“…Specifically, the adsorption capacity of TC on MS-2 and MS-3 reached the maximum as the dosage of adsorbent was 0.7 g l −1 , while the optimum dosage of MS-1 was 0.65 g l −1 . It was believed that the high MS concentration may result in a cover-up effect on adsorbent surface, blocking the adsorption sites to decrease the adsorption capacity [ 28 , 29 ]. Figure 5 Effect of dosage (C 0 : 200 mg l −1 , initial pH: 5.5).…”
Activated sludge, which is difficult and expensive to treat and dispose of, is a key concern in wastewater treatment plants. In this study, magnetic sludge biochar containing activated sludge and different sizes (14.3, 40.2 and 90.5 nm) of Fe
3
O
4
nanoparticles was investigated as an effective adsorbent for tetracycline (TC) adsorption. Magnetic sludge-based biochar was prepared by a facile cross-linking method and characterized by transmission electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and zeta potential analysis. The adsorption performances of TC on three kinds of adsorbents were investigated. Although 14.3 nm Fe
3
O
4
nanoparticles could be inclined to aggregate and partially filled with pores of biochar, it turned out that magnetic sludge biochar with 14.3 nm Fe
3
O
4
nanoparticles exhibited optimum performance for TC removal with adsorption capacity up to 184.5 mg g
−1
, due to the larger amounts of functional groups and the change of zeta potential. Furthermore, the adsorption kinetics of TC on three kinds of adsorbents were studied, which implied that the pseudo-second-order kinetic model exhibited the better fit for the entire sorption process.
“…Specifically, the adsorption capacity of TC on MS-2 and MS-3 reached the maximum as the dosage of adsorbent was 0.7 g l −1 , while the optimum dosage of MS-1 was 0.65 g l −1 . It was believed that the high MS concentration may result in a cover-up effect on adsorbent surface, blocking the adsorption sites to decrease the adsorption capacity [ 28 , 29 ]. Figure 5 Effect of dosage (C 0 : 200 mg l −1 , initial pH: 5.5).…”
Activated sludge, which is difficult and expensive to treat and dispose of, is a key concern in wastewater treatment plants. In this study, magnetic sludge biochar containing activated sludge and different sizes (14.3, 40.2 and 90.5 nm) of Fe
3
O
4
nanoparticles was investigated as an effective adsorbent for tetracycline (TC) adsorption. Magnetic sludge-based biochar was prepared by a facile cross-linking method and characterized by transmission electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and zeta potential analysis. The adsorption performances of TC on three kinds of adsorbents were investigated. Although 14.3 nm Fe
3
O
4
nanoparticles could be inclined to aggregate and partially filled with pores of biochar, it turned out that magnetic sludge biochar with 14.3 nm Fe
3
O
4
nanoparticles exhibited optimum performance for TC removal with adsorption capacity up to 184.5 mg g
−1
, due to the larger amounts of functional groups and the change of zeta potential. Furthermore, the adsorption kinetics of TC on three kinds of adsorbents were studied, which implied that the pseudo-second-order kinetic model exhibited the better fit for the entire sorption process.
“…Adsorption has been received considerable attention by worldwide researchers because of high effectiveness and economic for treatment of ammonium. 17,18 Therefore, numerous adsorbents have been developed to study their adsorptive performance on ammonium such as activated zeolite and chitosan, 19 greensand, 20 biochar, 17,[21][22][23][24] activated carbon, 18 clay minerals, 25 fiber, 26 magnetically modified excess sludge, 27 NaA zeolites, 28 and banana peels (BPs). 29 It was reported that the characteristics of surface chemistry is more important than surface area and pore structure of adsorbents in adsorption of inorganic compounds from aqueous solution.…”
High ammonium concentration in groundwater in Viet Nam is a threaten consequence to Vietnamese people in suburban and rural areas. Coconut coir is an economic waste of Viet Nam's agriculture with million tons generated every year. In this work, NaOH treatment of raw coconut coir (RCC) was implemented to obtain activated biomaterial (NaACC) for evaluation of ammonium adsorption from synthetic and ground waters. First, the effects of adsorbent dosage, initial ammonium concentration, reaction time, temperature on adsorption performance, adsorption isotherm, and kinetics for ammoniumcontained synthetic water were investigated. Second, the ammonium adsorption performance of NaACC from a natural groundwater was also evaluated. The removal efficiencies of ammonium were 49.5, 60.6, and 66.7% with maximum adsorption capacities of 0.51, 0.67, and 0.74 mg/g at temperatures of 30, 40, and 50 C, respectively, at pH 7.0, NaACC dose 40 g/L, initial ammonium concentration 40 mg/L, and reaction time 144 h. The NaACC displayed the best ammonium adsorption following Langmuir isotherm (R 2 = 0.9990) and pseudo-second-order kinetic model (R 2 = 0.9989). The NaACC also exhibited a good ammonium adsorption in natural groundwater with removal efficiency and adsorption capacity of 82.6% and 0.77 mg/g, respectively.Particularly, NaACC can be regenerated up to three cycles for consecutive adsorption of ammonium in groundwater without loss of its adsorptive performance. Therefore, NaACC derived from agricultural wastes was a potential biomaterial for cleaning ammonium from contaminated groundwater.
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