Preparation of GO-modified TFC-FO membrane support layers with different particle sizes by film coating machine

(1) The PSF support layer of GO modified composite membrane was prepared by phase inversion method, as shown in Figure 3-1.

The specific preparation steps are as follows: firstly, dry GO nanosheets with a particle size of 0.2–10 μm (the mass percentage of GO is 0wt%, 0.05wt%, 0.15wt%, 0.2wt%, 0.3wt%) were dispersed in a volume of 5 mL of DMF solution, and then sonicated in a sonicator for 2 h to form a homogeneous dispersion of GO. Secondly, GO dispersions with different doping amounts were added to the NMP solution containing 8wt% PSF, and stirred vigorously in a Water Bath at 60 °C to dissolve evenly. After standing for 24 hours to defoam, the glass plate was coated with an automatic coating machine, and then the glass plate was quickly immersed in DI for phase inversion to obtain a GO-doped PSF base film with a thickness of 100 μm. The basement membrane was soaked in DI water for 24h to completely remove the residual solvent.

(2) The preparation method of the PSF support layer of the GO modified composite membrane with a particle size of 50-150nm and greater than 10µm is the same as that of the 0.2-10µm GO modified composite membrane support layer.

Attached is the list of related instruments used in this experiment in "Preparation and Evaluation of Graphene Oxide Composite Forward Osmosis Membrane":

Laboratory General Equipment - Environment
	Huitai HWS-11 constant temperature Water Bath
	Specification parameters: temperature control range RT+5~100°C, temperature fluctuation ±0.5°C, temperature resolution 0.1°C, working tank volume 2.5L, temperature control mode PID instrument control mode, pump circulation mode internal circulation, total power 400W, Timing range 1~9999min, power supply voltage AC 220V, 50Hz, pump flow without pump, working tank size 150*150*110mm
Membrane Proofing- Membrane
	Domestic TBJ-B2 wire rod scraper integrated coating testing machine
	Specification parameters: coating accuracy ±0.003mm, coating thickness range 0.01~10mm, coating speed 2~200mm/s, coating format 300*400mm (coating length 0-400mm can be set arbitrarily), coating time digital display , different speeds, time precision control, coating rod specification accuracy 0.001mm, effective coating width 300mm (coating thickness is determined according to the wire rod model), scraper length 400MM material/stainless steel, host power supply 220V 50HZ 1700W, external dimension 626* 410*520mm, net weight 55KG, infinitely variable speed control, base plate made of aluminum alloy, optional accessories leakage tank, substrate fixing fixture, fine-tuning leveling support leg device, glass plate, silicone pad and weight (for coating substrate Application of uneven material thickness), coating film width control baffle, coating accuracy 0.001mm
Environmental Testing - Other
	Domestic brand PS-80 wire rod ultrasonic cleaning machine
	Specification parameters: inner tank size 500×300×15mm, outer dimension 550×330×28mm, capacity 22L, total power 480W, ultrasonic frequency 40KHz, heating power 500W, time setting 1-30Min, temperature setting range 20-80℃ , suitable for cleaning objects RDS wire rod, OSP wire rod, RK wire rod, domestic wire rod, Wet Film Applicator, etc.
Environmental testing - temperature and humidity control
	Tester 101-0DB Electric Forced Air Drying Oven
	Specification parameters: temperature control range RT+10~250°C, temperature fluctuation ±1.0°C, temperature resolution 0.1°C, temperature uniformity ±2.5%, volume 43L, studio size 350*350*350mm, studio material high-strength carbon Steel plate, shelves (standard configuration) 2pcs, maximum number of shelves 9pcs, maximum load of a single shelf 15kg, timing range 0~9999 minutes (with timing waiting function), power supply voltage AC220V/5.5A 50/60Hz, input power 1.2KW , Dimensions 630*463*570mm, net weight 33kg, outer box material cold-rolled steel plate, surface chemical resistance coating, thermal insulation material aluminum silicate fiber, heater stainless steel heating tube, exhaust port inner diameter 28mm*1, top Set the test hole, the thermostat digital tube double-column PID, the temperature setting method is set by touching four buttons, the temperature display method is measured temperature display: 4-digit digital upper display; set temperature display: 4-digit digital lower display, running function Fixed value operation, timing operation, automatic stop, program mode selection, additional function deviation correction, menu key lock, power failure compensation, power failure memory, temperature sensor pt100, outer packaging size 778*598*740mm, partition spacing 25mm, gross weight 37kg , safety device overheating alarm
General laboratory equipment - mixing and dispersing
	Bant MS300 Heating Magnetic Stirrer
	Specification parameters: maximum stirring volume 2L, stirring speed 0~1250rpm, temperature control range RT+~300℃, timing range 0~999min, working disc size 135*135mm, working disc material stainless steel, external dimension 230*180*120mm, power supply AC 220V/50Hz, the weight of the whole machine is 2.2kg, optional accessories TP-100P temperature probe, magnetic stirring rod, the overall size is 310*210*185mm, the package weight is 2kg
General Laboratory Equipment - Quality
	Jinghai FA2004N (external school) electronic analytical balance
	Specification parameters: weighing range 0~200g, minimum weighing value 0.1mg, repeatability error 0.0001g, weighing pan size Φ80mm, power supply voltage 220V 50Hz, packaging size 356*330*215mm, data interface RS232C, linearity error 0.0002g, Working temperature 0~40℃, maximum weighing 200g
General Laboratory Equipment - Electrochemistry
	Orion DDS-307 Digital Conductivity Meter
	Specification parameters: measurement parameter conductivity, measurement range 0~2X100000μs/cm, measurement error ±1% FS, temperature compensation range 15~35℃, cell constant specifications 0.01, 0.1, 1, 10, record output (0~20) mV , power consumption 5W