature 36–39 showing that H 2 O 2 activation can lead to the improvement in BET surface area of the sample. In addition, the presence of mesopores over the wide range size of 5–35 nm (Fig.…”

Engineered biochar – A sustainable solution for the removal of antibiotics from water

“…Using rape stalk for pyrolysis, Tan et al [159] produced three types of pristine BC at 300, 450, and 600 °C (BC-300, BC-450, and BC-600, respectively). These BCs were subsequently modified by a post-synthesis method using 30% H2O2 (BCM-300, BCM-450, BCM-600).…”

“…In the case of modified BCs produced at higher temperatures, the amount of adsorbed TC increased by 30%, reaching a maximum for BCM-600. This arises from the oxidative activity of H2O2, which causes an increase in the number of oxygen functional groups participating in the adsorption of TC molecules through hydrogen bonding and π-π EDA interactions [159].…”

“…Yang 159 et al [193] studied the TC adsorption onto pristine BC derived from sewage sludge and onto a composite (BC-Fe) made from sewage sludge and iron compounds. The feedstock was impregnated with iron sulfate [Fe2(SO4)3] before pyrolysis (pre-treatment).…”

Tetracycline adsorption on magnetic sludge biochar: size effect of the Fe 3 O 4 nanoparticles

“…Therefore, it is of the utmost importance to eliminate TC from wastewater, and some technologies have been developed, such as adsorption, membrane separation, photocatalysis and chemical oxidation [9][10][11][12]. Among these methods, adsorption is still the most promising method due to the cost efficiency, wide range of application, simple design and less toxic byproducts.…”